diff options
Diffstat (limited to 'libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/digests/SHA256Digest.java')
-rw-r--r-- | libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/digests/SHA256Digest.java | 314 |
1 files changed, 0 insertions, 314 deletions
diff --git a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/digests/SHA256Digest.java b/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/digests/SHA256Digest.java deleted file mode 100644 index f14c50ae6..000000000 --- a/libraries/spongycastle/core/src/main/java/org/spongycastle/crypto/digests/SHA256Digest.java +++ /dev/null @@ -1,314 +0,0 @@ -package org.spongycastle.crypto.digests; - - -import org.spongycastle.crypto.util.Pack; -import org.spongycastle.util.Memoable; - - -/** - * FIPS 180-2 implementation of SHA-256. - * - * <pre> - * block word digest - * SHA-1 512 32 160 - * SHA-256 512 32 256 - * SHA-384 1024 64 384 - * SHA-512 1024 64 512 - * </pre> - */ -public class SHA256Digest - extends GeneralDigest -{ - private static final int DIGEST_LENGTH = 32; - - private int H1, H2, H3, H4, H5, H6, H7, H8; - - private int[] X = new int[64]; - private int xOff; - - /** - * Standard constructor - */ - public SHA256Digest() - { - reset(); - } - - /** - * Copy constructor. This will copy the state of the provided - * message digest. - */ - public SHA256Digest(SHA256Digest t) - { - super(t); - - copyIn(t); - } - - private void copyIn(SHA256Digest t) - { - super.copyIn(t); - - H1 = t.H1; - H2 = t.H2; - H3 = t.H3; - H4 = t.H4; - H5 = t.H5; - H6 = t.H6; - H7 = t.H7; - H8 = t.H8; - - System.arraycopy(t.X, 0, X, 0, t.X.length); - xOff = t.xOff; - } - - public String getAlgorithmName() - { - return "SHA-256"; - } - - public int getDigestSize() - { - return DIGEST_LENGTH; - } - - protected void processWord( - byte[] in, - int inOff) - { - // Note: Inlined for performance -// X[xOff] = Pack.bigEndianToInt(in, inOff); - int n = in[inOff] << 24; - n |= (in[++inOff] & 0xff) << 16; - n |= (in[++inOff] & 0xff) << 8; - n |= (in[++inOff] & 0xff); - X[xOff] = n; - - if (++xOff == 16) - { - processBlock(); - } - } - - protected void processLength( - long bitLength) - { - if (xOff > 14) - { - processBlock(); - } - - X[14] = (int)(bitLength >>> 32); - X[15] = (int)(bitLength & 0xffffffff); - } - - public int doFinal( - byte[] out, - int outOff) - { - finish(); - - Pack.intToBigEndian(H1, out, outOff); - Pack.intToBigEndian(H2, out, outOff + 4); - Pack.intToBigEndian(H3, out, outOff + 8); - Pack.intToBigEndian(H4, out, outOff + 12); - Pack.intToBigEndian(H5, out, outOff + 16); - Pack.intToBigEndian(H6, out, outOff + 20); - Pack.intToBigEndian(H7, out, outOff + 24); - Pack.intToBigEndian(H8, out, outOff + 28); - - reset(); - - return DIGEST_LENGTH; - } - - /** - * reset the chaining variables - */ - public void reset() - { - super.reset(); - - /* SHA-256 initial hash value - * The first 32 bits of the fractional parts of the square roots - * of the first eight prime numbers - */ - - H1 = 0x6a09e667; - H2 = 0xbb67ae85; - H3 = 0x3c6ef372; - H4 = 0xa54ff53a; - H5 = 0x510e527f; - H6 = 0x9b05688c; - H7 = 0x1f83d9ab; - H8 = 0x5be0cd19; - - xOff = 0; - for (int i = 0; i != X.length; i++) - { - X[i] = 0; - } - } - - protected void processBlock() - { - // - // expand 16 word block into 64 word blocks. - // - for (int t = 16; t <= 63; t++) - { - X[t] = Theta1(X[t - 2]) + X[t - 7] + Theta0(X[t - 15]) + X[t - 16]; - } - - // - // set up working variables. - // - int a = H1; - int b = H2; - int c = H3; - int d = H4; - int e = H5; - int f = H6; - int g = H7; - int h = H8; - - int t = 0; - for(int i = 0; i < 8; i ++) - { - // t = 8 * i - h += Sum1(e) + Ch(e, f, g) + K[t] + X[t]; - d += h; - h += Sum0(a) + Maj(a, b, c); - ++t; - - // t = 8 * i + 1 - g += Sum1(d) + Ch(d, e, f) + K[t] + X[t]; - c += g; - g += Sum0(h) + Maj(h, a, b); - ++t; - - // t = 8 * i + 2 - f += Sum1(c) + Ch(c, d, e) + K[t] + X[t]; - b += f; - f += Sum0(g) + Maj(g, h, a); - ++t; - - // t = 8 * i + 3 - e += Sum1(b) + Ch(b, c, d) + K[t] + X[t]; - a += e; - e += Sum0(f) + Maj(f, g, h); - ++t; - - // t = 8 * i + 4 - d += Sum1(a) + Ch(a, b, c) + K[t] + X[t]; - h += d; - d += Sum0(e) + Maj(e, f, g); - ++t; - - // t = 8 * i + 5 - c += Sum1(h) + Ch(h, a, b) + K[t] + X[t]; - g += c; - c += Sum0(d) + Maj(d, e, f); - ++t; - - // t = 8 * i + 6 - b += Sum1(g) + Ch(g, h, a) + K[t] + X[t]; - f += b; - b += Sum0(c) + Maj(c, d, e); - ++t; - - // t = 8 * i + 7 - a += Sum1(f) + Ch(f, g, h) + K[t] + X[t]; - e += a; - a += Sum0(b) + Maj(b, c, d); - ++t; - } - - H1 += a; - H2 += b; - H3 += c; - H4 += d; - H5 += e; - H6 += f; - H7 += g; - H8 += h; - - // - // reset the offset and clean out the word buffer. - // - xOff = 0; - for (int i = 0; i < 16; i++) - { - X[i] = 0; - } - } - - /* SHA-256 functions */ - private int Ch( - int x, - int y, - int z) - { - return (x & y) ^ ((~x) & z); - } - - private int Maj( - int x, - int y, - int z) - { - return (x & y) ^ (x & z) ^ (y & z); - } - - private int Sum0( - int x) - { - return ((x >>> 2) | (x << 30)) ^ ((x >>> 13) | (x << 19)) ^ ((x >>> 22) | (x << 10)); - } - - private int Sum1( - int x) - { - return ((x >>> 6) | (x << 26)) ^ ((x >>> 11) | (x << 21)) ^ ((x >>> 25) | (x << 7)); - } - - private int Theta0( - int x) - { - return ((x >>> 7) | (x << 25)) ^ ((x >>> 18) | (x << 14)) ^ (x >>> 3); - } - - private int Theta1( - int x) - { - return ((x >>> 17) | (x << 15)) ^ ((x >>> 19) | (x << 13)) ^ (x >>> 10); - } - - /* SHA-256 Constants - * (represent the first 32 bits of the fractional parts of the - * cube roots of the first sixty-four prime numbers) - */ - static final int K[] = { - 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, - 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, - 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, - 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, - 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, - 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, - 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, - 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 - }; - - public Memoable copy() - { - return new SHA256Digest(this); - } - - public void reset(Memoable other) - { - SHA256Digest d = (SHA256Digest)other; - - copyIn(d); - } -} - |