[PATCH] PPC assembly implementation of SHA1

[git.git] / ppc / sha1.c

diff --git a/ppc/sha1.c b/ppc/sha1.c
new file mode 100644 (file)
index 0000000..5ba4fc5
--- /dev/null
+++ b/ppc/sha1.c
@@ -0,0 +1,72 @@
+/*
+ * SHA-1 implementation.
+ *
+ * Copyright (C) 2005 Paul Mackerras <paulus@samba.org>
+ *
+ * This version assumes we are running on a big-endian machine.
+ * It calls an external sha1_core() to process blocks of 64 bytes.
+ */
+#include <stdio.h>
+#include <string.h>
+#include "sha1.h"
+
+extern void sha1_core(uint32_t *hash, const unsigned char *p,
+                     unsigned int nblocks);
+
+int SHA1_Init(SHA_CTX *c)
+{
+       c->hash[0] = 0x67452301;
+       c->hash[1] = 0xEFCDAB89;
+       c->hash[2] = 0x98BADCFE;
+       c->hash[3] = 0x10325476;
+       c->hash[4] = 0xC3D2E1F0;
+       c->len = 0;
+       c->cnt = 0;
+       return 0;
+}
+
+int SHA1_Update(SHA_CTX *c, const void *ptr, unsigned long n)
+{
+       unsigned long nb;
+       const unsigned char *p = ptr;
+
+       c->len += n << 3;
+       while (n != 0) {
+               if (c->cnt || n < 64) {
+                       nb = 64 - c->cnt;
+                       if (nb > n)
+                               nb = n;
+                       memcpy(&c->buf.b[c->cnt], p, nb);
+                       if ((c->cnt += nb) == 64) {
+                               sha1_core(c->hash, c->buf.b, 1);
+                               c->cnt = 0;
+                       }
+               } else {
+                       nb = n >> 6;
+                       sha1_core(c->hash, p, nb);
+                       nb <<= 6;
+               }
+               n -= nb;
+               p += nb;
+       }
+       return 0;
+}      
+
+int SHA1_Final(unsigned char *hash, SHA_CTX *c)
+{
+       unsigned int cnt = c->cnt;
+
+       c->buf.b[cnt++] = 0x80;
+       if (cnt > 56) {
+               if (cnt < 64)
+                       memset(&c->buf.b[cnt], 0, 64 - cnt);
+               sha1_core(c->hash, c->buf.b, 1);
+               cnt = 0;
+       }
+       if (cnt < 56)
+               memset(&c->buf.b[cnt], 0, 56 - cnt);
+       c->buf.l[7] = c->len;
+       sha1_core(c->hash, c->buf.b, 1);
+       memcpy(hash, c->hash, 20);
+       return 0;
+}