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Diffstat (limited to 'libbb/md5prime.c')
| -rw-r--r-- | libbb/md5prime.c | 460 |
1 files changed, 460 insertions, 0 deletions
diff --git a/libbb/md5prime.c b/libbb/md5prime.c new file mode 100644 index 0000000..7986f4d --- /dev/null +++ b/libbb/md5prime.c @@ -0,0 +1,460 @@ +/* This file is not used by busybox right now. + * However, the code here seems to be a tiny bit smaller + * than one in md5.c. Need to investigate which one + * is better overall... + * Hint: grep for md5prime to find places where you can switch + * md5.c/md5prime.c + */ + +/* + * MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm + * + * Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All + * rights reserved. + * + * License to copy and use this software is granted provided that it + * is identified as the "RSA Data Security, Inc. MD5 Message-Digest + * Algorithm" in all material mentioning or referencing this software + * or this function. + * + * License is also granted to make and use derivative works provided + * that such works are identified as "derived from the RSA Data + * Security, Inc. MD5 Message-Digest Algorithm" in all material + * mentioning or referencing the derived work. + * + * RSA Data Security, Inc. makes no representations concerning either + * the merchantability of this software or the suitability of this + * software for any particular purpose. It is provided "as is" + * without express or implied warranty of any kind. + * + * These notices must be retained in any copies of any part of this + * documentation and/or software. + * + * $FreeBSD: src/lib/libmd/md5c.c,v 1.9.2.1 1999/08/29 14:57:12 peter Exp $ + * + * This code is the same as the code published by RSA Inc. It has been + * edited for clarity and style only. + * + * ---------------------------------------------------------------------------- + * The md5_crypt() function was taken from freeBSD's libcrypt and contains + * this license: + * "THE BEER-WARE LICENSE" (Revision 42): + * <phk@login.dknet.dk> wrote this file. As long as you retain this notice you + * can do whatever you want with this stuff. If we meet some day, and you think + * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp + * + * $FreeBSD: src/lib/libcrypt/crypt.c,v 1.7.2.1 1999/08/29 14:56:33 peter Exp $ + * + * ---------------------------------------------------------------------------- + * On April 19th, 2001 md5_crypt() was modified to make it reentrant + * by Erik Andersen <andersen@uclibc.org> + * + * June 28, 2001 Manuel Novoa III + * + * "Un-inlined" code using loops and static const tables in order to + * reduce generated code size (on i386 from approx 4k to approx 2.5k). + * + * June 29, 2001 Manuel Novoa III + * + * Completely removed static PADDING array. + * + * Reintroduced the loop unrolling in md5_transform and added the + * MD5_SIZE_VS_SPEED option for configurability. Define below as: + * 0 fully unrolled loops + * 1 partially unrolled (4 ops per loop) + * 2 no unrolling -- introduces the need to swap 4 variables (slow) + * 3 no unrolling and all 4 loops merged into one with switch + * in each loop (glacial) + * On i386, sizes are roughly (-Os -fno-builtin): + * 0: 3k 1: 2.5k 2: 2.2k 3: 2k + * + * Since SuSv3 does not require crypt_r, modified again August 7, 2002 + * by Erik Andersen to remove reentrance stuff... + */ + +#include "libbb.h" + +/* 1: fastest, 3: smallest */ +#if CONFIG_MD5_SIZE_VS_SPEED < 1 +# define MD5_SIZE_VS_SPEED 1 +#elif CONFIG_MD5_SIZE_VS_SPEED > 3 +# define MD5_SIZE_VS_SPEED 3 +#else +# define MD5_SIZE_VS_SPEED CONFIG_MD5_SIZE_VS_SPEED +#endif + +#if BB_LITTLE_ENDIAN +#define memcpy32_cpu2le memcpy +#define memcpy32_le2cpu memcpy +#else +/* Encodes input (uint32_t) into output (unsigned char). + * Assumes len is a multiple of 4. */ +static void +memcpy32_cpu2le(unsigned char *output, uint32_t *input, unsigned len) +{ + unsigned i, j; + for (i = 0, j = 0; j < len; i++, j += 4) { + output[j] = input[i]; + output[j+1] = (input[i] >> 8); + output[j+2] = (input[i] >> 16); + output[j+3] = (input[i] >> 24); + } +} +/* Decodes input (unsigned char) into output (uint32_t). + * Assumes len is a multiple of 4. */ +static void +memcpy32_le2cpu(uint32_t *output, const unsigned char *input, unsigned len) +{ + unsigned i, j; + for (i = 0, j = 0; j < len; i++, j += 4) + output[i] = ((uint32_t)input[j]) + | (((uint32_t)input[j+1]) << 8) + | (((uint32_t)input[j+2]) << 16) + | (((uint32_t)input[j+3]) << 24); +} +#endif /* i386 */ + +/* F, G, H and I are basic MD5 functions. */ +#define F(x, y, z) (((x) & (y)) | (~(x) & (z))) +#define G(x, y, z) (((x) & (z)) | ((y) & ~(z))) +#define H(x, y, z) ((x) ^ (y) ^ (z)) +#define I(x, y, z) ((y) ^ ((x) | ~(z))) + +/* rotl32 rotates x left n bits. */ +#define rotl32(x, n) (((x) << (n)) | ((x) >> (32 - (n)))) + +/* + * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. + * Rotation is separate from addition to prevent recomputation. + */ +#define FF(a, b, c, d, x, s, ac) { \ + (a) += F((b), (c), (d)) + (x) + (uint32_t)(ac); \ + (a) = rotl32((a), (s)); \ + (a) += (b); \ + } +#define GG(a, b, c, d, x, s, ac) { \ + (a) += G((b), (c), (d)) + (x) + (uint32_t)(ac); \ + (a) = rotl32((a), (s)); \ + (a) += (b); \ + } +#define HH(a, b, c, d, x, s, ac) { \ + (a) += H((b), (c), (d)) + (x) + (uint32_t)(ac); \ + (a) = rotl32((a), (s)); \ + (a) += (b); \ + } +#define II(a, b, c, d, x, s, ac) { \ + (a) += I((b), (c), (d)) + (x) + (uint32_t)(ac); \ + (a) = rotl32((a), (s)); \ + (a) += (b); \ + } + +/* MD5 basic transformation. Transforms state based on block. */ +static void md5_transform(uint32_t state[4], const unsigned char block[64]) +{ + uint32_t a, b, c, d, x[16]; +#if MD5_SIZE_VS_SPEED > 1 + uint32_t temp; + const unsigned char *ps; + + static const unsigned char S[] = { + 7, 12, 17, 22, + 5, 9, 14, 20, + 4, 11, 16, 23, + 6, 10, 15, 21 + }; +#endif /* MD5_SIZE_VS_SPEED > 1 */ + +#if MD5_SIZE_VS_SPEED > 0 + const uint32_t *pc; + const unsigned char *pp; + int i; + + static const uint32_t C[] = { + /* round 1 */ + 0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, + 0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501, + 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be, + 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821, + /* round 2 */ + 0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa, + 0xd62f105d, 0x2441453, 0xd8a1e681, 0xe7d3fbc8, + 0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, + 0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a, + /* round 3 */ + 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c, + 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70, + 0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x4881d05, + 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665, + /* round 4 */ + 0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, + 0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1, + 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1, + 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391 + }; + static const unsigned char P[] = { + 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, /* 1 */ + 1, 6, 11, 0, 5, 10, 15, 4, 9, 14, 3, 8, 13, 2, 7, 12, /* 2 */ + 5, 8, 11, 14, 1, 4, 7, 10, 13, 0, 3, 6, 9, 12, 15, 2, /* 3 */ + 0, 7, 14, 5, 12, 3, 10, 1, 8, 15, 6, 13, 4, 11, 2, 9 /* 4 */ + }; + +#endif /* MD5_SIZE_VS_SPEED > 0 */ + + memcpy32_le2cpu(x, block, 64); + + a = state[0]; + b = state[1]; + c = state[2]; + d = state[3]; + +#if MD5_SIZE_VS_SPEED > 2 + pc = C; + pp = P; + ps = S - 4; + for (i = 0; i < 64; i++) { + if ((i & 0x0f) == 0) ps += 4; + temp = a; + switch (i>>4) { + case 0: + temp += F(b, c, d); + break; + case 1: + temp += G(b, c, d); + break; + case 2: + temp += H(b, c, d); + break; + case 3: + temp += I(b, c, d); + break; + } + temp += x[*pp++] + *pc++; + temp = rotl32(temp, ps[i & 3]); + temp += b; + a = d; d = c; c = b; b = temp; + } +#elif MD5_SIZE_VS_SPEED > 1 + pc = C; + pp = P; + ps = S; + /* Round 1 */ + for (i = 0; i < 16; i++) { + FF(a, b, c, d, x[*pp], ps[i & 0x3], *pc); pp++; pc++; + temp = d; d = c; c = b; b = a; a = temp; + } + /* Round 2 */ + ps += 4; + for (; i < 32; i++) { + GG(a, b, c, d, x[*pp], ps[i & 0x3], *pc); pp++; pc++; + temp = d; d = c; c = b; b = a; a = temp; + } + /* Round 3 */ + ps += 4; + for (; i < 48; i++) { + HH(a, b, c, d, x[*pp], ps[i & 0x3], *pc); pp++; pc++; + temp = d; d = c; c = b; b = a; a = temp; + } + /* Round 4 */ + ps += 4; + for (; i < 64; i++) { + II(a, b, c, d, x[*pp], ps[i & 0x3], *pc); pp++; pc++; + temp = d; d = c; c = b; b = a; a = temp; + } +#elif MD5_SIZE_VS_SPEED > 0 + pc = C; + pp = P; + /* Round 1 */ + for (i = 0; i < 4; i++) { + FF(a, b, c, d, x[*pp], 7, *pc); pp++; pc++; + FF(d, a, b, c, x[*pp], 12, *pc); pp++; pc++; + FF(c, d, a, b, x[*pp], 17, *pc); pp++; pc++; + FF(b, c, d, a, x[*pp], 22, *pc); pp++; pc++; + } + /* Round 2 */ + for (i = 0; i < 4; i++) { + GG(a, b, c, d, x[*pp], 5, *pc); pp++; pc++; + GG(d, a, b, c, x[*pp], 9, *pc); pp++; pc++; + GG(c, d, a, b, x[*pp], 14, *pc); pp++; pc++; + GG(b, c, d, a, x[*pp], 20, *pc); pp++; pc++; + } + /* Round 3 */ + for (i = 0; i < 4; i++) { + HH(a, b, c, d, x[*pp], 4, *pc); pp++; pc++; + HH(d, a, b, c, x[*pp], 11, *pc); pp++; pc++; + HH(c, d, a, b, x[*pp], 16, *pc); pp++; pc++; + HH(b, c, d, a, x[*pp], 23, *pc); pp++; pc++; + } + /* Round 4 */ + for (i = 0; i < 4; i++) { + II(a, b, c, d, x[*pp], 6, *pc); pp++; pc++; + II(d, a, b, c, x[*pp], 10, *pc); pp++; pc++; + II(c, d, a, b, x[*pp], 15, *pc); pp++; pc++; + II(b, c, d, a, x[*pp], 21, *pc); pp++; pc++; + } +#else + /* Round 1 */ +#define S11 7 +#define S12 12 +#define S13 17 +#define S14 22 + FF(a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */ + FF(d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */ + FF(c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */ + FF(b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */ + FF(a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */ + FF(d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */ + FF(c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */ + FF(b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */ + FF(a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */ + FF(d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */ + FF(c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */ + FF(b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */ + FF(a, b, c, d, x[12], S11, 0x6b901122); /* 13 */ + FF(d, a, b, c, x[13], S12, 0xfd987193); /* 14 */ + FF(c, d, a, b, x[14], S13, 0xa679438e); /* 15 */ + FF(b, c, d, a, x[15], S14, 0x49b40821); /* 16 */ + /* Round 2 */ +#define S21 5 +#define S22 9 +#define S23 14 +#define S24 20 + GG(a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */ + GG(d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */ + GG(c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */ + GG(b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */ + GG(a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */ + GG(d, a, b, c, x[10], S22, 0x2441453); /* 22 */ + GG(c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */ + GG(b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */ + GG(a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */ + GG(d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */ + GG(c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */ + GG(b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */ + GG(a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */ + GG(d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */ + GG(c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */ + GG(b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */ + /* Round 3 */ +#define S31 4 +#define S32 11 +#define S33 16 +#define S34 23 + HH(a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */ + HH(d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */ + HH(c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */ + HH(b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */ + HH(a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */ + HH(d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */ + HH(c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */ + HH(b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */ + HH(a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */ + HH(d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */ + HH(c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */ + HH(b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */ + HH(a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */ + HH(d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */ + HH(c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */ + HH(b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */ + /* Round 4 */ +#define S41 6 +#define S42 10 +#define S43 15 +#define S44 21 + II(a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */ + II(d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */ + II(c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */ + II(b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */ + II(a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */ + II(d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */ + II(c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */ + II(b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */ + II(a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */ + II(d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */ + II(c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */ + II(b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */ + II(a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */ + II(d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */ + II(c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */ + II(b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */ +#endif + + state[0] += a; + state[1] += b; + state[2] += c; + state[3] += d; + + /* Zeroize sensitive information. */ + memset(x, 0, sizeof(x)); +} + + +/* MD5 initialization. */ +void FAST_FUNC md5_begin(md5_ctx_t *context) +{ + context->count[0] = context->count[1] = 0; + /* Load magic initialization constants. */ + context->state[0] = 0x67452301; + context->state[1] = 0xefcdab89; + context->state[2] = 0x98badcfe; + context->state[3] = 0x10325476; +} + +/* + * MD5 block update operation. Continues an MD5 message-digest + * operation, processing another message block, and updating + * the context. + */ +void FAST_FUNC md5_hash(const void *buffer, size_t inputLen, md5_ctx_t *context) +{ + unsigned i, idx, partLen; + const unsigned char *input = buffer; + + /* Compute number of bytes mod 64 */ + idx = (context->count[0] >> 3) & 0x3F; + + /* Update number of bits */ + context->count[0] += (inputLen << 3); + if (context->count[0] < (inputLen << 3)) + context->count[1]++; + context->count[1] += (inputLen >> 29); + + /* Transform as many times as possible. */ + i = 0; + partLen = 64 - idx; + if (inputLen >= partLen) { + memcpy(&context->buffer[idx], input, partLen); + md5_transform(context->state, context->buffer); + for (i = partLen; i + 63 < inputLen; i += 64) + md5_transform(context->state, &input[i]); + idx = 0; + } + + /* Buffer remaining input */ + memcpy(&context->buffer[idx], &input[i], inputLen - i); +} + +/* + * MD5 finalization. Ends an MD5 message-digest operation, + * writing the message digest. + */ +void FAST_FUNC md5_end(void *digest, md5_ctx_t *context) +{ + unsigned idx, padLen; + unsigned char bits[8]; + unsigned char padding[64]; + + /* Add padding followed by original length. */ + memset(padding, 0, sizeof(padding)); + padding[0] = 0x80; + /* save number of bits */ + memcpy32_cpu2le(bits, context->count, 8); + /* pad out to 56 mod 64 */ + idx = (context->count[0] >> 3) & 0x3f; + padLen = (idx < 56) ? (56 - idx) : (120 - idx); + md5_hash(padding, padLen, context); + /* append length (before padding) */ + md5_hash(bits, 8, context); + + /* Store state in digest */ + memcpy32_cpu2le(digest, context->state, 16); +} |