From 1834ba06ac55a1c627ed601e5cf7f649dbde12f0 Mon Sep 17 00:00:00 2001 From: Paul Eggert Date: Thu, 12 Jan 2006 07:17:25 +0000 Subject: Fix commentary to match md5 better. Adjust to .h file changes. --- lib/sha512.c | 49 +++++++++++++++++++++---------------------------- 1 file changed, 21 insertions(+), 28 deletions(-) (limited to 'lib/sha512.c') diff --git a/lib/sha512.c b/lib/sha512.c index 11c3b1d16..79c03e216 100644 --- a/lib/sha512.c +++ b/lib/sha512.c @@ -34,28 +34,22 @@ # include "unlocked-io.h" #endif -/* - Not-swap is a macro that does an endian swap on architectures that are - big-endian, as SHA512 needs some data in a little-endian format -*/ - #ifdef WORDS_BIGENDIAN -# define NOTSWAP(n) (n) +# define SWAP(n) (n) #else -# define NOTSWAP(n) \ +# define SWAP(n) \ (((n) << 56) | (((n) & 0xff00) << 40) | (((n) & 0xff0000UL) << 24) \ - | (((n) & 0xff000000UL) << 8) | (((n) >> 8) & 0xff000000UL) \ - | (((n) >> 24) & 0xff0000UL) | (((n) >> 40) & 0xff00UL) | ((n) >> 56)) + | (((n) & 0xff000000UL) << 8) | (((n) >> 8) & 0xff000000UL) \ + | (((n) >> 24) & 0xff0000UL) | (((n) >> 40) & 0xff00UL) | ((n) >> 56)) #endif #define BLOCKSIZE 4096 -/* Ensure that BLOCKSIZE is a multiple of 128. */ #if BLOCKSIZE % 128 != 0 # error "invalid BLOCKSIZE" #endif /* This array contains the bytes used to pad the buffer to the next - 64-byte boundary. */ + 128-byte boundary. */ static const unsigned char fillbuf[128] = { 0x80, 0 /* , 0, 0, ... */ }; @@ -106,8 +100,8 @@ sha512_read_ctx (const struct sha512_ctx *ctx, void *resbuf) { int i; - for ( i=0 ; i<8 ; i++ ) - ((uint64_t *) resbuf)[i] = NOTSWAP (ctx->state[i]); + for (i = 0; i < 8; i++) + ((uint64_t *) resbuf)[i] = SWAP (ctx->state[i]); return resbuf; } @@ -117,8 +111,8 @@ sha384_read_ctx (const struct sha512_ctx *ctx, void *resbuf) { int i; - for ( i=0 ; i<6 ; i++ ) - ((uint64_t *) resbuf)[i] = NOTSWAP (ctx->state[i]); + for (i = 0; i < 6; i++) + ((uint64_t *) resbuf)[i] = SWAP (ctx->state[i]); return resbuf; } @@ -133,23 +127,21 @@ sha512_conclude_ctx (struct sha512_ctx *ctx) { /* Take yet unprocessed bytes into account. */ uint64_t bytes = ctx->buflen; - size_t pad; + size_t size = (bytes < 112) ? 128 / 8 : 128 * 2 / 8; /* Now count remaining bytes. */ ctx->total[0] += bytes; if (ctx->total[0] < bytes) ++ctx->total[1]; - pad = bytes >= 112 ? 128 + 112 - bytes : 112 - bytes; - memcpy (&ctx->buffer[bytes], fillbuf, pad); - /* Put the 64-bit file length in *bits* at the end of the buffer. */ - *(uint64_t *) &ctx->buffer[bytes + pad + 8] = NOTSWAP (ctx->total[0] << 3); - *(uint64_t *) &ctx->buffer[bytes + pad] = NOTSWAP ((ctx->total[1] << 3) | - (ctx->total[0] >> 61)); + ctx->buffer[size - 2] = SWAP ((ctx->total[1] << 3) | (ctx->total[0] >> 61)); + ctx->buffer[size - 1] = SWAP (ctx->total[0] << 3); + + memcpy (&((char *) ctx->buffer)[bytes], fillbuf, (size - 2) * 8 - bytes); /* Process last bytes. */ - sha512_process_block (ctx->buffer, bytes + pad + 16, ctx); + sha512_process_block (ctx->buffer, size * 8, ctx); } void * @@ -340,7 +332,7 @@ sha512_process_bytes (const void *buffer, size_t len, struct sha512_ctx *ctx) size_t left_over = ctx->buflen; size_t add = 256 - left_over > len ? len : 256 - left_over; - memcpy (&ctx->buffer[left_over], buffer, add); + memcpy (&((char *) ctx->buffer)[left_over], buffer, add); ctx->buflen += add; if (ctx->buflen > 128) @@ -349,7 +341,8 @@ sha512_process_bytes (const void *buffer, size_t len, struct sha512_ctx *ctx) ctx->buflen &= 127; /* The regions in the following copy operation cannot overlap. */ - memcpy (ctx->buffer, &ctx->buffer[(left_over + add) & ~127], + memcpy (ctx->buffer, + &((char *) ctx->buffer)[(left_over + add) & ~127], ctx->buflen); } @@ -384,13 +377,13 @@ sha512_process_bytes (const void *buffer, size_t len, struct sha512_ctx *ctx) { size_t left_over = ctx->buflen; - memcpy (&ctx->buffer[left_over], buffer, len); + memcpy (&((char *) ctx->buffer)[left_over], buffer, len); left_over += len; if (left_over >= 128) { sha512_process_block (ctx->buffer, 128, ctx); left_over -= 128; - memcpy (ctx->buffer, &ctx->buffer[128], left_over); + memcpy (ctx->buffer, &ctx->buffer[16], left_over); } ctx->buflen = left_over; } @@ -469,7 +462,7 @@ sha512_process_block (const void *buffer, size_t len, struct sha512_ctx *ctx) /* FIXME: see sha1.c for a better implementation. */ for (t = 0; t < 16; t++) { - x[t] = NOTSWAP (*words); + x[t] = SWAP (*words); words++; } -- cgit v1.2.3-54-g00ecf