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-rw-r--r--src/libopkg/.svn/text-base/sha256.c.svn-base554
1 files changed, 0 insertions, 554 deletions
diff --git a/src/libopkg/.svn/text-base/sha256.c.svn-base b/src/libopkg/.svn/text-base/sha256.c.svn-base
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--- a/src/libopkg/.svn/text-base/sha256.c.svn-base
+++ /dev/null
@@ -1,554 +0,0 @@
-/* sha256.c - Functions to compute SHA256 and SHA224 message digest of files or
- memory blocks according to the NIST specification FIPS-180-2.
-
- Copyright (C) 2005, 2006, 2008 Free Software Foundation, Inc.
-
- 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 3 of the License, 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, see <http://www.gnu.org/licenses/>. */
-
-/* Written by David Madore, considerably copypasting from
- Scott G. Miller's sha1.c
-*/
-
-#include <config.h>
-
-#include "sha256.h"
-
-#include <stddef.h>
-#include <string.h>
-
-#if USE_UNLOCKED_IO
-# include "unlocked-io.h"
-#endif
-
-#ifdef WORDS_BIGENDIAN
-# define SWAP(n) (n)
-#else
-# define SWAP(n) \
- (((n) << 24) | (((n) & 0xff00) << 8) | (((n) >> 8) & 0xff00) | ((n) >> 24))
-#endif
-
-#define BLOCKSIZE 4096
-#if BLOCKSIZE % 64 != 0
-# error "invalid BLOCKSIZE"
-#endif
-
-/* This array contains the bytes used to pad the buffer to the next
- 64-byte boundary. */
-static const unsigned char fillbuf[64] = { 0x80, 0 /* , 0, 0, ... */ };
-
-
-/*
- Takes a pointer to a 256 bit block of data (eight 32 bit ints) and
- intializes it to the start constants of the SHA256 algorithm. This
- must be called before using hash in the call to sha256_hash
-*/
-void
-sha256_init_ctx (struct sha256_ctx *ctx)
-{
- ctx->state[0] = 0x6a09e667UL;
- ctx->state[1] = 0xbb67ae85UL;
- ctx->state[2] = 0x3c6ef372UL;
- ctx->state[3] = 0xa54ff53aUL;
- ctx->state[4] = 0x510e527fUL;
- ctx->state[5] = 0x9b05688cUL;
- ctx->state[6] = 0x1f83d9abUL;
- ctx->state[7] = 0x5be0cd19UL;
-
- ctx->total[0] = ctx->total[1] = 0;
- ctx->buflen = 0;
-}
-
-void
-sha224_init_ctx (struct sha256_ctx *ctx)
-{
- ctx->state[0] = 0xc1059ed8UL;
- ctx->state[1] = 0x367cd507UL;
- ctx->state[2] = 0x3070dd17UL;
- ctx->state[3] = 0xf70e5939UL;
- ctx->state[4] = 0xffc00b31UL;
- ctx->state[5] = 0x68581511UL;
- ctx->state[6] = 0x64f98fa7UL;
- ctx->state[7] = 0xbefa4fa4UL;
-
- ctx->total[0] = ctx->total[1] = 0;
- ctx->buflen = 0;
-}
-
-/* Copy the value from v into the memory location pointed to by *cp,
- If your architecture allows unaligned access this is equivalent to
- * (uint32_t *) cp = v */
-static inline void
-set_uint32 (char *cp, uint32_t v)
-{
- memcpy (cp, &v, sizeof v);
-}
-
-/* Put result from CTX in first 32 bytes following RESBUF. The result
- must be in little endian byte order. */
-void *
-sha256_read_ctx (const struct sha256_ctx *ctx, void *resbuf)
-{
- int i;
- char *r = resbuf;
-
- for (i = 0; i < 8; i++)
- set_uint32 (r + i * sizeof ctx->state[0], SWAP (ctx->state[i]));
-
- return resbuf;
-}
-
-void *
-sha224_read_ctx (const struct sha256_ctx *ctx, void *resbuf)
-{
- int i;
- char *r = resbuf;
-
- for (i = 0; i < 7; i++)
- set_uint32 (r + i * sizeof ctx->state[0], SWAP (ctx->state[i]));
-
- return resbuf;
-}
-
-/* Process the remaining bytes in the internal buffer and the usual
- prolog according to the standard and write the result to RESBUF. */
-static void
-sha256_conclude_ctx (struct sha256_ctx *ctx)
-{
- /* Take yet unprocessed bytes into account. */
- size_t bytes = ctx->buflen;
- size_t size = (bytes < 56) ? 64 / 4 : 64 * 2 / 4;
-
- /* Now count remaining bytes. */
- ctx->total[0] += bytes;
- if (ctx->total[0] < bytes)
- ++ctx->total[1];
-
- /* Put the 64-bit file length in *bits* at the end of the buffer.
- Use set_uint32 rather than a simple assignment, to avoid risk of
- unaligned access. */
- set_uint32 ((char *) &ctx->buffer[size - 2],
- SWAP ((ctx->total[1] << 3) | (ctx->total[0] >> 29)));
- set_uint32 ((char *) &ctx->buffer[size - 1],
- SWAP (ctx->total[0] << 3));
-
- memcpy (&((char *) ctx->buffer)[bytes], fillbuf, (size - 2) * 4 - bytes);
-
- /* Process last bytes. */
- sha256_process_block (ctx->buffer, size * 4, ctx);
-}
-
-void *
-sha256_finish_ctx (struct sha256_ctx *ctx, void *resbuf)
-{
- sha256_conclude_ctx (ctx);
- return sha256_read_ctx (ctx, resbuf);
-}
-
-void *
-sha224_finish_ctx (struct sha256_ctx *ctx, void *resbuf)
-{
- sha256_conclude_ctx (ctx);
- return sha224_read_ctx (ctx, resbuf);
-}
-
-/* Compute SHA256 message digest for bytes read from STREAM. The
- resulting message digest number will be written into the 32 bytes
- beginning at RESBLOCK. */
-int
-sha256_stream (FILE *stream, void *resblock)
-{
- struct sha256_ctx ctx;
- char buffer[BLOCKSIZE + 72];
- size_t sum;
-
- /* Initialize the computation context. */
- sha256_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. */
- while (1)
- {
- n = fread (buffer + sum, 1, BLOCKSIZE - sum, stream);
-
- sum += n;
-
- if (sum == BLOCKSIZE)
- break;
-
- if (n == 0)
- {
- /* Check for the error flag IFF N == 0, so that we don't
- exit the loop after a partial read due to e.g., EAGAIN
- or EWOULDBLOCK. */
- if (ferror (stream))
- return 1;
- goto process_partial_block;
- }
-
- /* We've read at least one byte, so ignore errors. But always
- check for EOF, since feof may be true even though N > 0.
- Otherwise, we could end up calling fread after EOF. */
- if (feof (stream))
- goto process_partial_block;
- }
-
- /* Process buffer with BLOCKSIZE bytes. Note that
- BLOCKSIZE % 64 == 0
- */
- sha256_process_block (buffer, BLOCKSIZE, &ctx);
- }
-
- process_partial_block:;
-
- /* Process any remaining bytes. */
- if (sum > 0)
- sha256_process_bytes (buffer, sum, &ctx);
-
- /* Construct result in desired memory. */
- sha256_finish_ctx (&ctx, resblock);
- return 0;
-}
-
-/* FIXME: Avoid code duplication */
-int
-sha224_stream (FILE *stream, void *resblock)
-{
- struct sha256_ctx ctx;
- char buffer[BLOCKSIZE + 72];
- size_t sum;
-
- /* Initialize the computation context. */
- sha224_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. */
- while (1)
- {
- n = fread (buffer + sum, 1, BLOCKSIZE - sum, stream);
-
- sum += n;
-
- if (sum == BLOCKSIZE)
- break;
-
- if (n == 0)
- {
- /* Check for the error flag IFF N == 0, so that we don't
- exit the loop after a partial read due to e.g., EAGAIN
- or EWOULDBLOCK. */
- if (ferror (stream))
- return 1;
- goto process_partial_block;
- }
-
- /* We've read at least one byte, so ignore errors. But always
- check for EOF, since feof may be true even though N > 0.
- Otherwise, we could end up calling fread after EOF. */
- if (feof (stream))
- goto process_partial_block;
- }
-
- /* Process buffer with BLOCKSIZE bytes. Note that
- BLOCKSIZE % 64 == 0
- */
- sha256_process_block (buffer, BLOCKSIZE, &ctx);
- }
-
- process_partial_block:;
-
- /* Process any remaining bytes. */
- if (sum > 0)
- sha256_process_bytes (buffer, sum, &ctx);
-
- /* Construct result in desired memory. */
- sha224_finish_ctx (&ctx, resblock);
- return 0;
-}
-
-/* Compute SHA512 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 *
-sha256_buffer (const char *buffer, size_t len, void *resblock)
-{
- struct sha256_ctx ctx;
-
- /* Initialize the computation context. */
- sha256_init_ctx (&ctx);
-
- /* Process whole buffer but last len % 64 bytes. */
- sha256_process_bytes (buffer, len, &ctx);
-
- /* Put result in desired memory area. */
- return sha256_finish_ctx (&ctx, resblock);
-}
-
-void *
-sha224_buffer (const char *buffer, size_t len, void *resblock)
-{
- struct sha256_ctx ctx;
-
- /* Initialize the computation context. */
- sha224_init_ctx (&ctx);
-
- /* Process whole buffer but last len % 64 bytes. */
- sha256_process_bytes (buffer, len, &ctx);
-
- /* Put result in desired memory area. */
- return sha224_finish_ctx (&ctx, resblock);
-}
-
-void
-sha256_process_bytes (const void *buffer, size_t len, struct sha256_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 (&((char *) ctx->buffer)[left_over], buffer, add);
- ctx->buflen += add;
-
- if (ctx->buflen > 64)
- {
- sha256_process_block (ctx->buffer, ctx->buflen & ~63, ctx);
-
- ctx->buflen &= 63;
- /* The regions in the following copy operation cannot overlap. */
- memcpy (ctx->buffer,
- &((char *) ctx->buffer)[(left_over + add) & ~63],
- ctx->buflen);
- }
-
- buffer = (const char *) buffer + add;
- len -= add;
- }
-
- /* Process available complete blocks. */
- if (len >= 64)
- {
-#if !_STRING_ARCH_unaligned
-# define alignof(type) offsetof (struct { char c; type x; }, x)
-# define UNALIGNED_P(p) (((size_t) p) % alignof (uint32_t) != 0)
- if (UNALIGNED_P (buffer))
- while (len > 64)
- {
- sha256_process_block (memcpy (ctx->buffer, buffer, 64), 64, ctx);
- buffer = (const char *) buffer + 64;
- len -= 64;
- }
- else
-#endif
- {
- sha256_process_block (buffer, len & ~63, ctx);
- buffer = (const char *) buffer + (len & ~63);
- len &= 63;
- }
- }
-
- /* Move remaining bytes in internal buffer. */
- if (len > 0)
- {
- size_t left_over = ctx->buflen;
-
- memcpy (&((char *) ctx->buffer)[left_over], buffer, len);
- left_over += len;
- if (left_over >= 64)
- {
- sha256_process_block (ctx->buffer, 64, ctx);
- left_over -= 64;
- memcpy (ctx->buffer, &ctx->buffer[16], left_over);
- }
- ctx->buflen = left_over;
- }
-}
-
-/* --- Code below is the primary difference between sha1.c and sha256.c --- */
-
-/* SHA256 round constants */
-#define K(I) sha256_round_constants[I]
-static const uint32_t sha256_round_constants[64] = {
- 0x428a2f98UL, 0x71374491UL, 0xb5c0fbcfUL, 0xe9b5dba5UL,
- 0x3956c25bUL, 0x59f111f1UL, 0x923f82a4UL, 0xab1c5ed5UL,
- 0xd807aa98UL, 0x12835b01UL, 0x243185beUL, 0x550c7dc3UL,
- 0x72be5d74UL, 0x80deb1feUL, 0x9bdc06a7UL, 0xc19bf174UL,
- 0xe49b69c1UL, 0xefbe4786UL, 0x0fc19dc6UL, 0x240ca1ccUL,
- 0x2de92c6fUL, 0x4a7484aaUL, 0x5cb0a9dcUL, 0x76f988daUL,
- 0x983e5152UL, 0xa831c66dUL, 0xb00327c8UL, 0xbf597fc7UL,
- 0xc6e00bf3UL, 0xd5a79147UL, 0x06ca6351UL, 0x14292967UL,
- 0x27b70a85UL, 0x2e1b2138UL, 0x4d2c6dfcUL, 0x53380d13UL,
- 0x650a7354UL, 0x766a0abbUL, 0x81c2c92eUL, 0x92722c85UL,
- 0xa2bfe8a1UL, 0xa81a664bUL, 0xc24b8b70UL, 0xc76c51a3UL,
- 0xd192e819UL, 0xd6990624UL, 0xf40e3585UL, 0x106aa070UL,
- 0x19a4c116UL, 0x1e376c08UL, 0x2748774cUL, 0x34b0bcb5UL,
- 0x391c0cb3UL, 0x4ed8aa4aUL, 0x5b9cca4fUL, 0x682e6ff3UL,
- 0x748f82eeUL, 0x78a5636fUL, 0x84c87814UL, 0x8cc70208UL,
- 0x90befffaUL, 0xa4506cebUL, 0xbef9a3f7UL, 0xc67178f2UL,
-};
-
-/* Round functions. */
-#define F2(A,B,C) ( ( A & B ) | ( C & ( A | B ) ) )
-#define F1(E,F,G) ( G ^ ( E & ( F ^ G ) ) )
-
-/* Process LEN bytes of BUFFER, accumulating context into CTX.
- It is assumed that LEN % 64 == 0.
- Most of this code comes from GnuPG's cipher/sha1.c. */
-
-void
-sha256_process_block (const void *buffer, size_t len, struct sha256_ctx *ctx)
-{
- const uint32_t *words = buffer;
- size_t nwords = len / sizeof (uint32_t);
- const uint32_t *endp = words + nwords;
- uint32_t x[16];
- uint32_t a = ctx->state[0];
- uint32_t b = ctx->state[1];
- uint32_t c = ctx->state[2];
- uint32_t d = ctx->state[3];
- uint32_t e = ctx->state[4];
- uint32_t f = ctx->state[5];
- uint32_t g = ctx->state[6];
- uint32_t h = ctx->state[7];
-
- /* First increment the byte count. FIPS PUB 180-2 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];
-
-#define rol(x, n) (((x) << (n)) | ((x) >> (32 - (n))))
-#define S0(x) (rol(x,25)^rol(x,14)^(x>>3))
-#define S1(x) (rol(x,15)^rol(x,13)^(x>>10))
-#define SS0(x) (rol(x,30)^rol(x,19)^rol(x,10))
-#define SS1(x) (rol(x,26)^rol(x,21)^rol(x,7))
-
-#define M(I) ( tm = S1(x[(I-2)&0x0f]) + x[(I-7)&0x0f] \
- + S0(x[(I-15)&0x0f]) + x[I&0x0f] \
- , x[I&0x0f] = tm )
-
-#define R(A,B,C,D,E,F,G,H,K,M) do { t0 = SS0(A) + F2(A,B,C); \
- t1 = H + SS1(E) \
- + F1(E,F,G) \
- + K \
- + M; \
- D += t1; H = t0 + t1; \
- } while(0)
-
- while (words < endp)
- {
- uint32_t tm;
- uint32_t t0, t1;
- int t;
- /* FIXME: see sha1.c for a better implementation. */
- for (t = 0; t < 16; t++)
- {
- x[t] = SWAP (*words);
- words++;
- }
-
- R( a, b, c, d, e, f, g, h, K( 0), x[ 0] );
- R( h, a, b, c, d, e, f, g, K( 1), x[ 1] );
- R( g, h, a, b, c, d, e, f, K( 2), x[ 2] );
- R( f, g, h, a, b, c, d, e, K( 3), x[ 3] );
- R( e, f, g, h, a, b, c, d, K( 4), x[ 4] );
- R( d, e, f, g, h, a, b, c, K( 5), x[ 5] );
- R( c, d, e, f, g, h, a, b, K( 6), x[ 6] );
- R( b, c, d, e, f, g, h, a, K( 7), x[ 7] );
- R( a, b, c, d, e, f, g, h, K( 8), x[ 8] );
- R( h, a, b, c, d, e, f, g, K( 9), x[ 9] );
- R( g, h, a, b, c, d, e, f, K(10), x[10] );
- R( f, g, h, a, b, c, d, e, K(11), x[11] );
- R( e, f, g, h, a, b, c, d, K(12), x[12] );
- R( d, e, f, g, h, a, b, c, K(13), x[13] );
- R( c, d, e, f, g, h, a, b, K(14), x[14] );
- R( b, c, d, e, f, g, h, a, K(15), x[15] );
- R( a, b, c, d, e, f, g, h, K(16), M(16) );
- R( h, a, b, c, d, e, f, g, K(17), M(17) );
- R( g, h, a, b, c, d, e, f, K(18), M(18) );
- R( f, g, h, a, b, c, d, e, K(19), M(19) );
- R( e, f, g, h, a, b, c, d, K(20), M(20) );
- R( d, e, f, g, h, a, b, c, K(21), M(21) );
- R( c, d, e, f, g, h, a, b, K(22), M(22) );
- R( b, c, d, e, f, g, h, a, K(23), M(23) );
- R( a, b, c, d, e, f, g, h, K(24), M(24) );
- R( h, a, b, c, d, e, f, g, K(25), M(25) );
- R( g, h, a, b, c, d, e, f, K(26), M(26) );
- R( f, g, h, a, b, c, d, e, K(27), M(27) );
- R( e, f, g, h, a, b, c, d, K(28), M(28) );
- R( d, e, f, g, h, a, b, c, K(29), M(29) );
- R( c, d, e, f, g, h, a, b, K(30), M(30) );
- R( b, c, d, e, f, g, h, a, K(31), M(31) );
- R( a, b, c, d, e, f, g, h, K(32), M(32) );
- R( h, a, b, c, d, e, f, g, K(33), M(33) );
- R( g, h, a, b, c, d, e, f, K(34), M(34) );
- R( f, g, h, a, b, c, d, e, K(35), M(35) );
- R( e, f, g, h, a, b, c, d, K(36), M(36) );
- R( d, e, f, g, h, a, b, c, K(37), M(37) );
- R( c, d, e, f, g, h, a, b, K(38), M(38) );
- R( b, c, d, e, f, g, h, a, K(39), M(39) );
- R( a, b, c, d, e, f, g, h, K(40), M(40) );
- R( h, a, b, c, d, e, f, g, K(41), M(41) );
- R( g, h, a, b, c, d, e, f, K(42), M(42) );
- R( f, g, h, a, b, c, d, e, K(43), M(43) );
- R( e, f, g, h, a, b, c, d, K(44), M(44) );
- R( d, e, f, g, h, a, b, c, K(45), M(45) );
- R( c, d, e, f, g, h, a, b, K(46), M(46) );
- R( b, c, d, e, f, g, h, a, K(47), M(47) );
- R( a, b, c, d, e, f, g, h, K(48), M(48) );
- R( h, a, b, c, d, e, f, g, K(49), M(49) );
- R( g, h, a, b, c, d, e, f, K(50), M(50) );
- R( f, g, h, a, b, c, d, e, K(51), M(51) );
- R( e, f, g, h, a, b, c, d, K(52), M(52) );
- R( d, e, f, g, h, a, b, c, K(53), M(53) );
- R( c, d, e, f, g, h, a, b, K(54), M(54) );
- R( b, c, d, e, f, g, h, a, K(55), M(55) );
- R( a, b, c, d, e, f, g, h, K(56), M(56) );
- R( h, a, b, c, d, e, f, g, K(57), M(57) );
- R( g, h, a, b, c, d, e, f, K(58), M(58) );
- R( f, g, h, a, b, c, d, e, K(59), M(59) );
- R( e, f, g, h, a, b, c, d, K(60), M(60) );
- R( d, e, f, g, h, a, b, c, K(61), M(61) );
- R( c, d, e, f, g, h, a, b, K(62), M(62) );
- R( b, c, d, e, f, g, h, a, K(63), M(63) );
-
- a = ctx->state[0] += a;
- b = ctx->state[1] += b;
- c = ctx->state[2] += c;
- d = ctx->state[3] += d;
- e = ctx->state[4] += e;
- f = ctx->state[5] += f;
- g = ctx->state[6] += g;
- h = ctx->state[7] += h;
- }
-}
generated by cgit v0.9.1 at 2024-11-23 00:59:02 (EST)