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- #ifdef HAVE_CONFIG_H
- # include <config.h>
- #endif
- #include <sys/types.h>
- #if STDC_HEADERS || defined _LIBC
- # include <stdlib.h>
- # include <string.h>
- #else
- # ifndef HAVE_MEMCPY
- # define memcpy(d, s, n) bcopy ((s), (d), (n))
- # endif
- #endif
- #include "md5.h"
- #ifdef _LIBC
- # include <endian.h>
- # 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
- 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 (ctx)
- struct md5_ctx *ctx;
- {
- ctx->A = 0x67452301;
- ctx->B = 0xefcdab89;
- ctx->C = 0x98badcfe;
- ctx->D = 0x10325476;
- ctx->total[0] = ctx->total[1] = 0;
- ctx->buflen = 0;
- }
- void *
- md5_read_ctx (ctx, resbuf)
- 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;
- }
- 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);
- }
- int
- md5_stream (stream, resblock)
- 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)
- {
- 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;
- }
- void *
- md5_buffer (buffer, len, resblock)
- const char *buffer;
- size_t len;
- void *resblock;
- {
- struct md5_ctx ctx;
- /* Initialize the computation context. */
- md5_init_ctx (&ctx);
- md5_process_bytes (buffer, len, &ctx);
- /* Put result in desired memory area. */
- return md5_finish_ctx (&ctx, resblock);
- }
- void
- md5_process_bytes (buffer, len, ctx)
- const void *buffer;
- size_t len;
- struct md5_ctx *ctx;
- {
- 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);
- memcpy (ctx->buffer, &ctx->buffer[(left_over + add) & ~63],
- (left_over + add) & 63);
- ctx->buflen = (left_over + add) & 63;
- }
- buffer = (const char *) buffer + add;
- len -= add;
- }
- /* Process available complete blocks. */
- if (len > 64)
- {
- md5_process_block (buffer, len & ~63, ctx);
- buffer = (const char *) buffer + (len & ~63);
- len &= 63;
- }
- /* Move remaining bytes in internal buffer. */
- if (len > 0)
- {
- memcpy (ctx->buffer, buffer, len);
- ctx->buflen = len;
- }
- }
- #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))
- void
- md5_process_block (buffer, len, ctx)
- const void *buffer;
- size_t len;
- struct md5_ctx *ctx;
- {
- md5_uint32 correct_words[16];
- const md5_uint32 *words = 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;
- 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;
- #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)
- #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, 0xd76aa478);
- OP (D, A, B, C, 12, 0xe8c7b756);
- OP (C, D, A, B, 17, 0x242070db);
- OP (B, C, D, A, 22, 0xc1bdceee);
- OP (A, B, C, D, 7, 0xf57c0faf);
- OP (D, A, B, C, 12, 0x4787c62a);
- OP (C, D, A, B, 17, 0xa8304613);
- OP (B, C, D, A, 22, 0xfd469501);
- OP (A, B, C, D, 7, 0x698098d8);
- OP (D, A, B, C, 12, 0x8b44f7af);
- OP (C, D, A, B, 17, 0xffff5bb1);
- OP (B, C, D, A, 22, 0x895cd7be);
- OP (A, B, C, D, 7, 0x6b901122);
- OP (D, A, B, C, 12, 0xfd987193);
- OP (C, D, A, B, 17, 0xa679438e);
- OP (B, C, D, A, 22, 0x49b40821);
- #undef OP
- #define OP(f, a, b, c, d, k, s, T) \
- do \
- { \
- a += f (b, c, d) + correct_words[k] + T; \
- CYCLIC (a, s); \
- a += b; \
- } \
- while (0)
- /* Round 2. */
- OP (FG, A, B, C, D, 1, 5, 0xf61e2562);
- OP (FG, D, A, B, C, 6, 9, 0xc040b340);
- OP (FG, C, D, A, B, 11, 14, 0x265e5a51);
- OP (FG, B, C, D, A, 0, 20, 0xe9b6c7aa);
- OP (FG, A, B, C, D, 5, 5, 0xd62f105d);
- OP (FG, D, A, B, C, 10, 9, 0x02441453);
- OP (FG, C, D, A, B, 15, 14, 0xd8a1e681);
- OP (FG, B, C, D, A, 4, 20, 0xe7d3fbc8);
- OP (FG, A, B, C, D, 9, 5, 0x21e1cde6);
- OP (FG, D, A, B, C, 14, 9, 0xc33707d6);
- OP (FG, C, D, A, B, 3, 14, 0xf4d50d87);
- OP (FG, B, C, D, A, 8, 20, 0x455a14ed);
- OP (FG, A, B, C, D, 13, 5, 0xa9e3e905);
- OP (FG, D, A, B, C, 2, 9, 0xfcefa3f8);
- OP (FG, C, D, A, B, 7, 14, 0x676f02d9);
- OP (FG, B, C, D, A, 12, 20, 0x8d2a4c8a);
- /* Round 3. */
- OP (FH, A, B, C, D, 5, 4, 0xfffa3942);
- OP (FH, D, A, B, C, 8, 11, 0x8771f681);
- OP (FH, C, D, A, B, 11, 16, 0x6d9d6122);
- OP (FH, B, C, D, A, 14, 23, 0xfde5380c);
- OP (FH, A, B, C, D, 1, 4, 0xa4beea44);
- OP (FH, D, A, B, C, 4, 11, 0x4bdecfa9);
- OP (FH, C, D, A, B, 7, 16, 0xf6bb4b60);
- OP (FH, B, C, D, A, 10, 23, 0xbebfbc70);
- OP (FH, A, B, C, D, 13, 4, 0x289b7ec6);
- OP (FH, D, A, B, C, 0, 11, 0xeaa127fa);
- OP (FH, C, D, A, B, 3, 16, 0xd4ef3085);
- OP (FH, B, C, D, A, 6, 23, 0x04881d05);
- OP (FH, A, B, C, D, 9, 4, 0xd9d4d039);
- OP (FH, D, A, B, C, 12, 11, 0xe6db99e5);
- OP (FH, C, D, A, B, 15, 16, 0x1fa27cf8);
- OP (FH, B, C, D, A, 2, 23, 0xc4ac5665);
- /* Round 4. */
- OP (FI, A, B, C, D, 0, 6, 0xf4292244);
- OP (FI, D, A, B, C, 7, 10, 0x432aff97);
- OP (FI, C, D, A, B, 14, 15, 0xab9423a7);
- OP (FI, B, C, D, A, 5, 21, 0xfc93a039);
- OP (FI, A, B, C, D, 12, 6, 0x655b59c3);
- OP (FI, D, A, B, C, 3, 10, 0x8f0ccc92);
- OP (FI, C, D, A, B, 10, 15, 0xffeff47d);
- OP (FI, B, C, D, A, 1, 21, 0x85845dd1);
- OP (FI, A, B, C, D, 8, 6, 0x6fa87e4f);
- OP (FI, D, A, B, C, 15, 10, 0xfe2ce6e0);
- OP (FI, C, D, A, B, 6, 15, 0xa3014314);
- OP (FI, B, C, D, A, 13, 21, 0x4e0811a1);
- OP (FI, A, B, C, D, 4, 6, 0xf7537e82);
- OP (FI, D, A, B, C, 11, 10, 0xbd3af235);
- OP (FI, C, D, A, B, 2, 15, 0x2ad7d2bb);
- OP (FI, B, C, D, A, 9, 21, 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;
- }
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