diff options
Diffstat (limited to 'lib/sha256.c')
| -rw-r--r-- | lib/sha256.c | 137 |
1 files changed, 47 insertions, 90 deletions
diff --git a/lib/sha256.c b/lib/sha256.c index 85405b20fdf..c518517077c 100644 --- a/lib/sha256.c +++ b/lib/sha256.c @@ -36,11 +36,11 @@ # include "unlocked-io.h" #endif +#include <byteswap.h> #ifdef WORDS_BIGENDIAN # define SWAP(n) (n) #else -# define SWAP(n) \ - (((n) << 24) | (((n) & 0xff00) << 8) | (((n) >> 8) & 0xff00) | ((n) >> 24)) +# define SWAP(n) bswap_32 (n) #endif #define BLOCKSIZE 32768 @@ -91,17 +91,17 @@ sha224_init_ctx (struct sha256_ctx *ctx) 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 */ +/* Copy the value from v into the memory location pointed to by *CP, + If your architecture allows unaligned access, this is equivalent to + * (__typeof__ (v) *) cp = v */ static 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. */ +/* 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) { @@ -169,21 +169,32 @@ sha224_finish_ctx (struct sha256_ctx *ctx, void *resbuf) } #endif -/* 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) +#ifdef GL_COMPILE_CRYPTO_STREAM + +#include "af_alg.h" + +/* Compute message digest for bytes read from STREAM using algorithm ALG. + Write the message digest into RESBLOCK, which contains HASHLEN bytes. + The initial and finishing operations are INIT_CTX and FINISH_CTX. + Return zero if and only if successful. */ +static int +shaxxx_stream (FILE *stream, char const *alg, void *resblock, + ssize_t hashlen, void (*init_ctx) (struct sha256_ctx *), + void *(*finish_ctx) (struct sha256_ctx *, void *)) { - struct sha256_ctx ctx; - size_t sum; + switch (afalg_stream (stream, alg, resblock, hashlen)) + { + case 0: return 0; + case -EIO: return 1; + } char *buffer = malloc (BLOCKSIZE + 72); if (!buffer) return 1; - /* Initialize the computation context. */ - sha256_init_ctx (&ctx); + struct sha256_ctx ctx; + init_ctx (&ctx); + size_t sum; /* Iterate over full file contents. */ while (1) @@ -197,6 +208,14 @@ sha256_stream (FILE *stream, void *resblock) /* Read block. Take care for partial reads. */ while (1) { + /* Either process a partial fread() from this loop, + or the fread() in afalg_stream may have gotten EOF. + We need to avoid a subsequent fread() as EOF may + not be sticky. For details of such systems, see: + https://sourceware.org/bugzilla/show_bug.cgi?id=1190 */ + if (feof (stream)) + goto process_partial_block; + n = fread (buffer + sum, 1, BLOCKSIZE - sum, stream); sum += n; @@ -216,12 +235,6 @@ sha256_stream (FILE *stream, void *resblock) } 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 @@ -237,84 +250,28 @@ sha256_stream (FILE *stream, void *resblock) sha256_process_bytes (buffer, sum, &ctx); /* Construct result in desired memory. */ - sha256_finish_ctx (&ctx, resblock); + finish_ctx (&ctx, resblock); free (buffer); return 0; } -/* FIXME: Avoid code duplication */ int -sha224_stream (FILE *stream, void *resblock) +sha256_stream (FILE *stream, void *resblock) { - struct sha256_ctx ctx; - size_t sum; - - char *buffer = malloc (BLOCKSIZE + 72); - if (!buffer) - return 1; - - /* 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)) - { - free (buffer); - 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); + return shaxxx_stream (stream, "sha256", resblock, SHA256_DIGEST_SIZE, + sha256_init_ctx, sha256_finish_ctx); +} - /* Construct result in desired memory. */ - sha224_finish_ctx (&ctx, resblock); - free (buffer); - return 0; +int +sha224_stream (FILE *stream, void *resblock) +{ + return shaxxx_stream (stream, "sha224", resblock, SHA224_DIGEST_SIZE, + sha224_init_ctx, sha224_finish_ctx); } +#endif #if ! HAVE_OPENSSL_SHA256 -/* Compute SHA512 message digest for LEN bytes beginning at BUFFER. The +/* Compute SHA256 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. */ |