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Diffstat (limited to '')
| -rw-r--r-- | lib/compat/md5.c | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/lib/compat/md5.c b/lib/compat/md5.c new file mode 100644 index 0000000..7da9746 --- /dev/null +++ b/lib/compat/md5.c @@ -0,0 +1,252 @@ +/* $OpenBSD: md5.c,v 1.7 2004/05/28 15:10:27 millert 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 <config.h> +#include <compat.h> + +#include <sys/types.h> +#include <string.h> + +#include "md5.h" + +#define PUT_64BIT_LE(cp, value) do { \ + (cp)[7] = (value) >> 56; \ + (cp)[6] = (value) >> 48; \ + (cp)[5] = (value) >> 40; \ + (cp)[4] = (value) >> 32; \ + (cp)[3] = (value) >> 24; \ + (cp)[2] = (value) >> 16; \ + (cp)[1] = (value) >> 8; \ + (cp)[0] = (value); } while (0) + +#define PUT_32BIT_LE(cp, value) do { \ + (cp)[3] = (value) >> 24; \ + (cp)[2] = (value) >> 16; \ + (cp)[1] = (value) >> 8; \ + (cp)[0] = (value); } while (0) + +static uint8_t PADDING[MD5_BLOCK_LENGTH] = { + 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 +}; + +/* + * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious + * initialization constants. + */ +void +MD5Init(MD5_CTX *ctx) +{ + ctx->count = 0; + ctx->state[0] = 0x67452301; + ctx->state[1] = 0xefcdab89; + ctx->state[2] = 0x98badcfe; + ctx->state[3] = 0x10325476; +} + +/* + * Update context to reflect the concatenation of another buffer full + * of bytes. + */ +void +MD5Update(MD5_CTX *ctx, const unsigned char *input, size_t len) +{ + size_t have, need; + + /* Check how many bytes we already have and how many more we need. */ + have = (size_t)((ctx->count >> 3) & (MD5_BLOCK_LENGTH - 1)); + need = MD5_BLOCK_LENGTH - have; + + /* Update bitcount */ + ctx->count += (uint64_t)len << 3; + + if (len >= need) { + if (have != 0) { + memcpy(ctx->buffer + have, input, need); + MD5Transform(ctx->state, ctx->buffer); + input += need; + len -= need; + have = 0; + } + + /* Process data in MD5_BLOCK_LENGTH-byte chunks. */ + while (len >= MD5_BLOCK_LENGTH) { + MD5Transform(ctx->state, input); + input += MD5_BLOCK_LENGTH; + len -= MD5_BLOCK_LENGTH; + } + } + + /* Handle any remaining bytes of data. */ + if (len != 0) + memcpy(ctx->buffer + have, input, len); +} + +/* + * Pad pad to 64-byte boundary with the bit pattern + * 1 0* (64-bit count of bits processed, MSB-first) + */ +void +MD5Pad(MD5_CTX *ctx) +{ + uint8_t count[8]; + size_t padlen; + + /* Convert count to 8 bytes in little endian order. */ + PUT_64BIT_LE(count, ctx->count); + + /* Pad out to 56 mod 64. */ + padlen = MD5_BLOCK_LENGTH - + ((ctx->count >> 3) & (MD5_BLOCK_LENGTH - 1)); + if (padlen < 1 + 8) + padlen += MD5_BLOCK_LENGTH; + MD5Update(ctx, PADDING, padlen - 8); /* padlen - 8 <= 64 */ + MD5Update(ctx, count, 8); +} + +/* + * Final wrapup--call MD5Pad, fill in digest and zero out ctx. + */ +void +MD5Final(unsigned char digest[MD5_DIGEST_LENGTH], MD5_CTX *ctx) +{ + int i; + + MD5Pad(ctx); + if (digest != NULL) { + for (i = 0; i < 4; i++) + PUT_32BIT_LE(digest + i * 4, ctx->state[i]); + memset(ctx, 0, sizeof(*ctx)); + } +} + + +/* 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. + */ +void +MD5Transform(uint32_t state[4], const uint8_t block[MD5_BLOCK_LENGTH]) +{ + uint32_t a, b, c, d, in[MD5_BLOCK_LENGTH / 4]; + +#ifndef WORDS_BIGENDIAN + memcpy(in, block, sizeof(in)); +#else + for (a = 0; a < MD5_BLOCK_LENGTH / 4; a++) { + in[a] = (uint32_t)( + (uint32_t)(block[a * 4 + 0]) | + (uint32_t)(block[a * 4 + 1]) << 8 | + (uint32_t)(block[a * 4 + 2]) << 16 | + (uint32_t)(block[a * 4 + 3]) << 24); + } +#endif + + a = state[0]; + b = state[1]; + c = state[2]; + d = state[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); + + state[0] += a; + state[1] += b; + state[2] += c; + state[3] += d; +} |