1 // The original file was copied from sqlite, and was in the public domain.
2 // Modifications Copyright 2006 Google Inc. All Rights Reserved
5 * This code implements the MD5 message-digest algorithm.
6 * The algorithm is due to Ron Rivest. This code was
7 * written by Colin Plumb in 1993, no copyright is claimed.
8 * This code is in the public domain; do with it what you wish.
10 * Equivalent code is available from RSA Data Security, Inc.
11 * This code has been tested against that, and is equivalent,
12 * except that you don't need to include two pages of legalese
15 * To compute the message digest of a chunk of bytes, declare an
16 * MD5Context structure, pass it to MD5Init, call MD5Update as
17 * needed on buffers full of bytes, and then call MD5Final, which
18 * will fill a supplied 16-byte array with the digest.
25 #include "base/basictypes.h"
34 * Note: this code is harmless on little-endian machines.
36 static void byteReverse(unsigned char *buf
, unsigned longs
){
39 t
= (uint32
)((unsigned)buf
[3]<<8 | buf
[2]) << 16 |
40 ((unsigned)buf
[1]<<8 | buf
[0]);
45 /* The four core functions - F1 is optimized somewhat */
47 /* #define F1(x, y, z) (x & y | ~x & z) */
48 #define F1(x, y, z) (z ^ (x & (y ^ z)))
49 #define F2(x, y, z) F1(z, x, y)
50 #define F3(x, y, z) (x ^ y ^ z)
51 #define F4(x, y, z) (y ^ (x | ~z))
53 /* This is the central step in the MD5 algorithm. */
54 #define MD5STEP(f, w, x, y, z, data, s) \
55 ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
58 * The core of the MD5 algorithm, this alters an existing MD5 hash to
59 * reflect the addition of 16 longwords of new data. MD5Update blocks
60 * the data and converts bytes into longwords for this routine.
62 static void MD5Transform(uint32 buf
[4], const uint32 in
[16]){
63 register uint32 a
, b
, c
, d
;
70 MD5STEP(F1
, a
, b
, c
, d
, in
[ 0]+0xd76aa478, 7);
71 MD5STEP(F1
, d
, a
, b
, c
, in
[ 1]+0xe8c7b756, 12);
72 MD5STEP(F1
, c
, d
, a
, b
, in
[ 2]+0x242070db, 17);
73 MD5STEP(F1
, b
, c
, d
, a
, in
[ 3]+0xc1bdceee, 22);
74 MD5STEP(F1
, a
, b
, c
, d
, in
[ 4]+0xf57c0faf, 7);
75 MD5STEP(F1
, d
, a
, b
, c
, in
[ 5]+0x4787c62a, 12);
76 MD5STEP(F1
, c
, d
, a
, b
, in
[ 6]+0xa8304613, 17);
77 MD5STEP(F1
, b
, c
, d
, a
, in
[ 7]+0xfd469501, 22);
78 MD5STEP(F1
, a
, b
, c
, d
, in
[ 8]+0x698098d8, 7);
79 MD5STEP(F1
, d
, a
, b
, c
, in
[ 9]+0x8b44f7af, 12);
80 MD5STEP(F1
, c
, d
, a
, b
, in
[10]+0xffff5bb1, 17);
81 MD5STEP(F1
, b
, c
, d
, a
, in
[11]+0x895cd7be, 22);
82 MD5STEP(F1
, a
, b
, c
, d
, in
[12]+0x6b901122, 7);
83 MD5STEP(F1
, d
, a
, b
, c
, in
[13]+0xfd987193, 12);
84 MD5STEP(F1
, c
, d
, a
, b
, in
[14]+0xa679438e, 17);
85 MD5STEP(F1
, b
, c
, d
, a
, in
[15]+0x49b40821, 22);
87 MD5STEP(F2
, a
, b
, c
, d
, in
[ 1]+0xf61e2562, 5);
88 MD5STEP(F2
, d
, a
, b
, c
, in
[ 6]+0xc040b340, 9);
89 MD5STEP(F2
, c
, d
, a
, b
, in
[11]+0x265e5a51, 14);
90 MD5STEP(F2
, b
, c
, d
, a
, in
[ 0]+0xe9b6c7aa, 20);
91 MD5STEP(F2
, a
, b
, c
, d
, in
[ 5]+0xd62f105d, 5);
92 MD5STEP(F2
, d
, a
, b
, c
, in
[10]+0x02441453, 9);
93 MD5STEP(F2
, c
, d
, a
, b
, in
[15]+0xd8a1e681, 14);
94 MD5STEP(F2
, b
, c
, d
, a
, in
[ 4]+0xe7d3fbc8, 20);
95 MD5STEP(F2
, a
, b
, c
, d
, in
[ 9]+0x21e1cde6, 5);
96 MD5STEP(F2
, d
, a
, b
, c
, in
[14]+0xc33707d6, 9);
97 MD5STEP(F2
, c
, d
, a
, b
, in
[ 3]+0xf4d50d87, 14);
98 MD5STEP(F2
, b
, c
, d
, a
, in
[ 8]+0x455a14ed, 20);
99 MD5STEP(F2
, a
, b
, c
, d
, in
[13]+0xa9e3e905, 5);
100 MD5STEP(F2
, d
, a
, b
, c
, in
[ 2]+0xfcefa3f8, 9);
101 MD5STEP(F2
, c
, d
, a
, b
, in
[ 7]+0x676f02d9, 14);
102 MD5STEP(F2
, b
, c
, d
, a
, in
[12]+0x8d2a4c8a, 20);
104 MD5STEP(F3
, a
, b
, c
, d
, in
[ 5]+0xfffa3942, 4);
105 MD5STEP(F3
, d
, a
, b
, c
, in
[ 8]+0x8771f681, 11);
106 MD5STEP(F3
, c
, d
, a
, b
, in
[11]+0x6d9d6122, 16);
107 MD5STEP(F3
, b
, c
, d
, a
, in
[14]+0xfde5380c, 23);
108 MD5STEP(F3
, a
, b
, c
, d
, in
[ 1]+0xa4beea44, 4);
109 MD5STEP(F3
, d
, a
, b
, c
, in
[ 4]+0x4bdecfa9, 11);
110 MD5STEP(F3
, c
, d
, a
, b
, in
[ 7]+0xf6bb4b60, 16);
111 MD5STEP(F3
, b
, c
, d
, a
, in
[10]+0xbebfbc70, 23);
112 MD5STEP(F3
, a
, b
, c
, d
, in
[13]+0x289b7ec6, 4);
113 MD5STEP(F3
, d
, a
, b
, c
, in
[ 0]+0xeaa127fa, 11);
114 MD5STEP(F3
, c
, d
, a
, b
, in
[ 3]+0xd4ef3085, 16);
115 MD5STEP(F3
, b
, c
, d
, a
, in
[ 6]+0x04881d05, 23);
116 MD5STEP(F3
, a
, b
, c
, d
, in
[ 9]+0xd9d4d039, 4);
117 MD5STEP(F3
, d
, a
, b
, c
, in
[12]+0xe6db99e5, 11);
118 MD5STEP(F3
, c
, d
, a
, b
, in
[15]+0x1fa27cf8, 16);
119 MD5STEP(F3
, b
, c
, d
, a
, in
[ 2]+0xc4ac5665, 23);
121 MD5STEP(F4
, a
, b
, c
, d
, in
[ 0]+0xf4292244, 6);
122 MD5STEP(F4
, d
, a
, b
, c
, in
[ 7]+0x432aff97, 10);
123 MD5STEP(F4
, c
, d
, a
, b
, in
[14]+0xab9423a7, 15);
124 MD5STEP(F4
, b
, c
, d
, a
, in
[ 5]+0xfc93a039, 21);
125 MD5STEP(F4
, a
, b
, c
, d
, in
[12]+0x655b59c3, 6);
126 MD5STEP(F4
, d
, a
, b
, c
, in
[ 3]+0x8f0ccc92, 10);
127 MD5STEP(F4
, c
, d
, a
, b
, in
[10]+0xffeff47d, 15);
128 MD5STEP(F4
, b
, c
, d
, a
, in
[ 1]+0x85845dd1, 21);
129 MD5STEP(F4
, a
, b
, c
, d
, in
[ 8]+0x6fa87e4f, 6);
130 MD5STEP(F4
, d
, a
, b
, c
, in
[15]+0xfe2ce6e0, 10);
131 MD5STEP(F4
, c
, d
, a
, b
, in
[ 6]+0xa3014314, 15);
132 MD5STEP(F4
, b
, c
, d
, a
, in
[13]+0x4e0811a1, 21);
133 MD5STEP(F4
, a
, b
, c
, d
, in
[ 4]+0xf7537e82, 6);
134 MD5STEP(F4
, d
, a
, b
, c
, in
[11]+0xbd3af235, 10);
135 MD5STEP(F4
, c
, d
, a
, b
, in
[ 2]+0x2ad7d2bb, 15);
136 MD5STEP(F4
, b
, c
, d
, a
, in
[ 9]+0xeb86d391, 21);
145 * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
146 * initialization constants.
148 void MD5Init(MD5Context
*pCtx
){
149 struct Context
*ctx
= (struct Context
*)pCtx
;
150 ctx
->buf
[0] = 0x67452301;
151 ctx
->buf
[1] = 0xefcdab89;
152 ctx
->buf
[2] = 0x98badcfe;
153 ctx
->buf
[3] = 0x10325476;
159 * Update context to reflect the concatenation of another buffer full
162 void MD5Update(MD5Context
*pCtx
, const void *inbuf
, size_t len
){
163 struct Context
*ctx
= (struct Context
*)pCtx
;
164 const unsigned char* buf
= (const unsigned char*)inbuf
;
167 /* Update bitcount */
170 if ((ctx
->bits
[0] = t
+ ((uint32
)len
<< 3)) < t
)
171 ctx
->bits
[1]++; /* Carry from low to high */
172 ctx
->bits
[1] += static_cast<uint32
>(len
>> 29);
174 t
= (t
>> 3) & 0x3f; /* Bytes already in shsInfo->data */
176 /* Handle any leading odd-sized chunks */
179 unsigned char *p
= (unsigned char *)ctx
->in
+ t
;
187 byteReverse(ctx
->in
, 16);
188 MD5Transform(ctx
->buf
, (uint32
*)ctx
->in
);
193 /* Process data in 64-byte chunks */
196 memcpy(ctx
->in
, buf
, 64);
197 byteReverse(ctx
->in
, 16);
198 MD5Transform(ctx
->buf
, (uint32
*)ctx
->in
);
203 /* Handle any remaining bytes of data. */
205 memcpy(ctx
->in
, buf
, len
);
209 * Final wrapup - pad to 64-byte boundary with the bit pattern
210 * 1 0* (64-bit count of bits processed, MSB-first)
212 void MD5Final(MD5Digest
* digest
, MD5Context
*pCtx
){
213 struct Context
*ctx
= (struct Context
*)pCtx
;
217 /* Compute number of bytes mod 64 */
218 count
= (ctx
->bits
[0] >> 3) & 0x3F;
220 /* Set the first char of padding to 0x80. This is safe since there is
221 always at least one byte free */
225 /* Bytes of padding needed to make 64 bytes */
226 count
= 64 - 1 - count
;
228 /* Pad out to 56 mod 64 */
230 /* Two lots of padding: Pad the first block to 64 bytes */
232 byteReverse(ctx
->in
, 16);
233 MD5Transform(ctx
->buf
, (uint32
*)ctx
->in
);
235 /* Now fill the next block with 56 bytes */
236 memset(ctx
->in
, 0, 56);
238 /* Pad block to 56 bytes */
239 memset(p
, 0, count
-8);
241 byteReverse(ctx
->in
, 14);
243 /* Append length in bits and transform */
244 ((uint32
*)ctx
->in
)[ 14 ] = ctx
->bits
[0];
245 ((uint32
*)ctx
->in
)[ 15 ] = ctx
->bits
[1];
247 MD5Transform(ctx
->buf
, (uint32
*)ctx
->in
);
248 byteReverse((unsigned char *)ctx
->buf
, 4);
249 memcpy(digest
->a
, ctx
->buf
, 16);
250 memset(ctx
, 0, sizeof(*ctx
)); /* In case it's sensitive */
253 std::string
MD5DigestToBase16(const MD5Digest
& digest
){
254 static char const zEncode
[] = "0123456789abcdef";
260 for (int i
= 0; i
< 16; i
++) {
262 ret
[j
++] = zEncode
[(a
>>4)&0xf];
263 ret
[j
++] = zEncode
[a
& 0xf];
268 void MD5Sum(const void* data
, size_t length
, MD5Digest
* digest
) {
271 MD5Update(&ctx
, static_cast<const unsigned char*>(data
), length
);
272 MD5Final(digest
, &ctx
);
275 std::string
MD5String(const std::string
& str
) {
277 MD5Sum(str
.data(), str
.length(), &digest
);
278 return MD5DigestToBase16(digest
);