2 * MD5 Message Digest Algorithm (RFC1321).
4 * Derived from cryptoapi implementation, originally based on the
5 * public domain implementation written by Colin Plumb in 1993.
7 * Copyright (c) Cryptoapi developers.
8 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the Free
12 * Software Foundation; either version 2 of the License, or (at your option)
23 #if !defined __BYTE_ORDER || !(__BYTE_ORDER == __LITTLE_ENDIAN) && !(__BYTE_ORDER == __BIG_ENDIAN)
24 #error missing __BYTE_ORDER
27 #define F1(x, y, z) (z ^ (x & (y ^ z)))
28 #define F2(x, y, z) F1(z, x, y)
29 #define F3(x, y, z) (x ^ y ^ z)
30 #define F4(x, y, z) (y ^ (x | ~z))
32 #define MD5STEP(f, w, x, y, z, in, s) \
33 (w += f(x, y, z) + in, w = (w<<s | w>>(32-s)) + x)
35 static void md5_transform(uint32_t *hash, uint32_t const *in)
44 MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
45 MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
46 MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
47 MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
48 MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
49 MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
50 MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
51 MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
52 MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
53 MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
54 MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
55 MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
56 MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
57 MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
58 MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
59 MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
61 MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
62 MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
63 MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
64 MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
65 MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
66 MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
67 MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
68 MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
69 MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
70 MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
71 MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
72 MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
73 MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
74 MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
75 MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
76 MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
78 MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
79 MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
80 MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
81 MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
82 MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
83 MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
84 MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
85 MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
86 MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
87 MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
88 MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
89 MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
90 MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
91 MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
92 MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
93 MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
95 MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
96 MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
97 MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
98 MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
99 MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
100 MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
101 MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
102 MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
103 MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
104 MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
105 MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
106 MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
107 MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
108 MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
109 MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
110 MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
118 static inline void swab32_array(uint32_t *buf, unsigned int words)
122 for (i = 0; i < words; i++)
123 buf[i] = bswap_32(buf[i]);
126 static inline void le32_to_cpu_array(uint32_t *buf, unsigned int words)
128 #if (__BYTE_ORDER == __BIG_ENDIAN)
129 swab32_array(buf, words);
132 static inline void cpu_to_le32_array(uint32_t *buf, unsigned int words)
134 #if (__BYTE_ORDER == __BIG_ENDIAN)
135 swab32_array(buf, words);
139 static inline void md5_transform_helper(struct md5_ctx *ctx)
141 le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(uint32_t));
142 md5_transform(ctx->hash, ctx->block);
145 void md5_init(struct md5_ctx *mctx)
147 mctx->hash[0] = 0x67452301;
148 mctx->hash[1] = 0xefcdab89;
149 mctx->hash[2] = 0x98badcfe;
150 mctx->hash[3] = 0x10325476;
151 mctx->byte_count = 0;
154 void md5_update(struct md5_ctx *mctx, const uint8_t *data, unsigned int len)
156 const uint32_t avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
158 mctx->byte_count += len;
161 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
166 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), data, avail);
168 md5_transform_helper(mctx);
172 while (len >= sizeof(mctx->block)) {
173 memcpy(mctx->block, data, sizeof(mctx->block));
174 md5_transform_helper(mctx);
175 data += sizeof(mctx->block);
176 len -= sizeof(mctx->block);
179 memcpy(mctx->block, data, len);
182 void md5_final(struct md5_ctx *mctx, uint8_t *out)
184 const unsigned int offset = mctx->byte_count & 0x3f;
185 char *p = (char *)mctx->block + offset;
186 int padding = 56 - (offset + 1);
190 memset(p, 0x00, padding + sizeof (uint64_t));
191 md5_transform_helper(mctx);
192 p = (char *)mctx->block;
196 memset(p, 0, padding);
197 mctx->block[14] = mctx->byte_count << 3;
198 mctx->block[15] = mctx->byte_count >> 29;
199 le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
200 sizeof(uint64_t)) / sizeof(uint32_t));
201 md5_transform(mctx->hash, mctx->block);
202 cpu_to_le32_array(mctx->hash, sizeof(mctx->hash) / sizeof(uint32_t));
203 memcpy(out, mctx->hash, sizeof(mctx->hash));
204 memset(mctx, 0, sizeof(*mctx));