X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=libtomcrypt%2Fsrc%2Fmac%2Fomac%2Fomac_file.c;fp=libtomcrypt%2Fsrc%2Fmac%2Fomac%2Fomac_file.c;h=3f6a85d0c1a13c331ff3c17ecf4fab0df1864e6b;hb=66bc25938679f1d6a1d1200f329093d82a5e99b4;hp=0000000000000000000000000000000000000000;hpb=a52ee0733f420ca20224049260d6fc5cf7d8f621;p=zpackage

diff --git a/libtomcrypt/src/mac/omac/omac_file.c b/libtomcrypt/src/mac/omac/omac_file.c
new file mode 100644
index 0000000..3f6a85d
--- /dev/null
+++ b/libtomcrypt/src/mac/omac/omac_file.c
@@ -0,0 +1,97 @@
+/* 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_file.c
+  OMAC1 support, process a file, Tom St Denis
+*/
+
+#ifdef LTC_OMAC
+
+/**
+   OMAC a file
+   @param cipher   The index of the cipher desired
+   @param key      The secret key
+   @param keylen   The length of the secret key (octets)
+   @param filename The name of the file you wish to OMAC
+   @param out      [out] Where the authentication tag is to be stored
+   @param outlen   [in/out] The max size and resulting size of the authentication tag
+   @return CRYPT_OK if successful, CRYPT_NOP if file support has been disabled
+*/
+int omac_file(int cipher,
+              const unsigned char *key, unsigned long keylen,
+              const char *filename,
+                    unsigned char *out, unsigned long *outlen)
+{
+#ifdef LTC_NO_FILE
+   LTC_UNUSED_PARAM(cipher);
+   LTC_UNUSED_PARAM(key);
+   LTC_UNUSED_PARAM(keylen);
+   LTC_UNUSED_PARAM(filename);
+   LTC_UNUSED_PARAM(out);
+   LTC_UNUSED_PARAM(outlen);
+   return CRYPT_NOP;
+#else
+   size_t x;
+   int err;
+   omac_state omac;
+   FILE *in;
+   unsigned char *buf;
+
+   LTC_ARGCHK(key      != NULL);
+   LTC_ARGCHK(filename != NULL);
+   LTC_ARGCHK(out      != NULL);
+   LTC_ARGCHK(outlen   != NULL);
+
+   if ((buf = XMALLOC(LTC_FILE_READ_BUFSIZE)) == NULL) {
+      return CRYPT_MEM;
+   }
+
+   if ((err = omac_init(&omac, cipher, key, keylen)) != CRYPT_OK) {
+      goto LBL_ERR;
+   }
+
+   in = fopen(filename, "rb");
+   if (in == NULL) {
+      err = CRYPT_FILE_NOTFOUND;
+      goto LBL_ERR;
+   }
+
+   do {
+      x = fread(buf, 1, LTC_FILE_READ_BUFSIZE, in);
+      if ((err = omac_process(&omac, buf, (unsigned long)x)) != CRYPT_OK) {
+         fclose(in);
+         goto LBL_CLEANBUF;
+      }
+   } while (x == LTC_FILE_READ_BUFSIZE);
+
+   if (fclose(in) != 0) {
+      err = CRYPT_ERROR;
+      goto LBL_CLEANBUF;
+   }
+
+   err = omac_done(&omac, out, outlen);
+
+LBL_CLEANBUF:
+   zeromem(buf, LTC_FILE_READ_BUFSIZE);
+LBL_ERR:
+#ifdef LTC_CLEAN_STACK
+   zeromem(&omac, sizeof(omac_state));
+#endif
+   XFREE(buf);
+   return err;
+#endif
+}
+
+#endif
+
+/* ref:         $Format:%D$ */
+/* git commit:  $Format:%H$ */
+/* commit time: $Format:%ai$ */