1 files changed, 86 insertions, 0 deletions
diff --git a/libtomcrypt/hashes/hash_memory_multi.c b/libtomcrypt/hashes/hash_memory_multi.c
new file mode 100644
index 0000000..c9fafc7
--- /dev/null
+++ b/libtomcrypt/hashes/hash_memory_multi.c
@@ -0,0 +1,86 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ *
+ * Tom St Denis, tomstdenis@gmail.com, http://libtom.org
+ */
+#include "tomcrypt.h"
+#include <stdarg.h>
+/**
+  @file hash_memory_multi.c
+  Hash (multiple buffers) memory helper, Tom St Denis
+*/
+
+/**
+  Hash multiple (non-adjacent) blocks of memory at once.  
+  @param hash   The index of the hash you wish to use
+  @param out    [out] Where to store the digest
+  @param outlen [in/out] Max size and resulting size of the digest
+  @param in     The data you wish to hash
+  @param inlen  The length of the data to hash (octets)
+  @param ...    tuples of (data,len) pairs to hash, terminated with a (NULL,x) (x=don't care)
+  @return CRYPT_OK if successful
+*/  
+int hash_memory_multi(int hash, unsigned char *out, unsigned long *outlen,
+                      const unsigned char *in, unsigned long inlen, ...)
+{
+    struct hash_data hdata;
+    int digest_size;
+    int                  err;
+    va_list              args;
+    const unsigned char *curptr;
+    unsigned long        curlen;
+
+    LTC_ARGCHK(in     != NULL);
+    LTC_ARGCHK(out    != NULL);
+    LTC_ARGCHK(outlen != NULL);
+
+    if ((err = hash_is_valid(hash)) != CRYPT_OK) {
+        return err;
+    }
+
+    digest_size = _ncr_algo_digest_size(hash);
+    if (*outlen < digest_size) {
+       *outlen = digest_size;
+       return CRYPT_BUFFER_OVERFLOW;
+    }
+
+    err = cryptodev_hash_init( &data, _ncr_algo_to_str(hash), 0, NULL, 0);
+    if (err < 0) {
+       err = CRYPT_INVALID_HASH;
+       goto LBL_ERR;
+    }
+
+    va_start(args, inlen);
+    curptr = in; 
+    curlen = inlen;
+    for (;;) {
+       /* process buf */
+       if ((err = _cryptodev_hash_update(&hdata, curptr, curlen)) < 0) {
+	   err = CRYPT_ERROR;
+           goto LBL_ERR;
+       }
+       /* step to next */
+       curptr = va_arg(args, const unsigned char*);
+       if (curptr == NULL) {
+          break;
+       }
+       curlen = va_arg(args, unsigned long);
+    }
+ 
+    err = cryptodev_hash_final(&hdata, out);
+    
+    *outlen = digest_size;
+LBL_ERR:
+#ifdef LTC_CLEAN_STACK
+    zeromem(md, sizeof(hash_state));
+#endif
+    cryptodev_hash_deinit(&hdata);
+    va_end(args);
+    return err;
+}
+