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The counter is big-endian. Since it comes as an array of char,

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there's absolutely no need to special-case it on little-endian
machines.

Notified by Thierry Boivin <Thierry.Boivin@celsecat.com>
This commit is contained in:
Richard Levitte 2003-07-04 11:37:50 +00:00
parent 2ae0352b0f
commit 61f00386ab
1 changed files with 1 additions and 26 deletions
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27
crypto/aes/aes_ctr.c
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@ -59,7 +59,7 @@
#include <openssl/aes.h>
#include "aes_locl.h"
/* NOTE: CTR mode is big-endian. The rest of the AES code
/* NOTE: the IV/counter CTR mode is big-endian. The rest of the AES code
* is endian-neutral. */
/* increment counter (128-bit int) by 1 */
@ -67,61 +67,36 @@ static void AES_ctr128_inc(unsigned char *counter) {
unsigned long c;
/* Grab bottom dword of counter and increment */
#ifdef L_ENDIAN
c = GETU32(counter + 0);
c++;
PUTU32(counter + 0, c);
#else
c = GETU32(counter + 12);
c++;
PUTU32(counter + 12, c);
#endif
/* if no overflow, we're done */
if (c)
return;
/* Grab 1st dword of counter and increment */
#ifdef L_ENDIAN
c = GETU32(counter + 4);
c++;
PUTU32(counter + 4, c);
#else
c = GETU32(counter + 8);
c++;
PUTU32(counter + 8, c);
#endif
/* if no overflow, we're done */
if (c)
return;
/* Grab 2nd dword of counter and increment */
#ifdef L_ENDIAN
c = GETU32(counter + 8);
c++;
PUTU32(counter + 8, c);
#else
c = GETU32(counter + 4);
c++;
PUTU32(counter + 4, c);
#endif
/* if no overflow, we're done */
if (c)
return;
/* Grab top dword of counter and increment */
#ifdef L_ENDIAN
c = GETU32(counter + 12);
c++;
PUTU32(counter + 12, c);
#else
c = GETU32(counter + 0);
c++;
PUTU32(counter + 0, c);
#endif
}
/* The input encrypted as though 128bit counter mode is being