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openssl/crypto/camellia/cmll_ctr.c

 /* crypto/camellia/camellia_ctr.c -*- mode:C; c-file-style: "eay" -*- */
 /* ====================================================================
  * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer. 
@@ skipping 31 matching lines @@
  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  * OF THE POSSIBILITY OF SUCH DAMAGE.
  * ====================================================================
  *
  */
 
-#ifndef CAMELLIA_DEBUG
-# ifndef NDEBUG
-#  define NDEBUG
-# endif
-#endif
-#include <assert.h>
+#include <openssl/camellia.h>
+#include <openssl/modes.h>
 
-#include <openssl/camellia.h>
-#include "cmll_locl.h"
-
-/* NOTE: the IV/counter CTR mode is big-endian.  The rest of the Camellia code
- * is endian-neutral. */
-/* increment counter (128-bit int) by 1 */
-static void Camellia_ctr128_inc(unsigned char *counter) 
-        {
-        unsigned long c;
-
-        /* Grab bottom dword of counter and increment */
-        c = GETU32(counter + 12);
-        c++;    c &= 0xFFFFFFFF;
-        PUTU32(counter + 12, c);
-
-        /* if no overflow, we're done */
-        if (c)
-                return;
-
-        /* Grab 1st dword of counter and increment */
-        c = GETU32(counter +  8);
-        c++;    c &= 0xFFFFFFFF;
-        PUTU32(counter +  8, c);
-
-        /* if no overflow, we're done */
-        if (c)
-                return;
-
-        /* Grab 2nd dword of counter and increment */
-        c = GETU32(counter +  4);
-        c++;    c &= 0xFFFFFFFF;
-        PUTU32(counter +  4, c);
-
-        /* if no overflow, we're done */
-        if (c)
-                return;
-
-        /* Grab top dword of counter and increment */
-        c = GETU32(counter +  0);
-        c++;    c &= 0xFFFFFFFF;
-        PUTU32(counter +  0, c);
-        }
-
-/* The input encrypted as though 128bit counter mode is being
- * used.  The extra state information to record how much of the
- * 128bit block we have used is contained in *num, and the
- * encrypted counter is kept in ecount_buf.  Both *num and
- * ecount_buf must be initialised with zeros before the first
- * call to Camellia_ctr128_encrypt().
- *
- * This algorithm assumes that the counter is in the x lower bits
- * of the IV (ivec), and that the application has full control over
- * overflow and the rest of the IV.  This implementation takes NO
- * responsability for checking that the counter doesn't overflow
- * into the rest of the IV when incremented.
- */
 void Camellia_ctr128_encrypt(const unsigned char *in, unsigned char *out,
-        const unsigned long length, const CAMELLIA_KEY *key,
+        size_t length, const CAMELLIA_KEY *key,
         unsigned char ivec[CAMELLIA_BLOCK_SIZE],
         unsigned char ecount_buf[CAMELLIA_BLOCK_SIZE],
         unsigned int *num) 
         {
 
-        unsigned int n;
-        unsigned long l=length;
-
-        assert(in && out && key && counter && num);
-        assert(*num < CAMELLIA_BLOCK_SIZE);
-
-        n = *num;
-
-        while (l--) 
-                {
-                if (n == 0) 
-                        {
-                        Camellia_encrypt(ivec, ecount_buf, key);
-                        Camellia_ctr128_inc(ivec);
-                        }
-                *(out++) = *(in++) ^ ecount_buf[n];
-                n = (n+1) % CAMELLIA_BLOCK_SIZE;
-                }
-
-        *num=n;
+        CRYPTO_ctr128_encrypt(in,out,length,key,ivec,ecount_buf,num,(block128_f)Camellia_encrypt);
         }