diff options
| author | Peter Dettman <peter.dettman@bouncycastle.org> | 2019-08-01 21:40:32 +0700 |
|---|---|---|
| committer | Peter Dettman <peter.dettman@bouncycastle.org> | 2019-08-01 21:40:32 +0700 |
| commit | d8d62524a8380844f995ebc6fd44174ea8fac97b (patch) | |
| tree | 024ffc44b394b8b1c98a37d0f61e58bcde457494 | |
| parent | Rewrite Asn1Sequence/Set to store elements as Asn1Encodable[] (diff) | |
| download | BouncyCastle.NET-ed25519-d8d62524a8380844f995ebc6fd44174ea8fac97b.tar.xz | |
SHA-256 performance tweak
| -rw-r--r-- | crypto/src/crypto/digests/Sha256Digest.cs | 48 |
1 files changed, 18 insertions, 30 deletions
diff --git a/crypto/src/crypto/digests/Sha256Digest.cs b/crypto/src/crypto/digests/Sha256Digest.cs index 98e10a34d..63d5b8bee 100644 --- a/crypto/src/crypto/digests/Sha256Digest.cs +++ b/crypto/src/crypto/digests/Sha256Digest.cs @@ -230,63 +230,51 @@ namespace Org.BouncyCastle.Crypto.Digests Array.Clear(X, 0, 16); } - private static uint Sum1Ch( - uint x, - uint y, - uint z) + private static uint Sum1Ch(uint x, uint y, uint z) { // return Sum1(x) + Ch(x, y, z); return (((x >> 6) | (x << 26)) ^ ((x >> 11) | (x << 21)) ^ ((x >> 25) | (x << 7))) - + ((x & y) ^ ((~x) & z)); - } + //+ ((x & y) ^ ((~x) & z)); + + (z ^ (x & (y ^ z))); + } - private static uint Sum0Maj( - uint x, - uint y, - uint z) + private static uint Sum0Maj(uint x, uint y, uint z) { // return Sum0(x) + Maj(x, y, z); return (((x >> 2) | (x << 30)) ^ ((x >> 13) | (x << 19)) ^ ((x >> 22) | (x << 10))) - + ((x & y) ^ (x & z) ^ (y & z)); - } + //+ ((x & y) ^ (x & z) ^ (y & z)); + + ((x & y) | (z & (x ^ y))); + } // /* SHA-256 functions */ -// private static uint Ch( -// uint x, -// uint y, -// uint z) +// private static uint Ch(uint x, uint y, uint z) // { -// return ((x & y) ^ ((~x) & z)); +// return (x & y) ^ ((~x) & z); +// //return z ^ (x & (y ^ z)); // } // -// private static uint Maj( -// uint x, -// uint y, -// uint z) +// private static uint Maj(uint x, uint y, uint z) // { -// return ((x & y) ^ (x & z) ^ (y & z)); +// //return (x & y) ^ (x & z) ^ (y & z); +// return (x & y) | (z & (x ^ y)); // } // -// private static uint Sum0( -// uint x) +// private static uint Sum0(uint x) // { // return ((x >> 2) | (x << 30)) ^ ((x >> 13) | (x << 19)) ^ ((x >> 22) | (x << 10)); // } // -// private static uint Sum1( -// uint x) +// private static uint Sum1(uint x) // { // return ((x >> 6) | (x << 26)) ^ ((x >> 11) | (x << 21)) ^ ((x >> 25) | (x << 7)); // } - private static uint Theta0( - uint x) + private static uint Theta0(uint x) { return ((x >> 7) | (x << 25)) ^ ((x >> 18) | (x << 14)) ^ (x >> 3); } - private static uint Theta1( - uint x) + private static uint Theta1(uint x) { return ((x >> 17) | (x << 15)) ^ ((x >> 19) | (x << 13)) ^ (x >> 10); } |