1 package org.bouncycastle.crypto.digests;
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29 public class MD5Digest
30 extends GeneralDigest
31 {
32 private static final int DIGEST_LENGTH = 16;
33
34 private int H1, H2, H3, H4;
35
36 private int[] X = new int[16];
37 private int xOff;
38
39
40
41
42 public MD5Digest()
43 {
44 reset();
45 }
46
47
48
49
50
51 public MD5Digest(MD5Digest t)
52 {
53 super(t);
54
55 H1 = t.H1;
56 H2 = t.H2;
57 H3 = t.H3;
58 H4 = t.H4;
59
60 System.arraycopy(t.X, 0, X, 0, t.X.length);
61 xOff = t.xOff;
62 }
63
64 public String getAlgorithmName()
65 {
66 return "MD5";
67 }
68
69 public int getDigestSize()
70 {
71 return DIGEST_LENGTH;
72 }
73
74 protected void processWord(
75 byte[] in,
76 int inOff)
77 {
78 X[xOff++] = (in[inOff] & 0xff) | ((in[inOff + 1] & 0xff) << 8)
79 | ((in[inOff + 2] & 0xff) << 16) | ((in[inOff + 3] & 0xff) << 24);
80
81 if (xOff == 16)
82 {
83 processBlock();
84 }
85 }
86
87 protected void processLength(
88 long bitLength)
89 {
90 if (xOff > 14)
91 {
92 processBlock();
93 }
94
95 X[14] = (int)(bitLength & 0xffffffff);
96 X[15] = (int)(bitLength >>> 32);
97 }
98
99 private void unpackWord(
100 int word,
101 byte[] out,
102 int outOff)
103 {
104 out[outOff] = (byte)word;
105 out[outOff + 1] = (byte)(word >>> 8);
106 out[outOff + 2] = (byte)(word >>> 16);
107 out[outOff + 3] = (byte)(word >>> 24);
108 }
109
110 public int doFinal(
111 byte[] out,
112 int outOff)
113 {
114 finish();
115
116 unpackWord(H1, out, outOff);
117 unpackWord(H2, out, outOff + 4);
118 unpackWord(H3, out, outOff + 8);
119 unpackWord(H4, out, outOff + 12);
120
121 reset();
122
123 return DIGEST_LENGTH;
124 }
125
126
127
128
129 public void reset()
130 {
131 super.reset();
132
133 H1 = 0x67452301;
134 H2 = 0xefcdab89;
135 H3 = 0x98badcfe;
136 H4 = 0x10325476;
137
138 xOff = 0;
139
140 for (int i = 0; i != X.length; i++)
141 {
142 X[i] = 0;
143 }
144 }
145
146
147
148
149 private static final int S11 = 7;
150 private static final int S12 = 12;
151 private static final int S13 = 17;
152 private static final int S14 = 22;
153
154
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156
157 private static final int S21 = 5;
158 private static final int S22 = 9;
159 private static final int S23 = 14;
160 private static final int S24 = 20;
161
162
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164
165 private static final int S31 = 4;
166 private static final int S32 = 11;
167 private static final int S33 = 16;
168 private static final int S34 = 23;
169
170
171
172
173 private static final int S41 = 6;
174 private static final int S42 = 10;
175 private static final int S43 = 15;
176 private static final int S44 = 21;
177
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180
181 private int rotateLeft(
182 int x,
183 int n)
184 {
185 return (x << n) | (x >>> (32 - n));
186 }
187
188
189
190
191 private int F(
192 int u,
193 int v,
194 int w)
195 {
196 return (u & v) | (~u & w);
197 }
198
199 private int G(
200 int u,
201 int v,
202 int w)
203 {
204 return (u & w) | (v & ~w);
205 }
206
207 private int H(
208 int u,
209 int v,
210 int w)
211 {
212 return u ^ v ^ w;
213 }
214
215 private int K(
216 int u,
217 int v,
218 int w)
219 {
220 return v ^ (u | ~w);
221 }
222
223 protected void processBlock()
224 {
225 int a = H1;
226 int b = H2;
227 int c = H3;
228 int d = H4;
229
230
231
232
233 a = rotateLeft((a + F(b, c, d) + X[ 0] + 0xd76aa478), S11) + b;
234 d = rotateLeft((d + F(a, b, c) + X[ 1] + 0xe8c7b756), S12) + a;
235 c = rotateLeft((c + F(d, a, b) + X[ 2] + 0x242070db), S13) + d;
236 b = rotateLeft((b + F(c, d, a) + X[ 3] + 0xc1bdceee), S14) + c;
237 a = rotateLeft((a + F(b, c, d) + X[ 4] + 0xf57c0faf), S11) + b;
238 d = rotateLeft((d + F(a, b, c) + X[ 5] + 0x4787c62a), S12) + a;
239 c = rotateLeft((c + F(d, a, b) + X[ 6] + 0xa8304613), S13) + d;
240 b = rotateLeft((b + F(c, d, a) + X[ 7] + 0xfd469501), S14) + c;
241 a = rotateLeft((a + F(b, c, d) + X[ 8] + 0x698098d8), S11) + b;
242 d = rotateLeft((d + F(a, b, c) + X[ 9] + 0x8b44f7af), S12) + a;
243 c = rotateLeft((c + F(d, a, b) + X[10] + 0xffff5bb1), S13) + d;
244 b = rotateLeft((b + F(c, d, a) + X[11] + 0x895cd7be), S14) + c;
245 a = rotateLeft((a + F(b, c, d) + X[12] + 0x6b901122), S11) + b;
246 d = rotateLeft((d + F(a, b, c) + X[13] + 0xfd987193), S12) + a;
247 c = rotateLeft((c + F(d, a, b) + X[14] + 0xa679438e), S13) + d;
248 b = rotateLeft((b + F(c, d, a) + X[15] + 0x49b40821), S14) + c;
249
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252
253 a = rotateLeft((a + G(b, c, d) + X[ 1] + 0xf61e2562), S21) + b;
254 d = rotateLeft((d + G(a, b, c) + X[ 6] + 0xc040b340), S22) + a;
255 c = rotateLeft((c + G(d, a, b) + X[11] + 0x265e5a51), S23) + d;
256 b = rotateLeft((b + G(c, d, a) + X[ 0] + 0xe9b6c7aa), S24) + c;
257 a = rotateLeft((a + G(b, c, d) + X[ 5] + 0xd62f105d), S21) + b;
258 d = rotateLeft((d + G(a, b, c) + X[10] + 0x02441453), S22) + a;
259 c = rotateLeft((c + G(d, a, b) + X[15] + 0xd8a1e681), S23) + d;
260 b = rotateLeft((b + G(c, d, a) + X[ 4] + 0xe7d3fbc8), S24) + c;
261 a = rotateLeft((a + G(b, c, d) + X[ 9] + 0x21e1cde6), S21) + b;
262 d = rotateLeft((d + G(a, b, c) + X[14] + 0xc33707d6), S22) + a;
263 c = rotateLeft((c + G(d, a, b) + X[ 3] + 0xf4d50d87), S23) + d;
264 b = rotateLeft((b + G(c, d, a) + X[ 8] + 0x455a14ed), S24) + c;
265 a = rotateLeft((a + G(b, c, d) + X[13] + 0xa9e3e905), S21) + b;
266 d = rotateLeft((d + G(a, b, c) + X[ 2] + 0xfcefa3f8), S22) + a;
267 c = rotateLeft((c + G(d, a, b) + X[ 7] + 0x676f02d9), S23) + d;
268 b = rotateLeft((b + G(c, d, a) + X[12] + 0x8d2a4c8a), S24) + c;
269
270
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272
273 a = rotateLeft((a + H(b, c, d) + X[ 5] + 0xfffa3942), S31) + b;
274 d = rotateLeft((d + H(a, b, c) + X[ 8] + 0x8771f681), S32) + a;
275 c = rotateLeft((c + H(d, a, b) + X[11] + 0x6d9d6122), S33) + d;
276 b = rotateLeft((b + H(c, d, a) + X[14] + 0xfde5380c), S34) + c;
277 a = rotateLeft((a + H(b, c, d) + X[ 1] + 0xa4beea44), S31) + b;
278 d = rotateLeft((d + H(a, b, c) + X[ 4] + 0x4bdecfa9), S32) + a;
279 c = rotateLeft((c + H(d, a, b) + X[ 7] + 0xf6bb4b60), S33) + d;
280 b = rotateLeft((b + H(c, d, a) + X[10] + 0xbebfbc70), S34) + c;
281 a = rotateLeft((a + H(b, c, d) + X[13] + 0x289b7ec6), S31) + b;
282 d = rotateLeft((d + H(a, b, c) + X[ 0] + 0xeaa127fa), S32) + a;
283 c = rotateLeft((c + H(d, a, b) + X[ 3] + 0xd4ef3085), S33) + d;
284 b = rotateLeft((b + H(c, d, a) + X[ 6] + 0x04881d05), S34) + c;
285 a = rotateLeft((a + H(b, c, d) + X[ 9] + 0xd9d4d039), S31) + b;
286 d = rotateLeft((d + H(a, b, c) + X[12] + 0xe6db99e5), S32) + a;
287 c = rotateLeft((c + H(d, a, b) + X[15] + 0x1fa27cf8), S33) + d;
288 b = rotateLeft((b + H(c, d, a) + X[ 2] + 0xc4ac5665), S34) + c;
289
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292
293 a = rotateLeft((a + K(b, c, d) + X[ 0] + 0xf4292244), S41) + b;
294 d = rotateLeft((d + K(a, b, c) + X[ 7] + 0x432aff97), S42) + a;
295 c = rotateLeft((c + K(d, a, b) + X[14] + 0xab9423a7), S43) + d;
296 b = rotateLeft((b + K(c, d, a) + X[ 5] + 0xfc93a039), S44) + c;
297 a = rotateLeft((a + K(b, c, d) + X[12] + 0x655b59c3), S41) + b;
298 d = rotateLeft((d + K(a, b, c) + X[ 3] + 0x8f0ccc92), S42) + a;
299 c = rotateLeft((c + K(d, a, b) + X[10] + 0xffeff47d), S43) + d;
300 b = rotateLeft((b + K(c, d, a) + X[ 1] + 0x85845dd1), S44) + c;
301 a = rotateLeft((a + K(b, c, d) + X[ 8] + 0x6fa87e4f), S41) + b;
302 d = rotateLeft((d + K(a, b, c) + X[15] + 0xfe2ce6e0), S42) + a;
303 c = rotateLeft((c + K(d, a, b) + X[ 6] + 0xa3014314), S43) + d;
304 b = rotateLeft((b + K(c, d, a) + X[13] + 0x4e0811a1), S44) + c;
305 a = rotateLeft((a + K(b, c, d) + X[ 4] + 0xf7537e82), S41) + b;
306 d = rotateLeft((d + K(a, b, c) + X[11] + 0xbd3af235), S42) + a;
307 c = rotateLeft((c + K(d, a, b) + X[ 2] + 0x2ad7d2bb), S43) + d;
308 b = rotateLeft((b + K(c, d, a) + X[ 9] + 0xeb86d391), S44) + c;
309
310 H1 += a;
311 H2 += b;
312 H3 += c;
313 H4 += d;
314
315
316
317
318 xOff = 0;
319 for (int i = 0; i != X.length; i++)
320 {
321 X[i] = 0;
322 }
323 }
324 }