/* sha1.c - Functions to compute SHA1 message digest of files or
memory blocks according to the NIST specification FIPS-180-1.
- Copyright (C) 2000, 2001, 2003, 2004, 2005, 2006 Free Software
+ Copyright (C) 2000, 2001, 2003, 2004, 2005, 2006, 2008 Free Software
Foundation, Inc.
This program is free software; you can redistribute it and/or modify it
Robert Klep <robert@ilse.nl> -- Expansion function fix
*/
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
#include "sha1.h"
ctx->buflen = 0;
}
-/* Put result from CTX in first 20 bytes following RESBUF. The result
- must be in little endian byte order.
+/* Copy the 4 byte 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);
+}
- IMPORTANT: On some systems it is required that RESBUF is correctly
- aligned for a 32-bit value. */
+/* Put result from CTX in first 20 bytes following RESBUF. The result
+ must be in little endian byte order. */
void *
sha1_read_ctx (const struct sha1_ctx *ctx, void *resbuf)
{
- ((uint32_t *) resbuf)[0] = SWAP (ctx->A);
- ((uint32_t *) resbuf)[1] = SWAP (ctx->B);
- ((uint32_t *) resbuf)[2] = SWAP (ctx->C);
- ((uint32_t *) resbuf)[3] = SWAP (ctx->D);
- ((uint32_t *) resbuf)[4] = SWAP (ctx->E);
+ char *r = resbuf;
+ set_uint32 (r + 0 * sizeof ctx->A, SWAP (ctx->A));
+ set_uint32 (r + 1 * sizeof ctx->B, SWAP (ctx->B));
+ set_uint32 (r + 2 * sizeof ctx->C, SWAP (ctx->C));
+ set_uint32 (r + 3 * sizeof ctx->D, SWAP (ctx->D));
+ set_uint32 (r + 4 * sizeof ctx->E, SWAP (ctx->E));
return resbuf;
}
/* Process the remaining bytes in the internal buffer and the usual
- prolog according to the standard and write the result to RESBUF.
-
- IMPORTANT: On some systems it is required that RESBUF is correctly
- aligned for a 32-bit value. */
+ prolog according to the standard and write the result to RESBUF. */
void *
sha1_finish_ctx (struct sha1_ctx *ctx, void *resbuf)
{
return 0;
}
-/* Compute MD5 message digest for LEN bytes beginning at BUFFER. The
+/* Compute SHA1 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. */
/* --- Code below is the primary difference between md5.c and sha1.c --- */
/* SHA1 round constants */
-#define K1 0x5a827999L
-#define K2 0x6ed9eba1L
-#define K3 0x8f1bbcdcL
-#define K4 0xca62c1d6L
+#define K1 0x5a827999
+#define K2 0x6ed9eba1
+#define K3 0x8f1bbcdc
+#define K4 0xca62c1d6
/* Round functions. Note that F2 is the same as F4. */
#define F1(B,C,D) ( D ^ ( B & ( C ^ D ) ) )
if (ctx->total[0] < len)
++ctx->total[1];
-#define rol(x, n) (((x) << (n)) | ((x) >> (32 - (n))))
+#define rol(x, n) (((x) << (n)) | ((uint32_t) (x) >> (32 - (n))))
#define M(I) ( tm = x[I&0x0f] ^ x[(I-14)&0x0f] \
^ x[(I-8)&0x0f] ^ x[(I-3)&0x0f] \