225 lines
6.5 KiB
C
Executable File
225 lines
6.5 KiB
C
Executable File
// based on public-domain code from Colin Plumb (1993)
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#include <string.h>
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#include "md5.h"
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static unsigned getu32(const unsigned char *addr)
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{
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return (((((unsigned long)addr[3] << 8) | addr[2]) << 8) | addr[1]) << 8 | addr[0];
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}
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static void putu32(unsigned data, unsigned char *addr)
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{
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addr[0] = (unsigned char)data;
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addr[1] = (unsigned char)(data >> 8);
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addr[2] = (unsigned char)(data >> 16);
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addr[3] = (unsigned char)(data >> 24);
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}
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void md5_init(struct md5_context *ctx)
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{
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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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void md5_update(struct md5_context *ctx, unsigned char const *buf, unsigned len)
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{
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unsigned t;
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// update bit count
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t = ctx->bits[0];
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if((ctx->bits[0] = (t + ((unsigned)len << 3)) & 0xffffffff) < t)
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ctx->bits[1]++; // carry
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ctx->bits[1] += len >> 29;
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t = (t >> 3) & 0x3f;
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// use leading data to top up the buffer
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if(t) {
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unsigned char *p = 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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md5_transform(ctx->buf, ctx->in);
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buf += t;
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len -= t;
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}
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// following 64-byte chunks
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while(len >= 64) {
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memcpy(ctx->in, buf, 64);
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md5_transform(ctx->buf, ctx->in);
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buf += 64;
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len -= 64;
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}
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// save rest of bytes for later
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memcpy(ctx->in, buf, len);
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}
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void md5_final(unsigned char digest[16], struct md5_context *ctx)
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{
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unsigned count;
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unsigned char *p;
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// #bytes mod64
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count = (ctx->bits[0] >> 3) & 0x3F;
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// first char of padding = 0x80
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p = ctx->in + count;
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*p++ = 0x80;
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// calculate # of bytes to pad
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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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// we need to finish a whole block before padding
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memset(p, 0, count);
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md5_transform(ctx->buf, ctx->in);
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memset(ctx->in, 0, 56);
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} else {
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// just pad to 56 bytes
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memset(p, 0, count-8);
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}
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// append length & final transform
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putu32(ctx->bits[0], ctx->in + 56);
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putu32(ctx->bits[1], ctx->in + 60);
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md5_transform(ctx->buf, ctx->in);
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putu32(ctx->buf[0], digest);
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putu32(ctx->buf[1], digest + 4);
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putu32(ctx->buf[2], digest + 8);
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putu32(ctx->buf[3], digest + 12);
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memset(ctx, 0, sizeof(ctx));
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}
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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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#define MD5STEP(f, w, x, y, z, data, s) \
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( w += f(x, y, z) + data, w &= 0xffffffff, w = w<<s | w>>(32-s), w += x )
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void md5_transform(unsigned buf[4], const unsigned char inraw[64])
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{
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unsigned a, b, c, d;
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unsigned in[16];
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int i;
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for (i = 0; i < 16; ++i)
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in[i] = getu32 (inraw + 4 * i);
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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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static char hex[] = "0123456789abcdef";
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void md5_ascii(char *result, unsigned char const *buf, unsigned len)
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{
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struct md5_context md5;
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unsigned char hash[16];
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int i;
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if(len==0)
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len = strlen((char *)buf);
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md5_init(&md5);
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md5_update(&md5, buf, len);
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md5_final(hash, &md5);
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for(i=0;i<16;i++) {
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result[i*2] = hex[(hash[i]>>4)&0xF];
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result[i*2+1] = hex[hash[i]&0x0F];
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}
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result[32] = 0;
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}
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