1 2 #pragma ident "%Z%%M% %I% %E% SMI" 3 4 /* 5 ** SQLite uses this code for testing only. It is not a part of 6 ** the SQLite library. This file implements two new TCL commands 7 ** "md5" and "md5file" that compute md5 checksums on arbitrary text 8 ** and on complete files. These commands are used by the "testfixture" 9 ** program to help verify the correct operation of the SQLite library. 10 ** 11 ** The original use of these TCL commands was to test the ROLLBACK 12 ** feature of SQLite. First compute the MD5-checksum of the database. 13 ** Then make some changes but rollback the changes rather than commit 14 ** them. Compute a second MD5-checksum of the file and verify that the 15 ** two checksums are the same. Such is the original use of this code. 16 ** New uses may have been added since this comment was written. 17 */ 18 /* 19 * This code implements the MD5 message-digest algorithm. 20 * The algorithm is due to Ron Rivest. This code was 21 * written by Colin Plumb in 1993, no copyright is claimed. 22 * This code is in the public domain; do with it what you wish. 23 * 24 * Equivalent code is available from RSA Data Security, Inc. 25 * This code has been tested against that, and is equivalent, 26 * except that you don't need to include two pages of legalese 27 * with every copy. 28 * 29 * To compute the message digest of a chunk of bytes, declare an 30 * MD5Context structure, pass it to MD5Init, call MD5Update as 31 * needed on buffers full of bytes, and then call MD5Final, which 32 * will fill a supplied 16-byte array with the digest. 33 */ 34 #include <tcl.h> 35 #include <string.h> 36 #include "sqlite.h" 37 38 /* 39 * If compiled on a machine that doesn't have a 32-bit integer, 40 * you just set "uint32" to the appropriate datatype for an 41 * unsigned 32-bit integer. For example: 42 * 43 * cc -Duint32='unsigned long' md5.c 44 * 45 */ 46 #ifndef uint32 47 # define uint32 unsigned int 48 #endif 49 50 struct Context { 51 uint32 buf[4]; 52 uint32 bits[2]; 53 unsigned char in[64]; 54 }; 55 typedef char MD5Context[88]; 56 57 /* 58 * Note: this code is harmless on little-endian machines. 59 */ 60 static void byteReverse (unsigned char *buf, unsigned longs){ 61 uint32 t; 62 do { 63 t = (uint32)((unsigned)buf[3]<<8 | buf[2]) << 16 | 64 ((unsigned)buf[1]<<8 | buf[0]); 65 *(uint32 *)buf = t; 66 buf += 4; 67 } while (--longs); 68 } 69 /* The four core functions - F1 is optimized somewhat */ 70 71 /* #define F1(x, y, z) (x & y | ~x & z) */ 72 #define F1(x, y, z) (z ^ (x & (y ^ z))) 73 #define F2(x, y, z) F1(z, x, y) 74 #define F3(x, y, z) (x ^ y ^ z) 75 #define F4(x, y, z) (y ^ (x | ~z)) 76 77 /* This is the central step in the MD5 algorithm. */ 78 #define MD5STEP(f, w, x, y, z, data, s) \ 79 ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x ) 80 81 /* 82 * The core of the MD5 algorithm, this alters an existing MD5 hash to 83 * reflect the addition of 16 longwords of new data. MD5Update blocks 84 * the data and converts bytes into longwords for this routine. 85 */ 86 static void MD5Transform(uint32 buf[4], const uint32 in[16]){ 87 register uint32 a, b, c, d; 88 89 a = buf[0]; 90 b = buf[1]; 91 c = buf[2]; 92 d = buf[3]; 93 94 MD5STEP(F1, a, b, c, d, in[ 0]+0xd76aa478, 7); 95 MD5STEP(F1, d, a, b, c, in[ 1]+0xe8c7b756, 12); 96 MD5STEP(F1, c, d, a, b, in[ 2]+0x242070db, 17); 97 MD5STEP(F1, b, c, d, a, in[ 3]+0xc1bdceee, 22); 98 MD5STEP(F1, a, b, c, d, in[ 4]+0xf57c0faf, 7); 99 MD5STEP(F1, d, a, b, c, in[ 5]+0x4787c62a, 12); 100 MD5STEP(F1, c, d, a, b, in[ 6]+0xa8304613, 17); 101 MD5STEP(F1, b, c, d, a, in[ 7]+0xfd469501, 22); 102 MD5STEP(F1, a, b, c, d, in[ 8]+0x698098d8, 7); 103 MD5STEP(F1, d, a, b, c, in[ 9]+0x8b44f7af, 12); 104 MD5STEP(F1, c, d, a, b, in[10]+0xffff5bb1, 17); 105 MD5STEP(F1, b, c, d, a, in[11]+0x895cd7be, 22); 106 MD5STEP(F1, a, b, c, d, in[12]+0x6b901122, 7); 107 MD5STEP(F1, d, a, b, c, in[13]+0xfd987193, 12); 108 MD5STEP(F1, c, d, a, b, in[14]+0xa679438e, 17); 109 MD5STEP(F1, b, c, d, a, in[15]+0x49b40821, 22); 110 111 MD5STEP(F2, a, b, c, d, in[ 1]+0xf61e2562, 5); 112 MD5STEP(F2, d, a, b, c, in[ 6]+0xc040b340, 9); 113 MD5STEP(F2, c, d, a, b, in[11]+0x265e5a51, 14); 114 MD5STEP(F2, b, c, d, a, in[ 0]+0xe9b6c7aa, 20); 115 MD5STEP(F2, a, b, c, d, in[ 5]+0xd62f105d, 5); 116 MD5STEP(F2, d, a, b, c, in[10]+0x02441453, 9); 117 MD5STEP(F2, c, d, a, b, in[15]+0xd8a1e681, 14); 118 MD5STEP(F2, b, c, d, a, in[ 4]+0xe7d3fbc8, 20); 119 MD5STEP(F2, a, b, c, d, in[ 9]+0x21e1cde6, 5); 120 MD5STEP(F2, d, a, b, c, in[14]+0xc33707d6, 9); 121 MD5STEP(F2, c, d, a, b, in[ 3]+0xf4d50d87, 14); 122 MD5STEP(F2, b, c, d, a, in[ 8]+0x455a14ed, 20); 123 MD5STEP(F2, a, b, c, d, in[13]+0xa9e3e905, 5); 124 MD5STEP(F2, d, a, b, c, in[ 2]+0xfcefa3f8, 9); 125 MD5STEP(F2, c, d, a, b, in[ 7]+0x676f02d9, 14); 126 MD5STEP(F2, b, c, d, a, in[12]+0x8d2a4c8a, 20); 127 128 MD5STEP(F3, a, b, c, d, in[ 5]+0xfffa3942, 4); 129 MD5STEP(F3, d, a, b, c, in[ 8]+0x8771f681, 11); 130 MD5STEP(F3, c, d, a, b, in[11]+0x6d9d6122, 16); 131 MD5STEP(F3, b, c, d, a, in[14]+0xfde5380c, 23); 132 MD5STEP(F3, a, b, c, d, in[ 1]+0xa4beea44, 4); 133 MD5STEP(F3, d, a, b, c, in[ 4]+0x4bdecfa9, 11); 134 MD5STEP(F3, c, d, a, b, in[ 7]+0xf6bb4b60, 16); 135 MD5STEP(F3, b, c, d, a, in[10]+0xbebfbc70, 23); 136 MD5STEP(F3, a, b, c, d, in[13]+0x289b7ec6, 4); 137 MD5STEP(F3, d, a, b, c, in[ 0]+0xeaa127fa, 11); 138 MD5STEP(F3, c, d, a, b, in[ 3]+0xd4ef3085, 16); 139 MD5STEP(F3, b, c, d, a, in[ 6]+0x04881d05, 23); 140 MD5STEP(F3, a, b, c, d, in[ 9]+0xd9d4d039, 4); 141 MD5STEP(F3, d, a, b, c, in[12]+0xe6db99e5, 11); 142 MD5STEP(F3, c, d, a, b, in[15]+0x1fa27cf8, 16); 143 MD5STEP(F3, b, c, d, a, in[ 2]+0xc4ac5665, 23); 144 145 MD5STEP(F4, a, b, c, d, in[ 0]+0xf4292244, 6); 146 MD5STEP(F4, d, a, b, c, in[ 7]+0x432aff97, 10); 147 MD5STEP(F4, c, d, a, b, in[14]+0xab9423a7, 15); 148 MD5STEP(F4, b, c, d, a, in[ 5]+0xfc93a039, 21); 149 MD5STEP(F4, a, b, c, d, in[12]+0x655b59c3, 6); 150 MD5STEP(F4, d, a, b, c, in[ 3]+0x8f0ccc92, 10); 151 MD5STEP(F4, c, d, a, b, in[10]+0xffeff47d, 15); 152 MD5STEP(F4, b, c, d, a, in[ 1]+0x85845dd1, 21); 153 MD5STEP(F4, a, b, c, d, in[ 8]+0x6fa87e4f, 6); 154 MD5STEP(F4, d, a, b, c, in[15]+0xfe2ce6e0, 10); 155 MD5STEP(F4, c, d, a, b, in[ 6]+0xa3014314, 15); 156 MD5STEP(F4, b, c, d, a, in[13]+0x4e0811a1, 21); 157 MD5STEP(F4, a, b, c, d, in[ 4]+0xf7537e82, 6); 158 MD5STEP(F4, d, a, b, c, in[11]+0xbd3af235, 10); 159 MD5STEP(F4, c, d, a, b, in[ 2]+0x2ad7d2bb, 15); 160 MD5STEP(F4, b, c, d, a, in[ 9]+0xeb86d391, 21); 161 162 buf[0] += a; 163 buf[1] += b; 164 buf[2] += c; 165 buf[3] += d; 166 } 167 168 /* 169 * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious 170 * initialization constants. 171 */ 172 static void MD5Init(MD5Context *pCtx){ 173 struct Context *ctx = (struct Context *)pCtx; 174 ctx->buf[0] = 0x67452301; 175 ctx->buf[1] = 0xefcdab89; 176 ctx->buf[2] = 0x98badcfe; 177 ctx->buf[3] = 0x10325476; 178 ctx->bits[0] = 0; 179 ctx->bits[1] = 0; 180 } 181 182 /* 183 * Update context to reflect the concatenation of another buffer full 184 * of bytes. 185 */ 186 static 187 void MD5Update(MD5Context *pCtx, const unsigned char *buf, unsigned int len){ 188 struct Context *ctx = (struct Context *)pCtx; 189 uint32 t; 190 191 /* Update bitcount */ 192 193 t = ctx->bits[0]; 194 if ((ctx->bits[0] = t + ((uint32)len << 3)) < t) 195 ctx->bits[1]++; /* Carry from low to high */ 196 ctx->bits[1] += len >> 29; 197 198 t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */ 199 200 /* Handle any leading odd-sized chunks */ 201 202 if ( t ) { 203 unsigned char *p = (unsigned char *)ctx->in + t; 204 205 t = 64-t; 206 if (len < t) { 207 memcpy(p, buf, len); 208 return; 209 } 210 memcpy(p, buf, t); 211 byteReverse(ctx->in, 16); 212 MD5Transform(ctx->buf, (uint32 *)ctx->in); 213 buf += t; 214 len -= t; 215 } 216 217 /* Process data in 64-byte chunks */ 218 219 while (len >= 64) { 220 memcpy(ctx->in, buf, 64); 221 byteReverse(ctx->in, 16); 222 MD5Transform(ctx->buf, (uint32 *)ctx->in); 223 buf += 64; 224 len -= 64; 225 } 226 227 /* Handle any remaining bytes of data. */ 228 229 memcpy(ctx->in, buf, len); 230 } 231 232 /* 233 * Final wrapup - pad to 64-byte boundary with the bit pattern 234 * 1 0* (64-bit count of bits processed, MSB-first) 235 */ 236 static void MD5Final(unsigned char digest[16], MD5Context *pCtx){ 237 struct Context *ctx = (struct Context *)pCtx; 238 unsigned count; 239 unsigned char *p; 240 241 /* Compute number of bytes mod 64 */ 242 count = (ctx->bits[0] >> 3) & 0x3F; 243 244 /* Set the first char of padding to 0x80. This is safe since there is 245 always at least one byte free */ 246 p = ctx->in + count; 247 *p++ = 0x80; 248 249 /* Bytes of padding needed to make 64 bytes */ 250 count = 64 - 1 - count; 251 252 /* Pad out to 56 mod 64 */ 253 if (count < 8) { 254 /* Two lots of padding: Pad the first block to 64 bytes */ 255 memset(p, 0, count); 256 byteReverse(ctx->in, 16); 257 MD5Transform(ctx->buf, (uint32 *)ctx->in); 258 259 /* Now fill the next block with 56 bytes */ 260 memset(ctx->in, 0, 56); 261 } else { 262 /* Pad block to 56 bytes */ 263 memset(p, 0, count-8); 264 } 265 byteReverse(ctx->in, 14); 266 267 /* Append length in bits and transform */ 268 ((uint32 *)ctx->in)[ 14 ] = ctx->bits[0]; 269 ((uint32 *)ctx->in)[ 15 ] = ctx->bits[1]; 270 271 MD5Transform(ctx->buf, (uint32 *)ctx->in); 272 byteReverse((unsigned char *)ctx->buf, 4); 273 memcpy(digest, ctx->buf, 16); 274 memset(ctx, 0, sizeof(ctx)); /* In case it's sensitive */ 275 } 276 277 /* 278 ** Convert a digest into base-16. digest should be declared as 279 ** "unsigned char digest[16]" in the calling function. The MD5 280 ** digest is stored in the first 16 bytes. zBuf should 281 ** be "char zBuf[33]". 282 */ 283 static void DigestToBase16(unsigned char *digest, char *zBuf){ 284 static char const zEncode[] = "0123456789abcdef"; 285 int i, j; 286 287 for(j=i=0; i<16; i++){ 288 int a = digest[i]; 289 zBuf[j++] = zEncode[(a>>4)&0xf]; 290 zBuf[j++] = zEncode[a & 0xf]; 291 } 292 zBuf[j] = 0; 293 } 294 295 /* 296 ** A TCL command for md5. The argument is the text to be hashed. The 297 ** Result is the hash in base64. 298 */ 299 static int md5_cmd(void*cd, Tcl_Interp *interp, int argc, const char **argv){ 300 MD5Context ctx; 301 unsigned char digest[16]; 302 303 if( argc!=2 ){ 304 Tcl_AppendResult(interp,"wrong # args: should be \"", argv[0], 305 " TEXT\"", 0); 306 return TCL_ERROR; 307 } 308 MD5Init(&ctx); 309 MD5Update(&ctx, (unsigned char*)argv[1], (unsigned)strlen(argv[1])); 310 MD5Final(digest, &ctx); 311 DigestToBase16(digest, interp->result); 312 return TCL_OK; 313 } 314 315 /* 316 ** A TCL command to take the md5 hash of a file. The argument is the 317 ** name of the file. 318 */ 319 static int md5file_cmd(void*cd, Tcl_Interp*interp, int argc, const char **argv){ 320 FILE *in; 321 MD5Context ctx; 322 unsigned char digest[16]; 323 char zBuf[10240]; 324 325 if( argc!=2 ){ 326 Tcl_AppendResult(interp,"wrong # args: should be \"", argv[0], 327 " FILENAME\"", 0); 328 return TCL_ERROR; 329 } 330 in = fopen(argv[1],"rb"); 331 if( in==0 ){ 332 Tcl_AppendResult(interp,"unable to open file \"", argv[1], 333 "\" for reading", 0); 334 return TCL_ERROR; 335 } 336 MD5Init(&ctx); 337 for(;;){ 338 int n; 339 n = fread(zBuf, 1, sizeof(zBuf), in); 340 if( n<=0 ) break; 341 MD5Update(&ctx, (unsigned char*)zBuf, (unsigned)n); 342 } 343 fclose(in); 344 MD5Final(digest, &ctx); 345 DigestToBase16(digest, interp->result); 346 return TCL_OK; 347 } 348 349 /* 350 ** Register the two TCL commands above with the TCL interpreter. 351 */ 352 int Md5_Init(Tcl_Interp *interp){ 353 Tcl_CreateCommand(interp, "md5", (Tcl_CmdProc*)md5_cmd, 0, 0); 354 Tcl_CreateCommand(interp, "md5file", (Tcl_CmdProc*)md5file_cmd, 0, 0); 355 return TCL_OK; 356 } 357 358 /* 359 ** During testing, the special md5sum() aggregate function is available. 360 ** inside SQLite. The following routines implement that function. 361 */ 362 static void md5step(sqlite_func *context, int argc, const char **argv){ 363 MD5Context *p; 364 int i; 365 if( argc<1 ) return; 366 p = sqlite_aggregate_context(context, sizeof(*p)); 367 if( p==0 ) return; 368 if( sqlite_aggregate_count(context)==1 ){ 369 MD5Init(p); 370 } 371 for(i=0; i<argc; i++){ 372 if( argv[i] ){ 373 MD5Update(p, (unsigned char*)argv[i], strlen(argv[i])); 374 } 375 } 376 } 377 static void md5finalize(sqlite_func *context){ 378 MD5Context *p; 379 unsigned char digest[16]; 380 char zBuf[33]; 381 p = sqlite_aggregate_context(context, sizeof(*p)); 382 MD5Final(digest,p); 383 DigestToBase16(digest, zBuf); 384 sqlite_set_result_string(context, zBuf, strlen(zBuf)); 385 } 386 void Md5_Register(sqlite *db){ 387 sqlite_create_aggregate(db, "md5sum", -1, md5step, md5finalize, 0); 388 } 389