-/* crypto/idea/i_cfb64.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
- *
+ *
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
+ *
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
- *
+ *
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
+ * 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
+ *
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* 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.
- *
+ *
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
#include <openssl/idea.h>
#include "idea_lcl.h"
-/* The input and output encrypted as though 64bit cfb mode is being
- * used. The extra state information to record how much of the
- * 64bit block we have used is contained in *num;
+/*
+ * The input and output encrypted as though 64bit cfb mode is being used.
+ * The extra state information to record how much of the 64bit block we have
+ * used is contained in *num;
*/
-void idea_cfb64_encrypt(unsigned char *in, unsigned char *out, long length,
- IDEA_KEY_SCHEDULE *schedule, unsigned char *ivec, int *num,
- int encrypt)
- {
- register unsigned long v0,v1,t;
- register int n= *num;
- register long l=length;
- unsigned long ti[2];
- unsigned char *iv,c,cc;
-
- iv=(unsigned char *)ivec;
- if (encrypt)
- {
- while (l--)
- {
- if (n == 0)
- {
- n2l(iv,v0); ti[0]=v0;
- n2l(iv,v1); ti[1]=v1;
- idea_encrypt((unsigned long *)ti,schedule);
- iv=(unsigned char *)ivec;
- t=ti[0]; l2n(t,iv);
- t=ti[1]; l2n(t,iv);
- iv=(unsigned char *)ivec;
- }
- c= *(in++)^iv[n];
- *(out++)=c;
- iv[n]=c;
- n=(n+1)&0x07;
- }
- }
- else
- {
- while (l--)
- {
- if (n == 0)
- {
- n2l(iv,v0); ti[0]=v0;
- n2l(iv,v1); ti[1]=v1;
- idea_encrypt((unsigned long *)ti,schedule);
- iv=(unsigned char *)ivec;
- t=ti[0]; l2n(t,iv);
- t=ti[1]; l2n(t,iv);
- iv=(unsigned char *)ivec;
- }
- cc= *(in++);
- c=iv[n];
- iv[n]=cc;
- *(out++)=c^cc;
- n=(n+1)&0x07;
- }
- }
- v0=v1=ti[0]=ti[1]=t=c=cc=0;
- *num=n;
- }
+void IDEA_cfb64_encrypt(const unsigned char *in, unsigned char *out,
+ long length, IDEA_KEY_SCHEDULE *schedule,
+ unsigned char *ivec, int *num, int encrypt)
+{
+ register unsigned long v0, v1, t;
+ register int n = *num;
+ register long l = length;
+ unsigned long ti[2];
+ unsigned char *iv, c, cc;
+ iv = (unsigned char *)ivec;
+ if (encrypt) {
+ while (l--) {
+ if (n == 0) {
+ n2l(iv, v0);
+ ti[0] = v0;
+ n2l(iv, v1);
+ ti[1] = v1;
+ IDEA_encrypt((unsigned long *)ti, schedule);
+ iv = (unsigned char *)ivec;
+ t = ti[0];
+ l2n(t, iv);
+ t = ti[1];
+ l2n(t, iv);
+ iv = (unsigned char *)ivec;
+ }
+ c = *(in++) ^ iv[n];
+ *(out++) = c;
+ iv[n] = c;
+ n = (n + 1) & 0x07;
+ }
+ } else {
+ while (l--) {
+ if (n == 0) {
+ n2l(iv, v0);
+ ti[0] = v0;
+ n2l(iv, v1);
+ ti[1] = v1;
+ IDEA_encrypt((unsigned long *)ti, schedule);
+ iv = (unsigned char *)ivec;
+ t = ti[0];
+ l2n(t, iv);
+ t = ti[1];
+ l2n(t, iv);
+ iv = (unsigned char *)ivec;
+ }
+ cc = *(in++);
+ c = iv[n];
+ iv[n] = cc;
+ *(out++) = c ^ cc;
+ n = (n + 1) & 0x07;
+ }
+ }
+ v0 = v1 = ti[0] = ti[1] = t = c = cc = 0;
+ *num = n;
+}
projects / openssl.git / blobdiff