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Crypto: ChaChaCore microoptimizations

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and some indent fixes
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zzz
2024-11-07 11:14:01 -05:00
parent 29d131827a
commit c7d15eb6d1
1 changed files with 22 additions and 23 deletions
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23
core/java/src/com/southernstorm/noise/crypto/chacha20/ChaChaCore.java
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@ -65,9 +65,10 @@ public final class ChaChaCore {
}
// Add the input block to the output.
for (index = 0; index < 16; ++index)
for (index = 0; index < 16; ++index) {
output[index] += input[index];
}
}
private static int char4(char c1, char c2, char c3, char c4)
{
@ -192,23 +193,21 @@ public final class ChaChaCore {
int value;
while (length >= 4) {
value = block[posn++];
output[outputOffset] = (byte)(input[inputOffset] ^ value);
output[outputOffset + 1] = (byte)(input[inputOffset + 1] ^ (value >> 8));
output[outputOffset + 2] = (byte)(input[inputOffset + 2] ^ (value >> 16));
output[outputOffset + 3] = (byte)(input[inputOffset + 3] ^ (value >> 24));
inputOffset += 4;
outputOffset += 4;
output[outputOffset++] = (byte)(input[inputOffset++] ^ value);
output[outputOffset++] = (byte)(input[inputOffset++] ^ (value >> 8));
output[outputOffset++] = (byte)(input[inputOffset++] ^ (value >> 16));
output[outputOffset++] = (byte)(input[inputOffset++] ^ (value >> 24));
length -= 4;
}
if (length == 3) {
value = block[posn];
output[outputOffset] = (byte)(input[inputOffset] ^ value);
output[outputOffset + 1] = (byte)(input[inputOffset + 1] ^ (value >> 8));
output[outputOffset + 2] = (byte)(input[inputOffset + 2] ^ (value >> 16));
output[outputOffset++] = (byte)(input[inputOffset++] ^ value);
output[outputOffset++] = (byte)(input[inputOffset++] ^ (value >> 8));
output[outputOffset] = (byte)(input[inputOffset] ^ (value >> 16));
} else if (length == 2) {
value = block[posn];
output[outputOffset] = (byte)(input[inputOffset] ^ value);
output[outputOffset + 1] = (byte)(input[inputOffset + 1] ^ (value >> 8));
output[outputOffset++] = (byte)(input[inputOffset++] ^ value);
output[outputOffset] = (byte)(input[inputOffset] ^ (value >> 8));
} else if (length == 1) {
value = block[posn];
output[outputOffset] = (byte)(input[inputOffset] ^ value);