14 #include "stg/ag_md5.h"
16 #define F1(x, y, z) (z ^ (x & (y ^ z)))
17 #define F2(x, y, z) F1(z, x, y)
18 #define F3(x, y, z) (x ^ y ^ z)
19 #define F4(x, y, z) (y ^ (x | ~z))
21 #define MD5STEP(f, w, x, y, z, data, s) \
22 ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
35 if (i >= 12 && i < 38)
36 return ('A' - 12 + i);
38 if (i >= 38 && i < 63)
39 return ('a' - 38 + i);
53 buf[i++] = i64c ((int) (l % 64));
55 } while (l /= 64L, l > 0 && i < 6);
60 char * crypt_make_salt(void)
63 static char result[40];
71 strcpy(result, "$1$"); /* magic for the new MD5 crypt() */
74 * Generate 8 chars of salt, the old crypt() will use only first 2.
77 strcat(result, l64a_(GetTickCount()));
79 strcat(result, l64a_(tsec + getpid() + clock()));
81 gettimeofday(&tv, (struct timezone *) 0);
82 strcat(result, l64a_(tv.tv_usec));
83 strcat(result, l64a_(tv.tv_sec + getpid() + clock()));
86 if (strlen(result) > 3 + 8) /* magic+salt */
92 void byteReverse(unsigned char *buf, unsigned longs)
96 t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
97 ((unsigned) buf[1] << 8 | buf[0]);
98 *(uint32_t *) buf = t;
104 * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
105 * initialization constants.
107 void MD5Init(struct MD5Context *ctx)
109 ctx->buf[0] = 0x67452301;
110 ctx->buf[1] = 0xefcdab89;
111 ctx->buf[2] = 0x98badcfe;
112 ctx->buf[3] = 0x10325476;
119 * Update context to reflect the concatenation of another buffer full
122 void MD5Update(struct MD5Context *ctx, char const *buf, unsigned len)
126 /* Update bitcount */
129 if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
130 ctx->bits[1]++; /* Carry from low to high */
131 ctx->bits[1] += len >> 29;
133 t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */
135 /* Handle any leading odd-sized chunks */
138 unsigned char *p = (unsigned char *) ctx->in + t;
146 byteReverse(ctx->in, 16);
147 MD5Transform(ctx->buf, (uint32_t *) ctx->in);
151 /* Process data in 64-byte chunks */
154 memcpy(ctx->in, buf, 64);
155 byteReverse(ctx->in, 16);
156 MD5Transform(ctx->buf, (uint32_t *) ctx->in);
161 /* Handle any remaining bytes of data. */
163 memcpy(ctx->in, buf, len);
167 * Final wrapup - pad to 64-byte boundary with the bit pattern
168 * 1 0* (64-bit count of bits processed, MSB-first)
171 MD5Final(unsigned char digest[16], struct MD5Context *ctx)
176 /* Compute number of bytes mod 64 */
177 count = (ctx->bits[0] >> 3) & 0x3F;
179 /* Set the first char of padding to 0x80. This is safe since there is
180 always at least one byte free */
184 /* Bytes of padding needed to make 64 bytes */
185 count = 64 - 1 - count;
187 /* Pad out to 56 mod 64 */
189 /* Two lots of padding: Pad the first block to 64 bytes */
191 byteReverse(ctx->in, 16);
192 MD5Transform(ctx->buf, (uint32_t *) ctx->in);
194 /* Now fill the next block with 56 bytes */
195 memset(ctx->in, 0, 56);
197 /* Pad block to 56 bytes */
198 memset(p, 0, count - 8);
200 byteReverse(ctx->in, 14);
202 /* Append length in bits and transform */
203 ((uint32_t *) ctx->in)[14] = ctx->bits[0];
204 ((uint32_t *) ctx->in)[15] = ctx->bits[1];
206 MD5Transform(ctx->buf, (uint32_t *) ctx->in);
207 byteReverse((unsigned char *) ctx->buf, 4);
208 memcpy(digest, ctx->buf, 16);
209 memset((char *) ctx, 0, sizeof(ctx)); /* In case it's sensitive */
213 * The core of the MD5 algorithm, this alters an existing MD5 hash to
214 * reflect the addition of 16 longwords of new data. MD5Update blocks
215 * the data and converts bytes into longwords for this routine.
218 MD5Transform(uint32_t buf[4], uint32_t const in[16])
220 register uint32_t a, b, c, d;
227 MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
228 MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
229 MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
230 MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
231 MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
232 MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
233 MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
234 MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
235 MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
236 MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
237 MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
238 MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
239 MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
240 MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
241 MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
242 MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
244 MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
245 MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
246 MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
247 MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
248 MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
249 MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
250 MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
251 MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
252 MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
253 MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
254 MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
255 MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
256 MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
257 MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
258 MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
259 MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
261 MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
262 MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
263 MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
264 MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
265 MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
266 MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
267 MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
268 MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
269 MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
270 MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
271 MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
272 MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
273 MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
274 MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
275 MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
276 MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
278 MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
279 MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
280 MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
281 MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
282 MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
283 MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
284 MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
285 MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
286 MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
287 MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
288 MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
289 MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
290 MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
291 MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
292 MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
293 MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
301 static unsigned char itoa64[] = /* 0 ... 63 => ascii - 64 */
302 "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
305 to64(char *s, unsigned long v, int n)
308 *s++ = itoa64[v&0x3f];
316 * Use MD5 for what it is best at...
320 libshadow_md5_crypt(const char *pw, const char *salt)
322 static const char *magic = "$1$"; /*
323 * This string is magic for
324 * this algorithm. Having
325 * it this way, we can get
326 * get better later on
328 static char passwd[120], *p;
329 static const char *sp,*ep;
330 unsigned char final[16];
335 /* Refine the Salt first */
338 /* If it starts with the magic string, then skip that */
339 if(!strncmp(sp,magic,strlen(magic)))
342 /* It stops at the first '$', max 8 chars */
343 for(ep=sp;*ep && *ep != '$' && ep < (sp+8);ep++)
346 /* get the length of the true salt */
351 /* The password first, since that is what is most unknown */
352 MD5Update(&ctx, pw, strlen(pw));
354 /* Then our magic string */
355 MD5Update(&ctx, magic, strlen(magic));
357 /* Then the raw salt */
358 MD5Update(&ctx, sp, sl);
360 /* Then just as many characters of the MD5(pw,salt,pw) */
362 MD5Update(&ctx1,pw,strlen(pw));
363 MD5Update(&ctx1,sp,sl);
364 MD5Update(&ctx1,pw,strlen(pw));
365 MD5Final(final,&ctx1);
366 for(pl = strlen(pw); pl > 0; pl -= 16)
367 MD5Update(&ctx, (char*)final, pl>16 ? 16 : pl);
369 /* Don't leave anything around in vm they could use. */
370 memset(final,0,sizeof final);
372 /* Then something really weird... */
373 for (j=0,i = strlen(pw); i ; i >>= 1)
375 MD5Update(&ctx, (char*)final+j, 1);
377 MD5Update(&ctx, pw+j, 1);
379 /* Now make the output string */
380 strcpy(passwd,magic);
381 strncat(passwd,sp,sl);
384 MD5Final(final,&ctx);
387 * and now, just to make sure things don't run too fast
388 * On a 60 Mhz Pentium this takes 34 msec, so you would
389 * need 30 seconds to build a 1000 entry dictionary...
392 for(i=0;i<1000;i++) {
395 MD5Update(&ctx1,pw,strlen(pw));
397 MD5Update(&ctx1,final,16);
400 MD5Update(&ctx1,sp,sl);
403 MD5Update(&ctx1,pw,strlen(pw));
406 MD5Update(&ctx1,final,16);
408 MD5Update(&ctx1,pw,strlen(pw));
409 MD5Final(final,&ctx1);
412 p = passwd + strlen(passwd);
414 l = (final[ 0]<<16) | (final[ 6]<<8) | final[12]; to64(p,l,4); p += 4;
415 l = (final[ 1]<<16) | (final[ 7]<<8) | final[13]; to64(p,l,4); p += 4;
416 l = (final[ 2]<<16) | (final[ 8]<<8) | final[14]; to64(p,l,4); p += 4;
417 l = (final[ 3]<<16) | (final[ 9]<<8) | final[15]; to64(p,l,4); p += 4;
418 l = (final[ 4]<<16) | (final[10]<<8) | final[ 5]; to64(p,l,4); p += 4;
419 l = final[11] ; to64(p,l,2); p += 2;
422 /* Don't leave anything around in vm they could use. */
423 memset(final,0,sizeof final);
428 char *pw_encrypt(const char *clear, const char *salt) {
431 * If the salt string from the password file or from crypt_make_salt()
432 * begins with the magic string, use the new algorithm.
434 if (strncmp(salt, "$1$", 3) == 0)
435 return(libshadow_md5_crypt(clear, salt));
439 /* AG MD5 functions */
440 char *make_ag_hash(time_t salt, const char *clear) {
445 unsigned long slt = salt;
446 sprintf(salt_str, "$1$%08lx", slt);
447 res=libshadow_md5_crypt(clear, salt_str);
452 int check_ag_hash(time_t salt, const char *clear, const char *hash) {
453 return(strcmp(hash, make_ag_hash(salt, clear)));