From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- libiberty/md5.c | 431 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 431 insertions(+) create mode 100644 libiberty/md5.c (limited to 'libiberty/md5.c') diff --git a/libiberty/md5.c b/libiberty/md5.c new file mode 100644 index 000000000..9de9d88c2 --- /dev/null +++ b/libiberty/md5.c @@ -0,0 +1,431 @@ +/* md5.c - Functions to compute MD5 message digest of files or memory blocks + according to the definition of MD5 in RFC 1321 from April 1992. + Copyright (C) 1995, 1996 Free Software Foundation, Inc. + + NOTE: This source is derived from an old version taken from the GNU C + Library (glibc). + + This program is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by the + Free Software Foundation; either version 2, or (at your option) any + later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software Foundation, + Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ + +/* Written by Ulrich Drepper , 1995. */ + +#ifdef HAVE_CONFIG_H +# include +#endif + +#include + +#if STDC_HEADERS || defined _LIBC +# include +# include +#else +# ifndef HAVE_MEMCPY +# define memcpy(d, s, n) bcopy ((s), (d), (n)) +# endif +#endif + +#include "ansidecl.h" +#include "md5.h" + +#ifdef _LIBC +# include +# if __BYTE_ORDER == __BIG_ENDIAN +# define WORDS_BIGENDIAN 1 +# endif +#endif + +#ifdef WORDS_BIGENDIAN +# define SWAP(n) \ + (((n) << 24) | (((n) & 0xff00) << 8) | (((n) >> 8) & 0xff00) | ((n) >> 24)) +#else +# define SWAP(n) (n) +#endif + + +/* This array contains the bytes used to pad the buffer to the next + 64-byte boundary. (RFC 1321, 3.1: Step 1) */ +static const unsigned char fillbuf[64] = { 0x80, 0 /* , 0, 0, ... */ }; + + +/* Initialize structure containing state of computation. + (RFC 1321, 3.3: Step 3) */ +void +md5_init_ctx (struct md5_ctx *ctx) +{ + ctx->A = (md5_uint32) 0x67452301; + ctx->B = (md5_uint32) 0xefcdab89; + ctx->C = (md5_uint32) 0x98badcfe; + ctx->D = (md5_uint32) 0x10325476; + + ctx->total[0] = ctx->total[1] = 0; + ctx->buflen = 0; +} + +/* Put result from CTX in first 16 bytes following RESBUF. The result + must be in little endian byte order. + + IMPORTANT: On some systems it is required that RESBUF is correctly + aligned for a 32 bits value. */ +void * +md5_read_ctx (const struct md5_ctx *ctx, void *resbuf) +{ + ((md5_uint32 *) resbuf)[0] = SWAP (ctx->A); + ((md5_uint32 *) resbuf)[1] = SWAP (ctx->B); + ((md5_uint32 *) resbuf)[2] = SWAP (ctx->C); + ((md5_uint32 *) resbuf)[3] = SWAP (ctx->D); + + return resbuf; +} + +/* Process the remaining bytes in the internal buffer and the usual + prolog according to the standard and write the result to RESBUF. + + IMPORTANT: On some systems it is required that RESBUF is correctly + aligned for a 32 bits value. */ +void * +md5_finish_ctx (struct md5_ctx *ctx, void *resbuf) +{ + /* Take yet unprocessed bytes into account. */ + md5_uint32 bytes = ctx->buflen; + size_t pad; + + /* Now count remaining bytes. */ + ctx->total[0] += bytes; + if (ctx->total[0] < bytes) + ++ctx->total[1]; + + pad = bytes >= 56 ? 64 + 56 - bytes : 56 - bytes; + memcpy (&ctx->buffer[bytes], fillbuf, pad); + + /* Put the 64-bit file length in *bits* at the end of the buffer. */ + *(md5_uint32 *) &ctx->buffer[bytes + pad] = SWAP (ctx->total[0] << 3); + *(md5_uint32 *) &ctx->buffer[bytes + pad + 4] = SWAP ((ctx->total[1] << 3) | + (ctx->total[0] >> 29)); + + /* Process last bytes. */ + md5_process_block (ctx->buffer, bytes + pad + 8, ctx); + + return md5_read_ctx (ctx, resbuf); +} + +/* Compute MD5 message digest for bytes read from STREAM. The + resulting message digest number will be written into the 16 bytes + beginning at RESBLOCK. */ +int +md5_stream (FILE *stream, void *resblock) +{ + /* Important: BLOCKSIZE must be a multiple of 64. */ +#define BLOCKSIZE 4096 + struct md5_ctx ctx; + char buffer[BLOCKSIZE + 72]; + size_t sum; + + /* Initialize the computation context. */ + md5_init_ctx (&ctx); + + /* Iterate over full file contents. */ + while (1) + { + /* We read the file in blocks of BLOCKSIZE bytes. One call of the + computation function processes the whole buffer so that with the + next round of the loop another block can be read. */ + size_t n; + sum = 0; + + /* Read block. Take care for partial reads. */ + do + { + n = fread (buffer + sum, 1, BLOCKSIZE - sum, stream); + + sum += n; + } + while (sum < BLOCKSIZE && n != 0); + if (n == 0 && ferror (stream)) + return 1; + + /* If end of file is reached, end the loop. */ + if (n == 0) + break; + + /* Process buffer with BLOCKSIZE bytes. Note that + BLOCKSIZE % 64 == 0 + */ + md5_process_block (buffer, BLOCKSIZE, &ctx); + } + + /* Add the last bytes if necessary. */ + if (sum > 0) + md5_process_bytes (buffer, sum, &ctx); + + /* Construct result in desired memory. */ + md5_finish_ctx (&ctx, resblock); + return 0; +} + +/* Compute MD5 message digest for LEN bytes beginning at BUFFER. The + result is always in little endian byte order, so that a byte-wise + output yields to the wanted ASCII representation of the message + digest. */ +void * +md5_buffer (const char *buffer, size_t len, void *resblock) +{ + struct md5_ctx ctx; + + /* Initialize the computation context. */ + md5_init_ctx (&ctx); + + /* Process whole buffer but last len % 64 bytes. */ + md5_process_bytes (buffer, len, &ctx); + + /* Put result in desired memory area. */ + return md5_finish_ctx (&ctx, resblock); +} + + +void +md5_process_bytes (const void *buffer, size_t len, struct md5_ctx *ctx) +{ + /* When we already have some bits in our internal buffer concatenate + both inputs first. */ + if (ctx->buflen != 0) + { + size_t left_over = ctx->buflen; + size_t add = 128 - left_over > len ? len : 128 - left_over; + + memcpy (&ctx->buffer[left_over], buffer, add); + ctx->buflen += add; + + if (left_over + add > 64) + { + md5_process_block (ctx->buffer, (left_over + add) & ~63, ctx); + /* The regions in the following copy operation cannot overlap. */ + memcpy (ctx->buffer, &ctx->buffer[(left_over + add) & ~63], + (left_over + add) & 63); + ctx->buflen = (left_over + add) & 63; + } + + buffer = (const void *) ((const char *) buffer + add); + len -= add; + } + + /* Process available complete blocks. */ + if (len > 64) + { +#if !_STRING_ARCH_unaligned +/* To check alignment gcc has an appropriate operator. Other + compilers don't. */ +# if __GNUC__ >= 2 +# define UNALIGNED_P(p) (((md5_uintptr) p) % __alignof__ (md5_uint32) != 0) +# else +# define UNALIGNED_P(p) (((md5_uintptr) p) % sizeof (md5_uint32) != 0) +# endif + if (UNALIGNED_P (buffer)) + while (len > 64) + { + memcpy (ctx->buffer, buffer, 64); + md5_process_block (ctx->buffer, 64, ctx); + buffer = (const char *) buffer + 64; + len -= 64; + } + else +#endif + md5_process_block (buffer, len & ~63, ctx); + buffer = (const void *) ((const char *) buffer + (len & ~63)); + len &= 63; + } + + /* Move remaining bytes in internal buffer. */ + if (len > 0) + { + memcpy (ctx->buffer, buffer, len); + ctx->buflen = len; + } +} + + +/* These are the four functions used in the four steps of the MD5 algorithm + and defined in the RFC 1321. The first function is a little bit optimized + (as found in Colin Plumbs public domain implementation). */ +/* #define FF(b, c, d) ((b & c) | (~b & d)) */ +#define FF(b, c, d) (d ^ (b & (c ^ d))) +#define FG(b, c, d) FF (d, b, c) +#define FH(b, c, d) (b ^ c ^ d) +#define FI(b, c, d) (c ^ (b | ~d)) + +/* Process LEN bytes of BUFFER, accumulating context into CTX. + It is assumed that LEN % 64 == 0. */ + +void +md5_process_block (const void *buffer, size_t len, struct md5_ctx *ctx) +{ + md5_uint32 correct_words[16]; + const md5_uint32 *words = (const md5_uint32 *) buffer; + size_t nwords = len / sizeof (md5_uint32); + const md5_uint32 *endp = words + nwords; + md5_uint32 A = ctx->A; + md5_uint32 B = ctx->B; + md5_uint32 C = ctx->C; + md5_uint32 D = ctx->D; + + /* First increment the byte count. RFC 1321 specifies the possible + length of the file up to 2^64 bits. Here we only compute the + number of bytes. Do a double word increment. */ + ctx->total[0] += len; + if (ctx->total[0] < len) + ++ctx->total[1]; + + /* Process all bytes in the buffer with 64 bytes in each round of + the loop. */ + while (words < endp) + { + md5_uint32 *cwp = correct_words; + md5_uint32 A_save = A; + md5_uint32 B_save = B; + md5_uint32 C_save = C; + md5_uint32 D_save = D; + + /* First round: using the given function, the context and a constant + the next context is computed. Because the algorithms processing + unit is a 32-bit word and it is determined to work on words in + little endian byte order we perhaps have to change the byte order + before the computation. To reduce the work for the next steps + we store the swapped words in the array CORRECT_WORDS. */ + +#define OP(a, b, c, d, s, T) \ + do \ + { \ + a += FF (b, c, d) + (*cwp++ = SWAP (*words)) + T; \ + ++words; \ + CYCLIC (a, s); \ + a += b; \ + } \ + while (0) + + /* It is unfortunate that C does not provide an operator for + cyclic rotation. Hope the C compiler is smart enough. */ +#define CYCLIC(w, s) (w = (w << s) | (w >> (32 - s))) + + /* Before we start, one word to the strange constants. + They are defined in RFC 1321 as + + T[i] = (int) (4294967296.0 * fabs (sin (i))), i=1..64 + */ + + /* Round 1. */ + OP (A, B, C, D, 7, (md5_uint32) 0xd76aa478); + OP (D, A, B, C, 12, (md5_uint32) 0xe8c7b756); + OP (C, D, A, B, 17, (md5_uint32) 0x242070db); + OP (B, C, D, A, 22, (md5_uint32) 0xc1bdceee); + OP (A, B, C, D, 7, (md5_uint32) 0xf57c0faf); + OP (D, A, B, C, 12, (md5_uint32) 0x4787c62a); + OP (C, D, A, B, 17, (md5_uint32) 0xa8304613); + OP (B, C, D, A, 22, (md5_uint32) 0xfd469501); + OP (A, B, C, D, 7, (md5_uint32) 0x698098d8); + OP (D, A, B, C, 12, (md5_uint32) 0x8b44f7af); + OP (C, D, A, B, 17, (md5_uint32) 0xffff5bb1); + OP (B, C, D, A, 22, (md5_uint32) 0x895cd7be); + OP (A, B, C, D, 7, (md5_uint32) 0x6b901122); + OP (D, A, B, C, 12, (md5_uint32) 0xfd987193); + OP (C, D, A, B, 17, (md5_uint32) 0xa679438e); + OP (B, C, D, A, 22, (md5_uint32) 0x49b40821); + + /* For the second to fourth round we have the possibly swapped words + in CORRECT_WORDS. Redefine the macro to take an additional first + argument specifying the function to use. */ +#undef OP +#define OP(a, b, c, d, k, s, T) \ + do \ + { \ + a += FX (b, c, d) + correct_words[k] + T; \ + CYCLIC (a, s); \ + a += b; \ + } \ + while (0) + +#define FX(b, c, d) FG (b, c, d) + + /* Round 2. */ + OP (A, B, C, D, 1, 5, (md5_uint32) 0xf61e2562); + OP (D, A, B, C, 6, 9, (md5_uint32) 0xc040b340); + OP (C, D, A, B, 11, 14, (md5_uint32) 0x265e5a51); + OP (B, C, D, A, 0, 20, (md5_uint32) 0xe9b6c7aa); + OP (A, B, C, D, 5, 5, (md5_uint32) 0xd62f105d); + OP (D, A, B, C, 10, 9, (md5_uint32) 0x02441453); + OP (C, D, A, B, 15, 14, (md5_uint32) 0xd8a1e681); + OP (B, C, D, A, 4, 20, (md5_uint32) 0xe7d3fbc8); + OP (A, B, C, D, 9, 5, (md5_uint32) 0x21e1cde6); + OP (D, A, B, C, 14, 9, (md5_uint32) 0xc33707d6); + OP (C, D, A, B, 3, 14, (md5_uint32) 0xf4d50d87); + OP (B, C, D, A, 8, 20, (md5_uint32) 0x455a14ed); + OP (A, B, C, D, 13, 5, (md5_uint32) 0xa9e3e905); + OP (D, A, B, C, 2, 9, (md5_uint32) 0xfcefa3f8); + OP (C, D, A, B, 7, 14, (md5_uint32) 0x676f02d9); + OP (B, C, D, A, 12, 20, (md5_uint32) 0x8d2a4c8a); + +#undef FX +#define FX(b, c, d) FH (b, c, d) + + /* Round 3. */ + OP (A, B, C, D, 5, 4, (md5_uint32) 0xfffa3942); + OP (D, A, B, C, 8, 11, (md5_uint32) 0x8771f681); + OP (C, D, A, B, 11, 16, (md5_uint32) 0x6d9d6122); + OP (B, C, D, A, 14, 23, (md5_uint32) 0xfde5380c); + OP (A, B, C, D, 1, 4, (md5_uint32) 0xa4beea44); + OP (D, A, B, C, 4, 11, (md5_uint32) 0x4bdecfa9); + OP (C, D, A, B, 7, 16, (md5_uint32) 0xf6bb4b60); + OP (B, C, D, A, 10, 23, (md5_uint32) 0xbebfbc70); + OP (A, B, C, D, 13, 4, (md5_uint32) 0x289b7ec6); + OP (D, A, B, C, 0, 11, (md5_uint32) 0xeaa127fa); + OP (C, D, A, B, 3, 16, (md5_uint32) 0xd4ef3085); + OP (B, C, D, A, 6, 23, (md5_uint32) 0x04881d05); + OP (A, B, C, D, 9, 4, (md5_uint32) 0xd9d4d039); + OP (D, A, B, C, 12, 11, (md5_uint32) 0xe6db99e5); + OP (C, D, A, B, 15, 16, (md5_uint32) 0x1fa27cf8); + OP (B, C, D, A, 2, 23, (md5_uint32) 0xc4ac5665); + +#undef FX +#define FX(b, c, d) FI (b, c, d) + + /* Round 4. */ + OP (A, B, C, D, 0, 6, (md5_uint32) 0xf4292244); + OP (D, A, B, C, 7, 10, (md5_uint32) 0x432aff97); + OP (C, D, A, B, 14, 15, (md5_uint32) 0xab9423a7); + OP (B, C, D, A, 5, 21, (md5_uint32) 0xfc93a039); + OP (A, B, C, D, 12, 6, (md5_uint32) 0x655b59c3); + OP (D, A, B, C, 3, 10, (md5_uint32) 0x8f0ccc92); + OP (C, D, A, B, 10, 15, (md5_uint32) 0xffeff47d); + OP (B, C, D, A, 1, 21, (md5_uint32) 0x85845dd1); + OP (A, B, C, D, 8, 6, (md5_uint32) 0x6fa87e4f); + OP (D, A, B, C, 15, 10, (md5_uint32) 0xfe2ce6e0); + OP (C, D, A, B, 6, 15, (md5_uint32) 0xa3014314); + OP (B, C, D, A, 13, 21, (md5_uint32) 0x4e0811a1); + OP (A, B, C, D, 4, 6, (md5_uint32) 0xf7537e82); + OP (D, A, B, C, 11, 10, (md5_uint32) 0xbd3af235); + OP (C, D, A, B, 2, 15, (md5_uint32) 0x2ad7d2bb); + OP (B, C, D, A, 9, 21, (md5_uint32) 0xeb86d391); + + /* Add the starting values of the context. */ + A += A_save; + B += B_save; + C += C_save; + D += D_save; + } + + /* Put checksum in context given as argument. */ + ctx->A = A; + ctx->B = B; + ctx->C = C; + ctx->D = D; +} -- cgit v1.2.3