001: /*
002: * Copyright 2004-2008 H2 Group. Licensed under the H2 License, Version 1.0
003: * (http://h2database.com/html/license.html).
004: * Initial Developer: H2 Group
005: */
006: package org.h2.security;
007:
008: import java.util.Arrays;
009:
010: /**
011: * This class implements the cryptographic hash function SHA-256.
012: */
013: public class SHA256 {
014:
015: // TODO maybe implement WHIRLPOOL
016:
017: public byte[] getHashWithSalt(byte[] data, byte[] salt) {
018: byte[] buff = new byte[data.length + salt.length];
019: System.arraycopy(data, 0, buff, 0, data.length);
020: System.arraycopy(salt, 0, buff, data.length, salt.length);
021: return getHash(buff);
022: }
023:
024: public byte[] getKeyPasswordHash(String userName, char[] password) {
025: String user = userName + "@";
026: byte[] buff = new byte[2 * (user.length() + password.length)];
027: int n = 0;
028: for (int i = 0; i < user.length(); i++) {
029: char c = user.charAt(i);
030: buff[n++] = (byte) (c >> 8);
031: buff[n++] = (byte) (c);
032: }
033: for (int i = 0; i < password.length; i++) {
034: char c = password[i];
035: buff[n++] = (byte) (c >> 8);
036: buff[n++] = (byte) (c);
037: }
038: Arrays.fill(password, (char) 0);
039: return getHash(buff);
040: }
041:
042: // The first 32 bits of the fractional parts of the cube roots of the first
043: // sixty-four prime numbers
044: private static final int[] K = { 0x428a2f98, 0x71374491,
045: 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4,
046: 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
047: 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1,
048: 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa,
049: 0x5cb0a9dc, 0x76f988da, 0x983e5152, 0xa831c66d, 0xb00327c8,
050: 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
051: 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354,
052: 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b,
053: 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585,
054: 0x106aa070, 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
055: 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, 0x748f82ee,
056: 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb,
057: 0xbef9a3f7, 0xc67178f2 };
058:
059: public byte[] getHash(byte[] data) {
060: int byteLen = data.length;
061: int intLen = ((byteLen + 9 + 63) / 64) * 16;
062: byte[] bytes = new byte[intLen * 4];
063: System.arraycopy(data, 0, bytes, 0, byteLen);
064: bytes[byteLen] = (byte) 0x80;
065: int[] buff = new int[intLen];
066: for (int i = 0, j = 0; j < intLen; i += 4, j++) {
067: buff[j] = readInt(bytes, i);
068: }
069: buff[intLen - 2] = byteLen >>> 29;
070: buff[intLen - 1] = (byteLen << 3) & 0xffffffff;
071: int[] w = new int[64];
072: int[] hh = new int[] { 0x6a09e667, 0xbb67ae85, 0x3c6ef372,
073: 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab,
074: 0x5be0cd19 };
075:
076: for (int block = 0; block < intLen; block += 16) {
077: for (int i = 0; i < 16; i++) {
078: w[i] = buff[block + i];
079: }
080: for (int i = 16; i < 64; i++) {
081: int x = w[i - 2];
082: int theta1 = rot(x, 17) ^ rot(x, 19) ^ (x >>> 10);
083: x = w[i - 15];
084: int theta0 = rot(x, 7) ^ rot(x, 18) ^ (x >>> 3);
085: w[i] = theta1 + w[i - 7] + theta0 + w[i - 16];
086: }
087:
088: int a = hh[0], b = hh[1], c = hh[2], d = hh[3];
089: int e = hh[4], f = hh[5], g = hh[6], h = hh[7];
090:
091: for (int i = 0; i < 64; i++) {
092: int t1 = h + (rot(e, 6) ^ rot(e, 11) ^ rot(e, 25))
093: + ((e & f) ^ ((~e) & g)) + K[i] + w[i];
094: int t2 = (rot(a, 2) ^ rot(a, 13) ^ rot(a, 22))
095: + ((a & b) ^ (a & c) ^ (b & c));
096: h = g;
097: g = f;
098: f = e;
099: e = d + t1;
100: d = c;
101: c = b;
102: b = a;
103: a = t1 + t2;
104: }
105: hh[0] += a;
106: hh[1] += b;
107: hh[2] += c;
108: hh[3] += d;
109: hh[4] += e;
110: hh[5] += f;
111: hh[6] += g;
112: hh[7] += h;
113: }
114: byte[] result = new byte[32];
115: for (int i = 0; i < 8; i++) {
116: writeInt(result, i * 4, hh[i]);
117: }
118: Arrays.fill(w, 0);
119: Arrays.fill(buff, 0);
120: Arrays.fill(hh, 0);
121: Arrays.fill(bytes, (byte) 0);
122: return result;
123: }
124:
125: private int rot(int i, int count) {
126: return (i << (32 - count)) | (i >>> count);
127: }
128:
129: private int readInt(byte[] b, int i) {
130: return ((b[i] & 0xff) << 24) + ((b[i + 1] & 0xff) << 16)
131: + ((b[i + 2] & 0xff) << 8) + (b[i + 3] & 0xff);
132: }
133:
134: private void writeInt(byte[] b, int i, int value) {
135: b[i] = (byte) (value >> 24);
136: b[i + 1] = (byte) (value >> 16);
137: b[i + 2] = (byte) (value >> 8);
138: b[i + 3] = (byte) value;
139: }
140:
141: }
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