| package org.bouncycastle.util; |
| |
| /** |
| * Utility methods for converting byte arrays into ints and longs, and back again. |
| */ |
| public abstract class Pack |
| { |
| public static short bigEndianToShort(byte[] bs, int off) |
| { |
| int n = (bs[off] & 0xff) << 8; |
| n |= (bs[++off] & 0xff); |
| return (short)n; |
| } |
| |
| public static int bigEndianToInt(byte[] bs, int off) |
| { |
| int n = bs[off] << 24; |
| n |= (bs[++off] & 0xff) << 16; |
| n |= (bs[++off] & 0xff) << 8; |
| n |= (bs[++off] & 0xff); |
| return n; |
| } |
| |
| public static void bigEndianToInt(byte[] bs, int off, int[] ns) |
| { |
| for (int i = 0; i < ns.length; ++i) |
| { |
| ns[i] = bigEndianToInt(bs, off); |
| off += 4; |
| } |
| } |
| |
| public static void bigEndianToInt(byte[] bs, int off, int[] ns, int nsOff, int nsLen) |
| { |
| for (int i = 0; i < nsLen; ++i) |
| { |
| ns[nsOff + i] = bigEndianToInt(bs, off); |
| off += 4; |
| } |
| } |
| |
| public static byte[] intToBigEndian(int n) |
| { |
| byte[] bs = new byte[4]; |
| intToBigEndian(n, bs, 0); |
| return bs; |
| } |
| |
| public static void intToBigEndian(int n, byte[] bs, int off) |
| { |
| bs[off] = (byte)(n >>> 24); |
| bs[++off] = (byte)(n >>> 16); |
| bs[++off] = (byte)(n >>> 8); |
| bs[++off] = (byte)(n); |
| } |
| |
| public static byte[] intToBigEndian(int[] ns) |
| { |
| byte[] bs = new byte[4 * ns.length]; |
| intToBigEndian(ns, bs, 0); |
| return bs; |
| } |
| |
| public static void intToBigEndian(int[] ns, byte[] bs, int off) |
| { |
| for (int i = 0; i < ns.length; ++i) |
| { |
| intToBigEndian(ns[i], bs, off); |
| off += 4; |
| } |
| } |
| |
| public static void intToBigEndian(int[] ns, int nsOff, int nsLen, byte[] bs, int bsOff) |
| { |
| for (int i = 0; i < nsLen; ++i) |
| { |
| intToBigEndian(ns[nsOff + i], bs, bsOff); |
| bsOff += 4; |
| } |
| } |
| |
| public static long bigEndianToLong(byte[] bs, int off) |
| { |
| int hi = bigEndianToInt(bs, off); |
| int lo = bigEndianToInt(bs, off + 4); |
| return ((long)(hi & 0xffffffffL) << 32) | (long)(lo & 0xffffffffL); |
| } |
| |
| public static void bigEndianToLong(byte[] bs, int off, long[] ns) |
| { |
| for (int i = 0; i < ns.length; ++i) |
| { |
| ns[i] = bigEndianToLong(bs, off); |
| off += 8; |
| } |
| } |
| |
| public static void bigEndianToLong(byte[] bs, int bsOff, long[] ns, int nsOff, int nsLen) |
| { |
| for (int i = 0; i < nsLen; ++i) |
| { |
| ns[nsOff + i] = bigEndianToLong(bs, bsOff); |
| bsOff += 8; |
| } |
| } |
| |
| public static byte[] longToBigEndian(long n) |
| { |
| byte[] bs = new byte[8]; |
| longToBigEndian(n, bs, 0); |
| return bs; |
| } |
| |
| public static void longToBigEndian(long n, byte[] bs, int off) |
| { |
| intToBigEndian((int)(n >>> 32), bs, off); |
| intToBigEndian((int)(n & 0xffffffffL), bs, off + 4); |
| } |
| |
| public static byte[] longToBigEndian(long[] ns) |
| { |
| byte[] bs = new byte[8 * ns.length]; |
| longToBigEndian(ns, bs, 0); |
| return bs; |
| } |
| |
| public static void longToBigEndian(long[] ns, byte[] bs, int off) |
| { |
| for (int i = 0; i < ns.length; ++i) |
| { |
| longToBigEndian(ns[i], bs, off); |
| off += 8; |
| } |
| } |
| |
| public static void longToBigEndian(long[] ns, int nsOff, int nsLen, byte[] bs, int bsOff) |
| { |
| for (int i = 0; i < nsLen; ++i) |
| { |
| longToBigEndian(ns[nsOff + i], bs, bsOff); |
| bsOff += 8; |
| } |
| } |
| |
| /** |
| * @param value The number |
| * @param bs The target. |
| * @param off Position in target to start. |
| * @param bytes number of bytes to write. |
| * |
| * @deprecated Will be removed |
| */ |
| public static void longToBigEndian(long value, byte[] bs, int off, int bytes) |
| { |
| for (int i = bytes - 1; i >= 0; i--) |
| { |
| bs[i + off] = (byte)(value & 0xff); |
| value >>>= 8; |
| } |
| } |
| |
| public static short littleEndianToShort(byte[] bs, int off) |
| { |
| int n = bs[off] & 0xff; |
| n |= (bs[++off] & 0xff) << 8; |
| return (short)n; |
| } |
| |
| public static int littleEndianToInt(byte[] bs, int off) |
| { |
| int n = bs[off] & 0xff; |
| n |= (bs[++off] & 0xff) << 8; |
| n |= (bs[++off] & 0xff) << 16; |
| n |= bs[++off] << 24; |
| return n; |
| } |
| |
| public static void littleEndianToInt(byte[] bs, int off, int[] ns) |
| { |
| for (int i = 0; i < ns.length; ++i) |
| { |
| ns[i] = littleEndianToInt(bs, off); |
| off += 4; |
| } |
| } |
| |
| public static void littleEndianToInt(byte[] bs, int bOff, int[] ns, int nOff, int count) |
| { |
| for (int i = 0; i < count; ++i) |
| { |
| ns[nOff + i] = littleEndianToInt(bs, bOff); |
| bOff += 4; |
| } |
| } |
| |
| public static int[] littleEndianToInt(byte[] bs, int off, int count) |
| { |
| int[] ns = new int[count]; |
| for (int i = 0; i < ns.length; ++i) |
| { |
| ns[i] = littleEndianToInt(bs, off); |
| off += 4; |
| } |
| return ns; |
| } |
| |
| public static byte[] shortToLittleEndian(short n) |
| { |
| byte[] bs = new byte[2]; |
| shortToLittleEndian(n, bs, 0); |
| return bs; |
| } |
| |
| public static void shortToLittleEndian(short n, byte[] bs, int off) |
| { |
| bs[off] = (byte)(n); |
| bs[++off] = (byte)(n >>> 8); |
| } |
| |
| |
| public static byte[] shortToBigEndian(short n) |
| { |
| byte[] r = new byte[2]; |
| shortToBigEndian(n, r, 0); |
| return r; |
| } |
| |
| public static void shortToBigEndian(short n, byte[] bs, int off) |
| { |
| bs[off] = (byte)(n >>> 8); |
| bs[++off] = (byte)(n); |
| } |
| |
| |
| public static byte[] intToLittleEndian(int n) |
| { |
| byte[] bs = new byte[4]; |
| intToLittleEndian(n, bs, 0); |
| return bs; |
| } |
| |
| public static void intToLittleEndian(int n, byte[] bs, int off) |
| { |
| bs[off] = (byte)(n); |
| bs[++off] = (byte)(n >>> 8); |
| bs[++off] = (byte)(n >>> 16); |
| bs[++off] = (byte)(n >>> 24); |
| } |
| |
| public static byte[] intToLittleEndian(int[] ns) |
| { |
| byte[] bs = new byte[4 * ns.length]; |
| intToLittleEndian(ns, bs, 0); |
| return bs; |
| } |
| |
| public static void intToLittleEndian(int[] ns, byte[] bs, int off) |
| { |
| for (int i = 0; i < ns.length; ++i) |
| { |
| intToLittleEndian(ns[i], bs, off); |
| off += 4; |
| } |
| } |
| |
| public static void intToLittleEndian(int[] ns, int nsOff, int nsLen, byte[] bs, int bsOff) |
| { |
| for (int i = 0; i < nsLen; ++i) |
| { |
| intToLittleEndian(ns[nsOff + i], bs, bsOff); |
| bsOff += 4; |
| } |
| } |
| |
| public static long littleEndianToLong(byte[] bs, int off) |
| { |
| int lo = littleEndianToInt(bs, off); |
| int hi = littleEndianToInt(bs, off + 4); |
| return ((long)(hi & 0xffffffffL) << 32) | (long)(lo & 0xffffffffL); |
| } |
| |
| public static void littleEndianToLong(byte[] bs, int off, long[] ns) |
| { |
| for (int i = 0; i < ns.length; ++i) |
| { |
| ns[i] = littleEndianToLong(bs, off); |
| off += 8; |
| } |
| } |
| |
| public static void littleEndianToLong(byte[] bs, int bsOff, long[] ns, int nsOff, int nsLen) |
| { |
| for (int i = 0; i < nsLen; ++i) |
| { |
| ns[nsOff + i] = littleEndianToLong(bs, bsOff); |
| bsOff += 8; |
| } |
| } |
| |
| public static byte[] longToLittleEndian(long n) |
| { |
| byte[] bs = new byte[8]; |
| longToLittleEndian(n, bs, 0); |
| return bs; |
| } |
| |
| public static void longToLittleEndian(long n, byte[] bs, int off) |
| { |
| intToLittleEndian((int)(n & 0xffffffffL), bs, off); |
| intToLittleEndian((int)(n >>> 32), bs, off + 4); |
| } |
| |
| public static byte[] longToLittleEndian(long[] ns) |
| { |
| byte[] bs = new byte[8 * ns.length]; |
| longToLittleEndian(ns, bs, 0); |
| return bs; |
| } |
| |
| public static void longToLittleEndian(long[] ns, byte[] bs, int off) |
| { |
| for (int i = 0; i < ns.length; ++i) |
| { |
| longToLittleEndian(ns[i], bs, off); |
| off += 8; |
| } |
| } |
| |
| public static void longToLittleEndian(long[] ns, int nsOff, int nsLen, byte[] bs, int bsOff) |
| { |
| for (int i = 0; i < nsLen; ++i) |
| { |
| longToLittleEndian(ns[nsOff + i], bs, bsOff); |
| bsOff += 8; |
| } |
| } |
| } |