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1
10 package org.mmbase.util.transformers;
11
12
20
21 public class MD5 extends StringTransformer implements CharTransformer {
22 private final static String  ENCODING = "MD5";
23 private MD5Implementation transformer = new MD5Implementation();
24
25 public String toString() {
26 return ENCODING;
27 }
28
29 public String transform(String r) {
30 return transformer.calcMD5(r);
31 }
32
33 public String transformBack(String w) {
34 throw new UnsupportedOperationException ("transformBack(String) can never be done for MD5(i hope so :p)");
35 }
36
37 class MD5Implementation {
40
48
49
52 String hex_chr = "0123456789abcdef";
53 private String rhex(int num) {
54 String str = "";
55 for (int j = 0; j <= 3; j++)
56 str = str + hex_chr.charAt((num >> (j * 8 + 4)) & 0x0F) + hex_chr.charAt((num >> (j * 8)) & 0x0F);
57 return str;
58 }
59
60
64 private int[] str2blks_MD5(String str) {
65 int nblk = ((str.length() + 8) >> 6) + 1;
66 int[] blks = new int[nblk * 16];
67 int i = 0;
68 for (i = 0; i < nblk * 16; i++) {
69 blks[i] = 0;
70 }
71 for (i = 0; i < str.length(); i++) {
72 blks[i >> 2] |= str.charAt(i) << ((i % 4) * 8);
73 }
74 blks[i >> 2] |= 0x80 << ((i % 4) * 8);
75 blks[nblk * 16 - 2] = str.length() * 8;
76
77 return blks;
78 }
79
80
83 private int add(int x, int y) {
84 return ((x & 0x7FFFFFFF) + (y & 0x7FFFFFFF)) ^ (x & 0x80000000) ^ (y & 0x80000000);
85 }
86
87
90 private int rol(int num, int cnt) {
91 return (num << cnt) | (num >>> (32 - cnt));
92 }
93
94
98 private int cmn(int q, int a, int b, int x, int s, int t) {
99 return add(rol(add(add(a, q), add(x, t)), s), b);
100 }
101 private int ff(int a, int b, int c, int d, int x, int s, int t) {
102 return cmn((b & c) | ((~b) & d), a, b, x, s, t);
103 }
104 private int gg(int a, int b, int c, int d, int x, int s, int t) {
105 return cmn((b & d) | (c & (~d)), a, b, x, s, t);
106 }
107 private int hh(int a, int b, int c, int d, int x, int s, int t) {
108 return cmn(b ^ c ^ d, a, b, x, s, t);
109 }
110 private int ii(int a, int b, int c, int d, int x, int s, int t) {
111 return cmn(c ^ (b | (~d)), a, b, x, s, t);
112 }
113
114
117 public String calcMD5(String str) {
118 int[] x = str2blks_MD5(str);
119 int a = 0x67452301;
120 int b = 0xEFCDAB89;
121 int c = 0x98BADCFE;
122 int d = 0x10325476;
123
124 for (int i = 0; i < x.length; i += 16) {
125 int olda = a;
126 int oldb = b;
127 int oldc = c;
128 int oldd = d;
129
130 a = ff(a, b, c, d, x[i + 0], 7, 0xD76AA478);
131 d = ff(d, a, b, c, x[i + 1], 12, 0xE8C7B756);
132 c = ff(c, d, a, b, x[i + 2], 17, 0x242070DB);
133 b = ff(b, c, d, a, x[i + 3], 22, 0xC1BDCEEE);
134 a = ff(a, b, c, d, x[i + 4], 7, 0xF57C0FAF);
135 d = ff(d, a, b, c, x[i + 5], 12, 0x4787C62A);
136 c = ff(c, d, a, b, x[i + 6], 17, 0xA8304613);
137 b = ff(b, c, d, a, x[i + 7], 22, 0xFD469501);
138 a = ff(a, b, c, d, x[i + 8], 7, 0x698098D8);
139 d = ff(d, a, b, c, x[i + 9], 12, 0x8B44F7AF);
140 c = ff(c, d, a, b, x[i + 10], 17, 0xFFFF5BB1);
141 b = ff(b, c, d, a, x[i + 11], 22, 0x895CD7BE);
142 a = ff(a, b, c, d, x[i + 12], 7, 0x6B901122);
143 d = ff(d, a, b, c, x[i + 13], 12, 0xFD987193);
144 c = ff(c, d, a, b, x[i + 14], 17, 0xA679438E);
145 b = ff(b, c, d, a, x[i + 15], 22, 0x49B40821);
146
147 a = gg(a, b, c, d, x[i + 1], 5, 0xF61E2562);
148 d = gg(d, a, b, c, x[i + 6], 9, 0xC040B340);
149 c = gg(c, d, a, b, x[i + 11], 14, 0x265E5A51);
150 b = gg(b, c, d, a, x[i + 0], 20, 0xE9B6C7AA);
151 a = gg(a, b, c, d, x[i + 5], 5, 0xD62F105D);
152 d = gg(d, a, b, c, x[i + 10], 9, 0x02441453);
153 c = gg(c, d, a, b, x[i + 15], 14, 0xD8A1E681);
154 b = gg(b, c, d, a, x[i + 4], 20, 0xE7D3FBC8);
155 a = gg(a, b, c, d, x[i + 9], 5, 0x21E1CDE6);
156 d = gg(d, a, b, c, x[i + 14], 9, 0xC33707D6);
157 c = gg(c, d, a, b, x[i + 3], 14, 0xF4D50D87);
158 b = gg(b, c, d, a, x[i + 8], 20, 0x455A14ED);
159 a = gg(a, b, c, d, x[i + 13], 5, 0xA9E3E905);
160 d = gg(d, a, b, c, x[i + 2], 9, 0xFCEFA3F8);
161 c = gg(c, d, a, b, x[i + 7], 14, 0x676F02D9);
162 b = gg(b, c, d, a, x[i + 12], 20, 0x8D2A4C8A);
163
164 a = hh(a, b, c, d, x[i + 5], 4, 0xFFFA3942);
165 d = hh(d, a, b, c, x[i + 8], 11, 0x8771F681);
166 c = hh(c, d, a, b, x[i + 11], 16, 0x6D9D6122);
167 b = hh(b, c, d, a, x[i + 14], 23, 0xFDE5380C);
168 a = hh(a, b, c, d, x[i + 1], 4, 0xA4BEEA44);
169 d = hh(d, a, b, c, x[i + 4], 11, 0x4BDECFA9);
170 c = hh(c, d, a, b, x[i + 7], 16, 0xF6BB4B60);
171 b = hh(b, c, d, a, x[i + 10], 23, 0xBEBFBC70);
172 a = hh(a, b, c, d, x[i + 13], 4, 0x289B7EC6);
173 d = hh(d, a, b, c, x[i + 0], 11, 0xEAA127FA);
174 c = hh(c, d, a, b, x[i + 3], 16, 0xD4EF3085);
175 b = hh(b, c, d, a, x[i + 6], 23, 0x04881D05);
176 a = hh(a, b, c, d, x[i + 9], 4, 0xD9D4D039);
177 d = hh(d, a, b, c, x[i + 12], 11, 0xE6DB99E5);
178 c = hh(c, d, a, b, x[i + 15], 16, 0x1FA27CF8);
179 b = hh(b, c, d, a, x[i + 2], 23, 0xC4AC5665);
180
181 a = ii(a, b, c, d, x[i + 0], 6, 0xF4292244);
182 d = ii(d, a, b, c, x[i + 7], 10, 0x432AFF97);
183 c = ii(c, d, a, b, x[i + 14], 15, 0xAB9423A7);
184 b = ii(b, c, d, a, x[i + 5], 21, 0xFC93A039);
185 a = ii(a, b, c, d, x[i + 12], 6, 0x655B59C3);
186 d = ii(d, a, b, c, x[i + 3], 10, 0x8F0CCC92);
187 c = ii(c, d, a, b, x[i + 10], 15, 0xFFEFF47D);
188 b = ii(b, c, d, a, x[i + 1], 21, 0x85845DD1);
189 a = ii(a, b, c, d, x[i + 8], 6, 0x6FA87E4F);
190 d = ii(d, a, b, c, x[i + 15], 10, 0xFE2CE6E0);
191 c = ii(c, d, a, b, x[i + 6], 15, 0xA3014314);
192 b = ii(b, c, d, a, x[i + 13], 21, 0x4E0811A1);
193 a = ii(a, b, c, d, x[i + 4], 6, 0xF7537E82);
194 d = ii(d, a, b, c, x[i + 11], 10, 0xBD3AF235);
195 c = ii(c, d, a, b, x[i + 2], 15, 0x2AD7D2BB);
196 b = ii(b, c, d, a, x[i + 9], 21, 0xEB86D391);
197
198 a = add(a, olda);
199 b = add(b, oldb);
200 c = add(c, oldc);
201 d = add(d, oldd);
202 }
203 return rhex(a) + rhex(b) + rhex(c) + rhex(d);
204 }
205 }
206 }
207 |
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