/* crypto/des/ofb_enc.c */
-/* Copyright (C) 1995-1997 Eric Young (eay@cryptsoft.com)
+/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* the second. The second 12 bits will come from the 3rd and half the 4th
* byte.
*/
-void des_ofb_encrypt(in, out, numbits, length, schedule, ivec)
-unsigned char *in;
-unsigned char *out;
-int numbits;
-long length;
-des_key_schedule schedule;
-des_cblock (*ivec);
+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,v0,v1,n=(numbits+7)/8;
+ 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;
mask0=0xffffffffL;
else
mask0=(1L<<num)-1;
- mask1=0x00000000;
+ mask1=0x00000000L;
}
- iv=(unsigned char *)ivec;
+ iv = &(*ivec)[0];
c2l(iv,v0);
c2l(iv,v1);
ti[0]=v0;
ti[1]=v1;
while (l-- > 0)
{
- des_encrypt((DES_LONG *)ti,schedule,DES_ENCRYPT);
+ 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^ti[0])&mask0;
- d1=(d1^ti[1])&mask1;
+ 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;
+ }
}
- v0=ti[0];
- v1=ti[1];
- iv=(unsigned char *)ivec;
+ iv = &(*ivec)[0];
l2c(v0,iv);
l2c(v1,iv);
- v0=v1=d0=d1=ti[0]=ti[1]=0;
+ v0=v1=d0=d1=ti[0]=ti[1]=vv0=vv1=0;
}