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293 lines
7.0 KiB
293 lines
7.0 KiB
#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR) |
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#pragma warning disable |
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using System; |
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Utilities; |
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using BestHTTP.SecureProtocol.Org.BouncyCastle.Utilities; |
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namespace BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Digests |
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{ |
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/** |
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* SHA-224 as described in RFC 3874 |
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* <pre> |
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* block word digest |
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* SHA-1 512 32 160 |
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* SHA-224 512 32 224 |
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* SHA-256 512 32 256 |
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* SHA-384 1024 64 384 |
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* SHA-512 1024 64 512 |
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* </pre> |
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*/ |
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public class Sha224Digest |
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: GeneralDigest |
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{ |
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private const int DigestLength = 28; |
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private uint H1, H2, H3, H4, H5, H6, H7, H8; |
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private uint[] X = new uint[64]; |
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private int xOff; |
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/** |
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* Standard constructor |
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*/ |
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public Sha224Digest() |
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{ |
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Reset(); |
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} |
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/** |
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* Copy constructor. This will copy the state of the provided |
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* message digest. |
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*/ |
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public Sha224Digest( |
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Sha224Digest t) |
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: base(t) |
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{ |
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CopyIn(t); |
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} |
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private void CopyIn(Sha224Digest t) |
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{ |
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base.CopyIn(t); |
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H1 = t.H1; |
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H2 = t.H2; |
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H3 = t.H3; |
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H4 = t.H4; |
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H5 = t.H5; |
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H6 = t.H6; |
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H7 = t.H7; |
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H8 = t.H8; |
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Array.Copy(t.X, 0, X, 0, t.X.Length); |
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xOff = t.xOff; |
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} |
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public override string AlgorithmName |
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{ |
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get { return "SHA-224"; } |
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} |
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public override int GetDigestSize() |
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{ |
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return DigestLength; |
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} |
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internal override void ProcessWord( |
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byte[] input, |
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int inOff) |
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{ |
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X[xOff] = Pack.BE_To_UInt32(input, inOff); |
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if (++xOff == 16) |
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{ |
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ProcessBlock(); |
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} |
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} |
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internal override void ProcessLength( |
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long bitLength) |
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{ |
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if (xOff > 14) |
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{ |
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ProcessBlock(); |
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} |
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X[14] = (uint)((ulong)bitLength >> 32); |
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X[15] = (uint)((ulong)bitLength); |
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} |
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public override int DoFinal( |
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byte[] output, |
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int outOff) |
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{ |
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Finish(); |
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Pack.UInt32_To_BE(H1, output, outOff); |
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Pack.UInt32_To_BE(H2, output, outOff + 4); |
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Pack.UInt32_To_BE(H3, output, outOff + 8); |
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Pack.UInt32_To_BE(H4, output, outOff + 12); |
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Pack.UInt32_To_BE(H5, output, outOff + 16); |
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Pack.UInt32_To_BE(H6, output, outOff + 20); |
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Pack.UInt32_To_BE(H7, output, outOff + 24); |
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Reset(); |
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return DigestLength; |
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} |
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/** |
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* reset the chaining variables |
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*/ |
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public override void Reset() |
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{ |
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base.Reset(); |
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/* SHA-224 initial hash value |
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*/ |
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H1 = 0xc1059ed8; |
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H2 = 0x367cd507; |
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H3 = 0x3070dd17; |
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H4 = 0xf70e5939; |
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H5 = 0xffc00b31; |
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H6 = 0x68581511; |
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H7 = 0x64f98fa7; |
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H8 = 0xbefa4fa4; |
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xOff = 0; |
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Array.Clear(X, 0, X.Length); |
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} |
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internal override void ProcessBlock() |
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{ |
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// |
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// expand 16 word block into 64 word blocks. |
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// |
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for (int ti = 16; ti <= 63; ti++) |
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{ |
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X[ti] = Theta1(X[ti - 2]) + X[ti - 7] + Theta0(X[ti - 15]) + X[ti - 16]; |
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} |
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// |
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// set up working variables. |
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// |
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uint a = H1; |
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uint b = H2; |
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uint c = H3; |
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uint d = H4; |
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uint e = H5; |
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uint f = H6; |
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uint g = H7; |
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uint h = H8; |
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int t = 0; |
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for(int i = 0; i < 8; i ++) |
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{ |
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// t = 8 * i |
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h += Sum1(e) + Ch(e, f, g) + K[t] + X[t]; |
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d += h; |
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h += Sum0(a) + Maj(a, b, c); |
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++t; |
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// t = 8 * i + 1 |
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g += Sum1(d) + Ch(d, e, f) + K[t] + X[t]; |
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c += g; |
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g += Sum0(h) + Maj(h, a, b); |
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++t; |
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// t = 8 * i + 2 |
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f += Sum1(c) + Ch(c, d, e) + K[t] + X[t]; |
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b += f; |
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f += Sum0(g) + Maj(g, h, a); |
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++t; |
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// t = 8 * i + 3 |
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e += Sum1(b) + Ch(b, c, d) + K[t] + X[t]; |
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a += e; |
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e += Sum0(f) + Maj(f, g, h); |
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++t; |
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// t = 8 * i + 4 |
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d += Sum1(a) + Ch(a, b, c) + K[t] + X[t]; |
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h += d; |
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d += Sum0(e) + Maj(e, f, g); |
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++t; |
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// t = 8 * i + 5 |
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c += Sum1(h) + Ch(h, a, b) + K[t] + X[t]; |
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g += c; |
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c += Sum0(d) + Maj(d, e, f); |
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++t; |
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// t = 8 * i + 6 |
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b += Sum1(g) + Ch(g, h, a) + K[t] + X[t]; |
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f += b; |
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b += Sum0(c) + Maj(c, d, e); |
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++t; |
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// t = 8 * i + 7 |
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a += Sum1(f) + Ch(f, g, h) + K[t] + X[t]; |
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e += a; |
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a += Sum0(b) + Maj(b, c, d); |
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++t; |
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} |
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H1 += a; |
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H2 += b; |
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H3 += c; |
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H4 += d; |
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H5 += e; |
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H6 += f; |
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H7 += g; |
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H8 += h; |
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// |
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// reset the offset and clean out the word buffer. |
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// |
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xOff = 0; |
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Array.Clear(X, 0, 16); |
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} |
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/* SHA-224 functions */ |
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private static uint Ch(uint x, uint y, uint z) |
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{ |
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return (x & y) ^ (~x & z); |
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} |
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private static uint Maj(uint x, uint y, uint z) |
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{ |
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return (x & y) ^ (x & z) ^ (y & z); |
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} |
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private static uint Sum0(uint x) |
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{ |
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return ((x >> 2) | (x << 30)) ^ ((x >> 13) | (x << 19)) ^ ((x >> 22) | (x << 10)); |
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} |
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private static uint Sum1(uint x) |
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{ |
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return ((x >> 6) | (x << 26)) ^ ((x >> 11) | (x << 21)) ^ ((x >> 25) | (x << 7)); |
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} |
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private static uint Theta0(uint x) |
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{ |
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return ((x >> 7) | (x << 25)) ^ ((x >> 18) | (x << 14)) ^ (x >> 3); |
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} |
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private static uint Theta1(uint x) |
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{ |
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return ((x >> 17) | (x << 15)) ^ ((x >> 19) | (x << 13)) ^ (x >> 10); |
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} |
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/* SHA-224 Constants |
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* (represent the first 32 bits of the fractional parts of the |
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* cube roots of the first sixty-four prime numbers) |
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*/ |
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internal static readonly uint[] K = { |
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0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, |
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0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, |
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0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, |
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0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, |
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0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, |
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0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, |
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0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, |
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0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 |
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}; |
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public override IMemoable Copy() |
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{ |
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return new Sha224Digest(this); |
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} |
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public override void Reset(IMemoable other) |
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{ |
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Sha224Digest d = (Sha224Digest)other; |
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CopyIn(d); |
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} |
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} |
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} |
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#pragma warning restore |
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#endif
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