生成MD5碼----密碼加密

/* to convert strings to a list of ascii values */ var sAscii = " !/"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ" var sAscii = sAscii + "[//]^_`abcdefghijklmnopqrstuvwxyz{|}~"; /* convert integer to hex string */ var sHex = "0123456789ABCDEF"; function hex(i) { h = ""; for(j = 0; j <= 3; j++) { h += sHex.charAt((i >> (j * 8 + 4)) & 0x0F) + sHex.charAt((i >> (j * 8)) & 0x0F); } return h; } /* add, handling overflows correctly */ function add(x, y) { return ((x&0x7FFFFFFF) + (y&0x7FFFFFFF)) ^ (x&0x80000000) ^ (y&0x80000000); } /* MD5 rounds functions */ function R1(A, B, C, D, X, S, T) { q = add(add(A, (B & C) | (~B & D)), add(X, T)); return add((q << S) | ((q >> (32 - S)) & (Math.pow(2, S) - 1)), B); } function R2(A, B, C, D, X, S, T) { q = add(add(A, (B & D) | (C & ~D)), add(X, T)); return add((q << S) | ((q >> (32 - S)) & (Math.pow(2, S) - 1)), B); } function R3(A, B, C, D, X, S, T) { q = add(add(A, B ^ C ^ D), add(X, T)); return add((q << S) | ((q >> (32 - S)) & (Math.pow(2, S) - 1)), B); } function R4(A, B, C, D, X, S, T) { q = add(add(A, C ^ (B | ~D)), add(X, T)); return add((q << S) | ((q >> (32 - S)) & (Math.pow(2, S) - 1)), B); } /* main entry point */ function calcMD5(sInp) { /* Calculate length in machine words, including padding */ wLen = (((sInp.length + 8) >> 6) + 1) << 4; var X = new Array(wLen); /* Convert string to array of words */ j = 4; for (i = 0; (i * 4) < sInp.length; i++) { X[i] = 0; for (j = 0; (j < 4) && ((j + i * 4) < sInp.length); j++) { X[i] += (sAscii.indexOf(sInp.charAt((i * 4) + j)) + 32) << (j * 8); } } /* Append padding bits and length */ if (j == 4) { X[i++] = 0x80; } else { X[i - 1] += 0x80 << (j * 8); } for(; i < wLen; i++) { X[i] = 0; } X[wLen - 2] = sInp.length * 8; /* hard-coded initial values */ a = 0x67452301; b = 0xefcdab89; c = 0x98badcfe; d = 0x10325476; /* Process each 16-word block in turn */ for (i = 0; i < wLen; i += 16) { aO = a; bO = b; cO = c; dO = d; a = R1(a, b, c, d, X[i+ 0], 7 , 0xd76aa478); d = R1(d, a, b, c, X[i+ 1], 12, 0xe8c7b756); c = R1(c, d, a, b, X[i+ 2], 17, 0x242070db); b = R1(b, c, d, a, X[i+ 3], 22, 0xc1bdceee); a = R1(a, b, c, d, X[i+ 4], 7 , 0xf57c0faf); d = R1(d, a, b, c, X[i+ 5], 12, 0x4787c62a); c = R1(c, d, a, b, X[i+ 6], 17, 0xa8304613); b = R1(b, c, d, a, X[i+ 7], 22, 0xfd469501); a = R1(a, b, c, d, X[i+ 8], 7 , 0x698098d8); d = R1(d, a, b, c, X[i+ 9], 12, 0x8b44f7af); c = R1(c, d, a, b, X[i+10], 17, 0xffff5bb1); b = R1(b, c, d, a, X[i+11], 22, 0x895cd7be); a = R1(a, b, c, d, X[i+12], 7 , 0x6b901122); d = R1(d, a, b, c, X[i+13], 12, 0xfd987193); c = R1(c, d, a, b, X[i+14], 17, 0xa679438e); b = R1(b, c, d, a, X[i+15], 22, 0x49b40821); a = R2(a, b, c, d, X[i+ 1], 5 , 0xf61e2562); d = R2(d, a, b, c, X[i+ 6], 9 , 0xc040b340); c = R2(c, d, a, b, X[i+11], 14, 0x265e5a51); b = R2(b, c, d, a, X[i+ 0], 20, 0xe9b6c7aa); a = R2(a, b, c, d, X[i+ 5], 5 , 0xd62f105d); d = R2(d, a, b, c, X[i+10], 9 , 0x2441453); c = R2(c, d, a, b, X[i+15], 14, 0xd8a1e681); b = R2(b, c, d, a, X[i+ 4], 20, 0xe7d3fbc8); a = R2(a, b, c, d, X[i+ 9], 5 , 0x21e1cde6); d = R2(d, a, b, c, X[i+14], 9 , 0xc33707d6); c = R2(c, d, a, b, X[i+ 3], 14, 0xf4d50d87); b = R2(b, c, d, a, X[i+ 8], 20, 0x455a14ed); a = R2(a, b, c, d, X[i+13], 5 , 0xa9e3e905); d = R2(d, a, b, c, X[i+ 2], 9 , 0xfcefa3f8); c = R2(c, d, a, b, X[i+ 7], 14, 0x676f02d9); b = R2(b, c, d, a, X[i+12], 20, 0x8d2a4c8a); a = R3(a, b, c, d, X[i+ 5], 4 , 0xfffa3942); d = R3(d, a, b, c, X[i+ 8], 11, 0x8771f681); c = R3(c, d, a, b, X[i+11], 16, 0x6d9d6122); b = R3(b, c, d, a, X[i+14], 23, 0xfde5380c); a = R3(a, b, c, d, X[i+ 1], 4 , 0xa4beea44); d = R3(d, a, b, c, X[i+ 4], 11, 0x4bdecfa9); c = R3(c, d, a, b, X[i+ 7], 16, 0xf6bb4b60); b = R3(b, c, d, a, X[i+10], 23, 0xbebfbc70); a = R3(a, b, c, d, X[i+13], 4 , 0x289b7ec6); d = R3(d, a, b, c, X[i+ 0], 11, 0xeaa127fa); c = R3(c, d, a, b, X[i+ 3], 16, 0xd4ef3085); b = R3(b, c, d, a, X[i+ 6], 23, 0x4881d05); a = R3(a, b, c, d, X[i+ 9], 4 , 0xd9d4d039); d = R3(d, a, b, c, X[i+12], 11, 0xe6db99e5); c = R3(c, d, a, b, X[i+15], 16, 0x1fa27cf8); b = R3(b, c, d, a, X[i+ 2], 23, 0xc4ac5665); a = R4(a, b, c, d, X[i+ 0], 6 , 0xf4292244); d = R4(d, a, b, c, X[i+ 7], 10, 0x432aff97); c = R4(c, d, a, b, X[i+14], 15, 0xab9423a7); b = R4(b, c, d, a, X[i+ 5], 21, 0xfc93a039); a = R4(a, b, c, d, X[i+12], 6 , 0x655b59c3); d = R4(d, a, b, c, X[i+ 3], 10, 0x8f0ccc92); c = R4(c, d, a, b, X[i+10], 15, 0xffeff47d); b = R4(b, c, d, a, X[i+ 1], 21, 0x85845dd1); a = R4(a, b, c, d, X[i+ 8], 6 , 0x6fa87e4f); d = R4(d, a, b, c, X[i+15], 10, 0xfe2ce6e0); c = R4(c, d, a, b, X[i+ 6], 15, 0xa3014314); b = R4(b, c, d, a, X[i+13], 21, 0x4e0811a1); a = R4(a, b, c, d, X[i+ 4], 6 , 0xf7537e82); d = R4(d, a, b, c, X[i+11], 10, 0xbd3af235); c = R4(c, d, a, b, X[i+ 2], 15, 0x2ad7d2bb); b = R4(b, c, d, a, X[i+ 9], 21, 0xeb86d391); a = add(a, aO); b = add(b, bO); c = add(c, cO); d = add(d, dO); } return hex(a) + hex(b) + hex(c) + hex(d); }