1.8.6
diff --git a/AES192_8cpp_source.html b/AES192_8cpp_source.html
index 888f835e..073abea7 100644
--- a/AES192_8cpp_source.html
+++ b/AES192_8cpp_source.html
@@ -175,7 +175,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/AES256_8cpp_source.html b/AES256_8cpp_source.html
index f3c48fbc..6bf10a6f 100644
--- a/AES256_8cpp_source.html
+++ b/AES256_8cpp_source.html
@@ -182,7 +182,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/AESCommon_8cpp_source.html b/AESCommon_8cpp_source.html
index 102f2b8a..666bd4cd 100644
--- a/AESCommon_8cpp_source.html
+++ b/AESCommon_8cpp_source.html
@@ -415,7 +415,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/AES_8h_source.html b/AES_8h_source.html
index ad4108de..a58e252c 100644
--- a/AES_8h_source.html
+++ b/AES_8h_source.html
@@ -206,7 +206,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/BLAKE2b_8cpp_source.html b/BLAKE2b_8cpp_source.html
index f15f0bf4..ba7bf664 100644
--- a/BLAKE2b_8cpp_source.html
+++ b/BLAKE2b_8cpp_source.html
@@ -308,7 +308,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/BLAKE2b_8h_source.html b/BLAKE2b_8h_source.html
index cdb59400..27596d60 100644
--- a/BLAKE2b_8h_source.html
+++ b/BLAKE2b_8h_source.html
@@ -158,7 +158,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/BLAKE2s_8cpp_source.html b/BLAKE2s_8cpp_source.html
index 245879f4..7c42b8ef 100644
--- a/BLAKE2s_8cpp_source.html
+++ b/BLAKE2s_8cpp_source.html
@@ -300,7 +300,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/BLAKE2s_8h_source.html b/BLAKE2s_8h_source.html
index 637db3bf..969a376f 100644
--- a/BLAKE2s_8h_source.html
+++ b/BLAKE2s_8h_source.html
@@ -157,7 +157,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/Bitmap_8cpp_source.html b/Bitmap_8cpp_source.html
index 86c4ad76..95420349 100644
--- a/Bitmap_8cpp_source.html
+++ b/Bitmap_8cpp_source.html
@@ -694,7 +694,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/Bitmap_8h_source.html b/Bitmap_8h_source.html
index 67454c57..5e0a5ea6 100644
--- a/Bitmap_8h_source.html
+++ b/Bitmap_8h_source.html
@@ -271,7 +271,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/BlinkLED_8cpp_source.html b/BlinkLED_8cpp_source.html
index b3347b94..60101433 100644
--- a/BlinkLED_8cpp_source.html
+++ b/BlinkLED_8cpp_source.html
@@ -196,7 +196,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/BlinkLED_8h_source.html b/BlinkLED_8h_source.html
index f68a9b03..9cdd4975 100644
--- a/BlinkLED_8h_source.html
+++ b/BlinkLED_8h_source.html
@@ -157,7 +157,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/BlockCipher_8cpp_source.html b/BlockCipher_8cpp_source.html
index 60f89a6e..5233dbac 100644
--- a/BlockCipher_8cpp_source.html
+++ b/BlockCipher_8cpp_source.html
@@ -125,7 +125,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/BlockCipher_8h_source.html b/BlockCipher_8h_source.html
index d787e115..c24614b0 100644
--- a/BlockCipher_8h_source.html
+++ b/BlockCipher_8h_source.html
@@ -146,7 +146,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/BoolField_8cpp_source.html b/BoolField_8cpp_source.html
index 65c72120..a608ca5e 100644
--- a/BoolField_8cpp_source.html
+++ b/BoolField_8cpp_source.html
@@ -202,7 +202,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/BoolField_8h_source.html b/BoolField_8h_source.html
index 2faa79c4..11589674 100644
--- a/BoolField_8h_source.html
+++ b/BoolField_8h_source.html
@@ -160,7 +160,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/CBC_8cpp_source.html b/CBC_8cpp_source.html
index 1491ccc9..25835312 100644
--- a/CBC_8cpp_source.html
+++ b/CBC_8cpp_source.html
@@ -208,7 +208,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/CBC_8h_source.html b/CBC_8h_source.html
index 4aa2fde9..80b63bad 100644
--- a/CBC_8h_source.html
+++ b/CBC_8h_source.html
@@ -172,7 +172,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/CFB_8cpp_source.html b/CFB_8cpp_source.html
index fac0cd51..f1594d61 100644
--- a/CFB_8cpp_source.html
+++ b/CFB_8cpp_source.html
@@ -233,7 +233,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/CFB_8h_source.html b/CFB_8h_source.html
index f8b58d01..c03cdf59 100644
--- a/CFB_8h_source.html
+++ b/CFB_8h_source.html
@@ -171,7 +171,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/CTR_8cpp_source.html b/CTR_8cpp_source.html
index 8a2aa7ae..1a1ad9ae 100644
--- a/CTR_8cpp_source.html
+++ b/CTR_8cpp_source.html
@@ -228,7 +228,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/CTR_8h_source.html b/CTR_8h_source.html
index bd688730..f78dba4e 100644
--- a/CTR_8h_source.html
+++ b/CTR_8h_source.html
@@ -175,7 +175,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/ChaCha_8cpp_source.html b/ChaCha_8cpp_source.html
index d802704f..9253ccde 100644
--- a/ChaCha_8cpp_source.html
+++ b/ChaCha_8cpp_source.html
@@ -300,7 +300,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/ChaCha_8h_source.html b/ChaCha_8h_source.html
index bdf32b9b..68dd98d9 100644
--- a/ChaCha_8h_source.html
+++ b/ChaCha_8h_source.html
@@ -163,7 +163,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/Charlieplex_8cpp_source.html b/Charlieplex_8cpp_source.html
index e3efb326..dcdb2810 100644
--- a/Charlieplex_8cpp_source.html
+++ b/Charlieplex_8cpp_source.html
@@ -232,7 +232,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/Charlieplex_8h_source.html b/Charlieplex_8h_source.html
index fb06ef9b..5a22cbce 100644
--- a/Charlieplex_8h_source.html
+++ b/Charlieplex_8h_source.html
@@ -162,7 +162,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/ChaseLEDs_8cpp_source.html b/ChaseLEDs_8cpp_source.html
index 86a4ff2b..16366eb0 100644
--- a/ChaseLEDs_8cpp_source.html
+++ b/ChaseLEDs_8cpp_source.html
@@ -160,7 +160,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/ChaseLEDs_8h_source.html b/ChaseLEDs_8h_source.html
index e88e6927..4a1e4d2d 100644
--- a/ChaseLEDs_8h_source.html
+++ b/ChaseLEDs_8h_source.html
@@ -149,7 +149,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/Cipher_8cpp_source.html b/Cipher_8cpp_source.html
index 5bea2fd0..90a0aacd 100644
--- a/Cipher_8cpp_source.html
+++ b/Cipher_8cpp_source.html
@@ -125,7 +125,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/Cipher_8h_source.html b/Cipher_8h_source.html
index 26b150c5..64e5858e 100644
--- a/Cipher_8h_source.html
+++ b/Cipher_8h_source.html
@@ -148,7 +148,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/Crypto_8cpp_source.html b/Crypto_8cpp_source.html
index 0e93fde8..2ea64301 100644
--- a/Crypto_8cpp_source.html
+++ b/Crypto_8cpp_source.html
@@ -127,7 +127,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/Crypto_8h_source.html b/Crypto_8h_source.html
index fcff9631..7f40f85d 100644
--- a/Crypto_8h_source.html
+++ b/Crypto_8h_source.html
@@ -128,7 +128,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/Curve25519_8cpp_source.html b/Curve25519_8cpp_source.html
index e13bc3b9..c53a53dd 100644
--- a/Curve25519_8cpp_source.html
+++ b/Curve25519_8cpp_source.html
@@ -717,7 +717,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/Curve25519_8h_source.html b/Curve25519_8h_source.html
index 2db152bd..c4bcedb6 100644
--- a/Curve25519_8h_source.html
+++ b/Curve25519_8h_source.html
@@ -188,7 +188,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/DMD_8cpp_source.html b/DMD_8cpp_source.html
index 261e7faf..e16b128c 100644
--- a/DMD_8cpp_source.html
+++ b/DMD_8cpp_source.html
@@ -456,7 +456,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/DMD_8h_source.html b/DMD_8h_source.html
index c1ffea8c..17167213 100644
--- a/DMD_8h_source.html
+++ b/DMD_8h_source.html
@@ -170,7 +170,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/DS1307RTC_8cpp_source.html b/DS1307RTC_8cpp_source.html
index 1e98bd65..164c84bf 100644
--- a/DS1307RTC_8cpp_source.html
+++ b/DS1307RTC_8cpp_source.html
@@ -415,7 +415,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/DS1307RTC_8h_source.html b/DS1307RTC_8h_source.html
index 83309edd..4b9fc498 100644
--- a/DS1307RTC_8h_source.html
+++ b/DS1307RTC_8h_source.html
@@ -172,7 +172,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/DS3232RTC_8cpp_source.html b/DS3232RTC_8cpp_source.html
index 83fb083c..66ce0a1e 100644
--- a/DS3232RTC_8cpp_source.html
+++ b/DS3232RTC_8cpp_source.html
@@ -575,7 +575,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/DS3232RTC_8h_source.html b/DS3232RTC_8h_source.html
index dace665f..6f82f896 100644
--- a/DS3232RTC_8h_source.html
+++ b/DS3232RTC_8h_source.html
@@ -190,7 +190,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/DejaVuSans9_8h_source.html b/DejaVuSans9_8h_source.html
index 32cced0a..c48dcacd 100644
--- a/DejaVuSans9_8h_source.html
+++ b/DejaVuSans9_8h_source.html
@@ -257,7 +257,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/DejaVuSansBold9_8h_source.html b/DejaVuSansBold9_8h_source.html
index c10bf507..e56b0074 100644
--- a/DejaVuSansBold9_8h_source.html
+++ b/DejaVuSansBold9_8h_source.html
@@ -257,7 +257,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/DejaVuSansItalic9_8h_source.html b/DejaVuSansItalic9_8h_source.html
index c122831a..a0a74483 100644
--- a/DejaVuSansItalic9_8h_source.html
+++ b/DejaVuSansItalic9_8h_source.html
@@ -257,7 +257,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/EEPROM24_8cpp_source.html b/EEPROM24_8cpp_source.html
index a061d0c6..591ee0ac 100644
--- a/EEPROM24_8cpp_source.html
+++ b/EEPROM24_8cpp_source.html
@@ -282,7 +282,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/EEPROM24_8h_source.html b/EEPROM24_8h_source.html
index 6e8d71da..bb62e351 100644
--- a/EEPROM24_8h_source.html
+++ b/EEPROM24_8h_source.html
@@ -186,7 +186,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/Field_8cpp_source.html b/Field_8cpp_source.html
index d32dd103..f4dbee7e 100644
--- a/Field_8cpp_source.html
+++ b/Field_8cpp_source.html
@@ -196,7 +196,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/Field_8h_source.html b/Field_8h_source.html
index f9eeb4e7..ec2f81a6 100644
--- a/Field_8h_source.html
+++ b/Field_8h_source.html
@@ -164,7 +164,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/Form_8cpp_source.html b/Form_8cpp_source.html
index 47c0422e..cdd45397 100644
--- a/Form_8cpp_source.html
+++ b/Form_8cpp_source.html
@@ -278,7 +278,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/Form_8h_source.html b/Form_8h_source.html
index 6f647c95..30b60d6d 100644
--- a/Form_8h_source.html
+++ b/Form_8h_source.html
@@ -172,7 +172,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/Hash_8cpp_source.html b/Hash_8cpp_source.html
index 4ca4c053..c24661e4 100644
--- a/Hash_8cpp_source.html
+++ b/Hash_8cpp_source.html
@@ -125,7 +125,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/Hash_8h_source.html b/Hash_8h_source.html
index 44436b09..754247e7 100644
--- a/Hash_8h_source.html
+++ b/Hash_8h_source.html
@@ -145,7 +145,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/I2CMaster_8cpp_source.html b/I2CMaster_8cpp_source.html
index ada39857..770d0901 100644
--- a/I2CMaster_8cpp_source.html
+++ b/I2CMaster_8cpp_source.html
@@ -115,7 +115,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/I2CMaster_8h_source.html b/I2CMaster_8h_source.html
index 9c0bfc5b..b4b5d502 100644
--- a/I2CMaster_8h_source.html
+++ b/I2CMaster_8h_source.html
@@ -140,7 +140,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/IRreceiver_8cpp_source.html b/IRreceiver_8cpp_source.html
index fa2a84cc..47b61afb 100644
--- a/IRreceiver_8cpp_source.html
+++ b/IRreceiver_8cpp_source.html
@@ -261,7 +261,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/IRreceiver_8h_source.html b/IRreceiver_8h_source.html
index 9ad0a8a2..3bb9a0d9 100644
--- a/IRreceiver_8h_source.html
+++ b/IRreceiver_8h_source.html
@@ -157,7 +157,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/IntField_8cpp_source.html b/IntField_8cpp_source.html
index 21fe0878..2f0d6392 100644
--- a/IntField_8cpp_source.html
+++ b/IntField_8cpp_source.html
@@ -208,7 +208,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/IntField_8h_source.html b/IntField_8h_source.html
index 2fe4a72a..625ac57e 100644
--- a/IntField_8h_source.html
+++ b/IntField_8h_source.html
@@ -173,7 +173,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/KeccakCore_8cpp_source.html b/KeccakCore_8cpp_source.html
index d266b429..e697d1c8 100644
--- a/KeccakCore_8cpp_source.html
+++ b/KeccakCore_8cpp_source.html
@@ -334,7 +334,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/KeccakCore_8h_source.html b/KeccakCore_8h_source.html
index f46e28da..ad3ad9fd 100644
--- a/KeccakCore_8h_source.html
+++ b/KeccakCore_8h_source.html
@@ -163,7 +163,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/LCD_8cpp_source.html b/LCD_8cpp_source.html
index 5f6105dd..76d23dac 100644
--- a/LCD_8cpp_source.html
+++ b/LCD_8cpp_source.html
@@ -290,7 +290,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/LCD_8h_source.html b/LCD_8h_source.html
index a1e5d000..484d3c8f 100644
--- a/LCD_8h_source.html
+++ b/LCD_8h_source.html
@@ -201,7 +201,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/ListField_8cpp_source.html b/ListField_8cpp_source.html
index 496fe971..5377aa13 100644
--- a/ListField_8cpp_source.html
+++ b/ListField_8cpp_source.html
@@ -221,7 +221,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/ListField_8h_source.html b/ListField_8h_source.html
index 6ec3d173..c52cb556 100644
--- a/ListField_8h_source.html
+++ b/ListField_8h_source.html
@@ -159,7 +159,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/Melody_8cpp_source.html b/Melody_8cpp_source.html
index 9917f3f4..514cac3e 100644
--- a/Melody_8cpp_source.html
+++ b/Melody_8cpp_source.html
@@ -215,7 +215,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/Melody_8h_source.html b/Melody_8h_source.html
index 42a48c9c..c8f47f43 100644
--- a/Melody_8h_source.html
+++ b/Melody_8h_source.html
@@ -258,7 +258,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/Mono5x7_8h_source.html b/Mono5x7_8h_source.html
index b0ff658c..3e1abb02 100644
--- a/Mono5x7_8h_source.html
+++ b/Mono5x7_8h_source.html
@@ -246,7 +246,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/NoiseSource_8cpp_source.html b/NoiseSource_8cpp_source.html
index 7117ea50..5a460460 100644
--- a/NoiseSource_8cpp_source.html
+++ b/NoiseSource_8cpp_source.html
@@ -132,7 +132,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/NoiseSource_8h_source.html b/NoiseSource_8h_source.html
index fc1c270a..9bd6b645 100644
--- a/NoiseSource_8h_source.html
+++ b/NoiseSource_8h_source.html
@@ -139,7 +139,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/OFB_8cpp_source.html b/OFB_8cpp_source.html
index 79d52669..bc749183 100644
--- a/OFB_8cpp_source.html
+++ b/OFB_8cpp_source.html
@@ -206,7 +206,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/OFB_8h_source.html b/OFB_8h_source.html
index 9fa3266b..ae497a9a 100644
--- a/OFB_8h_source.html
+++ b/OFB_8h_source.html
@@ -171,7 +171,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/PowerSave_8cpp_source.html b/PowerSave_8cpp_source.html
index f7e1ca50..0aa22da0 100644
--- a/PowerSave_8cpp_source.html
+++ b/PowerSave_8cpp_source.html
@@ -155,7 +155,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/PowerSave_8h_source.html b/PowerSave_8h_source.html
index 637fef14..a60bc456 100644
--- a/PowerSave_8h_source.html
+++ b/PowerSave_8h_source.html
@@ -158,7 +158,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/RC5_8h_source.html b/RC5_8h_source.html
index 77cc2529..5856c56c 100644
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1.8.6
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1.8.6
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+++ b/classDS3232RTC-members.html
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1.8.6
diff --git a/classDS3232RTC.html b/classDS3232RTC.html
index 5e78bb2f..439e3744 100644
--- a/classDS3232RTC.html
+++ b/classDS3232RTC.html
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1.8.6
diff --git a/classEEPROM24-members.html b/classEEPROM24-members.html
index 3c291a28..a0bb0d5e 100644
--- a/classEEPROM24-members.html
+++ b/classEEPROM24-members.html
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1.8.6
diff --git a/classEEPROM24.html b/classEEPROM24.html
index 555e1e4e..5ec3ecbe 100644
--- a/classEEPROM24.html
+++ b/classEEPROM24.html
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1.8.6
diff --git a/classField-members.html b/classField-members.html
index dc0645a0..9e330222 100644
--- a/classField-members.html
+++ b/classField-members.html
@@ -106,7 +106,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/classField.html b/classField.html
index a682841d..55d70000 100644
--- a/classField.html
+++ b/classField.html
@@ -424,7 +424,7 @@ class
1.8.6
diff --git a/classForm-members.html b/classForm-members.html
index afb7a9bc..d3fbaa59 100644
--- a/classForm-members.html
+++ b/classForm-members.html
@@ -108,7 +108,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/classForm.html b/classForm.html
index 3c446ac8..72aad5d8 100644
--- a/classForm.html
+++ b/classForm.html
@@ -485,7 +485,7 @@ class
1.8.6
diff --git a/classHash-members.html b/classHash-members.html
index 6475adb7..246205e0 100644
--- a/classHash-members.html
+++ b/classHash-members.html
@@ -101,7 +101,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/classHash.html b/classHash.html
index 8cb5e253..855ec0a4 100644
--- a/classHash.html
+++ b/classHash.html
@@ -389,7 +389,7 @@ Public Member Functions
1.8.6
diff --git a/classI2CMaster-members.html b/classI2CMaster-members.html
index f7b51261..5d4919f0 100644
--- a/classI2CMaster-members.html
+++ b/classI2CMaster-members.html
@@ -100,7 +100,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/classI2CMaster.html b/classI2CMaster.html
index 273717a6..e7e43576 100644
--- a/classI2CMaster.html
+++ b/classI2CMaster.html
@@ -328,7 +328,7 @@ virtual unsigned int
1.8.6
diff --git a/classIRreceiver-members.html b/classIRreceiver-members.html
index ad2506ea..723d3f92 100644
--- a/classIRreceiver-members.html
+++ b/classIRreceiver-members.html
@@ -100,7 +100,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/classIRreceiver.html b/classIRreceiver.html
index eff78d7f..66f3ac09 100644
--- a/classIRreceiver.html
+++ b/classIRreceiver.html
@@ -328,7 +328,7 @@ void
1.8.6
diff --git a/classIntField-members.html b/classIntField-members.html
index d4a4ceed..ffeb89ba 100644
--- a/classIntField-members.html
+++ b/classIntField-members.html
@@ -118,7 +118,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/classIntField.html b/classIntField.html
index 24ddf26f..e873fce3 100644
--- a/classIntField.html
+++ b/classIntField.html
@@ -647,7 +647,7 @@ LiquidCrystal *
1.8.6
diff --git a/classKeccakCore-members.html b/classKeccakCore-members.html
index aab23f6d..bc6da467 100644
--- a/classKeccakCore-members.html
+++ b/classKeccakCore-members.html
@@ -107,7 +107,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/classKeccakCore.html b/classKeccakCore.html
index fe91b78d..3960d19e 100644
--- a/classKeccakCore.html
+++ b/classKeccakCore.html
@@ -370,7 +370,7 @@ void
1.8.6
diff --git a/classLCD-members.html b/classLCD-members.html
index 6925d2b8..7100f2be 100644
--- a/classLCD-members.html
+++ b/classLCD-members.html
@@ -110,7 +110,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/classLCD.html b/classLCD.html
index 04f8dc49..9cf7d268 100644
--- a/classLCD.html
+++ b/classLCD.html
@@ -528,7 +528,7 @@ Support for DFRobot LCD Shield
1.8.6
diff --git a/classListField-members.html b/classListField-members.html
index e0f3df34..5716eb43 100644
--- a/classListField-members.html
+++ b/classListField-members.html
@@ -111,7 +111,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/classListField.html b/classListField.html
index e82ced3f..08ae4035 100644
--- a/classListField.html
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@@ -411,7 +411,7 @@ LiquidCrystal *
1.8.6
diff --git a/classMelody-members.html b/classMelody-members.html
index a1e593be..4d02f363 100644
--- a/classMelody-members.html
+++ b/classMelody-members.html
@@ -103,7 +103,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/classMelody.html b/classMelody.html
index e8224cd5..8352158a 100644
--- a/classMelody.html
+++ b/classMelody.html
@@ -371,7 +371,7 @@ bool
1.8.6
diff --git a/classNoiseSource-members.html b/classNoiseSource-members.html
index 10c19f78..36c1df58 100644
--- a/classNoiseSource-members.html
+++ b/classNoiseSource-members.html
@@ -98,7 +98,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/classNoiseSource.html b/classNoiseSource.html
index 35cbf4eb..e1b0f804 100644
--- a/classNoiseSource.html
+++ b/classNoiseSource.html
@@ -102,7 +102,8 @@ Inheritance diagram for NoiseSource:
1.8.6
diff --git a/classOFB.html b/classOFB.html
index 76ddb4c1..b900aa3e 100644
--- a/classOFB.html
+++ b/classOFB.html
@@ -181,7 +181,7 @@ class OFB< T >
1.8.6
diff --git a/classOFBCommon-members.html b/classOFBCommon-members.html
index f33b5a5e..27223c02 100644
--- a/classOFBCommon-members.html
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1.8.6
diff --git a/classOFBCommon.html b/classOFBCommon.html
index 423fd7fe..e77d2016 100644
--- a/classOFBCommon.html
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@@ -534,7 +534,7 @@ Protected Member Functions
1.8.6
diff --git a/classRNGClass-members.html b/classRNGClass-members.html
index 5334223f..91b65af0 100644
--- a/classRNGClass-members.html
+++ b/classRNGClass-members.html
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1.8.6
diff --git a/classRNGClass.html b/classRNGClass.html
index d6703414..d28d30c3 100644
--- a/classRNGClass.html
+++ b/classRNGClass.html
@@ -516,7 +516,7 @@ static const int
1.8.6
diff --git a/classRTC-members.html b/classRTC-members.html
index 4478d84f..3bdd2d46 100644
--- a/classRTC-members.html
+++ b/classRTC-members.html
@@ -123,7 +123,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/classRTC.html b/classRTC.html
index d33062ec..1e8c9b01 100644
--- a/classRTC.html
+++ b/classRTC.html
@@ -778,7 +778,7 @@ static const uint8_t
1.8.6
diff --git a/classRTCAlarm-members.html b/classRTCAlarm-members.html
index 5600b9d3..a47e1c96 100644
--- a/classRTCAlarm-members.html
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1.8.6
diff --git a/classRTCDate-members.html b/classRTCDate-members.html
index 05f6ed68..6fe4168c 100644
--- a/classRTCDate-members.html
+++ b/classRTCDate-members.html
@@ -96,7 +96,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/classRTCTime-members.html b/classRTCTime-members.html
index 8028896a..99afaffd 100644
--- a/classRTCTime-members.html
+++ b/classRTCTime-members.html
@@ -96,7 +96,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/classRingOscillatorNoiseSource-members.html b/classRingOscillatorNoiseSource-members.html
new file mode 100644
index 00000000..90c2bed3
--- /dev/null
+++ b/classRingOscillatorNoiseSource-members.html
@@ -0,0 +1,108 @@
+
+
+
+
+
+
+|
+ ArduinoLibs
+
+ |
+
+
+
+
+
+ This is the complete list of members for RingOscillatorNoiseSource, including all inherited members.
+| calibrating() const | RingOscillatorNoiseSource | virtual |
| NoiseSource() | NoiseSource | |
| output(const uint8_t *data, size_t len, unsigned int credit) | NoiseSource | protectedvirtual |
| RingOscillatorNoiseSource() (defined in RingOscillatorNoiseSource) | RingOscillatorNoiseSource | |
| stir() | RingOscillatorNoiseSource | virtual |
| ~NoiseSource() | NoiseSource | virtual |
| ~RingOscillatorNoiseSource() (defined in RingOscillatorNoiseSource) | RingOscillatorNoiseSource | virtual |
+ 1.8.6
+
+
+
diff --git a/classRingOscillatorNoiseSource.html b/classRingOscillatorNoiseSource.html
new file mode 100644
index 00000000..3a587bda
--- /dev/null
+++ b/classRingOscillatorNoiseSource.html
@@ -0,0 +1,258 @@
+
+
+
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+
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+|
+ ArduinoLibs
+
+ |
+
+
+
+
+
+ Processes the signal from a ring oscillator based noise source. + More...
+ +#include <RingOscillatorNoiseSource.h>
+
+ +Public Member Functions | |
| bool | calibrating () const |
| Determine if the noise source is still calibrating itself. More... | |
| void | stir () |
| Stirs entropy from this noise source into the global random number pool. More... | |
 Public Member Functions inherited from NoiseSource | |
| + | NoiseSource () |
| Constructs a new random noise source. | |
| +virtual | ~NoiseSource () |
| Destroys this random noise source. | |
+Additional Inherited Members | |
| Protected Member Functions inherited from NoiseSource | |
| virtual void | output (const uint8_t *data, size_t len, unsigned int credit) |
| Called from subclasses to output noise to the global random number pool. More... | |
Processes the signal from a ring oscillator based noise source.
+This class processes input from a ring oscillator noise source, such as that described here.
+The noise is read from an input capture pin on the Arduino and stirred into the random number pool on a regular basis. The following pins are used on different Arduino variants:
+| Variant | Arduino Pin / AVR Pin | Timer |
| Arduino Uno | D8 / PB0 | Timer 1 |
| Arduino Leonardo | D4 / PD4 | Timer 1 |
| Arduino Mega or Mega 2560 | D49 / PL0 | Timer 4 |
If your board is not pin-compatible with one of the above, then the source for the RingOscillatorNoiseSource class will need to be modified to use a different pin/timer combination. Also, when the timer is in use by this class it cannot be used for other application tasks.
+The example below shows how to initialize a ring oscillator based noise source and use it with RNG:
+For more information, see the documentation for RNG.
+Definition at line 29 of file RingOscillatorNoiseSource.h.
+
+
|
+ +virtual | +
Determine if the noise source is still calibrating itself.
+Noise sources that require calibration start doing so at system startup and then switch over to random data generation once calibration is complete. Since no random data is being generated during calibration, the output from RNG.rand() may be predictable. Use RNG.available() to determine when sufficient entropy is available to generate good random values.
+It is possible that the noise source never exits calibration. This can happen if the input voltage is insufficient to trigger noise or if the noise source is not connected. Noise sources may also periodically recalibrate themselves.
+Implements NoiseSource.
+ +Definition at line 178 of file RingOscillatorNoiseSource.cpp.
+ +
+
|
+ +virtual | +
Stirs entropy from this noise source into the global random number pool.
+This function should call output() to add the entropy from this noise source to the global random number pool.
+The noise source should batch up the entropy data, providing between 16 and 48 bytes of data each time. If the noise source does not have sufficient entropy data at the moment, it should return without stiring the current data in.
+Implements NoiseSource.
+ +Definition at line 201 of file RingOscillatorNoiseSource.cpp.
+ +
+ 1.8.6
+
+
+
diff --git a/classRingOscillatorNoiseSource.png b/classRingOscillatorNoiseSource.png
new file mode 100644
index 00000000..138a6eb9
Binary files /dev/null and b/classRingOscillatorNoiseSource.png differ
diff --git a/classSHA1-members.html b/classSHA1-members.html
index c127be6e..93dc10ce 100644
--- a/classSHA1-members.html
+++ b/classSHA1-members.html
@@ -107,7 +107,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/classSHA1.html b/classSHA1.html
index c429671c..6ec612e7 100644
--- a/classSHA1.html
+++ b/classSHA1.html
@@ -375,7 +375,7 @@ virtual
1.8.6
diff --git a/classSHA256-members.html b/classSHA256-members.html
index 24263d83..e06a3bbe 100644
--- a/classSHA256-members.html
+++ b/classSHA256-members.html
@@ -107,7 +107,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/classSHA256.html b/classSHA256.html
index d28eae79..47d8eb76 100644
--- a/classSHA256.html
+++ b/classSHA256.html
@@ -375,7 +375,7 @@ virtual
1.8.6
diff --git a/classSHA3__256-members.html b/classSHA3__256-members.html
index c394a09a..93cc483d 100644
--- a/classSHA3__256-members.html
+++ b/classSHA3__256-members.html
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1.8.6
diff --git a/classSHA3__256.html b/classSHA3__256.html
index da6c29d7..20b074f9 100644
--- a/classSHA3__256.html
+++ b/classSHA3__256.html
@@ -375,7 +375,7 @@ virtual
1.8.6
diff --git a/classSHA3__512-members.html b/classSHA3__512-members.html
index edb0322a..c329e6e9 100644
--- a/classSHA3__512-members.html
+++ b/classSHA3__512-members.html
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1.8.6
diff --git a/classSHA3__512.html b/classSHA3__512.html
index 063bc552..823b4fa0 100644
--- a/classSHA3__512.html
+++ b/classSHA3__512.html
@@ -375,7 +375,7 @@ virtual
1.8.6
diff --git a/classSHA512-members.html b/classSHA512-members.html
index ef0ac72e..25c583e0 100644
--- a/classSHA512-members.html
+++ b/classSHA512-members.html
@@ -108,7 +108,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/classSHA512.html b/classSHA512.html
index 61efd699..e78e2a29 100644
--- a/classSHA512.html
+++ b/classSHA512.html
@@ -375,7 +375,7 @@ virtual
1.8.6
diff --git a/classSoftI2C-members.html b/classSoftI2C-members.html
index 89e78ab0..3842013f 100644
--- a/classSoftI2C-members.html
+++ b/classSoftI2C-members.html
@@ -101,7 +101,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/classSoftI2C.html b/classSoftI2C.html
index 1aa27cc7..be56e478 100644
--- a/classSoftI2C.html
+++ b/classSoftI2C.html
@@ -346,7 +346,7 @@ unsigned int
1.8.6
diff --git a/classTextField-members.html b/classTextField-members.html
index a0bde0cf..217cdf6c 100644
--- a/classTextField-members.html
+++ b/classTextField-members.html
@@ -109,7 +109,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/classTextField.html b/classTextField.html
index 1a31cd4b..ee73a91c 100644
--- a/classTextField.html
+++ b/classTextField.html
@@ -343,7 +343,7 @@ LiquidCrystal *
1.8.6
diff --git a/classTimeField-members.html b/classTimeField-members.html
index de9aa470..b344902e 100644
--- a/classTimeField-members.html
+++ b/classTimeField-members.html
@@ -113,7 +113,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/classTimeField.html b/classTimeField.html
index d159a3db..fc91c6ca 100644
--- a/classTimeField.html
+++ b/classTimeField.html
@@ -541,7 +541,7 @@ LiquidCrystal *
1.8.6
diff --git a/classTransistorNoiseSource-members.html b/classTransistorNoiseSource-members.html
index a0dd3093..433f8c9f 100644
--- a/classTransistorNoiseSource-members.html
+++ b/classTransistorNoiseSource-members.html
@@ -100,7 +100,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/classTransistorNoiseSource.html b/classTransistorNoiseSource.html
index ed1ba003..beb53b88 100644
--- a/classTransistorNoiseSource.html
+++ b/classTransistorNoiseSource.html
@@ -166,7 +166,7 @@ Additional Inherited MembersDefinition at line 29 of file TransistorNoiseSource.h.
1.8.6
diff --git a/classes.html b/classes.html
index 1cc68dc5..186b3ad1 100644
--- a/classes.html
+++ b/classes.html
@@ -91,37 +91,37 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/crypto-rng-ring_8dox.html b/crypto-rng-ring_8dox.html
new file mode 100644
index 00000000..7952825c
--- /dev/null
+++ b/crypto-rng-ring_8dox.html
@@ -0,0 +1,95 @@
+
+
+
+
+
+
+|
+ ArduinoLibs
+
+ |
+
+
+
+
+
+
+ 1.8.6
+
+
+
diff --git a/crypto-rng_8dox.html b/crypto-rng_8dox.html
new file mode 100644
index 00000000..5e1ec0cf
--- /dev/null
+++ b/crypto-rng_8dox.html
@@ -0,0 +1,95 @@
+
+
+
+
+
+
+|
+ ArduinoLibs
+
+ |
+
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+
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+ 1.8.6
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+
diff --git a/crypto.html b/crypto.html
index a5a7575e..79aa6fa4 100644
--- a/crypto.html
+++ b/crypto.html
@@ -87,11 +87,16 @@ Supported Algorithms
All cryptographic algorithms have been optimized for 8-bit Arduino platforms like the Uno. Memory usage is also reduced, particularly for SHA1, SHA256, and SHA512 which save 256, 192, and 512 bytes respectively over traditional implementations. For all algorithms, static sbox tables and the like are placed into program memory to further reduce data memory usage.
ChaCha with 20 rounds and 256-bit keys is the recommended symmetric encryption algorithm because it is twice as fast as AES128, constant-time, and much more secure. AES128, AES192, and AES256 are provided for use in applications where compatibility with other systems is desirable.
BLAKE2s and BLAKE2b are variations on the ChaCha stream cipher, designed for hashing, with 256-bit and 512-bit hash outputs respectively. They are intended as high performance replacements for SHA256 and SHA512 for when speed is critical but exact bit-compatibility of hash values is not.
+All figures are for the Arduino Uno running at 16 MHz. Figures for the Ardunino Mega 2560 running at 16 MHz are similar:
@@ -140,7 +145,7 @@ Performance
1.8.6
diff --git a/crypto_8dox.html b/crypto_8dox.html
index 9533567a..c1fa35d8 100644
--- a/crypto_8dox.html
+++ b/crypto_8dox.html
@@ -87,7 +87,7 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
1.8.6
diff --git a/crypto_rng.html b/crypto_rng.html
new file mode 100644
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--- /dev/null
+++ b/crypto_rng.html
@@ -0,0 +1,189 @@
+
+
+
+
+
+
+|
+ ArduinoLibs
+
+ |
+
+
+
+
+
+ Random numbers are one of the most important aspects of secure cryptography. Without a good source of random numbers it may be possible for an attacker to predict the encryption and authentication keys that are used to protect a session, or to predict the private component of a public/private key pair. This is especially difficult in embedded environments that do not have input sources like keystrokes, mouse movements, disk drive write times, etc to collect entropy from the user.
+This library provides the RNG class to manage the global random number pool. It has the following features:
+The whitening function and the PRNG are based on ChaCha::hashCore() with 20 rounds. The structure of the PRNG is very similar to OpenBSD's ChaCha20-based arc4random() implementation.
+The library provides two standard noise sources:
+The transistor design needs an input voltage of 10 to 15 VDC to trigger the avalanche effect, which can sometimes be difficult in a 5V Arduino environment. The ring oscillator design can run at 5V but the quality of the noise is less than for the transistor design. The RingOscillatorNoiseSource class attempts to make up for this by collecting more input bits for the same amount of output entropy. See this page for more information on ring oscillators.
+For both of the standard noise sources, the system should have enough entropy to safely generate 256 bits of key material about 3 to 4 seconds after startup. This is sufficient to create a private key for Curve25519 for example.
+If you are unsure which noise source to use, then I suggest TransistorNoiseSource as Rob's design has had more review. Another approach is to mix multiple noise sources together to get the best of both worlds.
+To use the random number generator, both RNG and a noise source must first be initialized. We start by including the necessary libraries:
+Next we create a global variable for the noise source and specify the I/O pin that the noise circuit is connected to:
+Then in the setup() function we call RNG.begin() to start the random number generator running:
+The begin() function is passed two arguments: a tag string that should be different for every application and an EEPROM address to use to load and save the random number seed. The tag string ensures that different applications and versions will generate different random numbers upon first boot before the noise source has collected any entropy. If the device also has a unique serial number or a MAC address, then those can be mixed in during the setup() function after calling begin():
+The random number generator needs 49 bytes of EEPROM space at the specified address to store the previous seed. When the system is started next time, the previous saved seed is loaded and then deliberately overwritten with a new seed. This ensures that the device will not accidentally generate the same sequence of random numbers if it is restarted before a new seed can be saved.
+By default the seed is saved once an hour, although this can be changed with RNG.setAutoSaveTime(). Because the device may be restarted before the first hour expires, there is a special case in the code: the first time that the entropy pool fills up, a save will be automatically forced.
+To use the random number generator properly, there are some regular tasks that must be performed every time around the application's main loop(). Newly accumulated noise must be mixed in with RNG.stir() and the RNG.loop() function must be called to perform auto-saves:
+The random number generator is now ready to generate data.
+Whenever the application needs random data, it calls RNG.rand() with a buffer to fill. The following example generates a 256-bit encryption key and a 128-bit initialization vector; e.g. for use with AES256 in CTR mode:
+The data will be generated immediately, using whatever entropy happens to be in the global random number pool at the time. In Linux terms, the rand() function acts like the /dev/urandom device.
If the system has been running for a while then this should be safe as the noise source would have already permuted the pool with noise-based entropy. However, when the system first starts up there may not be much entropy available other than that from the saved seed (which could have been compromised).
+In Linux terms we want the effect of the /dev/random device which blocks until sufficient entropy is available to service the request. Blocking isn't compatible with the Arduino way of doing things, so the library instead provides the RNG.available() function to poll how much entropy is in the global random number pool:
This feature should allow applications to generate secret material safely at startup. The application may want to implement a timeout: if the application has to wait too long to generate a key then the noise source may be disconnected or faulty.
+The global random number pool can hold up to 48 bytes, or 384 bits, of entropy. Requests for more than 384 bits will be allowed if the entropy is at maximum. That is, a request for 64 bytes (512 bits) of data will be allowed when there is only 384 bits of entropy in the pool. This behaviour prevents the application from waiting indefinitely if the request is too large.
+If the application truly needs more than 384 bits of real entropy (e.g. to generate a public/private key pair for an algorithm like RSA), then it should break the request up into smaller chunks and poll available() for each chunk.
+When the application is finished with the secret key material and plaintext, it should destroy the data to remove it from RAM permanently. The memset() function can be used for this purpose:
+However, this may not be safe. Optimizing compilers have been known to optimize away memset() calls if the compiler thinks that the value won't be used again. A safer method is to use the clean() function in the library:
+The clean() function attempts to implement the memory clear in a way that the compiler shouldn't optimize away. By default the clean() function figures out the size of the buffer itself at compile time. In some cases (e.g. buffers that are passed by pointer), it may be necessary to specify the size manually:
+
+ 1.8.6
+
+
+
diff --git a/crypto_rng_ring.html b/crypto_rng_ring.html
new file mode 100644
index 00000000..162dd90c
--- /dev/null
+++ b/crypto_rng_ring.html
@@ -0,0 +1,159 @@
+
+
+
+
+
+
+|
+ ArduinoLibs
+
+ |
+
+
+
+
+
+ This page discusses how to construct and use a noise source based on the jitter from a ring oscillator. The circuit here is very simple: more complex ring oscillator designs are possible and may give better results.
+A ring oscillator is formed out of an odd number of inverter gates. A 1 value on the input to the first gate will be inverted several times, resulting in a 0 value being fed back into the first gate. In turn that 0 is inverted several times to generate another 1. And so on. In schematic form, a 3-stage ring oscillator looks like this:
+
+Because electronic circuits are not instanteous devices it can take some time for the values to propagate down the inverter chain. The longer the chain (5-stage, 7-stage, 9-stage, or more) the longer the propagation delay. The important thing is that the delay is not fixed: differences in components, ambient temperature, and other factors combine to introduce a little bit of random jitter in the output waveform.
+For our purposes, the jitter is what we are after. The timing differences from one rising edge to the the next gives us the random bits.
+The triangular-shaped output from the final inverter isn't very friendly to microprocessors. So it is common to select out the jitter using a D flip-flop and a periodic clock signal:
+
+Practical designs inside CPU's often use multiple ring oscillators XOR'ed together:
+
+Even after all that the output won't be uniformly random. It is necessary to whiten the output with a secure hash function before using the data for cryptography. Fortunately for us, RNG.stir() has built-in support for whitening so we just need to collect the raw bits.
+To keep things simple, we are going to use a single 5-stage ring oscillator with a sampling clock provided by a 555 timer:
+
+The components were deliberately chosen to be commonly available. The only special one is the 555. I recommend using the CMOS LM7555 variant (or something equivalent) instead because it can operate at higher frequencies than a garden variety 555. The 56 ohm resistor on the output of U2 inhibits ringing on the clock line: we want the noise to come from U1 not U2.
+The frequency output from U1 will depend upon the properties of your 4069 chip. A cheap bargain bin chip is actually better than a high quality chip. Some inverter datasheets I have read proudly advertise reduced jitter but the jitter is what we are after here. My 4069 was generating about 1.7MHz with a 5-stage ring oscillator. Other chips I tried were able to exceed 12MHz with a 3-stage ring oscillator. Because the Arduino isn't fast enough to sample high frequency signals, lower is actually better for our needs.
+To further lower the frequency to something the Arduino can measure, the 555 timer should be set to between 100kHz and 200kHz (it's ok to be a little over 200kHz). Start with an R1 value of about 2.2K and adjust it up or down to get the frequency into the target range. Also measure the output frequency from U3A and try to target between 20kHz and 50kHz. The Arduino can easily sample that without putting too much burden on the CPU. The signal should be very jittery at this point.
+This design can of course be improved by using multiple ring oscillators and an XOR gate, but I wanted to keep the component count low for the basic design.
+The RingOscillatorNoiseSource class uses the input capture feature of the AVR microcontroller to measure the time between successive rising edges. Input capture is only possible on certain pins and the output of the circuit above needs to be connected to the correct pin:
+| Variant | Arduino Pin / AVR Pin | Timer |
| Arduino Uno | D8 / PB0 | Timer 1 |
| Arduino Leonardo | D4 / PD4 | Timer 1 |
| Arduino Mega or Mega 2560 | D49 / PL0 | Timer 4 |
If your board is not pin-compatible with one of the above, then the source for the RingOscillatorNoiseSource class will need to be modified to use a different pin/timer combination. Also, when the timer is in use by this class it cannot be used for other application tasks.
+The timer is set up in free-running mode to count as fast as possible. Whenever a rising edge occurs on the input signal, the timer's current value is written to a special register and an interrupt occurs. Within the interrupt service routine, the previous register value is subtracted from the current value to determine the amount of time that has elapsed between the two rising edges.
+The jitter is extracted from the time difference in a very simple way: the lowest bit of the difference is the jitter and all other bits are discarded. The interrupt service routine collects up 16 bits of jitter over successive input pulses and then passes them to the higher level code in the RingOscillatorNoiseSource class.
+Within the higher level code, the input bits are first debiased using the Von Neumann method to discard the parts of the signal that don't jitter very much:
+The debiased bits are collected up into a 256-bit buffer. Once the buffer is full it is passed to RNG.stir() to be whitened and incorporated into the global random number pool.
+And that's it!
+As noted earlier, the output from a ring oscillator is not uniform. To deal with this, the RingOscillatorNoiseSource class takes a fairly conservative approach. It credits a very small amount of entropy to each full buffer, forcing the system to collect more input data to achieve full entropy.
+My investigations showed that at 20kHz it takes about a second to generate 256 bits of good random data after Von Neumann debiasing and whitening. Two to three seconds after startup there should be enough entropy in the random number pool to generate encryption keys and other secret material safely. The RNG.available() function can be used to determine when there is enough entropy in the pool for the application's needs.
+
+ 1.8.6
+
+
+
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1.8.6
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index 59acde6f..7347f9ae 100644
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1.8.6
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1.8.6
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1.8.6
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@@ -160,32 +160,34 @@ var searchBox = new SearchBox("searchBox", "search",false,'Search');
PowerSave.cppPowerSave.hRC5.hRNG.cppRNG.hRTC.cppRTC.hSHA1.cppSHA1.hSHA256.cppSHA256.hSHA3.cppSHA3.hSHA512.cppSHA512.hSoftI2C.cppSoftI2C.hTextField.cppTextField.hTimeField.cppTimeField.hTransistorNoiseSource.cppTransistorNoiseSource.hRingOscillatorNoiseSource.cppRingOscillatorNoiseSource.hRNG.cppRNG.hRTC.cppRTC.hSHA1.cppSHA1.hSHA256.cppSHA256.hSHA3.cppSHA3.hSHA512.cppSHA512.hSoftI2C.cppSoftI2C.hTextField.cppTextField.hTimeField.cppTimeField.hTransistorNoiseSource.cppTransistorNoiseSource.h
1.8.6
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index ae808e1f..01fb991b 100644
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1.8.6
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index 93a832e5..d8f2fd8f 100644
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1.8.6
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1.8.6
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1.8.6
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1.8.6
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1.8.6
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1.8.6
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1.8.6
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1.8.6
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index b046c1cf..f9eaa96f 100644
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index 38c8d31d..6c2e51ff 100644
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LCDMelody
NoiseSourceTransistorNoiseSourceRNGClassRTCDS1307RTCDS3232RTCRTCAlarmRTCDateRTCTimeRingOscillatorNoiseSourceTransistorNoiseSourceRNGClassRTCDS1307RTCDS3232RTCRTCAlarmRTCDateRTCTime
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index 00ec80cd..78d499a0 100644
--- a/index.html
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index 0ce8d372..f4a9ecdf 100644
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index 769f6668..8fae45a2 100644
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index a03e27e9..fa1f32c1 100644
--- a/pages.html
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index bd5219d3..71b32c3b 100644
--- a/search/all_10.js
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index 9269d5d2..42fa73bb 100644
--- a/search/all_6.js
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@@ -1,4 +1,5 @@
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index ecdabb72..14b731e3 100644
--- a/search/all_f.js
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index 1c19d004..18aec76c 100644
--- a/search/classes_d.js
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index 6874eb94..104b08f0 100644
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index e94de98b..b6351d6b 100644
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1.8.6
diff --git a/structRTCTime.html b/structRTCTime.html
index 369b7855..376c0c67 100644
--- a/structRTCTime.html
+++ b/structRTCTime.html
@@ -123,7 +123,7 @@ uint8_t
1.8.6