AryaWu/sqlite
0
1/*2** 2017-10-133**4** The author disclaims copyright to this source code. In place of5** a legal notice, here is a blessing:6**7** May you do good and not evil.8** May you find forgiveness for yourself and forgive others.9** May you share freely, never taking more than you give.10**11*************************************************************************12**13** This file contains code to implement an MD5 extension to TCL.14*/15#include "sqlite3.h"16#include <stdlib.h>17#include <string.h>18#include "sqlite3.h"19#include "tclsqlite.h"20 21/*22 * This code implements the MD5 message-digest algorithm.23 * The algorithm is due to Ron Rivest. This code was24 * written by Colin Plumb in 1993, no copyright is claimed.25 * This code is in the public domain; do with it what you wish.26 *27 * Equivalent code is available from RSA Data Security, Inc.28 * This code has been tested against that, and is equivalent,29 * except that you don't need to include two pages of legalese30 * with every copy.31 *32 * To compute the message digest of a chunk of bytes, declare an33 * MD5Context structure, pass it to MD5Init, call MD5Update as34 * needed on buffers full of bytes, and then call MD5Final, which35 * will fill a supplied 16-byte array with the digest.36 */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 an41 * unsigned 32-bit integer. For example:42 *43 * cc -Duint32='unsigned long' md5.c44 *45 */46#ifndef uint3247# define uint32 unsigned int48#endif49 50struct MD5Context {51 int isInit;52 uint32 buf[4];53 uint32 bits[2];54 unsigned char in[64];55};56typedef struct MD5Context MD5Context;57 58/*59 * Note: this code is harmless on little-endian machines.60 */61static void byteReverse (unsigned char *buf, unsigned longs){62 uint32 t;63 do {64 t = (uint32)((unsigned)buf[3]<<8 | buf[2]) << 16 |65 ((unsigned)buf[1]<<8 | buf[0]);66 *(uint32 *)buf = t;67 buf += 4;68 } while (--longs);69}70/* The four core functions - F1 is optimized somewhat */71 72/* #define F1(x, y, z) (x & y | ~x & z) */73#define F1(x, y, z) (z ^ (x & (y ^ z)))74#define F2(x, y, z) F1(z, x, y)75#define F3(x, y, z) (x ^ y ^ z)76#define F4(x, y, z) (y ^ (x | ~z))77 78/* This is the central step in the MD5 algorithm. */79#define MD5STEP(f, w, x, y, z, data, s) \80 ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )81 82/*83 * The core of the MD5 algorithm, this alters an existing MD5 hash to84 * reflect the addition of 16 longwords of new data. MD5Update blocks85 * the data and converts bytes into longwords for this routine.86 */87static void MD5Transform(uint32 buf[4], const uint32 in[16]){88 register uint32 a, b, c, d;89 90 a = buf[0];91 b = buf[1];92 c = buf[2];93 d = buf[3];94 95 MD5STEP(F1, a, b, c, d, in[ 0]+0xd76aa478, 7);96 MD5STEP(F1, d, a, b, c, in[ 1]+0xe8c7b756, 12);97 MD5STEP(F1, c, d, a, b, in[ 2]+0x242070db, 17);98 MD5STEP(F1, b, c, d, a, in[ 3]+0xc1bdceee, 22);99 MD5STEP(F1, a, b, c, d, in[ 4]+0xf57c0faf, 7);100 MD5STEP(F1, d, a, b, c, in[ 5]+0x4787c62a, 12);101 MD5STEP(F1, c, d, a, b, in[ 6]+0xa8304613, 17);102 MD5STEP(F1, b, c, d, a, in[ 7]+0xfd469501, 22);103 MD5STEP(F1, a, b, c, d, in[ 8]+0x698098d8, 7);104 MD5STEP(F1, d, a, b, c, in[ 9]+0x8b44f7af, 12);105 MD5STEP(F1, c, d, a, b, in[10]+0xffff5bb1, 17);106 MD5STEP(F1, b, c, d, a, in[11]+0x895cd7be, 22);107 MD5STEP(F1, a, b, c, d, in[12]+0x6b901122, 7);108 MD5STEP(F1, d, a, b, c, in[13]+0xfd987193, 12);109 MD5STEP(F1, c, d, a, b, in[14]+0xa679438e, 17);110 MD5STEP(F1, b, c, d, a, in[15]+0x49b40821, 22);111 112 MD5STEP(F2, a, b, c, d, in[ 1]+0xf61e2562, 5);113 MD5STEP(F2, d, a, b, c, in[ 6]+0xc040b340, 9);114 MD5STEP(F2, c, d, a, b, in[11]+0x265e5a51, 14);115 MD5STEP(F2, b, c, d, a, in[ 0]+0xe9b6c7aa, 20);116 MD5STEP(F2, a, b, c, d, in[ 5]+0xd62f105d, 5);117 MD5STEP(F2, d, a, b, c, in[10]+0x02441453, 9);118 MD5STEP(F2, c, d, a, b, in[15]+0xd8a1e681, 14);119 MD5STEP(F2, b, c, d, a, in[ 4]+0xe7d3fbc8, 20);120 MD5STEP(F2, a, b, c, d, in[ 9]+0x21e1cde6, 5);121 MD5STEP(F2, d, a, b, c, in[14]+0xc33707d6, 9);122 MD5STEP(F2, c, d, a, b, in[ 3]+0xf4d50d87, 14);123 MD5STEP(F2, b, c, d, a, in[ 8]+0x455a14ed, 20);124 MD5STEP(F2, a, b, c, d, in[13]+0xa9e3e905, 5);125 MD5STEP(F2, d, a, b, c, in[ 2]+0xfcefa3f8, 9);126 MD5STEP(F2, c, d, a, b, in[ 7]+0x676f02d9, 14);127 MD5STEP(F2, b, c, d, a, in[12]+0x8d2a4c8a, 20);128 129 MD5STEP(F3, a, b, c, d, in[ 5]+0xfffa3942, 4);130 MD5STEP(F3, d, a, b, c, in[ 8]+0x8771f681, 11);131 MD5STEP(F3, c, d, a, b, in[11]+0x6d9d6122, 16);132 MD5STEP(F3, b, c, d, a, in[14]+0xfde5380c, 23);133 MD5STEP(F3, a, b, c, d, in[ 1]+0xa4beea44, 4);134 MD5STEP(F3, d, a, b, c, in[ 4]+0x4bdecfa9, 11);135 MD5STEP(F3, c, d, a, b, in[ 7]+0xf6bb4b60, 16);136 MD5STEP(F3, b, c, d, a, in[10]+0xbebfbc70, 23);137 MD5STEP(F3, a, b, c, d, in[13]+0x289b7ec6, 4);138 MD5STEP(F3, d, a, b, c, in[ 0]+0xeaa127fa, 11);139 MD5STEP(F3, c, d, a, b, in[ 3]+0xd4ef3085, 16);140 MD5STEP(F3, b, c, d, a, in[ 6]+0x04881d05, 23);141 MD5STEP(F3, a, b, c, d, in[ 9]+0xd9d4d039, 4);142 MD5STEP(F3, d, a, b, c, in[12]+0xe6db99e5, 11);143 MD5STEP(F3, c, d, a, b, in[15]+0x1fa27cf8, 16);144 MD5STEP(F3, b, c, d, a, in[ 2]+0xc4ac5665, 23);145 146 MD5STEP(F4, a, b, c, d, in[ 0]+0xf4292244, 6);147 MD5STEP(F4, d, a, b, c, in[ 7]+0x432aff97, 10);148 MD5STEP(F4, c, d, a, b, in[14]+0xab9423a7, 15);149 MD5STEP(F4, b, c, d, a, in[ 5]+0xfc93a039, 21);150 MD5STEP(F4, a, b, c, d, in[12]+0x655b59c3, 6);151 MD5STEP(F4, d, a, b, c, in[ 3]+0x8f0ccc92, 10);152 MD5STEP(F4, c, d, a, b, in[10]+0xffeff47d, 15);153 MD5STEP(F4, b, c, d, a, in[ 1]+0x85845dd1, 21);154 MD5STEP(F4, a, b, c, d, in[ 8]+0x6fa87e4f, 6);155 MD5STEP(F4, d, a, b, c, in[15]+0xfe2ce6e0, 10);156 MD5STEP(F4, c, d, a, b, in[ 6]+0xa3014314, 15);157 MD5STEP(F4, b, c, d, a, in[13]+0x4e0811a1, 21);158 MD5STEP(F4, a, b, c, d, in[ 4]+0xf7537e82, 6);159 MD5STEP(F4, d, a, b, c, in[11]+0xbd3af235, 10);160 MD5STEP(F4, c, d, a, b, in[ 2]+0x2ad7d2bb, 15);161 MD5STEP(F4, b, c, d, a, in[ 9]+0xeb86d391, 21);162 163 buf[0] += a;164 buf[1] += b;165 buf[2] += c;166 buf[3] += d;167}168 169/*170 * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious171 * initialization constants.172 */173static void MD5Init(MD5Context *ctx){174 ctx->isInit = 1;175 ctx->buf[0] = 0x67452301;176 ctx->buf[1] = 0xefcdab89;177 ctx->buf[2] = 0x98badcfe;178 ctx->buf[3] = 0x10325476;179 ctx->bits[0] = 0;180 ctx->bits[1] = 0;181}182 183/*184 * Update context to reflect the concatenation of another buffer full185 * of bytes.186 */187static188void MD5Update(MD5Context *ctx, const unsigned char *buf, unsigned int len){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 pattern234 * 1 0* (64-bit count of bits processed, MSB-first)235 */236static void MD5Final(unsigned char digest[16], MD5Context *ctx){237 unsigned count;238 unsigned char *p;239 240 /* Compute number of bytes mod 64 */241 count = (ctx->bits[0] >> 3) & 0x3F;242 243 /* Set the first char of padding to 0x80. This is safe since there is244 always at least one byte free */245 p = ctx->in + count;246 *p++ = 0x80;247 248 /* Bytes of padding needed to make 64 bytes */249 count = 64 - 1 - count;250 251 /* Pad out to 56 mod 64 */252 if (count < 8) {253 /* Two lots of padding: Pad the first block to 64 bytes */254 memset(p, 0, count);255 byteReverse(ctx->in, 16);256 MD5Transform(ctx->buf, (uint32 *)ctx->in);257 258 /* Now fill the next block with 56 bytes */259 memset(ctx->in, 0, 56);260 } else {261 /* Pad block to 56 bytes */262 memset(p, 0, count-8);263 }264 byteReverse(ctx->in, 14);265 266 /* Append length in bits and transform */267 memcpy(ctx->in + 14*4, ctx->bits, 8);268 269 MD5Transform(ctx->buf, (uint32 *)ctx->in);270 byteReverse((unsigned char *)ctx->buf, 4);271 memcpy(digest, ctx->buf, 16);272}273 274/*275** Convert a 128-bit MD5 digest into a 32-digit base-16 number.276*/277static void MD5DigestToBase16(unsigned char *digest, char *zBuf){278 static char const zEncode[] = "0123456789abcdef";279 int i, j;280 281 for(j=i=0; i<16; i++){282 int a = digest[i];283 zBuf[j++] = zEncode[(a>>4)&0xf];284 zBuf[j++] = zEncode[a & 0xf];285 }286 zBuf[j] = 0;287}288 289 290/*291** Convert a 128-bit MD5 digest into sequences of eight 5-digit integers292** each representing 16 bits of the digest and separated from each293** other by a "-" character.294*/295static void MD5DigestToBase10x8(unsigned char digest[16], char zDigest[50]){296 int i, j;297 unsigned int x;298 for(i=j=0; i<16; i+=2){299 x = digest[i]*256 + digest[i+1];300 if( i>0 ) zDigest[j++] = '-';301 sqlite3_snprintf(50-j, &zDigest[j], "%05u", x);302 j += 5;303 }304 zDigest[j] = 0;305}306 307/*308** A TCL command for md5. The argument is the text to be hashed. The309** Result is the hash in base64.310*/311static int SQLITE_TCLAPI md5_cmd(312 void*cd,313 Tcl_Interp *interp,314 int argc,315 const char **argv316){317 MD5Context ctx;318 unsigned char digest[16];319 char zBuf[50];320 void (*converter)(unsigned char*, char*);321 322 if( argc!=2 ){323 Tcl_AppendResult(interp,"wrong # args: should be \"", argv[0],324 " TEXT\"", (char*)0);325 return TCL_ERROR;326 }327 MD5Init(&ctx);328 MD5Update(&ctx, (unsigned char*)argv[1], (unsigned)strlen(argv[1]));329 MD5Final(digest, &ctx);330 converter = (void(*)(unsigned char*,char*))cd;331 converter(digest, zBuf);332 Tcl_AppendResult(interp, zBuf, (char*)0);333 return TCL_OK;334}335 336/*337** A TCL command to take the md5 hash of a file. The argument is the338** name of the file.339*/340static int SQLITE_TCLAPI md5file_cmd(341 void*cd,342 Tcl_Interp *interp,343 int argc,344 const char **argv345){346 FILE *in;347 int ofst;348 int amt;349 MD5Context ctx;350 void (*converter)(unsigned char*, char*);351 unsigned char digest[16];352 char zBuf[10240];353 354 if( argc!=2 && argc!=4 ){355 Tcl_AppendResult(interp,"wrong # args: should be \"", argv[0],356 " FILENAME [OFFSET AMT]\"", (char*)0);357 return TCL_ERROR;358 }359 if( argc==4 ){360 ofst = atoi(argv[2]);361 amt = atoi(argv[3]);362 }else{363 ofst = 0;364 amt = 2147483647;365 }366 in = fopen(argv[1],"rb");367 if( in==0 ){368 Tcl_AppendResult(interp,"unable to open file \"", argv[1],369 "\" for reading", (char*)0);370 return TCL_ERROR;371 }372 fseek(in, ofst, SEEK_SET);373 MD5Init(&ctx);374 while( amt>0 ){375 int n;376 n = (int)fread(zBuf, 1, sizeof(zBuf)<=amt ? sizeof(zBuf) : amt, in);377 if( n<=0 ) break;378 MD5Update(&ctx, (unsigned char*)zBuf, (unsigned)n);379 amt -= n;380 }381 fclose(in);382 MD5Final(digest, &ctx);383 converter = (void(*)(unsigned char*,char*))cd;384 converter(digest, zBuf);385 Tcl_AppendResult(interp, zBuf, (char*)0);386 return TCL_OK;387}388 389/*390** Register the four new TCL commands for generating MD5 checksums391** with the TCL interpreter.392*/393int Md5_Init(Tcl_Interp *interp){394 Tcl_CreateCommand(interp, "md5", (Tcl_CmdProc*)md5_cmd,395 MD5DigestToBase16, 0);396 Tcl_CreateCommand(interp, "md5-10x8", (Tcl_CmdProc*)md5_cmd,397 MD5DigestToBase10x8, 0);398 Tcl_CreateCommand(interp, "md5file", (Tcl_CmdProc*)md5file_cmd,399 MD5DigestToBase16, 0);400 Tcl_CreateCommand(interp, "md5file-10x8", (Tcl_CmdProc*)md5file_cmd,401 MD5DigestToBase10x8, 0);402 return TCL_OK;403}404 405/*406** During testing, the special md5sum() aggregate function is available.407** inside SQLite. The following routines implement that function.408*/409static void md5step(sqlite3_context *context, int argc, sqlite3_value **argv){410 MD5Context *p;411 int i;412 if( argc<1 ) return;413 p = sqlite3_aggregate_context(context, sizeof(*p));414 if( p==0 ) return;415 if( !p->isInit ){416 MD5Init(p);417 }418 for(i=0; i<argc; i++){419 const char *zData = (char*)sqlite3_value_text(argv[i]);420 if( zData ){421 MD5Update(p, (unsigned char*)zData, (int)strlen(zData));422 }423 }424}425static void md5finalize(sqlite3_context *context){426 MD5Context *p;427 unsigned char digest[16];428 char zBuf[33];429 p = sqlite3_aggregate_context(context, sizeof(*p));430 MD5Final(digest,p);431 MD5DigestToBase16(digest, zBuf);432 sqlite3_result_text(context, zBuf, -1, SQLITE_TRANSIENT);433}434int Md5_Register(435 sqlite3 *db,436 char **pzErrMsg,437 const sqlite3_api_routines *pThunk438){439 int rc = sqlite3_create_function(db, "md5sum", -1, SQLITE_UTF8, 0, 0,440 md5step, md5finalize);441 sqlite3_overload_function(db, "md5sum", -1); /* To exercise this API */442 return rc;443}444