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Ed25519 signature algorithm

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This commit is contained in:
Rhys Weatherley
2015-04-18 08:42:37 +10:00
parent a936aa3e4a
commit 786e52f923
13 changed files with 1672 additions and 127 deletions
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67
libraries/Crypto/examples/TestCurve25519Math/TestCurve25519Math.ino
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@@ -99,10 +99,10 @@ void printNumber(const char *name, const limb_t *x)
static const char hexchars[] = "0123456789ABCDEF";
Serial.print(name);
Serial.print(" = ");
for (uint8_t posn = 0; posn < NUM_LIMBS; ++posn) {
for (uint8_t posn = NUM_LIMBS; posn > 0; --posn) {
for (uint8_t bit = LIMB_BITS; bit > 0; ) {
bit -= 4;
Serial.print(hexchars[(x[posn] >> bit) & 0x0F]);
Serial.print(hexchars[(x[posn - 1] >> bit) & 0x0F]);
}
Serial.print(' ');
}
@@ -603,6 +603,68 @@ void testRecip()
Serial.println();
}
void testSqrt(const char *x)
{
Serial.print("sqrt(");
printProgMem(x);
Serial.print("^2): ");
Serial.flush();
fromString(arg1, NUM_LIMBS, x);
Curve25519::square(arg2, arg1);
bool ok = Curve25519::sqrt(result, arg2);
if (ok) {
ok = (compare(result, arg1) == 0);
if (!ok) {
// Check the negation of arg1 as well because we could
// have ended up with the inverse of the original value.
memset(temp, 0, sizeof(temp));
Curve25519::sub(temp, temp, arg1);
ok = (compare(result, temp) == 0);
}
} else {
Serial.println("no sqrt ... ");
}
if (ok) {
Serial.println("ok");
} else {
Serial.println("failed");
printNumber("actual", result);
printNumber("expected", arg1);
}
}
void testNoSqrt(const char *x)
{
Serial.print("no sqrt(");
printProgMem(x);
Serial.print("): ");
Serial.flush();
fromString(arg1, NUM_LIMBS, x);
bool ok = !Curve25519::sqrt(result, arg1);
if (ok) {
Serial.println("ok");
} else {
Serial.println("failed");
printNumber("actual", result);
}
}
void testSqrt()
{
Serial.println("Square root:");
foreach_number (x) {
testSqrt(x);
}
testNoSqrt(num_128);
testNoSqrt(num_pi);
Serial.println();
}
void setup()
{
Serial.begin(9600);
@@ -613,6 +675,7 @@ void setup()
testMulA24();
testSwap();
testRecip();
testSqrt();
}
void loop()