/* * A JavaScript implementation of the Secure Hash Algorithm, SHA-1, as defined * in FIPS PUB 180-1 * Copyright (C) Paul Johnston 2000 - 2002. * See http://pajhome.org.uk/site/legal.html for details. */ /* * Convert a 32-bit number to a hex string with ms-byte first */ var hex_chr = "0123456789abcdef"; function hex(num) { var str = ""; for(var j = 7; j >= 0; j--) str += hex_chr.charAt((num >> (j * 4)) & 0x0F); return str; } /* * Convert a string to a sequence of 16-word blocks, stored as an array. * Append padding bits and the length, as described in the SHA1 standard. */ function str2blks_SHA1(str) { var nblk = ((str.length + 8) >> 6) + 1; var blks = new Array(nblk * 16); for(var i = 0; i < nblk * 16; i++) blks[i] = 0; for(var i = 0; i < str.length; i++) blks[i >> 2] |= str.charCodeAt(i) << (24 - (i % 4) * 8); blks[i >> 2] |= 0x80 << (24 - (i % 4) * 8); blks[nblk * 16 - 1] = str.length * 8; return blks; } /* * Add integers, wrapping at 2^32. This uses 16-bit operations internally * to work around bugs in some JS interpreters. */ function safe_add(x, y) { var lsw = (x & 0xFFFF) + (y & 0xFFFF); var msw = (x >> 16) + (y >> 16) + (lsw >> 16); return (msw << 16) | (lsw & 0xFFFF); } /* * Bitwise rotate a 32-bit number to the left */ function rol(num, cnt) { return (num << cnt) | (num >>> (32 - cnt)); } /* * Perform the appropriate triplet combination function for the current * iteration */ function ft(t, b, c, d) { if(t < 20) return (b & c) | ((~b) & d); if(t < 40) return b ^ c ^ d; if(t < 60) return (b & c) | (b & d) | (c & d); return b ^ c ^ d; } /* * Determine the appropriate additive constant for the current iteration */ function kt(t) { return (t < 20) ? 1518500249 : (t < 40) ? 1859775393 : (t < 60) ? -1894007588 : -899497514; } /* * Take a string and return the hex representation of its SHA-1. */ function calcSHA1(str) { var x = str2blks_SHA1(str); var w = new Array(80); var a = 1732584193; var b = -271733879; var c = -1732584194; var d = 271733878; var e = -1009589776; for(var i = 0; i < x.length; i += 16) { var olda = a; var oldb = b; var oldc = c; var oldd = d; var olde = e; for(var j = 0; j < 80; j++) { if(j < 16) w[j] = x[i + j]; else w[j] = rol(w[j-3] ^ w[j-8] ^ w[j-14] ^ w[j-16], 1); var t = safe_add(safe_add(rol(a, 5), ft(j, b, c, d)), safe_add(safe_add(e, w[j]), kt(j))); e = d; d = c; c = rol(b, 30); b = a; a = t; } a = safe_add(a, olda); b = safe_add(b, oldb); c = safe_add(c, oldc); d = safe_add(d, oldd); e = safe_add(e, olde); } return hex(a) + hex(b) + hex(c) + hex(d) + hex(e); }
java版的MD5
public class MD5 { /* * A Java implementation of the RSA Data Security, Inc. MD5 Message * Digest Algorithm, as defined in RFC 1321. * Based on the JavaScript implementation of Paul Johnston * Copyright (C) Paul Johnston 1999 - 2000. * See http://pajhome.org.uk/site/legal.html for details. * Java Version by Thomas Weber (Orange Interactive GmbH) */ /* * Convert a 32-bit number to a hex string with ls-byte first */ String hex_chr = "0123456789abcdef"; private String rhex(int num) { String str = ""; for(int j = 0; j <= 3; j++) str = str + hex_chr.charAt((num >> (j * 8 + 4)) & 0x0F) + hex_chr.charAt((num >> (j * 8)) & 0x0F); return str; } /* * Convert a string to a sequence of 16-word blocks, stored as an array. * Append padding bits and the length, as described in the MD5 standard. */ private int[] str2blks_MD5(String str) { int nblk = ((str.length() + 8) >> 6) + 1; int[] blks = new int[nblk * 16]; int i = 0; for(i = 0; i < nblk * 16; i++) { blks[i] = 0; } for(i = 0; i < str.length(); i++) { blks[i >> 2] |= str.charAt(i) << ((i % 4) * 8); } blks[i >> 2] |= 0x80 << ((i % 4) * 8); blks[nblk * 16 - 2] = str.length()*8; return blks; } /* * Add integers, wrapping at 2^32 */ private int add(int x, int y) { return ((x&0x7FFFFFFF) + (y&0x7FFFFFFF)) ^ (x&0x80000000) ^ (y&0x80000000); } /* * Bitwise rotate a 32-bit number to the left */ private int rol(int num, int cnt) { return (num << cnt) | (num >>> (32 - cnt)); } /* * These functions implement the basic operation for each round of the * algorithm. */ private int cmn(int q, int a, int b, int x, int s, int t) { return add(rol(add(add(a, q), add(x, t)), s), b); } private int ff(int a, int b, int c, int d, int x, int s, int t) { return cmn((b & c) | ((~b) & d), a, b, x, s, t); } private int gg(int a, int b, int c, int d, int x, int s, int t) { return cmn((b & d) | (c & (~d)), a, b, x, s, t); } private int hh(int a, int b, int c, int d, int x, int s, int t) { return cmn(b ^ c ^ d, a, b, x, s, t); } private int ii(int a, int b, int c, int d, int x, int s, int t) { return cmn(c ^ (b | (~d)), a, b, x, s, t); } /* * Take a string and return the hex representation of its MD5. */ public String calcMD5(String str) { int[] x = str2blks_MD5(str); int a = 0x67452301; int b = 0xEFCDAB89; int c = 0x98BADCFE; int d = 0x10325476; for(int i = 0; i < x.length; i += 16) { int olda = a; int oldb = b; int oldc = c; int oldd = d; a = ff(a, b, c, d, x[i+ 0], 7 , 0xD76AA478); d = ff(d, a, b, c, x[i+ 1], 12, 0xE8C7B756); c = ff(c, d, a, b, x[i+ 2], 17, 0x242070DB); b = ff(b, c, d, a, x[i+ 3], 22, 0xC1BDCEEE); a = ff(a, b, c, d, x[i+ 4], 7 , 0xF57C0FAF); d = ff(d, a, b, c, x[i+ 5], 12, 0x4787C62A); c = ff(c, d, a, b, x[i+ 6], 17, 0xA8304613); b = ff(b, c, d, a, x[i+ 7], 22, 0xFD469501); a = ff(a, b, c, d, x[i+ 8], 7 , 0x698098D8); d = ff(d, a, b, c, x[i+ 9], 12, 0x8B44F7AF); c = ff(c, d, a, b, x[i+10], 17, 0xFFFF5BB1); b = ff(b, c, d, a, x[i+11], 22, 0x895CD7BE); a = ff(a, b, c, d, x[i+12], 7 , 0x6B901122); d = ff(d, a, b, c, x[i+13], 12, 0xFD987193); c = ff(c, d, a, b, x[i+14], 17, 0xA679438E); b = ff(b, c, d, a, x[i+15], 22, 0x49B40821); a = gg(a, b, c, d, x[i+ 1], 5 , 0xF61E2562); d = gg(d, a, b, c, x[i+ 6], 9 , 0xC040B340); c = gg(c, d, a, b, x[i+11], 14, 0x265E5A51); b = gg(b, c, d, a, x[i+ 0], 20, 0xE9B6C7AA); a = gg(a, b, c, d, x[i+ 5], 5 , 0xD62F105D); d = gg(d, a, b, c, x[i+10], 9 , 0x02441453); c = gg(c, d, a, b, x[i+15], 14, 0xD8A1E681); b = gg(b, c, d, a, x[i+ 4], 20, 0xE7D3FBC8); a = gg(a, b, c, d, x[i+ 9], 5 , 0x21E1CDE6); d = gg(d, a, b, c, x[i+14], 9 , 0xC33707D6); c = gg(c, d, a, b, x[i+ 3], 14, 0xF4D50D87); b = gg(b, c, d, a, x[i+ 8], 20, 0x455A14ED); a = gg(a, b, c, d, x[i+13], 5 , 0xA9E3E905); d = gg(d, a, b, c, x[i+ 2], 9 , 0xFCEFA3F8); c = gg(c, d, a, b, x[i+ 7], 14, 0x676F02D9); b = gg(b, c, d, a, x[i+12], 20, 0x8D2A4C8A); a = hh(a, b, c, d, x[i+ 5], 4 , 0xFFFA3942); d = hh(d, a, b, c, x[i+ 8], 11, 0x8771F681); c = hh(c, d, a, b, x[i+11], 16, 0x6D9D6122); b = hh(b, c, d, a, x[i+14], 23, 0xFDE5380C); a = hh(a, b, c, d, x[i+ 1], 4 , 0xA4BEEA44); d = hh(d, a, b, c, x[i+ 4], 11, 0x4BDECFA9); c = hh(c, d, a, b, x[i+ 7], 16, 0xF6BB4B60); b = hh(b, c, d, a, x[i+10], 23, 0xBEBFBC70); a = hh(a, b, c, d, x[i+13], 4 , 0x289B7EC6); d = hh(d, a, b, c, x[i+ 0], 11, 0xEAA127FA); c = hh(c, d, a, b, x[i+ 3], 16, 0xD4EF3085); b = hh(b, c, d, a, x[i+ 6], 23, 0x04881D05); a = hh(a, b, c, d, x[i+ 9], 4 , 0xD9D4D039); d = hh(d, a, b, c, x[i+12], 11, 0xE6DB99E5); c = hh(c, d, a, b, x[i+15], 16, 0x1FA27CF8); b = hh(b, c, d, a, x[i+ 2], 23, 0xC4AC5665); a = ii(a, b, c, d, x[i+ 0], 6 , 0xF4292244); d = ii(d, a, b, c, x[i+ 7], 10, 0x432AFF97); c = ii(c, d, a, b, x[i+14], 15, 0xAB9423A7); b = ii(b, c, d, a, x[i+ 5], 21, 0xFC93A039); a = ii(a, b, c, d, x[i+12], 6 , 0x655B59C3); d = ii(d, a, b, c, x[i+ 3], 10, 0x8F0CCC92); c = ii(c, d, a, b, x[i+10], 15, 0xFFEFF47D); b = ii(b, c, d, a, x[i+ 1], 21, 0x85845DD1); a = ii(a, b, c, d, x[i+ 8], 6 , 0x6FA87E4F); d = ii(d, a, b, c, x[i+15], 10, 0xFE2CE6E0); c = ii(c, d, a, b, x[i+ 6], 15, 0xA3014314); b = ii(b, c, d, a, x[i+13], 21, 0x4E0811A1); a = ii(a, b, c, d, x[i+ 4], 6 , 0xF7537E82); d = ii(d, a, b, c, x[i+11], 10, 0xBD3AF235); c = ii(c, d, a, b, x[i+ 2], 15, 0x2AD7D2BB); b = ii(b, c, d, a, x[i+ 9], 21, 0xEB86D391); a = add(a, olda); b = add(b, oldb); c = add(c, oldc); d = add(d, oldd); } return rhex(a) + rhex(b) + rhex(c) + rhex(d); } }
上面是算法的实现代码,不过我们真正用的时候当然不需要那么复杂了,jdk里面早就有了高效的算法实现: package myreuse.common.util; import sun.misc.BASE64Encoder; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; public abstract class MessageDigester { static MessageDigest SHA1 ; static MessageDigest MD5 ; static { try{ SHA1 = MessageDigest.getInstance("SHA1"); MD5 = MessageDigest.getInstance("MD5"); } catch (NoSuchAlgorithmException e){ e.printStackTrace(); } } public static byte[] SHA1(String msg) { return SHA1.digest(msg.getBytes()); } public static byte[] MD5(String msg) { return MD5.digest(msg.getBytes()); } private static BASE64Encoder bASE64Encoder = new BASE64Encoder(); public static String hex(byte[] b) { StringBuffer result = new StringBuffer(b.length); for (int i = 0; i < b.length; i++) result.append(Integer.toHexString(0xff & b[i])); return result.toString(); } public static String base64(byte[] b) { String result = bASE64Encoder.encode(b); int i = result.indexOf('='); if (i>-1) result = result.substring(0,i); return result; } public static String base64SHA1(String msg) { return base64(SHA1(msg)); } public static String base64MD5(String msg) { return base64(MD5(msg)); } public static String hexSHA1(String msg) { return hex(SHA1(msg)); } public static String hexMD5(String msg) { return hex(MD5(msg)); } }
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