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-rw-r--r--lib/sha256.c198
1 files changed, 26 insertions, 172 deletions
diff --git a/lib/sha256.c b/lib/sha256.c
index 449a9b7b712..c9ca618c67e 100644
--- a/lib/sha256.c
+++ b/lib/sha256.c
@@ -1,19 +1,19 @@
/* 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, 2008-2017 Free Software Foundation, Inc.
+ Copyright (C) 2005-2006, 2008-2022 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 file is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of the
+ License, or (at your option) any later version.
- This program is distributed in the hope that it will be useful,
+ This file 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.
+ GNU Lesser General Public License for more details.
- You should have received a copy of the GNU General Public License
+ You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by David Madore, considerably copypasting from
@@ -22,6 +22,7 @@
#include <config.h>
+/* Specification. */
#if HAVE_OPENSSL_SHA256
# define GL_OPENSSL_INLINE _GL_EXTERN_INLINE
#endif
@@ -29,26 +30,17 @@
#include <stdalign.h>
#include <stdint.h>
-#include <stdlib.h>
#include <string.h>
-#if USE_UNLOCKED_IO
-# 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))
-#endif
-
-#define BLOCKSIZE 32768
-#if BLOCKSIZE % 64 != 0
-# error "invalid BLOCKSIZE"
+# define SWAP(n) bswap_32 (n)
#endif
#if ! HAVE_OPENSSL_SHA256
+
/* 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, ... */ };
@@ -91,17 +83,17 @@ 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)
{
@@ -167,154 +159,8 @@ sha224_finish_ctx (struct sha256_ctx *ctx, void *resbuf)
sha256_conclude_ctx (ctx);
return sha224_read_ctx (ctx, 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)
-{
- struct sha256_ctx ctx;
- size_t sum;
-
- char *buffer = malloc (BLOCKSIZE + 72);
- if (!buffer)
- return 1;
-
- /* 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))
- {
- 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);
-
- /* Construct result in desired memory. */
- sha256_finish_ctx (&ctx, resblock);
- free (buffer);
- return 0;
-}
-
-/* FIXME: Avoid code duplication */
-int
-sha224_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);
-
- /* Construct result in desired memory. */
- sha224_finish_ctx (&ctx, resblock);
- free (buffer);
- return 0;
-}
-#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. */
@@ -576,4 +422,12 @@ sha256_process_block (const void *buffer, size_t len, struct sha256_ctx *ctx)
h = ctx->state[7] += h;
}
}
+
#endif
+
+/*
+ * Hey Emacs!
+ * Local Variables:
+ * coding: utf-8
+ * End:
+ */
generated by cgit v1.2.3 (git 2.39.1) at 2025-04-08 03:32:53 +0000