mirror of
https://github.com/tursodatabase/libsql.git
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451 lines
14 KiB
C
451 lines
14 KiB
C
/*
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** 2017-10-13
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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**
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** This file contains code to implement an MD5 extension to TCL.
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*/
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#include "sqlite3.h"
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#include <stdlib.h>
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#include <string.h>
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#include "sqlite3.h"
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#if defined(INCLUDE_SQLITE_TCL_H)
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# include "sqlite_tcl.h"
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#else
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# include "tcl.h"
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# ifndef SQLITE_TCLAPI
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# define SQLITE_TCLAPI
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# endif
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#endif
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/*
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* This code implements the MD5 message-digest algorithm.
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* The algorithm is due to Ron Rivest. This code was
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* written by Colin Plumb in 1993, no copyright is claimed.
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* This code is in the public domain; do with it what you wish.
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*
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* Equivalent code is available from RSA Data Security, Inc.
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* This code has been tested against that, and is equivalent,
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* except that you don't need to include two pages of legalese
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* with every copy.
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*
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* To compute the message digest of a chunk of bytes, declare an
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* MD5Context structure, pass it to MD5Init, call MD5Update as
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* needed on buffers full of bytes, and then call MD5Final, which
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* will fill a supplied 16-byte array with the digest.
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*/
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/*
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* If compiled on a machine that doesn't have a 32-bit integer,
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* you just set "uint32" to the appropriate datatype for an
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* unsigned 32-bit integer. For example:
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*
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* cc -Duint32='unsigned long' md5.c
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*
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*/
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#ifndef uint32
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# define uint32 unsigned int
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#endif
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struct MD5Context {
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int isInit;
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uint32 buf[4];
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uint32 bits[2];
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unsigned char in[64];
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};
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typedef struct MD5Context MD5Context;
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/*
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* Note: this code is harmless on little-endian machines.
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*/
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static void byteReverse (unsigned char *buf, unsigned longs){
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uint32 t;
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do {
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t = (uint32)((unsigned)buf[3]<<8 | buf[2]) << 16 |
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((unsigned)buf[1]<<8 | buf[0]);
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*(uint32 *)buf = t;
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buf += 4;
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} while (--longs);
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}
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/* The four core functions - F1 is optimized somewhat */
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/* #define F1(x, y, z) (x & y | ~x & z) */
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#define F1(x, y, z) (z ^ (x & (y ^ z)))
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#define F2(x, y, z) F1(z, x, y)
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#define F3(x, y, z) (x ^ y ^ z)
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#define F4(x, y, z) (y ^ (x | ~z))
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/* This is the central step in the MD5 algorithm. */
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#define MD5STEP(f, w, x, y, z, data, s) \
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( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
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/*
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* The core of the MD5 algorithm, this alters an existing MD5 hash to
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* reflect the addition of 16 longwords of new data. MD5Update blocks
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* the data and converts bytes into longwords for this routine.
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*/
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static void MD5Transform(uint32 buf[4], const uint32 in[16]){
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register uint32 a, b, c, d;
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a = buf[0];
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b = buf[1];
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c = buf[2];
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d = buf[3];
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MD5STEP(F1, a, b, c, d, in[ 0]+0xd76aa478, 7);
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MD5STEP(F1, d, a, b, c, in[ 1]+0xe8c7b756, 12);
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MD5STEP(F1, c, d, a, b, in[ 2]+0x242070db, 17);
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MD5STEP(F1, b, c, d, a, in[ 3]+0xc1bdceee, 22);
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MD5STEP(F1, a, b, c, d, in[ 4]+0xf57c0faf, 7);
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MD5STEP(F1, d, a, b, c, in[ 5]+0x4787c62a, 12);
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MD5STEP(F1, c, d, a, b, in[ 6]+0xa8304613, 17);
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MD5STEP(F1, b, c, d, a, in[ 7]+0xfd469501, 22);
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MD5STEP(F1, a, b, c, d, in[ 8]+0x698098d8, 7);
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MD5STEP(F1, d, a, b, c, in[ 9]+0x8b44f7af, 12);
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MD5STEP(F1, c, d, a, b, in[10]+0xffff5bb1, 17);
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MD5STEP(F1, b, c, d, a, in[11]+0x895cd7be, 22);
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MD5STEP(F1, a, b, c, d, in[12]+0x6b901122, 7);
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MD5STEP(F1, d, a, b, c, in[13]+0xfd987193, 12);
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MD5STEP(F1, c, d, a, b, in[14]+0xa679438e, 17);
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MD5STEP(F1, b, c, d, a, in[15]+0x49b40821, 22);
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MD5STEP(F2, a, b, c, d, in[ 1]+0xf61e2562, 5);
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MD5STEP(F2, d, a, b, c, in[ 6]+0xc040b340, 9);
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MD5STEP(F2, c, d, a, b, in[11]+0x265e5a51, 14);
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MD5STEP(F2, b, c, d, a, in[ 0]+0xe9b6c7aa, 20);
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MD5STEP(F2, a, b, c, d, in[ 5]+0xd62f105d, 5);
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MD5STEP(F2, d, a, b, c, in[10]+0x02441453, 9);
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MD5STEP(F2, c, d, a, b, in[15]+0xd8a1e681, 14);
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MD5STEP(F2, b, c, d, a, in[ 4]+0xe7d3fbc8, 20);
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MD5STEP(F2, a, b, c, d, in[ 9]+0x21e1cde6, 5);
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MD5STEP(F2, d, a, b, c, in[14]+0xc33707d6, 9);
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MD5STEP(F2, c, d, a, b, in[ 3]+0xf4d50d87, 14);
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MD5STEP(F2, b, c, d, a, in[ 8]+0x455a14ed, 20);
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MD5STEP(F2, a, b, c, d, in[13]+0xa9e3e905, 5);
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MD5STEP(F2, d, a, b, c, in[ 2]+0xfcefa3f8, 9);
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MD5STEP(F2, c, d, a, b, in[ 7]+0x676f02d9, 14);
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MD5STEP(F2, b, c, d, a, in[12]+0x8d2a4c8a, 20);
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MD5STEP(F3, a, b, c, d, in[ 5]+0xfffa3942, 4);
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MD5STEP(F3, d, a, b, c, in[ 8]+0x8771f681, 11);
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MD5STEP(F3, c, d, a, b, in[11]+0x6d9d6122, 16);
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MD5STEP(F3, b, c, d, a, in[14]+0xfde5380c, 23);
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MD5STEP(F3, a, b, c, d, in[ 1]+0xa4beea44, 4);
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MD5STEP(F3, d, a, b, c, in[ 4]+0x4bdecfa9, 11);
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MD5STEP(F3, c, d, a, b, in[ 7]+0xf6bb4b60, 16);
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MD5STEP(F3, b, c, d, a, in[10]+0xbebfbc70, 23);
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MD5STEP(F3, a, b, c, d, in[13]+0x289b7ec6, 4);
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MD5STEP(F3, d, a, b, c, in[ 0]+0xeaa127fa, 11);
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MD5STEP(F3, c, d, a, b, in[ 3]+0xd4ef3085, 16);
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MD5STEP(F3, b, c, d, a, in[ 6]+0x04881d05, 23);
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MD5STEP(F3, a, b, c, d, in[ 9]+0xd9d4d039, 4);
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MD5STEP(F3, d, a, b, c, in[12]+0xe6db99e5, 11);
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MD5STEP(F3, c, d, a, b, in[15]+0x1fa27cf8, 16);
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MD5STEP(F3, b, c, d, a, in[ 2]+0xc4ac5665, 23);
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MD5STEP(F4, a, b, c, d, in[ 0]+0xf4292244, 6);
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MD5STEP(F4, d, a, b, c, in[ 7]+0x432aff97, 10);
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MD5STEP(F4, c, d, a, b, in[14]+0xab9423a7, 15);
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MD5STEP(F4, b, c, d, a, in[ 5]+0xfc93a039, 21);
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MD5STEP(F4, a, b, c, d, in[12]+0x655b59c3, 6);
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MD5STEP(F4, d, a, b, c, in[ 3]+0x8f0ccc92, 10);
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MD5STEP(F4, c, d, a, b, in[10]+0xffeff47d, 15);
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MD5STEP(F4, b, c, d, a, in[ 1]+0x85845dd1, 21);
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MD5STEP(F4, a, b, c, d, in[ 8]+0x6fa87e4f, 6);
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MD5STEP(F4, d, a, b, c, in[15]+0xfe2ce6e0, 10);
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MD5STEP(F4, c, d, a, b, in[ 6]+0xa3014314, 15);
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MD5STEP(F4, b, c, d, a, in[13]+0x4e0811a1, 21);
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MD5STEP(F4, a, b, c, d, in[ 4]+0xf7537e82, 6);
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MD5STEP(F4, d, a, b, c, in[11]+0xbd3af235, 10);
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MD5STEP(F4, c, d, a, b, in[ 2]+0x2ad7d2bb, 15);
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MD5STEP(F4, b, c, d, a, in[ 9]+0xeb86d391, 21);
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buf[0] += a;
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buf[1] += b;
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buf[2] += c;
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buf[3] += d;
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}
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/*
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* Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
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* initialization constants.
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*/
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static void MD5Init(MD5Context *ctx){
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ctx->isInit = 1;
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ctx->buf[0] = 0x67452301;
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ctx->buf[1] = 0xefcdab89;
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ctx->buf[2] = 0x98badcfe;
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ctx->buf[3] = 0x10325476;
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ctx->bits[0] = 0;
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ctx->bits[1] = 0;
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}
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/*
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* Update context to reflect the concatenation of another buffer full
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* of bytes.
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*/
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static
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void MD5Update(MD5Context *ctx, const unsigned char *buf, unsigned int len){
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uint32 t;
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/* Update bitcount */
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t = ctx->bits[0];
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if ((ctx->bits[0] = t + ((uint32)len << 3)) < t)
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ctx->bits[1]++; /* Carry from low to high */
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ctx->bits[1] += len >> 29;
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t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */
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/* Handle any leading odd-sized chunks */
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if ( t ) {
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unsigned char *p = (unsigned char *)ctx->in + t;
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t = 64-t;
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if (len < t) {
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memcpy(p, buf, len);
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return;
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}
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memcpy(p, buf, t);
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byteReverse(ctx->in, 16);
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MD5Transform(ctx->buf, (uint32 *)ctx->in);
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buf += t;
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len -= t;
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}
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/* Process data in 64-byte chunks */
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while (len >= 64) {
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memcpy(ctx->in, buf, 64);
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byteReverse(ctx->in, 16);
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MD5Transform(ctx->buf, (uint32 *)ctx->in);
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buf += 64;
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len -= 64;
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}
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/* Handle any remaining bytes of data. */
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memcpy(ctx->in, buf, len);
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}
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/*
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* Final wrapup - pad to 64-byte boundary with the bit pattern
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* 1 0* (64-bit count of bits processed, MSB-first)
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*/
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static void MD5Final(unsigned char digest[16], MD5Context *ctx){
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unsigned count;
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unsigned char *p;
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/* Compute number of bytes mod 64 */
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count = (ctx->bits[0] >> 3) & 0x3F;
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/* Set the first char of padding to 0x80. This is safe since there is
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always at least one byte free */
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p = ctx->in + count;
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*p++ = 0x80;
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/* Bytes of padding needed to make 64 bytes */
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count = 64 - 1 - count;
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/* Pad out to 56 mod 64 */
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if (count < 8) {
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/* Two lots of padding: Pad the first block to 64 bytes */
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memset(p, 0, count);
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byteReverse(ctx->in, 16);
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MD5Transform(ctx->buf, (uint32 *)ctx->in);
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/* Now fill the next block with 56 bytes */
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memset(ctx->in, 0, 56);
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} else {
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/* Pad block to 56 bytes */
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memset(p, 0, count-8);
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}
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byteReverse(ctx->in, 14);
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/* Append length in bits and transform */
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memcpy(ctx->in + 14*4, ctx->bits, 8);
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MD5Transform(ctx->buf, (uint32 *)ctx->in);
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byteReverse((unsigned char *)ctx->buf, 4);
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memcpy(digest, ctx->buf, 16);
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}
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/*
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** Convert a 128-bit MD5 digest into a 32-digit base-16 number.
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*/
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static void MD5DigestToBase16(unsigned char *digest, char *zBuf){
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static char const zEncode[] = "0123456789abcdef";
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int i, j;
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for(j=i=0; i<16; i++){
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int a = digest[i];
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zBuf[j++] = zEncode[(a>>4)&0xf];
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zBuf[j++] = zEncode[a & 0xf];
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}
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zBuf[j] = 0;
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}
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/*
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** Convert a 128-bit MD5 digest into sequences of eight 5-digit integers
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** each representing 16 bits of the digest and separated from each
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** other by a "-" character.
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*/
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static void MD5DigestToBase10x8(unsigned char digest[16], char zDigest[50]){
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int i, j;
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unsigned int x;
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for(i=j=0; i<16; i+=2){
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x = digest[i]*256 + digest[i+1];
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if( i>0 ) zDigest[j++] = '-';
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sqlite3_snprintf(50-j, &zDigest[j], "%05u", x);
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j += 5;
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}
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zDigest[j] = 0;
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}
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/*
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** A TCL command for md5. The argument is the text to be hashed. The
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** Result is the hash in base64.
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*/
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static int SQLITE_TCLAPI md5_cmd(
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void*cd,
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Tcl_Interp *interp,
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int argc,
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const char **argv
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){
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MD5Context ctx;
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unsigned char digest[16];
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char zBuf[50];
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void (*converter)(unsigned char*, char*);
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if( argc!=2 ){
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Tcl_AppendResult(interp,"wrong # args: should be \"", argv[0],
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" TEXT\"", (char*)0);
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return TCL_ERROR;
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}
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MD5Init(&ctx);
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MD5Update(&ctx, (unsigned char*)argv[1], (unsigned)strlen(argv[1]));
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MD5Final(digest, &ctx);
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converter = (void(*)(unsigned char*,char*))cd;
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converter(digest, zBuf);
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Tcl_AppendResult(interp, zBuf, (char*)0);
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return TCL_OK;
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}
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/*
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** A TCL command to take the md5 hash of a file. The argument is the
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** name of the file.
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*/
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static int SQLITE_TCLAPI md5file_cmd(
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void*cd,
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Tcl_Interp *interp,
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int argc,
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const char **argv
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){
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FILE *in;
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int ofst;
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int amt;
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MD5Context ctx;
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void (*converter)(unsigned char*, char*);
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unsigned char digest[16];
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char zBuf[10240];
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if( argc!=2 && argc!=4 ){
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Tcl_AppendResult(interp,"wrong # args: should be \"", argv[0],
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" FILENAME [OFFSET AMT]\"", (char*)0);
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return TCL_ERROR;
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}
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if( argc==4 ){
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ofst = atoi(argv[2]);
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amt = atoi(argv[3]);
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}else{
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ofst = 0;
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amt = 2147483647;
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}
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in = fopen(argv[1],"rb");
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if( in==0 ){
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Tcl_AppendResult(interp,"unable to open file \"", argv[1],
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"\" for reading", (char*)0);
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return TCL_ERROR;
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}
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fseek(in, ofst, SEEK_SET);
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MD5Init(&ctx);
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while( amt>0 ){
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int n;
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n = (int)fread(zBuf, 1, sizeof(zBuf)<=amt ? sizeof(zBuf) : amt, in);
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if( n<=0 ) break;
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MD5Update(&ctx, (unsigned char*)zBuf, (unsigned)n);
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amt -= n;
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}
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fclose(in);
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MD5Final(digest, &ctx);
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converter = (void(*)(unsigned char*,char*))cd;
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converter(digest, zBuf);
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Tcl_AppendResult(interp, zBuf, (char*)0);
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return TCL_OK;
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}
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/*
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** Register the four new TCL commands for generating MD5 checksums
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** with the TCL interpreter.
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*/
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int Md5_Init(Tcl_Interp *interp){
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Tcl_CreateCommand(interp, "md5", (Tcl_CmdProc*)md5_cmd,
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MD5DigestToBase16, 0);
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Tcl_CreateCommand(interp, "md5-10x8", (Tcl_CmdProc*)md5_cmd,
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MD5DigestToBase10x8, 0);
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Tcl_CreateCommand(interp, "md5file", (Tcl_CmdProc*)md5file_cmd,
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MD5DigestToBase16, 0);
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Tcl_CreateCommand(interp, "md5file-10x8", (Tcl_CmdProc*)md5file_cmd,
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MD5DigestToBase10x8, 0);
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return TCL_OK;
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}
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/*
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** During testing, the special md5sum() aggregate function is available.
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** inside SQLite. The following routines implement that function.
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*/
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static void md5step(sqlite3_context *context, int argc, sqlite3_value **argv){
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MD5Context *p;
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int i;
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if( argc<1 ) return;
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p = sqlite3_aggregate_context(context, sizeof(*p));
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if( p==0 ) return;
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if( !p->isInit ){
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MD5Init(p);
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}
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for(i=0; i<argc; i++){
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const char *zData = (char*)sqlite3_value_text(argv[i]);
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if( zData ){
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MD5Update(p, (unsigned char*)zData, (int)strlen(zData));
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}
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}
|
|
}
|
|
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);
|
|
MD5DigestToBase16(digest, zBuf);
|
|
sqlite3_result_text(context, zBuf, -1, SQLITE_TRANSIENT);
|
|
}
|
|
int Md5_Register(
|
|
sqlite3 *db,
|
|
char **pzErrMsg,
|
|
const sqlite3_api_routines *pThunk
|
|
){
|
|
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;
|
|
}
|