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-rw-r--r--crypto/des/ofb_enc.c146
1 files changed, 71 insertions, 75 deletions
diff --git a/crypto/des/ofb_enc.c b/crypto/des/ofb_enc.c
index e887a3c6f4bd..02a787752ef3 100644
--- a/crypto/des/ofb_enc.c
+++ b/crypto/des/ofb_enc.c
@@ -5,21 +5,21 @@
* 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:
@@ -34,10 +34,10 @@
* 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
@@ -49,7 +49,7 @@
* 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
@@ -58,78 +58,74 @@
#include "des_locl.h"
-/* The input and output are loaded in multiples of 8 bits.
- * What this means is that if you hame numbits=12 and length=2
- * the first 12 bits will be retrieved from the first byte and half
- * the second. The second 12 bits will come from the 3rd and half the 4th
- * byte.
+/*
+ * The input and output are loaded in multiples of 8 bits. What this means is
+ * that if you hame numbits=12 and length=2 the first 12 bits will be
+ * retrieved from the first byte and half the second. The second 12 bits
+ * will come from the 3rd and half the 4th byte.
*/
void DES_ofb_encrypt(const unsigned char *in, unsigned char *out, int numbits,
- long length, DES_key_schedule *schedule,
- DES_cblock *ivec)
- {
- register DES_LONG d0,d1,vv0,vv1,v0,v1,n=(numbits+7)/8;
- register DES_LONG mask0,mask1;
- register long l=length;
- register int num=numbits;
- DES_LONG ti[2];
- unsigned char *iv;
+ long length, DES_key_schedule *schedule,
+ DES_cblock *ivec)
+{
+ register DES_LONG d0, d1, vv0, vv1, v0, v1, n = (numbits + 7) / 8;
+ register DES_LONG mask0, mask1;
+ register long l = length;
+ register int num = numbits;
+ DES_LONG ti[2];
+ unsigned char *iv;
- if (num > 64) return;
- if (num > 32)
- {
- mask0=0xffffffffL;
- if (num >= 64)
- mask1=mask0;
- else
- mask1=(1L<<(num-32))-1;
- }
- else
- {
- if (num == 32)
- mask0=0xffffffffL;
- else
- mask0=(1L<<num)-1;
- mask1=0x00000000L;
- }
+ if (num > 64)
+ return;
+ if (num > 32) {
+ mask0 = 0xffffffffL;
+ if (num >= 64)
+ mask1 = mask0;
+ else
+ mask1 = (1L << (num - 32)) - 1;
+ } else {
+ if (num == 32)
+ mask0 = 0xffffffffL;
+ else
+ mask0 = (1L << num) - 1;
+ mask1 = 0x00000000L;
+ }
- iv = &(*ivec)[0];
- c2l(iv,v0);
- c2l(iv,v1);
- ti[0]=v0;
- ti[1]=v1;
- while (l-- > 0)
- {
- ti[0]=v0;
- ti[1]=v1;
- DES_encrypt1((DES_LONG *)ti,schedule,DES_ENCRYPT);
- vv0=ti[0];
- vv1=ti[1];
- c2ln(in,d0,d1,n);
- in+=n;
- d0=(d0^vv0)&mask0;
- d1=(d1^vv1)&mask1;
- l2cn(d0,d1,out,n);
- out+=n;
+ iv = &(*ivec)[0];
+ c2l(iv, v0);
+ c2l(iv, v1);
+ ti[0] = v0;
+ ti[1] = v1;
+ while (l-- > 0) {
+ ti[0] = v0;
+ ti[1] = v1;
+ DES_encrypt1((DES_LONG *)ti, schedule, DES_ENCRYPT);
+ vv0 = ti[0];
+ vv1 = ti[1];
+ c2ln(in, d0, d1, n);
+ in += n;
+ d0 = (d0 ^ vv0) & mask0;
+ d1 = (d1 ^ vv1) & mask1;
+ l2cn(d0, d1, out, n);
+ out += n;
- if (num == 32)
- { v0=v1; v1=vv0; }
- else if (num == 64)
- { v0=vv0; v1=vv1; }
- else if (num > 32) /* && num != 64 */
- {
- v0=((v1>>(num-32))|(vv0<<(64-num)))&0xffffffffL;
- v1=((vv0>>(num-32))|(vv1<<(64-num)))&0xffffffffL;
- }
- else /* num < 32 */
- {
- v0=((v0>>num)|(v1<<(32-num)))&0xffffffffL;
- v1=((v1>>num)|(vv0<<(32-num)))&0xffffffffL;
- }
- }
- iv = &(*ivec)[0];
- l2c(v0,iv);
- l2c(v1,iv);
- v0=v1=d0=d1=ti[0]=ti[1]=vv0=vv1=0;
- }
+ if (num == 32) {
+ v0 = v1;
+ v1 = vv0;
+ } else if (num == 64) {
+ v0 = vv0;
+ v1 = vv1;
+ } else if (num > 32) { /* && num != 64 */
+ v0 = ((v1 >> (num - 32)) | (vv0 << (64 - num))) & 0xffffffffL;
+ v1 = ((vv0 >> (num - 32)) | (vv1 << (64 - num))) & 0xffffffffL;
+ } else { /* num < 32 */
+ v0 = ((v0 >> num) | (v1 << (32 - num))) & 0xffffffffL;
+ v1 = ((v1 >> num) | (vv0 << (32 - num))) & 0xffffffffL;
+ }
+ }
+ iv = &(*ivec)[0];
+ l2c(v0, iv);
+ l2c(v1, iv);
+ v0 = v1 = d0 = d1 = ti[0] = ti[1] = vv0 = vv1 = 0;
+}