/* -*-c-*-
*
- * $Id: sha256.c,v 1.1 2000/10/15 17:48:14 mdw Exp $
+ * $Id: sha256.c,v 1.2 2004/03/21 22:43:34 mdw Exp $
*
* Implementation of the SHA-256 hash function
*
/*----- Revision history --------------------------------------------------*
*
* $Log: sha256.c,v $
+ * Revision 1.2 2004/03/21 22:43:34 mdw
+ * New hash variant SHA224.
+ *
* Revision 1.1 2000/10/15 17:48:14 mdw
* New SHA variants with longer outputs.
*
/*----- Main code ---------------------------------------------------------*/
-/* --- @sha256_compress@ --- *
+/* --- @sha256_compress@, @sha224_compress@ --- *
*
* Arguments: @sha256_ctx *ctx@ = pointer to context block
* @const void *sbuf@ = pointer to buffer of appropriate size
ctx->h += h;
}
-/* --- @sha256_init@ --- *
+/* --- @sha256_init@, @sha224_init@ --- *
*
* Arguments: @sha256_ctx *ctx@ = pointer to context block to initialize
*
ctx->nl = ctx->nh = 0;
}
-/* --- @sha256_set@ --- *
+void sha224_init(sha256_ctx *ctx)
+{
+ ctx->a = 0xc1059ed8;
+ ctx->b = 0x367cd507;
+ ctx->c = 0x3070dd17;
+ ctx->d = 0xf70e5939;
+ ctx->e = 0xffc00b31;
+ ctx->f = 0x68581511;
+ ctx->g = 0x64f98fa7;
+ ctx->h = 0xbefa4fa4;
+ ctx->off = 0;
+ ctx->nl = ctx->nh = 0;
+}
+
+/* --- @sha256_set@, @sha224_set@ --- *
*
* Arguments: @sha256_ctx *ctx@ = pointer to context block
* @const void *buf@ = pointer to state buffer
ctx->nh = U32(((count & ~MASK32) >> 16) >> 16);
}
-/* --- @sha256_hash@ --- *
+/* --- @sha256_hash@, @sha224_hash@ --- *
*
* Arguments: @sha256_ctx *ctx@ = pointer to context block
* @const void *buf@ = buffer of data to hash
HASH_BUFFER(SHA256, sha256, ctx, buf, sz);
}
-/* --- @sha256_done@ --- *
+/* --- @sha256_done, @sha224_done@ --- *
*
* Arguments: @sha256_ctx *ctx@ = pointer to context block
* @void *hash@ = pointer to output buffer
* Use: Returns the hash of the data read so far.
*/
-void sha256_done(sha256_ctx *ctx, void *hash)
+static void final(sha256_ctx *ctx)
{
- octet *p = hash;
HASH_PAD(SHA256, sha256, ctx, 0x80, 0, 8);
STORE32(ctx->buf + SHA256_BUFSZ - 8, (ctx->nl >> 29) | (ctx->nh << 3));
STORE32(ctx->buf + SHA256_BUFSZ - 4, ctx->nl << 3);
- sha256_compress(ctx, ctx->buf);
+ sha256_compress(ctx, ctx->buf);
+}
+
+void sha256_done(sha256_ctx *ctx, void *hash)
+{
+ octet *p = hash;
+ final(ctx);
STORE32(p + 0, ctx->a);
STORE32(p + 4, ctx->b);
STORE32(p + 8, ctx->c);
STORE32(p + 28, ctx->h);
}
-/* --- @sha256_state@ --- *
+void sha224_done(sha224_ctx *ctx, void *hash)
+{
+ octet *p = hash;
+ final(ctx);
+ STORE32(p + 0, ctx->a);
+ STORE32(p + 4, ctx->b);
+ STORE32(p + 8, ctx->c);
+ STORE32(p + 12, ctx->d);
+ STORE32(p + 16, ctx->e);
+ STORE32(p + 20, ctx->f);
+ STORE32(p + 24, ctx->g);
+}
+
+/* --- @sha256_state@, @sha224_state@ --- *
*
* Arguments: @sha256_ctx *ctx@ = pointer to context
* @void *state@ = pointer to buffer for current state