/*

 **

 ** Portions Copyright (c) 2008 Nokia Corporation and/or its subsidiaries. All rights reserved.

 **

 ** SQLite uses this code for testing only.  It is not a part of

 ** the SQLite library.  This file implements two new TCL commands

 ** "md5" and "md5file" that compute md5 checksums on arbitrary text

 ** and on complete files.  These commands are used by the "testfixture"

 ** program to help verify the correct operation of the SQLite library.

 **

 ** The original use of these TCL commands was to test the ROLLBACK

 ** feature of SQLite.  First compute the MD5-checksum of the database.

 ** Then make some changes but rollback the changes rather than commit

 ** them.  Compute a second MD5-checksum of the file and verify that the

 ** two checksums are the same.  Such is the original use of this code.

 ** New uses may have been added since this comment was written.

 **

 ** $Id: test_md5.c,v 1.8 2008/05/16 04:51:55 danielk1977 Exp $

 */

 /*

  * This code implements the MD5 message-digest algorithm.

  * The algorithm is due to Ron Rivest.  This code was

  * written by Colin Plumb in 1993, no copyright is claimed.

  * This code is in the public domain; do with it what you wish.

  *

  * Equivalent code is available from RSA Data Security, Inc.

  * This code has been tested against that, and is equivalent,

  * except that you don't need to include two pages of legalese

  * with every copy.

  *

  * To compute the message digest of a chunk of bytes, declare an

  * MD5Context structure, pass it to MD5Init, call MD5Update as

  * needed on buffers full of bytes, and then call MD5Final, which

  * will fill a supplied 16-byte array with the digest.

  */

 #include "tcl.h"

 #include <string.h>

 #include "sqlite3.h"

 #include <sys/param.h>

 /* Symbian OS */

 extern char* GetFullFilePath(char* aPath, const char* aFileName);

 /*

  * If compiled on a machine that doesn't have a 32-bit integer,

  * you just set "uint32" to the appropriate datatype for an

  * unsigned 32-bit integer.  For example:

  *

  *       cc -Duint32='unsigned long' md5.c

  *

  */

 #ifndef uint32

 #  define uint32 unsigned int

 #endif

 struct Context {

   int isInit;

   uint32 buf[4];

   uint32 bits[2];

   unsigned char in[64];

 };

 typedef struct Context MD5Context;

 /*

  * Note: this code is harmless on little-endian machines.

  */

 static void byteReverse (unsigned char *buf, unsigned longs){

         uint32 t;

         do {

                 t = (uint32)((unsigned)buf[3]<<8 | buf[2]) << 16 |

                             ((unsigned)buf[1]<<8 | buf[0]);

                 *(uint32 *)buf = t;

                 buf += 4;

         } while (--longs);

 }

 /* The four core functions - F1 is optimized somewhat */

 /* #define F1(x, y, z) (x & y | ~x & z) */

 #define F1(x, y, z) (z ^ (x & (y ^ z)))

 #define F2(x, y, z) F1(z, x, y)

 #define F3(x, y, z) (x ^ y ^ z)

 #define F4(x, y, z) (y ^ (x | ~z))

 /* This is the central step in the MD5 algorithm. */

 #define MD5STEP(f, w, x, y, z, data, s) \

         ( w += f(x, y, z) + data,  w = w<<s | w>>(32-s),  w += x )

 /*

  * The core of the MD5 algorithm, this alters an existing MD5 hash to

  * reflect the addition of 16 longwords of new data.  MD5Update blocks

  * the data and converts bytes into longwords for this routine.

  */

 static void MD5Transform(uint32 buf[4], const uint32 in[16]){

         register uint32 a, b, c, d;

         a = buf[0];

         b = buf[1];

         c = buf[2];

         d = buf[3];

         MD5STEP(F1, a, b, c, d, in[ 0]+0xd76aa478,  7);

         MD5STEP(F1, d, a, b, c, in[ 1]+0xe8c7b756, 12);

         MD5STEP(F1, c, d, a, b, in[ 2]+0x242070db, 17);

         MD5STEP(F1, b, c, d, a, in[ 3]+0xc1bdceee, 22);

         MD5STEP(F1, a, b, c, d, in[ 4]+0xf57c0faf,  7);

         MD5STEP(F1, d, a, b, c, in[ 5]+0x4787c62a, 12);

         MD5STEP(F1, c, d, a, b, in[ 6]+0xa8304613, 17);

         MD5STEP(F1, b, c, d, a, in[ 7]+0xfd469501, 22);

         MD5STEP(F1, a, b, c, d, in[ 8]+0x698098d8,  7);

         MD5STEP(F1, d, a, b, c, in[ 9]+0x8b44f7af, 12);

         MD5STEP(F1, c, d, a, b, in[10]+0xffff5bb1, 17);

         MD5STEP(F1, b, c, d, a, in[11]+0x895cd7be, 22);

         MD5STEP(F1, a, b, c, d, in[12]+0x6b901122,  7);

         MD5STEP(F1, d, a, b, c, in[13]+0xfd987193, 12);

         MD5STEP(F1, c, d, a, b, in[14]+0xa679438e, 17);

         MD5STEP(F1, b, c, d, a, in[15]+0x49b40821, 22);

         MD5STEP(F2, a, b, c, d, in[ 1]+0xf61e2562,  5);

         MD5STEP(F2, d, a, b, c, in[ 6]+0xc040b340,  9);

         MD5STEP(F2, c, d, a, b, in[11]+0x265e5a51, 14);

         MD5STEP(F2, b, c, d, a, in[ 0]+0xe9b6c7aa, 20);

         MD5STEP(F2, a, b, c, d, in[ 5]+0xd62f105d,  5);

         MD5STEP(F2, d, a, b, c, in[10]+0x02441453,  9);

         MD5STEP(F2, c, d, a, b, in[15]+0xd8a1e681, 14);

         MD5STEP(F2, b, c, d, a, in[ 4]+0xe7d3fbc8, 20);

         MD5STEP(F2, a, b, c, d, in[ 9]+0x21e1cde6,  5);

         MD5STEP(F2, d, a, b, c, in[14]+0xc33707d6,  9);

         MD5STEP(F2, c, d, a, b, in[ 3]+0xf4d50d87, 14);

         MD5STEP(F2, b, c, d, a, in[ 8]+0x455a14ed, 20);

         MD5STEP(F2, a, b, c, d, in[13]+0xa9e3e905,  5);

         MD5STEP(F2, d, a, b, c, in[ 2]+0xfcefa3f8,  9);

         MD5STEP(F2, c, d, a, b, in[ 7]+0x676f02d9, 14);

         MD5STEP(F2, b, c, d, a, in[12]+0x8d2a4c8a, 20);

         MD5STEP(F3, a, b, c, d, in[ 5]+0xfffa3942,  4);

         MD5STEP(F3, d, a, b, c, in[ 8]+0x8771f681, 11);

         MD5STEP(F3, c, d, a, b, in[11]+0x6d9d6122, 16);

         MD5STEP(F3, b, c, d, a, in[14]+0xfde5380c, 23);

         MD5STEP(F3, a, b, c, d, in[ 1]+0xa4beea44,  4);

         MD5STEP(F3, d, a, b, c, in[ 4]+0x4bdecfa9, 11);

         MD5STEP(F3, c, d, a, b, in[ 7]+0xf6bb4b60, 16);

         MD5STEP(F3, b, c, d, a, in[10]+0xbebfbc70, 23);

         MD5STEP(F3, a, b, c, d, in[13]+0x289b7ec6,  4);

         MD5STEP(F3, d, a, b, c, in[ 0]+0xeaa127fa, 11);

         MD5STEP(F3, c, d, a, b, in[ 3]+0xd4ef3085, 16);

         MD5STEP(F3, b, c, d, a, in[ 6]+0x04881d05, 23);

         MD5STEP(F3, a, b, c, d, in[ 9]+0xd9d4d039,  4);

         MD5STEP(F3, d, a, b, c, in[12]+0xe6db99e5, 11);

         MD5STEP(F3, c, d, a, b, in[15]+0x1fa27cf8, 16);

         MD5STEP(F3, b, c, d, a, in[ 2]+0xc4ac5665, 23);

         MD5STEP(F4, a, b, c, d, in[ 0]+0xf4292244,  6);

         MD5STEP(F4, d, a, b, c, in[ 7]+0x432aff97, 10);

         MD5STEP(F4, c, d, a, b, in[14]+0xab9423a7, 15);

         MD5STEP(F4, b, c, d, a, in[ 5]+0xfc93a039, 21);

         MD5STEP(F4, a, b, c, d, in[12]+0x655b59c3,  6);

         MD5STEP(F4, d, a, b, c, in[ 3]+0x8f0ccc92, 10);

         MD5STEP(F4, c, d, a, b, in[10]+0xffeff47d, 15);

         MD5STEP(F4, b, c, d, a, in[ 1]+0x85845dd1, 21);

         MD5STEP(F4, a, b, c, d, in[ 8]+0x6fa87e4f,  6);

         MD5STEP(F4, d, a, b, c, in[15]+0xfe2ce6e0, 10);

         MD5STEP(F4, c, d, a, b, in[ 6]+0xa3014314, 15);

         MD5STEP(F4, b, c, d, a, in[13]+0x4e0811a1, 21);

         MD5STEP(F4, a, b, c, d, in[ 4]+0xf7537e82,  6);

         MD5STEP(F4, d, a, b, c, in[11]+0xbd3af235, 10);

         MD5STEP(F4, c, d, a, b, in[ 2]+0x2ad7d2bb, 15);

         MD5STEP(F4, b, c, d, a, in[ 9]+0xeb86d391, 21);

         buf[0] += a;

         buf[1] += b;

         buf[2] += c;

         buf[3] += d;

 }

 /*

  * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious

  * initialization constants.

  */

 static void MD5Init(MD5Context *ctx){

         ctx->isInit = 1;

         ctx->buf[0] = 0x67452301;

         ctx->buf[1] = 0xefcdab89;

         ctx->buf[2] = 0x98badcfe;

         ctx->buf[3] = 0x10325476;

         ctx->bits[0] = 0;

         ctx->bits[1] = 0;

 }

 /*

  * Update context to reflect the concatenation of another buffer full

  * of bytes.

  */

 static 

 void MD5Update(MD5Context *pCtx, const unsigned char *buf, unsigned int len){

         struct Context *ctx = (struct Context *)pCtx;

         uint32 t;

         /* Update bitcount */

         t = ctx->bits[0];

         if ((ctx->bits[0] = t + ((uint32)len << 3)) < t)

                 ctx->bits[1]++; /* Carry from low to high */

         ctx->bits[1] += len >> 29;

         t = (t >> 3) & 0x3f;    /* Bytes already in shsInfo->data */

         /* Handle any leading odd-sized chunks */

         if ( t ) {

                 unsigned char *p = (unsigned char *)ctx->in + t;

                 t = 64-t;

                 if (len < t) {

                         memcpy(p, buf, len);

                         return;

                 }

                 memcpy(p, buf, t);

                 byteReverse(ctx->in, 16);

                 MD5Transform(ctx->buf, (uint32 *)ctx->in);

                 buf += t;

                 len -= t;

         }

         /* Process data in 64-byte chunks */

         while (len >= 64) {

                 memcpy(ctx->in, buf, 64);

                 byteReverse(ctx->in, 16);

                 MD5Transform(ctx->buf, (uint32 *)ctx->in);

                 buf += 64;

                 len -= 64;

         }

         /* Handle any remaining bytes of data. */

         memcpy(ctx->in, buf, len);

 }

 /*

  * Final wrapup - pad to 64-byte boundary with the bit pattern 

  * 1 0* (64-bit count of bits processed, MSB-first)

  */

 static void MD5Final(unsigned char digest[16], MD5Context *pCtx){

         struct Context *ctx = (struct Context *)pCtx;

         unsigned count;

         unsigned char *p;

         /* Compute number of bytes mod 64 */

         count = (ctx->bits[0] >> 3) & 0x3F;

         /* Set the first char of padding to 0x80.  This is safe since there is

            always at least one byte free */

         p = ctx->in + count;

         *p++ = 0x80;

         /* Bytes of padding needed to make 64 bytes */

         count = 64 - 1 - count;

         /* Pad out to 56 mod 64 */

         if (count < 8) {

                 /* Two lots of padding:  Pad the first block to 64 bytes */

                 memset(p, 0, count);

                 byteReverse(ctx->in, 16);

                 MD5Transform(ctx->buf, (uint32 *)ctx->in);

                 /* Now fill the next block with 56 bytes */

                 memset(ctx->in, 0, 56);

         } else {

                 /* Pad block to 56 bytes */

                 memset(p, 0, count-8);

         }

         byteReverse(ctx->in, 14);

         /* Append length in bits and transform */

         ((uint32 *)ctx->in)[ 14 ] = ctx->bits[0];

         ((uint32 *)ctx->in)[ 15 ] = ctx->bits[1];

         MD5Transform(ctx->buf, (uint32 *)ctx->in);

         byteReverse((unsigned char *)ctx->buf, 4);

         memcpy(digest, ctx->buf, 16);

         memset(ctx, 0, sizeof(ctx));    /* In case it is sensitive */

 }

 /*

 ** Convert a digest into base-16.  digest should be declared as

 ** "unsigned char digest[16]" in the calling function.  The MD5

 ** digest is stored in the first 16 bytes.  zBuf should

 ** be "char zBuf[33]".

 */

 static void DigestToBase16(unsigned char *digest, char *zBuf){

   static char const zEncode[] = "0123456789abcdef";

   int i, j;

   for(j=i=0; i<16; i++){

     int a = digest[i];

     zBuf[j++] = zEncode[(a>>4)&0xf];

     zBuf[j++] = zEncode[a & 0xf];

   }

   zBuf[j] = 0;

 }

 /*

 ** A TCL command for md5.  The argument is the text to be hashed.  The

 ** Result is the hash in base64.  

 */

 static int md5_cmd(void*cd, Tcl_Interp *interp, int argc, const char **argv){

   MD5Context ctx;

   unsigned char digest[16];

   if( argc!=2 ){

     Tcl_AppendResult(interp,"wrong # args: should be \"", argv[0], 

         " TEXT\"", 0);

     return TCL_ERROR;

   }

   MD5Init(&ctx);

   MD5Update(&ctx, (unsigned char*)argv[1], (unsigned)strlen(argv[1]));

   MD5Final(digest, &ctx);

   DigestToBase16(digest, interp->result);

   return TCL_OK;

 }

 /*

 ** A TCL command to take the md5 hash of a file.  The argument is the

 ** name of the file.

 */

 static int md5file_cmd(void*cd, Tcl_Interp*interp, int argc, const char **argv){

   FILE *in;

   MD5Context ctx;

   unsigned char digest[16];

   char zBuf[10240];

   char fnamebuf[MAXPATHLEN + 1];

   if( argc!=2 ){

     Tcl_AppendResult(interp,"wrong # args: should be \"", argv[0], 

         " FILENAME\"", 0);

     return TCL_ERROR;

   }

   if(GetFullFilePath(fnamebuf, argv[1]) == 0)

     return TCL_ERROR;

   in = fopen(fnamebuf,"rb");

   if( in==0 ){

     Tcl_AppendResult(interp,"unable to open file \"", fnamebuf, "\" for reading", 0);

     return TCL_ERROR;

   }

   MD5Init(&ctx);

   for(;;){

     int n;

     n = fread(zBuf, 1, sizeof(zBuf), in);

     if( n<=0 ) break;

     MD5Update(&ctx, (unsigned char*)zBuf, (unsigned)n);

   }

   fclose(in);

   MD5Final(digest, &ctx);

   DigestToBase16(digest, interp->result);

   return TCL_OK;

 }

 /*

 ** Register the two TCL commands above with the TCL interpreter.

 */

 int Md5_Init(Tcl_Interp *interp){

   Tcl_CreateCommand(interp, "md5", (Tcl_CmdProc*)md5_cmd, 0, 0);

   Tcl_CreateCommand(interp, "md5file", (Tcl_CmdProc*)md5file_cmd, 0, 0);

   return TCL_OK;

 }

 /*

 ** During testing, the special md5sum() aggregate function is available.

 ** inside SQLite.  The following routines implement that function.

 */

 static void md5step(sqlite3_context *context, int argc, sqlite3_value **argv){

   MD5Context *p;

   int i;

   if( argc<1 ) return;

   p = sqlite3_aggregate_context(context, sizeof(*p));

   if( p==0 ) return;

   if( !p->isInit ){

     MD5Init(p);

   }

   for(i=0; i<argc; i++){

     const char *zData = (char*)sqlite3_value_text(argv[i]);

     if( zData ){

       MD5Update(p, (unsigned char*)zData, strlen(zData));

     }

   }

 }

 static void md5finalize(sqlite3_context *context){

   MD5Context *p;

   unsigned char digest[16];

   char zBuf[33];

   p = sqlite3_aggregate_context(context, sizeof(*p));

   MD5Final(digest,p);

   DigestToBase16(digest, zBuf);

   sqlite3_result_text(context, zBuf, -1, SQLITE_TRANSIENT);

 }

 int Md5_Register(sqlite3 *db){

   int rc = sqlite3_create_function(db, "md5sum", -1, SQLITE_UTF8, 0, 0, 

                                  md5step, md5finalize);

   sqlite3_overload_function(db, "md5sum", -1);  /* To exercise this API */

   return rc;

 }