public static void HSalsa20(byte[] output, int outputOffset, byte[] key, int keyOffset, byte[] nonce, int nonceOffset) { Array16 <UInt32> state; state.x0 = SalsaConst0; state.x1 = ByteIntegerConverter.LoadLittleEndian32(key, keyOffset + 0); state.x2 = ByteIntegerConverter.LoadLittleEndian32(key, keyOffset + 4); state.x3 = ByteIntegerConverter.LoadLittleEndian32(key, keyOffset + 8); state.x4 = ByteIntegerConverter.LoadLittleEndian32(key, keyOffset + 12); state.x5 = SalsaConst1; state.x6 = ByteIntegerConverter.LoadLittleEndian32(nonce, nonceOffset + 0); state.x7 = ByteIntegerConverter.LoadLittleEndian32(nonce, nonceOffset + 4); state.x8 = ByteIntegerConverter.LoadLittleEndian32(nonce, nonceOffset + 8); state.x9 = ByteIntegerConverter.LoadLittleEndian32(nonce, nonceOffset + 12); state.x10 = SalsaConst2; state.x11 = ByteIntegerConverter.LoadLittleEndian32(key, keyOffset + 16); state.x12 = ByteIntegerConverter.LoadLittleEndian32(key, keyOffset + 20); state.x13 = ByteIntegerConverter.LoadLittleEndian32(key, keyOffset + 24); state.x14 = ByteIntegerConverter.LoadLittleEndian32(key, keyOffset + 28); state.x15 = SalsaConst3; SalsaCore.HSalsa(out state, ref state, 20); ByteIntegerConverter.StoreLittleEndian32(output, outputOffset + 0, state.x0); ByteIntegerConverter.StoreLittleEndian32(output, outputOffset + 4, state.x5); ByteIntegerConverter.StoreLittleEndian32(output, outputOffset + 8, state.x10); ByteIntegerConverter.StoreLittleEndian32(output, outputOffset + 12, state.x15); ByteIntegerConverter.StoreLittleEndian32(output, outputOffset + 16, state.x6); ByteIntegerConverter.StoreLittleEndian32(output, outputOffset + 20, state.x7); ByteIntegerConverter.StoreLittleEndian32(output, outputOffset + 24, state.x8); ByteIntegerConverter.StoreLittleEndian32(output, outputOffset + 28, state.x9); }
private static void EncryptInternal(byte[] ciphertext, int ciphertextOffset, byte[] message, int messageOffset, int messageLength, byte[] key, int keyOffset, byte[] nonce, int nonceOffset) { Array16 <UInt32> internalKey; PrepareInternalKey(out internalKey, key, keyOffset, nonce, nonceOffset); Array16 <UInt32> temp; var tempBytes = new byte[64];//todo: remove allocation Array8 <UInt32> poly1305Key; // first iteration { SalsaCore.Salsa(out temp, ref internalKey, 20); //first half is for Poly1305 poly1305Key.x0 = temp.x0; poly1305Key.x1 = temp.x1; poly1305Key.x2 = temp.x2; poly1305Key.x3 = temp.x3; poly1305Key.x4 = temp.x4; poly1305Key.x5 = temp.x5; poly1305Key.x6 = temp.x6; poly1305Key.x7 = temp.x7; // second half for the message ByteIntegerConverter.StoreLittleEndian32(tempBytes, 0, temp.x8); ByteIntegerConverter.StoreLittleEndian32(tempBytes, 4, temp.x9); ByteIntegerConverter.StoreLittleEndian32(tempBytes, 8, temp.x10); ByteIntegerConverter.StoreLittleEndian32(tempBytes, 12, temp.x11); ByteIntegerConverter.StoreLittleEndian32(tempBytes, 16, temp.x12); ByteIntegerConverter.StoreLittleEndian32(tempBytes, 20, temp.x13); ByteIntegerConverter.StoreLittleEndian32(tempBytes, 24, temp.x14); ByteIntegerConverter.StoreLittleEndian32(tempBytes, 28, temp.x15); int count = Math.Min(32, messageLength); for (int i = 0; i < count; i++) { ciphertext[16 + ciphertextOffset + i] = (byte)(message[messageOffset + i] ^ tempBytes[i]); } } // later iterations int blockOffset = 32; while (blockOffset < messageLength) { internalKey.x8++; SalsaCore.Salsa(out temp, ref internalKey, 20); ByteIntegerConverter.Array16StoreLittleEndian32(tempBytes, 0, ref temp); int count = Math.Min(64, messageLength - blockOffset); for (int i = 0; i < count; i++) { ciphertext[16 + ciphertextOffset + blockOffset + i] = (byte)(message[messageOffset + blockOffset + i] ^ tempBytes[i]); } blockOffset += 64; } // compute MAC Poly1305Donna.poly1305_auth(ciphertext, ciphertextOffset, ciphertext, ciphertextOffset + 16, messageLength, ref poly1305Key); }
public static void GetPublicKey(ArraySegment\\ publicKey, ArraySegment\\ privateKey) { if (publicKey.Array == null) throw new ArgumentNullException("publicKey.Array"); if (privateKey.Array == null) throw new ArgumentNullException("privateKey.Array"); if (publicKey.Count != PublicKeySizeInBytes) throw new ArgumentException("privateKey.Count must be 32"); if (privateKey.Count != PrivateKeySizeInBytes) throw new ArgumentException("privateKey.Count must be 32"); // hack: abusing publicKey as temporary storage // todo: remove hack for (int i = 0; i \\ salsaState; salsaState.x0 = c0; salsaState.x1 = ByteIntegerConverter.LoadLittleEndian32(sharedKey, offset + 0); salsaState.x2 = 0; salsaState.x3 = ByteIntegerConverter.LoadLittleEndian32(sharedKey, offset + 4); salsaState.x4 = ByteIntegerConverter.LoadLittleEndian32(sharedKey, offset + 8); salsaState.x5 = c1; salsaState.x6 = ByteIntegerConverter.LoadLittleEndian32(sharedKey, offset + 12); salsaState.x7 = 0; salsaState.x8 = 0; salsaState.x9 = ByteIntegerConverter.LoadLittleEndian32(sharedKey, offset + 16); salsaState.x10 = c2; salsaState.x11 = ByteIntegerConverter.LoadLittleEndian32(sharedKey, offset + 20); salsaState.x12 = ByteIntegerConverter.LoadLittleEndian32(sharedKey, offset + 24); salsaState.x13 = 0; salsaState.x14 = ByteIntegerConverter.LoadLittleEndian32(sharedKey, offset + 28); salsaState.x15 = c3; SalsaCore.Salsa(out salsaState, ref salsaState, 20); ByteIntegerConverter.StoreLittleEndian32(sharedKey, offset + 0, salsaState.x0); ByteIntegerConverter.StoreLittleEndian32(sharedKey, offset + 4, salsaState.x1); ByteIntegerConverter.StoreLittleEndian32(sharedKey, offset + 8, salsaState.x2); ByteIntegerConverter.StoreLittleEndian32(sharedKey, offset + 12, salsaState.x3); ByteIntegerConverter.StoreLittleEndian32(sharedKey, offset + 16, salsaState.x4); ByteIntegerConverter.StoreLittleEndian32(sharedKey, offset + 20, salsaState.x5); ByteIntegerConverter.StoreLittleEndian32(sharedKey, offset + 24, salsaState.x6); ByteIntegerConverter.StoreLittleEndian32(sharedKey, offset + 28, salsaState.x7); }
// hashes like the Curve25519 paper says internal static void KeyExchangeOutputHashCurve25519Paper(byte[] sharedKey, int offset) { //c = Curve25519output const UInt32 c0 = 'C' | 'u' << 8 | 'r' << 16 | (UInt32)'v' << 24; const UInt32 c1 = 'e' | '2' << 8 | '5' << 16 | (UInt32)'5' << 24; const UInt32 c2 = '1' | '9' << 8 | 'o' << 16 | (UInt32)'u' << 24; const UInt32 c3 = 't' | 'p' << 8 | 'u' << 16 | (UInt32)'t' << 24; Array16 <UInt32> salsaState; salsaState.x0 = c0; salsaState.x1 = ByteIntegerConverter.LoadLittleEndian32(sharedKey, offset + 0); salsaState.x2 = 0; salsaState.x3 = ByteIntegerConverter.LoadLittleEndian32(sharedKey, offset + 4); salsaState.x4 = ByteIntegerConverter.LoadLittleEndian32(sharedKey, offset + 8); salsaState.x5 = c1; salsaState.x6 = ByteIntegerConverter.LoadLittleEndian32(sharedKey, offset + 12); salsaState.x7 = 0; salsaState.x8 = 0; salsaState.x9 = ByteIntegerConverter.LoadLittleEndian32(sharedKey, offset + 16); salsaState.x10 = c2; salsaState.x11 = ByteIntegerConverter.LoadLittleEndian32(sharedKey, offset + 20); salsaState.x12 = ByteIntegerConverter.LoadLittleEndian32(sharedKey, offset + 24); salsaState.x13 = 0; salsaState.x14 = ByteIntegerConverter.LoadLittleEndian32(sharedKey, offset + 28); salsaState.x15 = c3; SalsaCore.Salsa(out salsaState, ref salsaState, 20); ByteIntegerConverter.StoreLittleEndian32(sharedKey, offset + 0, salsaState.x0); ByteIntegerConverter.StoreLittleEndian32(sharedKey, offset + 4, salsaState.x1); ByteIntegerConverter.StoreLittleEndian32(sharedKey, offset + 8, salsaState.x2); ByteIntegerConverter.StoreLittleEndian32(sharedKey, offset + 12, salsaState.x3); ByteIntegerConverter.StoreLittleEndian32(sharedKey, offset + 16, salsaState.x4); ByteIntegerConverter.StoreLittleEndian32(sharedKey, offset + 20, salsaState.x5); ByteIntegerConverter.StoreLittleEndian32(sharedKey, offset + 24, salsaState.x6); ByteIntegerConverter.StoreLittleEndian32(sharedKey, offset + 28, salsaState.x7); }
private static bool DecryptInternal(byte[] plaintext, int plaintextOffset, byte[] ciphertext, int ciphertextOffset, int ciphertextLength, byte[] key, int keyOffset, byte[] nonce, int nonceOffset) { int plaintextLength = ciphertextLength - MacSizeInBytes; Array16 <uint> internalKey; PrepareInternalKey(out internalKey, key, keyOffset, nonce, nonceOffset); Array16 <uint> temp; byte[] tempBytes = new byte[64]; //todo: remove allocation // first iteration { SalsaCore.HSalsa(out temp, ref internalKey, 20); //first half is for Poly1305 Array8 <uint> poly1305Key; poly1305Key.x0 = temp.x0; poly1305Key.x1 = temp.x1; poly1305Key.x2 = temp.x2; poly1305Key.x3 = temp.x3; poly1305Key.x4 = temp.x4; poly1305Key.x5 = temp.x5; poly1305Key.x6 = temp.x6; poly1305Key.x7 = temp.x7; // compute MAC Poly1305Donna.poly1305_auth(tempBytes, 0, ciphertext, ciphertextOffset + 16, plaintextLength, ref poly1305Key); if (!CryptoBytes.ConstantTimeEquals(tempBytes, 0, ciphertext, ciphertextOffset, MacSizeInBytes)) { Array.Clear(plaintext, plaintextOffset, plaintextLength); return(false); } // rest for the message ByteIntegerConverter.StoreLittleEndian32(tempBytes, 0, temp.x8); ByteIntegerConverter.StoreLittleEndian32(tempBytes, 4, temp.x9); ByteIntegerConverter.StoreLittleEndian32(tempBytes, 8, temp.x10); ByteIntegerConverter.StoreLittleEndian32(tempBytes, 12, temp.x11); ByteIntegerConverter.StoreLittleEndian32(tempBytes, 16, temp.x12); ByteIntegerConverter.StoreLittleEndian32(tempBytes, 20, temp.x13); ByteIntegerConverter.StoreLittleEndian32(tempBytes, 24, temp.x14); ByteIntegerConverter.StoreLittleEndian32(tempBytes, 28, temp.x15); int count = Math.Min(32, plaintextLength); for (int i = 0; i < count; i++) { plaintext[plaintextOffset + i] = (byte)(ciphertext[MacSizeInBytes + ciphertextOffset + i] ^ tempBytes[i]); } } // later iterations int blockOffset = 32; while (blockOffset < plaintextLength) { internalKey.x8++; SalsaCore.HSalsa(out temp, ref internalKey, 20); ByteIntegerConverter.Array16StoreLittleEndian32(tempBytes, 0, ref temp); int count = Math.Min(64, plaintextLength - blockOffset); for (int i = 0; i < count; i++) { plaintext[plaintextOffset + blockOffset + i] = (byte)(ciphertext[16 + ciphertextOffset + blockOffset + i] ^ tempBytes[i]); } blockOffset += 64; } return(true); }
// written by floodyberry (Andrew M.) // original license: MIT or PUBLIC DOMAIN // https://github.com/floodyberry/poly1305-donna/blob/master/poly1305-donna-unrolled.c public static void poly1305_auth(byte[] output, int outputOffset, byte[] m, int mStart, int mLength, ref Array8 <uint> key) { uint b; int j; /* clamp key */ var t0 = key.x0; var t1 = key.x1; var t2 = key.x2; var t3 = key.x3; /* precompute multipliers */ var r0 = t0 & 0x3ffffff; t0 >>= 26; t0 |= t1 << 6; var r1 = t0 & 0x3ffff03; t1 >>= 20; t1 |= t2 << 12; var r2 = t1 & 0x3ffc0ff; t2 >>= 14; t2 |= t3 << 18; var r3 = t2 & 0x3f03fff; t3 >>= 8; var r4 = t3 & 0x00fffff; var s1 = r1 * 5; var s2 = r2 * 5; var s3 = r3 * 5; var s4 = r4 * 5; /* init state */ uint h0 = 0; uint h1 = 0; uint h2 = 0; uint h3 = 0; uint h4 = 0; /* full blocks */ if (mLength < 16) { goto poly1305_donna_atmost15bytes; } poly1305_donna_16bytes: mStart += 16; mLength -= 16; t0 = ByteIntegerConverter.LoadLittleEndian32(m, mStart - 16); t1 = ByteIntegerConverter.LoadLittleEndian32(m, mStart - 12); t2 = ByteIntegerConverter.LoadLittleEndian32(m, mStart - 8); t3 = ByteIntegerConverter.LoadLittleEndian32(m, mStart - 4); h0 += t0 & 0x3ffffff; h1 += (uint)(((((ulong)t1 << 32) | t0) >> 26) & 0x3ffffff); h2 += (uint)(((((ulong)t2 << 32) | t1) >> 20) & 0x3ffffff); h3 += (uint)(((((ulong)t3 << 32) | t2) >> 14) & 0x3ffffff); h4 += (t3 >> 8) | (1 << 24); poly1305_donna_mul: var tt0 = (ulong)h0 * r0 + (ulong)h1 * s4 + (ulong)h2 * s3 + (ulong)h3 * s2 + (ulong)h4 * s1; var tt1 = (ulong)h0 * r1 + (ulong)h1 * r0 + (ulong)h2 * s4 + (ulong)h3 * s3 + (ulong)h4 * s2; var tt2 = (ulong)h0 * r2 + (ulong)h1 * r1 + (ulong)h2 * r0 + (ulong)h3 * s4 + (ulong)h4 * s3; var tt3 = (ulong)h0 * r3 + (ulong)h1 * r2 + (ulong)h2 * r1 + (ulong)h3 * r0 + (ulong)h4 * s4; var tt4 = (ulong)h0 * r4 + (ulong)h1 * r3 + (ulong)h2 * r2 + (ulong)h3 * r1 + (ulong)h4 * r0; unchecked { h0 = (uint)tt0 & 0x3ffffff; var c = tt0 >> 26; tt1 += c; h1 = (uint)tt1 & 0x3ffffff; b = (uint)(tt1 >> 26); tt2 += b; h2 = (uint)tt2 & 0x3ffffff; b = (uint)(tt2 >> 26); tt3 += b; h3 = (uint)tt3 & 0x3ffffff; b = (uint)(tt3 >> 26); tt4 += b; h4 = (uint)tt4 & 0x3ffffff; b = (uint)(tt4 >> 26); } h0 += b * 5; if (mLength >= 16) { goto poly1305_donna_16bytes; } /* final bytes */ poly1305_donna_atmost15bytes: if (mLength == 0) { goto poly1305_donna_finish; } var mp = new byte[16]; for (j = 0; j < mLength; j++) { mp[j] = m[mStart + j]; } mp[j++] = 1; for (; j < 16; j++) { mp[j] = 0; } mLength = 0; t0 = ByteIntegerConverter.LoadLittleEndian32(mp, 0); t1 = ByteIntegerConverter.LoadLittleEndian32(mp, 4); t2 = ByteIntegerConverter.LoadLittleEndian32(mp, 8); t3 = ByteIntegerConverter.LoadLittleEndian32(mp, 12); CryptoBytes.Wipe(mp); h0 += t0 & 0x3ffffff; h1 += (uint)(((((ulong)t1 << 32) | t0) >> 26) & 0x3ffffff); h2 += (uint)(((((ulong)t2 << 32) | t1) >> 20) & 0x3ffffff); h3 += (uint)(((((ulong)t3 << 32) | t2) >> 14) & 0x3ffffff); h4 += t3 >> 8; goto poly1305_donna_mul; poly1305_donna_finish: b = h0 >> 26; h0 = h0 & 0x3ffffff; h1 += b; b = h1 >> 26; h1 = h1 & 0x3ffffff; h2 += b; b = h2 >> 26; h2 = h2 & 0x3ffffff; h3 += b; b = h3 >> 26; h3 = h3 & 0x3ffffff; h4 += b; b = h4 >> 26; h4 = h4 & 0x3ffffff; h0 += b * 5; var g0 = h0 + 5; b = g0 >> 26; g0 &= 0x3ffffff; var g1 = h1 + b; b = g1 >> 26; g1 &= 0x3ffffff; var g2 = h2 + b; b = g2 >> 26; g2 &= 0x3ffffff; var g3 = h3 + b; b = g3 >> 26; g3 &= 0x3ffffff; var g4 = unchecked (h4 + b - (1 << 26)); b = (g4 >> 31) - 1; var nb = ~b; h0 = (h0 & nb) | (g0 & b); h1 = (h1 & nb) | (g1 & b); h2 = (h2 & nb) | (g2 & b); h3 = (h3 & nb) | (g3 & b); h4 = (h4 & nb) | (g4 & b); var f0 = (h0 | (h1 << 26)) + (ulong)key.x4; var f1 = ((h1 >> 6) | (h2 << 20)) + (ulong)key.x5; var f2 = ((h2 >> 12) | (h3 << 14)) + (ulong)key.x6; var f3 = ((h3 >> 18) | (h4 << 8)) + (ulong)key.x7; unchecked { ByteIntegerConverter.StoreLittleEndian32(output, outputOffset + 0, (uint)f0); f1 += f0 >> 32; ByteIntegerConverter.StoreLittleEndian32(output, outputOffset + 4, (uint)f1); f2 += f1 >> 32; ByteIntegerConverter.StoreLittleEndian32(output, outputOffset + 8, (uint)f2); f3 += f2 >> 32; ByteIntegerConverter.StoreLittleEndian32(output, outputOffset + 12, (uint)f3); } }
private static bool DecryptInternal(byte[] plaintext, int plaintextOffset, byte[] ciphertext, int ciphertextOffset, int ciphertextLength, byte[] key, int keyOffset, byte[] nonce, int nonceOffset) { int plaintextLength = ciphertextLength - MacSizeInBytes; Array16\\ internalKey; PrepareInternalKey(out internalKey, key, keyOffset, nonce, nonceOffset); Array16\\ temp; var tempBytes = new byte[64];//todo: remove allocation // first iteration { SalsaCore.Salsa(out temp, ref internalKey, 20); //first half is for Poly1305 Array8\\ poly1305Key; poly1305Key.x0 = temp.x0; poly1305Key.x1 = temp.x1; poly1305Key.x2 = temp.x2; poly1305Key.x3 = temp.x3; poly1305Key.x4 = temp.x4; poly1305Key.x5 = temp.x5; poly1305Key.x6 = temp.x6; poly1305Key.x7 = temp.x7; // compute MAC Poly1305Donna.poly1305_auth(tempBytes, 0, ciphertext, ciphertextOffset + 16, plaintextLength, ref poly1305Key); if (!CryptoBytes.ConstantTimeEquals(tempBytes, 0, ciphertext, ciphertextOffset, MacSizeInBytes)) { Array.Clear(plaintext, plaintextOffset, plaintextLength); return false; } // rest for the message ByteIntegerConverter.StoreLittleEndian32(tempBytes, 0, temp.x8); ByteIntegerConverter.StoreLittleEndian32(tempBytes, 4, temp.x9); ByteIntegerConverter.StoreLittleEndian32(tempBytes, 8, temp.x10); ByteIntegerConverter.StoreLittleEndian32(tempBytes, 12, temp.x11); ByteIntegerConverter.StoreLittleEndian32(tempBytes, 16, temp.x12); ByteIntegerConverter.StoreLittleEndian32(tempBytes, 20, temp.x13); ByteIntegerConverter.StoreLittleEndian32(tempBytes, 24, temp.x14); ByteIntegerConverter.StoreLittleEndian32(tempBytes, 28, temp.x15); int count = Math.Min(32, plaintextLength); for (int i = 0; i \\ internalKey; PrepareInternalKey(out internalKey, key, keyOffset, nonce, nonceOffset); Array16\\ temp; var tempBytes = new byte[64];//todo: remove allocation Array8\\ poly1305Key; // first iteration { SalsaCore.Salsa(out temp, ref internalKey, 20); //first half is for Poly1305 poly1305Key.x0 = temp.x0; poly1305Key.x1 = temp.x1; poly1305Key.x2 = temp.x2; poly1305Key.x3 = temp.x3; poly1305Key.x4 = temp.x4; poly1305Key.x5 = temp.x5; poly1305Key.x6 = temp.x6; poly1305Key.x7 = temp.x7; // second half for the message ByteIntegerConverter.StoreLittleEndian32(tempBytes, 0, temp.x8); ByteIntegerConverter.StoreLittleEndian32(tempBytes, 4, temp.x9); ByteIntegerConverter.StoreLittleEndian32(tempBytes, 8, temp.x10); ByteIntegerConverter.StoreLittleEndian32(tempBytes, 12, temp.x11); ByteIntegerConverter.StoreLittleEndian32(tempBytes, 16, temp.x12); ByteIntegerConverter.StoreLittleEndian32(tempBytes, 20, temp.x13); ByteIntegerConverter.StoreLittleEndian32(tempBytes, 24, temp.x14); ByteIntegerConverter.StoreLittleEndian32(tempBytes, 28, temp.x15); int count = Math.Min(32, messageLength); for (int i = 0; i \
// written by floodyberry (Andrew M.) // original license: MIT or PUBLIC DOMAIN // https://github.com/floodyberry/poly1305-donna/blob/master/poly1305-donna-unrolled.c public static void poly1305_auth(byte[] output, int outputOffset, byte[] m, int mStart, int mLength, ref Array8 <UInt32> key) { UInt32 t0, t1, t2, t3; UInt32 h0, h1, h2, h3, h4; UInt32 r0, r1, r2, r3, r4; UInt32 s1, s2, s3, s4; UInt32 b, nb; int j; UInt64 tt0, tt1, tt2, tt3, tt4; UInt64 f0, f1, f2, f3; UInt32 g0, g1, g2, g3, g4; UInt64 c; /* clamp key */ t0 = key.x0; t1 = key.x1; t2 = key.x2; t3 = key.x3; /* precompute multipliers */ r0 = t0 & 0x3ffffff; t0 >>= 26; t0 |= t1 << 6; r1 = t0 & 0x3ffff03; t1 >>= 20; t1 |= t2 << 12; r2 = t1 & 0x3ffc0ff; t2 >>= 14; t2 |= t3 << 18; r3 = t2 & 0x3f03fff; t3 >>= 8; r4 = t3 & 0x00fffff; s1 = r1 * 5; s2 = r2 * 5; s3 = r3 * 5; s4 = r4 * 5; /* init state */ h0 = 0; h1 = 0; h2 = 0; h3 = 0; h4 = 0; /* full blocks */ if (mLength < 16) { goto poly1305_donna_atmost15bytes; } poly1305_donna_16bytes: mStart += 16; mLength -= 16; t0 = ByteIntegerConverter.LoadLittleEndian32(m, mStart - 16); t1 = ByteIntegerConverter.LoadLittleEndian32(m, mStart - 12); t2 = ByteIntegerConverter.LoadLittleEndian32(m, mStart - 8); t3 = ByteIntegerConverter.LoadLittleEndian32(m, mStart - 4); //todo: looks like these can be simplified a bit h0 += t0 & 0x3ffffff; h1 += (uint)(((((UInt64)t1 << 32) | t0) >> 26) & 0x3ffffff); h2 += (uint)(((((UInt64)t2 << 32) | t1) >> 20) & 0x3ffffff); h3 += (uint)(((((UInt64)t3 << 32) | t2) >> 14) & 0x3ffffff); h4 += (t3 >> 8) | (1 << 24); poly1305_donna_mul: tt0 = (ulong)h0 * r0 + (ulong)h1 * s4 + (ulong)h2 * s3 + (ulong)h3 * s2 + (ulong)h4 * s1; tt1 = (ulong)h0 * r1 + (ulong)h1 * r0 + (ulong)h2 * s4 + (ulong)h3 * s3 + (ulong)h4 * s2; tt2 = (ulong)h0 * r2 + (ulong)h1 * r1 + (ulong)h2 * r0 + (ulong)h3 * s4 + (ulong)h4 * s3; tt3 = (ulong)h0 * r3 + (ulong)h1 * r2 + (ulong)h2 * r1 + (ulong)h3 * r0 + (ulong)h4 * s4; tt4 = (ulong)h0 * r4 + (ulong)h1 * r3 + (ulong)h2 * r2 + (ulong)h3 * r1 + (ulong)h4 * r0; unchecked { h0 = (UInt32)tt0 & 0x3ffffff; c = (tt0 >> 26); tt1 += c; h1 = (UInt32)tt1 & 0x3ffffff; b = (UInt32)(tt1 >> 26); tt2 += b; h2 = (UInt32)tt2 & 0x3ffffff; b = (UInt32)(tt2 >> 26); tt3 += b; h3 = (UInt32)tt3 & 0x3ffffff; b = (UInt32)(tt3 >> 26); tt4 += b; h4 = (UInt32)tt4 & 0x3ffffff; b = (UInt32)(tt4 >> 26); } h0 += b * 5; if (mLength >= 16) { goto poly1305_donna_16bytes; } /* final bytes */ poly1305_donna_atmost15bytes: if (mLength == 0) { goto poly1305_donna_finish; } byte[] mp = new byte[16];//todo remove allocation for (j = 0; j < mLength; j++) { mp[j] = m[mStart + j]; } mp[j++] = 1; for (; j < 16; j++) { mp[j] = 0; } mLength = 0; t0 = ByteIntegerConverter.LoadLittleEndian32(mp, 0); t1 = ByteIntegerConverter.LoadLittleEndian32(mp, 4); t2 = ByteIntegerConverter.LoadLittleEndian32(mp, 8); t3 = ByteIntegerConverter.LoadLittleEndian32(mp, 12); CryptoExtensions.Wipe(mp); h0 += t0 & 0x3ffffff; h1 += (uint)(((((UInt64)t1 << 32) | t0) >> 26) & 0x3ffffff); h2 += (uint)(((((UInt64)t2 << 32) | t1) >> 20) & 0x3ffffff); h3 += (uint)(((((UInt64)t3 << 32) | t2) >> 14) & 0x3ffffff); h4 += t3 >> 8; goto poly1305_donna_mul; poly1305_donna_finish: b = h0 >> 26; h0 = h0 & 0x3ffffff; h1 += b; b = h1 >> 26; h1 = h1 & 0x3ffffff; h2 += b; b = h2 >> 26; h2 = h2 & 0x3ffffff; h3 += b; b = h3 >> 26; h3 = h3 & 0x3ffffff; h4 += b; b = h4 >> 26; h4 = h4 & 0x3ffffff; h0 += b * 5; g0 = h0 + 5; b = g0 >> 26; g0 &= 0x3ffffff; g1 = h1 + b; b = g1 >> 26; g1 &= 0x3ffffff; g2 = h2 + b; b = g2 >> 26; g2 &= 0x3ffffff; g3 = h3 + b; b = g3 >> 26; g3 &= 0x3ffffff; g4 = unchecked (h4 + b - (1 << 26)); b = (g4 >> 31) - 1; nb = ~b; h0 = (h0 & nb) | (g0 & b); h1 = (h1 & nb) | (g1 & b); h2 = (h2 & nb) | (g2 & b); h3 = (h3 & nb) | (g3 & b); h4 = (h4 & nb) | (g4 & b); f0 = ((h0) | (h1 << 26)) + (UInt64)key.x4; f1 = ((h1 >> 6) | (h2 << 20)) + (UInt64)key.x5; f2 = ((h2 >> 12) | (h3 << 14)) + (UInt64)key.x6; f3 = ((h3 >> 18) | (h4 << 8)) + (UInt64)key.x7; unchecked { ByteIntegerConverter.StoreLittleEndian32(output, outputOffset + 0, (uint)f0); f1 += (f0 >> 32); ByteIntegerConverter.StoreLittleEndian32(output, outputOffset + 4, (uint)f1); f2 += (f1 >> 32); ByteIntegerConverter.StoreLittleEndian32(output, outputOffset + 8, (uint)f2); f3 += (f2 >> 32); ByteIntegerConverter.StoreLittleEndian32(output, outputOffset + 12, (uint)f3); } }