http://snippets.dzone.com/posts Thu, 28 Aug 2008 21:02:14 GMT DZone Snippets: shift code http://snippets.dzone.com/posts/show/4593 Handy to convert MD5 or SHA-1 hash values. <br /> <br /><code> <br /> public static long hexToLong(byte[] bytes) { <br /> <br /> if (bytes.length > 16) { <br /> throw new IllegalArgumentException("Byte array too long (max 16 elements)"); <br /> } <br /> long v = 0; <br /> for (int i = 0; i < bytes.length; i += 2) { <br /> byte b1 = (byte) (bytes[i] & 0xFF); <br /> <br /> b1 -= 48; <br /> if (b1 > 9) b1 -= 39; <br /> <br /> if (b1 < 0 || b1 > 15) { <br /> throw new IllegalArgumentException("Illegal hex value: " + bytes[i]); <br /> } <br /> <br /> b1 <<=4; <br /> <br /> byte b2 = (byte) (bytes[i + 1] & 0xFF); <br /> b2 -= 48; <br /> if (b2 > 9) b2 -= 39; <br /> <br /> if (b2 < 0 || b2 > 15) { <br /> throw new IllegalArgumentException("Illegal hex value: " + bytes[i + 1]); <br /> } <br /> <br /> v |= (((b1 & 0xF0) | (b2 & 0x0F))) & 0x00000000000000FFL ; <br /> <br /> if (i + 2 < bytes.length) v <<= 8; <br /> } <br /> <br /> return v; <br /> } <br /> <br /> public static byte[] longToHex(final long l) { <br /> long v = l & 0xFFFFFFFFFFFFFFFFL; <br /> <br /> byte[] result = new byte[16]; <br /> Arrays.fill(result, 0, result.length, (byte)0); <br /> <br /> for (int i = 0; i < result.length; i += 2) { <br /> byte b = (byte) ((v & 0xFF00000000000000L) >> 56); <br /> <br /> byte b2 = (byte) (b & 0x0F); <br /> byte b1 = (byte) ((b >> 4) & 0x0F); <br /> <br /> if (b1 > 9) b1 += 39; <br /> b1 += 48; <br /> <br /> if (b2 > 9) b2 += 39; <br /> b2 += 48; <br /> <br /> result[i] = (byte) (b1 & 0xFF); <br /> result[i + 1] = (byte) (b2 & 0xFF); <br /> <br /> v <<= 8; <br /> } <br /> <br /> return result; <br /> } <br /> <br /></code> <br /> <br />And tests: <br /> <br /><code> <br /> public void testHexToLong() throws Exception { <br /> assertEquals(-7057002501900618110L, NumberUtils.hexToLong("9e107d9d372bb682".getBytes())); <br /> assertEquals(-10908158098650842L, NumberUtils.hexToLong("ffd93f1687604926".getBytes())); <br /> } <br /> <br /> public void testLongToHex() throws Exception { <br /> assertEquals("9e107d9d372bb682", new String(NumberUtils.longToHex(-7057002501900618110L))); <br /> assertEquals("ffd93f1687604926", new String(NumberUtils.longToHex(-10908158098650842L))); <br /> } <br /></code> Sun, 30 Sep 2007 23:30:01 GMT http://snippets.dzone.com/posts/show/4593 devijvers (Steven Devijver)