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KimLS
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/* md5.c -- An implementation of Ron Rivest's MD5 message-digest algorithm.
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* Written by Colin Plumb in 1993, no copyright is claimed. This code is in the
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* public domain; do with it what you wish. Equivalent code is available from
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* RSA Data Security, Inc. This code does not oblige you to include legal
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* boilerplate in the documentation. To compute the message digest of a string
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* of bytes, declare an MD5Context structure, pass it to MD5Init, call
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* MD5Update as 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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#include <string.h> /* for memcpy() */
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#include "../common/md5.h"
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#include "../common/MiscFunctions.h"
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#include "../common/seperator.h"
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MD5::MD5() {
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memset(pMD5, 0, 16);
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}
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MD5::MD5(const uchar* buf, uint32 len) {
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Generate(buf, len, pMD5);
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}
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MD5::MD5(const char* buf, uint32 len) {
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Generate((const uchar*) buf, len, pMD5);
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}
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MD5::MD5(const uint8 buf[16]) {
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Set(buf);
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}
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MD5::MD5(const char* iMD5String) {
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Set(iMD5String);
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}
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void MD5::Generate(const char* iString) {
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Generate((const uchar*) iString, strlen(iString));
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}
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void MD5::Generate(const uint8* buf, uint32 len) {
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Generate(buf, len, pMD5);
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}
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bool MD5::Set(const uint8 buf[16]) {
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memcpy(pMD5, buf, 16);
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return true;
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}
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bool MD5::Set(const char* iMD5String) {
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char tmp[5] = { '0', 'x', 0, 0, 0 };
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for (int i=0; i<16; i++) {
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tmp[2] = iMD5String[i*2];
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tmp[3] = iMD5String[(i*2) + 1];
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if (!Seperator::IsHexNumber(tmp))
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return false;
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pMD5[i] = hextoi(tmp);
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}
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return true;
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}
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MD5::operator const char* () {
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snprintf(pMD5String, sizeof(pMD5String), "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", pMD5[0], pMD5[1], pMD5[2], pMD5[3], pMD5[4], pMD5[5], pMD5[6], pMD5[7], pMD5[8], pMD5[9], pMD5[10], pMD5[11], pMD5[12], pMD5[13], pMD5[14], pMD5[15]);
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return pMD5String;
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}
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bool MD5::operator== (const MD5& iMD5) {
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if (memcmp(pMD5, iMD5.pMD5, 16) == 0)
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return true;
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else
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return false;
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}
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bool MD5::operator== (const uint8* iMD5) {
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if (memcmp(pMD5, iMD5, 16) == 0)
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return true;
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else
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return false;
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}
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bool MD5::operator== (const char* iMD5String) {
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char tmp[5] = { '0', 'x', 0, 0, 0 };
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for (int i=0; i<16; i++) {
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tmp[2] = iMD5String[i*2];
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tmp[3] = iMD5String[(i*2) + 1];
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if (pMD5[i] != hextoi(tmp))
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return false;
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}
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return true;
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}
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MD5& MD5::operator= (const MD5& iMD5) {
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memcpy(pMD5, iMD5.pMD5, 16);
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return *this;
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}
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MD5* MD5::operator= (const MD5* iMD5) {
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memcpy(pMD5, iMD5->pMD5, 16);
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return this;
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}
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/* Byte-swap an array of words to little-endian. (Byte-sex independent) */
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void MD5::byteSwap(uint32 *buf, uint32 words) {
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uint8 *p = (uint8 *)buf;
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do {
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*buf++ = (uint32)((uint32)p[3]<<8 | p[2]) << 16 |
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((uint32)p[1]<<8 | p[0]);
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p += 4;
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} while (--words);
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}
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void MD5::Generate(const uint8* buf, uint32 len, uint8 digest[16]) {
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MD5Context ctx;
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Init(&ctx);
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Update(&ctx, buf, len);
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Final(digest, &ctx);
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}
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/* Start MD5 accumulation. */
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void MD5::Init(struct MD5Context *ctx) {
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ctx->hash[0] = 0x67452301;
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ctx->hash[1] = 0xefcdab89;
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ctx->hash[2] = 0x98badcfe;
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ctx->hash[3] = 0x10325476;
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ctx->bytes[1] = ctx->bytes[0] = 0;
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}
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/* Update ctx to reflect the addition of another buffer full of bytes. */
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void MD5::Update(struct MD5Context *ctx, uint8 const *buf, uint32 len) {
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uint32 t = ctx->bytes[0];
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if ((ctx->bytes[0] = t + len) < t) /* Update 64-bit byte count */
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ctx->bytes[1]++; /* Carry from low to high */
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t = 64 - (t & 0x3f); /* Bytes available in ctx->input (>= 1) */
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if (t > len) {
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memcpy((uint8*)ctx->input+64-t, buf, len);
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return;
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}
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/* First chunk is an odd size */
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memcpy((uint8*)ctx->input+64-t, buf, t);
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byteSwap(ctx->input, 16);
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Transform(ctx->hash, ctx->input);
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buf += t;
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len -= t;
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/* Process data in 64-byte chunks */
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while (len >= 64) {
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memcpy(ctx->input, buf, 64);
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byteSwap(ctx->input, 16);
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Transform(ctx->hash, ctx->input);
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buf += 64;
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len -= 64;
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}
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/* Buffer any remaining bytes of data */
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memcpy(ctx->input, buf, len);
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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, LSB-first) */
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void MD5::Final(uint8 digest[16], MD5Context *ctx) {
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int count = ctx->bytes[0] & 0x3F; /* Bytes mod 64 */
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uint8 *p = (uint8*)ctx->input + count;
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/* Set the first byte of padding to 0x80. There is always room. */
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*p++ = 0x80;
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/* Bytes of zero padding needed to make 56 bytes (-8..55) */
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count = 56 - 1 - count;
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if (count < 0) { /* Padding forces an extra block */
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memset(p, 0, count+8);
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byteSwap(ctx->input, 16);
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Transform(ctx->hash, ctx->input);
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p = (uint8*)ctx->input;
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count = 56;
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}
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memset(p, 0, count);
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byteSwap(ctx->input, 14);
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/* Append 8 bytes of length in *bits* and transform */
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ctx->input[14] = ctx->bytes[0] << 3;
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ctx->input[15] = ctx->bytes[1] << 3 | ctx->bytes[0] >> 29;
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Transform(ctx->hash, ctx->input);
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byteSwap(ctx->hash, 4);
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memcpy(digest, ctx->hash, 16);
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memset(ctx, 0, sizeof(*ctx)); /* In case it's sensitive */
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}
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/* The four core functions */
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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,in,s) (w += f(x,y,z)+in, w = (w<<s | w>>(32-s)) + x)
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/* The heart of the MD5 algorithm. */
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void MD5::Transform(uint32 hash[4], const uint32 input[16]) {
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register uint32 a = hash[0], b = hash[1], c = hash[2], d = hash[3];
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MD5STEP(F1, a, b, c, d, input[ 0]+0xd76aa478, 7);
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MD5STEP(F1, d, a, b, c, input[ 1]+0xe8c7b756, 12);
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MD5STEP(F1, c, d, a, b, input[ 2]+0x242070db, 17);
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MD5STEP(F1, b, c, d, a, input[ 3]+0xc1bdceee, 22);
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MD5STEP(F1, a, b, c, d, input[ 4]+0xf57c0faf, 7);
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MD5STEP(F1, d, a, b, c, input[ 5]+0x4787c62a, 12);
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MD5STEP(F1, c, d, a, b, input[ 6]+0xa8304613, 17);
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MD5STEP(F1, b, c, d, a, input[ 7]+0xfd469501, 22);
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MD5STEP(F1, a, b, c, d, input[ 8]+0x698098d8, 7);
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MD5STEP(F1, d, a, b, c, input[ 9]+0x8b44f7af, 12);
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MD5STEP(F1, c, d, a, b, input[10]+0xffff5bb1, 17);
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MD5STEP(F1, b, c, d, a, input[11]+0x895cd7be, 22);
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MD5STEP(F1, a, b, c, d, input[12]+0x6b901122, 7);
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MD5STEP(F1, d, a, b, c, input[13]+0xfd987193, 12);
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MD5STEP(F1, c, d, a, b, input[14]+0xa679438e, 17);
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MD5STEP(F1, b, c, d, a, input[15]+0x49b40821, 22);
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MD5STEP(F2, a, b, c, d, input[ 1]+0xf61e2562, 5);
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MD5STEP(F2, d, a, b, c, input[ 6]+0xc040b340, 9);
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MD5STEP(F2, c, d, a, b, input[11]+0x265e5a51, 14);
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MD5STEP(F2, b, c, d, a, input[ 0]+0xe9b6c7aa, 20);
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MD5STEP(F2, a, b, c, d, input[ 5]+0xd62f105d, 5);
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MD5STEP(F2, d, a, b, c, input[10]+0x02441453, 9);
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MD5STEP(F2, c, d, a, b, input[15]+0xd8a1e681, 14);
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MD5STEP(F2, b, c, d, a, input[ 4]+0xe7d3fbc8, 20);
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MD5STEP(F2, a, b, c, d, input[ 9]+0x21e1cde6, 5);
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MD5STEP(F2, d, a, b, c, input[14]+0xc33707d6, 9);
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MD5STEP(F2, c, d, a, b, input[ 3]+0xf4d50d87, 14);
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MD5STEP(F2, b, c, d, a, input[ 8]+0x455a14ed, 20);
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MD5STEP(F2, a, b, c, d, input[13]+0xa9e3e905, 5);
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MD5STEP(F2, d, a, b, c, input[ 2]+0xfcefa3f8, 9);
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MD5STEP(F2, c, d, a, b, input[ 7]+0x676f02d9, 14);
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MD5STEP(F2, b, c, d, a, input[12]+0x8d2a4c8a, 20);
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MD5STEP(F3, a, b, c, d, input[ 5]+0xfffa3942, 4);
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MD5STEP(F3, d, a, b, c, input[ 8]+0x8771f681, 11);
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MD5STEP(F3, c, d, a, b, input[11]+0x6d9d6122, 16);
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MD5STEP(F3, b, c, d, a, input[14]+0xfde5380c, 23);
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MD5STEP(F3, a, b, c, d, input[ 1]+0xa4beea44, 4);
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MD5STEP(F3, d, a, b, c, input[ 4]+0x4bdecfa9, 11);
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MD5STEP(F3, c, d, a, b, input[ 7]+0xf6bb4b60, 16);
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MD5STEP(F3, b, c, d, a, input[10]+0xbebfbc70, 23);
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MD5STEP(F3, a, b, c, d, input[13]+0x289b7ec6, 4);
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MD5STEP(F3, d, a, b, c, input[ 0]+0xeaa127fa, 11);
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MD5STEP(F3, c, d, a, b, input[ 3]+0xd4ef3085, 16);
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MD5STEP(F3, b, c, d, a, input[ 6]+0x04881d05, 23);
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MD5STEP(F3, a, b, c, d, input[ 9]+0xd9d4d039, 4);
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MD5STEP(F3, d, a, b, c, input[12]+0xe6db99e5, 11);
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MD5STEP(F3, c, d, a, b, input[15]+0x1fa27cf8, 16);
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MD5STEP(F3, b, c, d, a, input[ 2]+0xc4ac5665, 23);
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MD5STEP(F4, a, b, c, d, input[ 0]+0xf4292244, 6);
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MD5STEP(F4, d, a, b, c, input[ 7]+0x432aff97, 10);
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MD5STEP(F4, c, d, a, b, input[14]+0xab9423a7, 15);
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MD5STEP(F4, b, c, d, a, input[ 5]+0xfc93a039, 21);
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MD5STEP(F4, a, b, c, d, input[12]+0x655b59c3, 6);
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MD5STEP(F4, d, a, b, c, input[ 3]+0x8f0ccc92, 10);
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MD5STEP(F4, c, d, a, b, input[10]+0xffeff47d, 15);
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MD5STEP(F4, b, c, d, a, input[ 1]+0x85845dd1, 21);
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MD5STEP(F4, a, b, c, d, input[ 8]+0x6fa87e4f, 6);
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MD5STEP(F4, d, a, b, c, input[15]+0xfe2ce6e0, 10);
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MD5STEP(F4, c, d, a, b, input[ 6]+0xa3014314, 15);
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MD5STEP(F4, b, c, d, a, input[13]+0x4e0811a1, 21);
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MD5STEP(F4, a, b, c, d, input[ 4]+0xf7537e82, 6);
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MD5STEP(F4, d, a, b, c, input[11]+0xbd3af235, 10);
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MD5STEP(F4, c, d, a, b, input[ 2]+0x2ad7d2bb, 15);
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MD5STEP(F4, b, c, d, a, input[ 9]+0xeb86d391, 21);
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hash[0] += a; hash[1] += b; hash[2] += c; hash[3] += d;
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}
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