1 package org.bouncycastle.crypto.digests;
2
3 import org.bouncycastle.crypto.Digest;
4
5
8 public class MD5Digest
9 extends GeneralDigest
10 {
11 private static final int DIGEST_LENGTH = 16;
12
13 private intintintintH1H2H3, H4;
14
15 private int[] X = new int[16];
16 private int xOff;
17
18
21 public MD5Digest()
22 {
23 reset();
24 }
25
26
30 public MD5Digest(MD5Digest t)
31 {
32 super(t);
33
34 H1 = t.H1;
35 H2 = t.H2;
36 H3 = t.H3;
37 H4 = t.H4;
38
39 System.arraycopy(t.X, 0, X, 0, t.X.length);
40 xOff = t.xOff;
41 }
42
43 public String getAlgorithmName()
44 {
45 return "MD5";
46 }
47
48 public int getDigestSize()
49 {
50 return DIGEST_LENGTH;
51 }
52
53 protected void processWord(
54 byte[] in,
55 int inOff)
56 {
57 X[xOff++] = (in[inOff] & 0xff) | ((in[inOff + 1] & 0xff) << 8)
58 | ((in[inOff + 2] & 0xff) << 16) | ((in[inOff + 3] & 0xff) << 24);
59
60 if (xOff == 16)
61 {
62 processBlock();
63 }
64 }
65
66 protected void processLength(
67 long bitLength)
68 {
69 if (xOff > 14)
70 {
71 processBlock();
72 }
73
74 X[14] = (int)(bitLength & 0xffffffff);
75 X[15] = (int)(bitLength >>> 32);
76 }
77
78 private void unpackWord(
79 int word,
80 byte[] out,
81 int outOff)
82 {
83 out[outOff] = (byte)word;
84 out[outOff + 1] = (byte)(word >>> 8);
85 out[outOff + 2] = (byte)(word >>> 16);
86 out[outOff + 3] = (byte)(word >>> 24);
87 }
88
89 public int doFinal(
90 byte[] out,
91 int outOff)
92 {
93 finish();
94
95 unpackWord(H1, out, outOff);
96 unpackWord(H2, out, outOff + 4);
97 unpackWord(H3, out, outOff + 8);
98 unpackWord(H4, out, outOff + 12);
99
100 reset();
101
102 return DIGEST_LENGTH;
103 }
104
105
108 public void reset()
109 {
110 super.reset();
111
112 H1 = 0x67452301;
113 H2 = 0xefcdab89;
114 H3 = 0x98badcfe;
115 H4 = 0x10325476;
116
117 xOff = 0;
118
119 for (int i = 0; i != X.length; i++)
120 {
121 X[i] = 0;
122 }
123 }
124
125
126
127
128 private static final int S11 = 7;
129 private static final int S12 = 12;
130 private static final int S13 = 17;
131 private static final int S14 = 22;
132
133
134
135
136 private static final int S21 = 5;
137 private static final int S22 = 9;
138 private static final int S23 = 14;
139 private static final int S24 = 20;
140
141
142
143
144 private static final int S31 = 4;
145 private static final int S32 = 11;
146 private static final int S33 = 16;
147 private static final int S34 = 23;
148
149
150
151
152 private static final int S41 = 6;
153 private static final int S42 = 10;
154 private static final int S43 = 15;
155 private static final int S44 = 21;
156
157
160 private int rotateLeft(
161 int x,
162 int n)
163 {
164 return (x << n) | (x >>> (32 - n));
165 }
166
167
170 private int F(
171 int u,
172 int v,
173 int w)
174 {
175 return (u & v) | (~u & w);
176 }
177
178 private int G(
179 int u,
180 int v,
181 int w)
182 {
183 return (u & w) | (v & ~w);
184 }
185
186 private int H(
187 int u,
188 int v,
189 int w)
190 {
191 return u ^ v ^ w;
192 }
193
194 private int K(
195 int u,
196 int v,
197 int w)
198 {
199 return v ^ (u | ~w);
200 }
201
202 protected void processBlock()
203 {
204 int a = H1;
205 int b = H2;
206 int c = H3;
207 int d = H4;
208
209
210
211
212 a = rotateLeft((a + F(b, c, d) + X[ 0] + 0xd76aa478), S11) + b;
213 d = rotateLeft((d + F(a, b, c) + X[ 1] + 0xe8c7b756), S12) + a;
214 c = rotateLeft((c + F(d, a, b) + X[ 2] + 0x242070db), S13) + d;
215 b = rotateLeft((b + F(c, d, a) + X[ 3] + 0xc1bdceee), S14) + c;
216 a = rotateLeft((a + F(b, c, d) + X[ 4] + 0xf57c0faf), S11) + b;
217 d = rotateLeft((d + F(a, b, c) + X[ 5] + 0x4787c62a), S12) + a;
218 c = rotateLeft((c + F(d, a, b) + X[ 6] + 0xa8304613), S13) + d;
219 b = rotateLeft((b + F(c, d, a) + X[ 7] + 0xfd469501), S14) + c;
220 a = rotateLeft((a + F(b, c, d) + X[ 8] + 0x698098d8), S11) + b;
221 d = rotateLeft((d + F(a, b, c) + X[ 9] + 0x8b44f7af), S12) + a;
222 c = rotateLeft((c + F(d, a, b) + X[10] + 0xffff5bb1), S13) + d;
223 b = rotateLeft((b + F(c, d, a) + X[11] + 0x895cd7be), S14) + c;
224 a = rotateLeft((a + F(b, c, d) + X[12] + 0x6b901122), S11) + b;
225 d = rotateLeft((d + F(a, b, c) + X[13] + 0xfd987193), S12) + a;
226 c = rotateLeft((c + F(d, a, b) + X[14] + 0xa679438e), S13) + d;
227 b = rotateLeft((b + F(c, d, a) + X[15] + 0x49b40821), S14) + c;
228
229
230
231
232 a = rotateLeft((a + G(b, c, d) + X[ 1] + 0xf61e2562), S21) + b;
233 d = rotateLeft((d + G(a, b, c) + X[ 6] + 0xc040b340), S22) + a;
234 c = rotateLeft((c + G(d, a, b) + X[11] + 0x265e5a51), S23) + d;
235 b = rotateLeft((b + G(c, d, a) + X[ 0] + 0xe9b6c7aa), S24) + c;
236 a = rotateLeft((a + G(b, c, d) + X[ 5] + 0xd62f105d), S21) + b;
237 d = rotateLeft((d + G(a, b, c) + X[10] + 0x02441453), S22) + a;
238 c = rotateLeft((c + G(d, a, b) + X[15] + 0xd8a1e681), S23) + d;
239 b = rotateLeft((b + G(c, d, a) + X[ 4] + 0xe7d3fbc8), S24) + c;
240 a = rotateLeft((a + G(b, c, d) + X[ 9] + 0x21e1cde6), S21) + b;
241 d = rotateLeft((d + G(a, b, c) + X[14] + 0xc33707d6), S22) + a;
242 c = rotateLeft((c + G(d, a, b) + X[ 3] + 0xf4d50d87), S23) + d;
243 b = rotateLeft((b + G(c, d, a) + X[ 8] + 0x455a14ed), S24) + c;
244 a = rotateLeft((a + G(b, c, d) + X[13] + 0xa9e3e905), S21) + b;
245 d = rotateLeft((d + G(a, b, c) + X[ 2] + 0xfcefa3f8), S22) + a;
246 c = rotateLeft((c + G(d, a, b) + X[ 7] + 0x676f02d9), S23) + d;
247 b = rotateLeft((b + G(c, d, a) + X[12] + 0x8d2a4c8a), S24) + c;
248
249
250
251
252 a = rotateLeft((a + H(b, c, d) + X[ 5] + 0xfffa3942), S31) + b;
253 d = rotateLeft((d + H(a, b, c) + X[ 8] + 0x8771f681), S32) + a;
254 c = rotateLeft((c + H(d, a, b) + X[11] + 0x6d9d6122), S33) + d;
255 b = rotateLeft((b + H(c, d, a) + X[14] + 0xfde5380c), S34) + c;
256 a = rotateLeft((a + H(b, c, d) + X[ 1] + 0xa4beea44), S31) + b;
257 d = rotateLeft((d + H(a, b, c) + X[ 4] + 0x4bdecfa9), S32) + a;
258 c = rotateLeft((c + H(d, a, b) + X[ 7] + 0xf6bb4b60), S33) + d;
259 b = rotateLeft((b + H(c, d, a) + X[10] + 0xbebfbc70), S34) + c;
260 a = rotateLeft((a + H(b, c, d) + X[13] + 0x289b7ec6), S31) + b;
261 d = rotateLeft((d + H(a, b, c) + X[ 0] + 0xeaa127fa), S32) + a;
262 c = rotateLeft((c + H(d, a, b) + X[ 3] + 0xd4ef3085), S33) + d;
263 b = rotateLeft((b + H(c, d, a) + X[ 6] + 0x04881d05), S34) + c;
264 a = rotateLeft((a + H(b, c, d) + X[ 9] + 0xd9d4d039), S31) + b;
265 d = rotateLeft((d + H(a, b, c) + X[12] + 0xe6db99e5), S32) + a;
266 c = rotateLeft((c + H(d, a, b) + X[15] + 0x1fa27cf8), S33) + d;
267 b = rotateLeft((b + H(c, d, a) + X[ 2] + 0xc4ac5665), S34) + c;
268
269
270
271
272 a = rotateLeft((a + K(b, c, d) + X[ 0] + 0xf4292244), S41) + b;
273 d = rotateLeft((d + K(a, b, c) + X[ 7] + 0x432aff97), S42) + a;
274 c = rotateLeft((c + K(d, a, b) + X[14] + 0xab9423a7), S43) + d;
275 b = rotateLeft((b + K(c, d, a) + X[ 5] + 0xfc93a039), S44) + c;
276 a = rotateLeft((a + K(b, c, d) + X[12] + 0x655b59c3), S41) + b;
277 d = rotateLeft((d + K(a, b, c) + X[ 3] + 0x8f0ccc92), S42) + a;
278 c = rotateLeft((c + K(d, a, b) + X[10] + 0xffeff47d), S43) + d;
279 b = rotateLeft((b + K(c, d, a) + X[ 1] + 0x85845dd1), S44) + c;
280 a = rotateLeft((a + K(b, c, d) + X[ 8] + 0x6fa87e4f), S41) + b;
281 d = rotateLeft((d + K(a, b, c) + X[15] + 0xfe2ce6e0), S42) + a;
282 c = rotateLeft((c + K(d, a, b) + X[ 6] + 0xa3014314), S43) + d;
283 b = rotateLeft((b + K(c, d, a) + X[13] + 0x4e0811a1), S44) + c;
284 a = rotateLeft((a + K(b, c, d) + X[ 4] + 0xf7537e82), S41) + b;
285 d = rotateLeft((d + K(a, b, c) + X[11] + 0xbd3af235), S42) + a;
286 c = rotateLeft((c + K(d, a, b) + X[ 2] + 0x2ad7d2bb), S43) + d;
287 b = rotateLeft((b + K(c, d, a) + X[ 9] + 0xeb86d391), S44) + c;
288
289 H1 += a;
290 H2 += b;
291 H3 += c;
292 H4 += d;
293
294
295
296
297 xOff = 0;
298 for (int i = 0; i != X.length; i++)
299 {
300 X[i] = 0;
301 }
302 }
303 }
304