]>
git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - fs/cifs/md5.c
2 * This code implements the MD5 message-digest algorithm.
3 * The algorithm is due to Ron Rivest. This code was
4 * written by Colin Plumb in 1993, no copyright is claimed.
5 * This code is in the public domain; do with it what you wish.
7 * Equivalent code is available from RSA Data Security, Inc.
8 * This code has been tested against that, and is equivalent,
9 * except that you don't need to include two pages of legalese
12 * To compute the message digest of a chunk of bytes, declare an
13 * MD5Context structure, pass it to MD5Init, call MD5Update as
14 * needed on buffers full of bytes, and then call MD5Final, which
15 * will fill a supplied 16-byte array with the digest.
18 /* This code slightly modified to fit into Samba by
19 abartlet@samba.org Jun 2001
20 and to fit the cifs vfs by
21 Steve French sfrench@us.ibm.com */
23 #include <linux/string.h>
26 static void MD5Transform(__u32 buf
[4], __u32
const in
[16]);
29 * Note: this code is harmless on little-endian machines.
32 byteReverse(unsigned char *buf
, unsigned longs
)
36 t
= (__u32
) ((unsigned) buf
[3] << 8 | buf
[2]) << 16 |
37 ((unsigned) buf
[1] << 8 | buf
[0]);
44 * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
45 * initialization constants.
48 MD5Init(struct MD5Context
*ctx
)
50 ctx
->buf
[0] = 0x67452301;
51 ctx
->buf
[1] = 0xefcdab89;
52 ctx
->buf
[2] = 0x98badcfe;
53 ctx
->buf
[3] = 0x10325476;
60 * Update context to reflect the concatenation of another buffer full
64 MD5Update(struct MD5Context
*ctx
, unsigned char const *buf
, unsigned len
)
71 if ((ctx
->bits
[0] = t
+ ((__u32
) len
<< 3)) < t
)
72 ctx
->bits
[1]++; /* Carry from low to high */
73 ctx
->bits
[1] += len
>> 29;
75 t
= (t
>> 3) & 0x3f; /* Bytes already in shsInfo->data */
77 /* Handle any leading odd-sized chunks */
80 unsigned char *p
= (unsigned char *) ctx
->in
+ t
;
88 byteReverse(ctx
->in
, 16);
89 MD5Transform(ctx
->buf
, (__u32
*) ctx
->in
);
93 /* Process data in 64-byte chunks */
96 memmove(ctx
->in
, buf
, 64);
97 byteReverse(ctx
->in
, 16);
98 MD5Transform(ctx
->buf
, (__u32
*) ctx
->in
);
103 /* Handle any remaining bytes of data. */
105 memmove(ctx
->in
, buf
, len
);
109 * Final wrapup - pad to 64-byte boundary with the bit pattern
110 * 1 0* (64-bit count of bits processed, MSB-first)
113 MD5Final(unsigned char digest
[16], struct MD5Context
*ctx
)
118 /* Compute number of bytes mod 64 */
119 count
= (ctx
->bits
[0] >> 3) & 0x3F;
121 /* Set the first char of padding to 0x80. This is safe since there is
122 always at least one byte free */
126 /* Bytes of padding needed to make 64 bytes */
127 count
= 64 - 1 - count
;
129 /* Pad out to 56 mod 64 */
131 /* Two lots of padding: Pad the first block to 64 bytes */
133 byteReverse(ctx
->in
, 16);
134 MD5Transform(ctx
->buf
, (__u32
*) ctx
->in
);
136 /* Now fill the next block with 56 bytes */
137 memset(ctx
->in
, 0, 56);
139 /* Pad block to 56 bytes */
140 memset(p
, 0, count
- 8);
142 byteReverse(ctx
->in
, 14);
144 /* Append length in bits and transform */
145 ((__u32
*) ctx
->in
)[14] = ctx
->bits
[0];
146 ((__u32
*) ctx
->in
)[15] = ctx
->bits
[1];
148 MD5Transform(ctx
->buf
, (__u32
*) ctx
->in
);
149 byteReverse((unsigned char *) ctx
->buf
, 4);
150 memmove(digest
, ctx
->buf
, 16);
151 memset(ctx
, 0, sizeof(*ctx
)); /* In case it's sensitive */
154 /* The four core functions - F1 is optimized somewhat */
156 /* #define F1(x, y, z) (x & y | ~x & z) */
157 #define F1(x, y, z) (z ^ (x & (y ^ z)))
158 #define F2(x, y, z) F1(z, x, y)
159 #define F3(x, y, z) (x ^ y ^ z)
160 #define F4(x, y, z) (y ^ (x | ~z))
162 /* This is the central step in the MD5 algorithm. */
163 #define MD5STEP(f, w, x, y, z, data, s) \
164 (w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x)
167 * The core of the MD5 algorithm, this alters an existing MD5 hash to
168 * reflect the addition of 16 longwords of new data. MD5Update blocks
169 * the data and converts bytes into longwords for this routine.
172 MD5Transform(__u32 buf
[4], __u32
const in
[16])
174 register __u32 a
, b
, c
, d
;
181 MD5STEP(F1
, a
, b
, c
, d
, in
[0] + 0xd76aa478, 7);
182 MD5STEP(F1
, d
, a
, b
, c
, in
[1] + 0xe8c7b756, 12);
183 MD5STEP(F1
, c
, d
, a
, b
, in
[2] + 0x242070db, 17);
184 MD5STEP(F1
, b
, c
, d
, a
, in
[3] + 0xc1bdceee, 22);
185 MD5STEP(F1
, a
, b
, c
, d
, in
[4] + 0xf57c0faf, 7);
186 MD5STEP(F1
, d
, a
, b
, c
, in
[5] + 0x4787c62a, 12);
187 MD5STEP(F1
, c
, d
, a
, b
, in
[6] + 0xa8304613, 17);
188 MD5STEP(F1
, b
, c
, d
, a
, in
[7] + 0xfd469501, 22);
189 MD5STEP(F1
, a
, b
, c
, d
, in
[8] + 0x698098d8, 7);
190 MD5STEP(F1
, d
, a
, b
, c
, in
[9] + 0x8b44f7af, 12);
191 MD5STEP(F1
, c
, d
, a
, b
, in
[10] + 0xffff5bb1, 17);
192 MD5STEP(F1
, b
, c
, d
, a
, in
[11] + 0x895cd7be, 22);
193 MD5STEP(F1
, a
, b
, c
, d
, in
[12] + 0x6b901122, 7);
194 MD5STEP(F1
, d
, a
, b
, c
, in
[13] + 0xfd987193, 12);
195 MD5STEP(F1
, c
, d
, a
, b
, in
[14] + 0xa679438e, 17);
196 MD5STEP(F1
, b
, c
, d
, a
, in
[15] + 0x49b40821, 22);
198 MD5STEP(F2
, a
, b
, c
, d
, in
[1] + 0xf61e2562, 5);
199 MD5STEP(F2
, d
, a
, b
, c
, in
[6] + 0xc040b340, 9);
200 MD5STEP(F2
, c
, d
, a
, b
, in
[11] + 0x265e5a51, 14);
201 MD5STEP(F2
, b
, c
, d
, a
, in
[0] + 0xe9b6c7aa, 20);
202 MD5STEP(F2
, a
, b
, c
, d
, in
[5] + 0xd62f105d, 5);
203 MD5STEP(F2
, d
, a
, b
, c
, in
[10] + 0x02441453, 9);
204 MD5STEP(F2
, c
, d
, a
, b
, in
[15] + 0xd8a1e681, 14);
205 MD5STEP(F2
, b
, c
, d
, a
, in
[4] + 0xe7d3fbc8, 20);
206 MD5STEP(F2
, a
, b
, c
, d
, in
[9] + 0x21e1cde6, 5);
207 MD5STEP(F2
, d
, a
, b
, c
, in
[14] + 0xc33707d6, 9);
208 MD5STEP(F2
, c
, d
, a
, b
, in
[3] + 0xf4d50d87, 14);
209 MD5STEP(F2
, b
, c
, d
, a
, in
[8] + 0x455a14ed, 20);
210 MD5STEP(F2
, a
, b
, c
, d
, in
[13] + 0xa9e3e905, 5);
211 MD5STEP(F2
, d
, a
, b
, c
, in
[2] + 0xfcefa3f8, 9);
212 MD5STEP(F2
, c
, d
, a
, b
, in
[7] + 0x676f02d9, 14);
213 MD5STEP(F2
, b
, c
, d
, a
, in
[12] + 0x8d2a4c8a, 20);
215 MD5STEP(F3
, a
, b
, c
, d
, in
[5] + 0xfffa3942, 4);
216 MD5STEP(F3
, d
, a
, b
, c
, in
[8] + 0x8771f681, 11);
217 MD5STEP(F3
, c
, d
, a
, b
, in
[11] + 0x6d9d6122, 16);
218 MD5STEP(F3
, b
, c
, d
, a
, in
[14] + 0xfde5380c, 23);
219 MD5STEP(F3
, a
, b
, c
, d
, in
[1] + 0xa4beea44, 4);
220 MD5STEP(F3
, d
, a
, b
, c
, in
[4] + 0x4bdecfa9, 11);
221 MD5STEP(F3
, c
, d
, a
, b
, in
[7] + 0xf6bb4b60, 16);
222 MD5STEP(F3
, b
, c
, d
, a
, in
[10] + 0xbebfbc70, 23);
223 MD5STEP(F3
, a
, b
, c
, d
, in
[13] + 0x289b7ec6, 4);
224 MD5STEP(F3
, d
, a
, b
, c
, in
[0] + 0xeaa127fa, 11);
225 MD5STEP(F3
, c
, d
, a
, b
, in
[3] + 0xd4ef3085, 16);
226 MD5STEP(F3
, b
, c
, d
, a
, in
[6] + 0x04881d05, 23);
227 MD5STEP(F3
, a
, b
, c
, d
, in
[9] + 0xd9d4d039, 4);
228 MD5STEP(F3
, d
, a
, b
, c
, in
[12] + 0xe6db99e5, 11);
229 MD5STEP(F3
, c
, d
, a
, b
, in
[15] + 0x1fa27cf8, 16);
230 MD5STEP(F3
, b
, c
, d
, a
, in
[2] + 0xc4ac5665, 23);
232 MD5STEP(F4
, a
, b
, c
, d
, in
[0] + 0xf4292244, 6);
233 MD5STEP(F4
, d
, a
, b
, c
, in
[7] + 0x432aff97, 10);
234 MD5STEP(F4
, c
, d
, a
, b
, in
[14] + 0xab9423a7, 15);
235 MD5STEP(F4
, b
, c
, d
, a
, in
[5] + 0xfc93a039, 21);
236 MD5STEP(F4
, a
, b
, c
, d
, in
[12] + 0x655b59c3, 6);
237 MD5STEP(F4
, d
, a
, b
, c
, in
[3] + 0x8f0ccc92, 10);
238 MD5STEP(F4
, c
, d
, a
, b
, in
[10] + 0xffeff47d, 15);
239 MD5STEP(F4
, b
, c
, d
, a
, in
[1] + 0x85845dd1, 21);
240 MD5STEP(F4
, a
, b
, c
, d
, in
[8] + 0x6fa87e4f, 6);
241 MD5STEP(F4
, d
, a
, b
, c
, in
[15] + 0xfe2ce6e0, 10);
242 MD5STEP(F4
, c
, d
, a
, b
, in
[6] + 0xa3014314, 15);
243 MD5STEP(F4
, b
, c
, d
, a
, in
[13] + 0x4e0811a1, 21);
244 MD5STEP(F4
, a
, b
, c
, d
, in
[4] + 0xf7537e82, 6);
245 MD5STEP(F4
, d
, a
, b
, c
, in
[11] + 0xbd3af235, 10);
246 MD5STEP(F4
, c
, d
, a
, b
, in
[2] + 0x2ad7d2bb, 15);
247 MD5STEP(F4
, b
, c
, d
, a
, in
[9] + 0xeb86d391, 21);
255 #if 0 /* currently unused */
256 /***********************************************************************
257 the rfc 2104 version of hmac_md5 initialisation.
258 ***********************************************************************/
260 hmac_md5_init_rfc2104(unsigned char *key
, int key_len
,
261 struct HMACMD5Context
*ctx
)
265 /* if key is longer than 64 bytes reset it to key=MD5(key) */
267 unsigned char tk
[16];
268 struct MD5Context tctx
;
271 MD5Update(&tctx
, key
, key_len
);
278 /* start out by storing key in pads */
279 memset(ctx
->k_ipad
, 0, sizeof(ctx
->k_ipad
));
280 memset(ctx
->k_opad
, 0, sizeof(ctx
->k_opad
));
281 memcpy(ctx
->k_ipad
, key
, key_len
);
282 memcpy(ctx
->k_opad
, key
, key_len
);
284 /* XOR key with ipad and opad values */
285 for (i
= 0; i
< 64; i
++) {
286 ctx
->k_ipad
[i
] ^= 0x36;
287 ctx
->k_opad
[i
] ^= 0x5c;
291 MD5Update(&ctx
->ctx
, ctx
->k_ipad
, 64);
295 /***********************************************************************
296 the microsoft version of hmac_md5 initialisation.
297 ***********************************************************************/
299 hmac_md5_init_limK_to_64(const unsigned char *key
, int key_len
,
300 struct HMACMD5Context
*ctx
)
304 /* if key is longer than 64 bytes truncate it */
308 /* start out by storing key in pads */
309 memset(ctx
->k_ipad
, 0, sizeof(ctx
->k_ipad
));
310 memset(ctx
->k_opad
, 0, sizeof(ctx
->k_opad
));
311 memcpy(ctx
->k_ipad
, key
, key_len
);
312 memcpy(ctx
->k_opad
, key
, key_len
);
314 /* XOR key with ipad and opad values */
315 for (i
= 0; i
< 64; i
++) {
316 ctx
->k_ipad
[i
] ^= 0x36;
317 ctx
->k_opad
[i
] ^= 0x5c;
321 MD5Update(&ctx
->ctx
, ctx
->k_ipad
, 64);
324 /***********************************************************************
325 update hmac_md5 "inner" buffer
326 ***********************************************************************/
328 hmac_md5_update(const unsigned char *text
, int text_len
,
329 struct HMACMD5Context
*ctx
)
331 MD5Update(&ctx
->ctx
, text
, text_len
); /* then text of datagram */
334 /***********************************************************************
335 finish off hmac_md5 "inner" buffer and generate outer one.
336 ***********************************************************************/
338 hmac_md5_final(unsigned char *digest
, struct HMACMD5Context
*ctx
)
340 struct MD5Context ctx_o
;
342 MD5Final(digest
, &ctx
->ctx
);
345 MD5Update(&ctx_o
, ctx
->k_opad
, 64);
346 MD5Update(&ctx_o
, digest
, 16);
347 MD5Final(digest
, &ctx_o
);
350 /***********************************************************
351 single function to calculate an HMAC MD5 digest from data.
352 use the microsoft hmacmd5 init method because the key is 16 bytes.
353 ************************************************************/
354 #if 0 /* currently unused */
356 hmac_md5(unsigned char key
[16], unsigned char *data
, int data_len
,
357 unsigned char *digest
)
359 struct HMACMD5Context ctx
;
360 hmac_md5_init_limK_to_64(key
, 16, &ctx
);
362 hmac_md5_update(data
, data_len
, &ctx
);
364 hmac_md5_final(digest
, &ctx
);