commit files needed for zpm-fetchurl

[zpackage] / libtomcrypt / src / mac / omac / omac_process.c

diff --git a/libtomcrypt/src/mac/omac/omac_process.c b/libtomcrypt/src/mac/omac/omac_process.c
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+++ b/libtomcrypt/src/mac/omac/omac_process.c
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+/* 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.
+ */
+#include "tomcrypt.h"
+
+/**
+  @file omac_process.c
+  OMAC1 support, process data, Tom St Denis
+*/
+
+
+#ifdef LTC_OMAC
+
+/**
+   Process data through OMAC
+   @param omac     The OMAC state
+   @param in       The input data to send through OMAC
+   @param inlen    The length of the input (octets)
+   @return CRYPT_OK if successful
+*/
+int omac_process(omac_state *omac, const unsigned char *in, unsigned long inlen)
+{
+   unsigned long n, x;
+   int           err;
+
+   LTC_ARGCHK(omac  != NULL);
+   LTC_ARGCHK(in    != NULL);
+   if ((err = cipher_is_valid(omac->cipher_idx)) != CRYPT_OK) {
+      return err;
+   }
+
+   if ((omac->buflen > (int)sizeof(omac->block)) || (omac->buflen < 0) ||
+       (omac->blklen > (int)sizeof(omac->block)) || (omac->buflen > omac->blklen)) {
+      return CRYPT_INVALID_ARG;
+   }
+
+#ifdef LTC_FAST
+   {
+     unsigned long blklen = cipher_descriptor[omac->cipher_idx].block_length;
+
+     if (omac->buflen == 0 && inlen > blklen) {
+        unsigned long y;
+        for (x = 0; x < (inlen - blklen); x += blklen) {
+            for (y = 0; y < blklen; y += sizeof(LTC_FAST_TYPE)) {
+                *(LTC_FAST_TYPE_PTR_CAST(&omac->prev[y])) ^= *(LTC_FAST_TYPE_PTR_CAST(&in[y]));
+            }
+            in += blklen;
+            if ((err = cipher_descriptor[omac->cipher_idx].ecb_encrypt(omac->prev, omac->prev, &omac->key)) != CRYPT_OK) {
+               return err;
+            }
+        }
+        inlen -= x;
+     }
+   }
+#endif
+
+   while (inlen != 0) {
+       /* ok if the block is full we xor in prev, encrypt and replace prev */
+       if (omac->buflen == omac->blklen) {
+          for (x = 0; x < (unsigned long)omac->blklen; x++) {
+              omac->block[x] ^= omac->prev[x];
+          }
+          if ((err = cipher_descriptor[omac->cipher_idx].ecb_encrypt(omac->block, omac->prev, &omac->key)) != CRYPT_OK) {
+             return err;
+          }
+          omac->buflen = 0;
+       }
+
+       /* add bytes */
+       n = MIN(inlen, (unsigned long)(omac->blklen - omac->buflen));
+       XMEMCPY(omac->block + omac->buflen, in, n);
+       omac->buflen  += n;
+       inlen         -= n;
+       in            += n;
+   }
+
+   return CRYPT_OK;
+}
+
+#endif
+
+
+/* ref:         $Format:%D$ */
+/* git commit:  $Format:%H$ */
+/* commit time: $Format:%ai$ */