1f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Projectpackage org.bouncycastle.crypto.digests; 2f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 3f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 4f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Projectimport org.bouncycastle.crypto.digests.GeneralDigest; 5f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 6f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 7f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project/** 8f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * FIPS 180-2 implementation of SHA-256. 9f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * 10f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * <pre> 11f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * block word digest 12f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * SHA-1 512 32 160 13f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * SHA-256 512 32 256 14f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * SHA-384 1024 64 384 15f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * SHA-512 1024 64 512 16f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * </pre> 17f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 18f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Projectpublic class SHA256Digest 19f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project extends GeneralDigest 20f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project{ 21f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project private static final int DIGEST_LENGTH = 32; 22f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 23f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project private int H1, H2, H3, H4, H5, H6, H7, H8; 24f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 25f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project private int[] X = new int[64]; 26f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project private int xOff; 27f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 28f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project /** 29f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * Standard constructor 30f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 31f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project public SHA256Digest() 32f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 33f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project reset(); 34f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 35f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 36f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project /** 37f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * Copy constructor. This will copy the state of the provided 38f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * message digest. 39f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 40f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project public SHA256Digest(SHA256Digest t) 41f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 42f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project super(t); 43f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 44f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project H1 = t.H1; 45f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project H2 = t.H2; 46f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project H3 = t.H3; 47f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project H4 = t.H4; 48f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project H5 = t.H5; 49f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project H6 = t.H6; 50f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project H7 = t.H7; 51f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project H8 = t.H8; 52f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 53f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project System.arraycopy(t.X, 0, X, 0, t.X.length); 54f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project xOff = t.xOff; 55f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 56f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 57f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project public String getAlgorithmName() 58f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 59f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return "SHA-256"; 60f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 61f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 62f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project public int getDigestSize() 63f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 64f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return DIGEST_LENGTH; 65f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 66f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 67f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project protected void processWord( 68f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project byte[] in, 69f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int inOff) 70f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 71f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project X[xOff++] = ((in[inOff] & 0xff) << 24) | ((in[inOff + 1] & 0xff) << 16) 72f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project | ((in[inOff + 2] & 0xff) << 8) | ((in[inOff + 3] & 0xff)); 73f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 74f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (xOff == 16) 75f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 76f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project processBlock(); 77f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 78f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 79f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 80f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project private void unpackWord( 81f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int word, 82f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project byte[] out, 83f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int outOff) 84f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 85f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project out[outOff] = (byte)(word >>> 24); 86f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project out[outOff + 1] = (byte)(word >>> 16); 87f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project out[outOff + 2] = (byte)(word >>> 8); 88f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project out[outOff + 3] = (byte)word; 89f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 90f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 91f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project protected void processLength( 92f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project long bitLength) 93f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 94f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project if (xOff > 14) 95f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 96f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project processBlock(); 97f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 98f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 99f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project X[14] = (int)(bitLength >>> 32); 100f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project X[15] = (int)(bitLength & 0xffffffff); 101f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 102f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 103f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project public int doFinal( 104f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project byte[] out, 105f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int outOff) 106f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 107f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project finish(); 108f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 109f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project unpackWord(H1, out, outOff); 110f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project unpackWord(H2, out, outOff + 4); 111f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project unpackWord(H3, out, outOff + 8); 112f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project unpackWord(H4, out, outOff + 12); 113f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project unpackWord(H5, out, outOff + 16); 114f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project unpackWord(H6, out, outOff + 20); 115f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project unpackWord(H7, out, outOff + 24); 116f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project unpackWord(H8, out, outOff + 28); 117f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 118f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project reset(); 119f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 120f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return DIGEST_LENGTH; 121f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 122f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 123f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project /** 124f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * reset the chaining variables 125f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 126f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project public void reset() 127f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 128f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project super.reset(); 129f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 130f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project /* SHA-256 initial hash value 131f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * The first 32 bits of the fractional parts of the square roots 132f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * of the first eight prime numbers 133f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 134f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 135f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project H1 = 0x6a09e667; 136f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project H2 = 0xbb67ae85; 137f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project H3 = 0x3c6ef372; 138f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project H4 = 0xa54ff53a; 139f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project H5 = 0x510e527f; 140f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project H6 = 0x9b05688c; 141f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project H7 = 0x1f83d9ab; 142f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project H8 = 0x5be0cd19; 143f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 144f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project xOff = 0; 145f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project for (int i = 0; i != X.length; i++) 146f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 147f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project X[i] = 0; 148f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 149f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 150f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 151f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project protected void processBlock() 152f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 153f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // 154f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // expand 16 word block into 64 word blocks. 155f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // 156f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project for (int t = 16; t <= 63; t++) 157f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 158f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project X[t] = Theta1(X[t - 2]) + X[t - 7] + Theta0(X[t - 15]) + X[t - 16]; 159f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 160f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 161f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // 162f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // set up working variables. 163f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // 164f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int a = H1; 165f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int b = H2; 166f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int c = H3; 167f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int d = H4; 168f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int e = H5; 169f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int f = H6; 170f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int g = H7; 171f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int h = H8; 172f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 173f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int t = 0; 174f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project for(int i = 0; i < 8; i ++) 175f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 176f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // t = 8 * i 177f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project h += Sum1(e) + Ch(e, f, g) + K[t] + X[t++]; 178f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project d += h; 179f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project h += Sum0(a) + Maj(a, b, c); 180f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 181f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // t = 8 * i + 1 182f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project g += Sum1(d) + Ch(d, e, f) + K[t] + X[t++]; 183f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project c += g; 184f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project g += Sum0(h) + Maj(h, a, b); 185f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 186f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // t = 8 * i + 2 187f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project f += Sum1(c) + Ch(c, d, e) + K[t] + X[t++]; 188f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project b += f; 189f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project f += Sum0(g) + Maj(g, h, a); 190f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 191f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // t = 8 * i + 3 192f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project e += Sum1(b) + Ch(b, c, d) + K[t] + X[t++]; 193f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project a += e; 194f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project e += Sum0(f) + Maj(f, g, h); 195f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 196f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // t = 8 * i + 4 197f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project d += Sum1(a) + Ch(a, b, c) + K[t] + X[t++]; 198f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project h += d; 199f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project d += Sum0(e) + Maj(e, f, g); 200f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 201f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // t = 8 * i + 5 202f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project c += Sum1(h) + Ch(h, a, b) + K[t] + X[t++]; 203f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project g += c; 204f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project c += Sum0(d) + Maj(d, e, f); 205f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 206f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // t = 8 * i + 6 207f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project b += Sum1(g) + Ch(g, h, a) + K[t] + X[t++]; 208f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project f += b; 209f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project b += Sum0(c) + Maj(c, d, e); 210f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 211f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // t = 8 * i + 7 212f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project a += Sum1(f) + Ch(f, g, h) + K[t] + X[t++]; 213f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project e += a; 214f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project a += Sum0(b) + Maj(b, c, d); 215f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 216f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 217f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project H1 += a; 218f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project H2 += b; 219f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project H3 += c; 220f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project H4 += d; 221f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project H5 += e; 222f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project H6 += f; 223f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project H7 += g; 224f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project H8 += h; 225f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 226f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // 227f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // reset the offset and clean out the word buffer. 228f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project // 229f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project xOff = 0; 230f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project for (int i = 0; i < 16; i++) 231f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 232f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project X[i] = 0; 233f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 234f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 235f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 236f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project /* SHA-256 functions */ 237f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project private int Ch( 238f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int x, 239f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int y, 240f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int z) 241f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 242f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return (x & y) ^ ((~x) & z); 243f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 244f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 245f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project private int Maj( 246f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int x, 247f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int y, 248f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int z) 249f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 250f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return (x & y) ^ (x & z) ^ (y & z); 251f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 252f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 253f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project private int Sum0( 254f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int x) 255f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 256f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return ((x >>> 2) | (x << 30)) ^ ((x >>> 13) | (x << 19)) ^ ((x >>> 22) | (x << 10)); 257f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 258f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 259f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project private int Sum1( 260f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int x) 261f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 262f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return ((x >>> 6) | (x << 26)) ^ ((x >>> 11) | (x << 21)) ^ ((x >>> 25) | (x << 7)); 263f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 264f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 265f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project private int Theta0( 266f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int x) 267f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 268f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return ((x >>> 7) | (x << 25)) ^ ((x >>> 18) | (x << 14)) ^ (x >>> 3); 269f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 270f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 271f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project private int Theta1( 272f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project int x) 273f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project { 274f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project return ((x >>> 17) | (x << 15)) ^ ((x >>> 19) | (x << 13)) ^ (x >>> 10); 275f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project } 276f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 277f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project /* SHA-256 Constants 278f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * (represent the first 32 bits of the fractional parts of the 279f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * cube roots of the first sixty-four prime numbers) 280f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 281f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project static final int K[] = { 282f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, 283f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 284f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 285f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, 286f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 287f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, 288f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 289f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project }; 290f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project} 291f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 292