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Overview documentation for the Crypto library

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This commit is contained in:
Rhys Weatherley
2015-01-04 06:08:11 +10:00
parent ad858d7419
commit 9fe7854d0f
3 changed files with 120 additions and 0 deletions
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42
libraries/Crypto/examples/TestChaCha/TestChaCha.ino
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@@ -291,6 +291,39 @@ void testCipher(ChaCha *cipher, const struct TestVector *test)
Serial.println("Failed");
}
// The data space of this sketch is too big if we try to test the
// performance of all of setKey(), encrypt(), and decrypt().
// Since decryption is almost identical to encryption, only test
// that if the PERF_DECRYPT option is enabled, suppressing setKey().
//#define PERF_DECRYPT 1
#if !defined(PERF_DECRYPT)
void perfCipherSetKey(ChaCha *cipher, const struct TestVector *test)
{
unsigned long start;
unsigned long elapsed;
int count;
Serial.print(test->name);
Serial.print(" SetKey ... ");
cipher->setNumRounds(test->rounds);
start = micros();
for (count = 0; count < 1000; ++count) {
cipher->setKey(test->key, test->keySize);
cipher->setIV(test->iv, 8);
}
elapsed = micros() - start;
Serial.print(elapsed / 1000.0);
Serial.print("us per operation, ");
Serial.print((1000.0 * 1000000.0) / elapsed);
Serial.println(" per second");
}
#endif
void perfCipherEncrypt(ChaCha *cipher, const struct TestVector *test)
{
unsigned long start;
@@ -315,6 +348,8 @@ void perfCipherEncrypt(ChaCha *cipher, const struct TestVector *test)
Serial.println(" bytes per second");
}
#if defined(PERF_DECRYPT)
void perfCipherDecrypt(ChaCha *cipher, const struct TestVector *test)
{
unsigned long start;
@@ -339,10 +374,17 @@ void perfCipherDecrypt(ChaCha *cipher, const struct TestVector *test)
Serial.println(" bytes per second");
}
#endif
void perfCipher(ChaCha *cipher, const struct TestVector *test)
{
#if !defined(PERF_DECRYPT)
perfCipherSetKey(cipher, test);
perfCipherEncrypt(cipher, test);
#else
perfCipherEncrypt(cipher, test);
perfCipherDecrypt(cipher, test);
#endif
}
void setup()