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