diff options
Diffstat (limited to 'crypto/libdes/ofb_enc.c')
| -rw-r--r-- | crypto/libdes/ofb_enc.c | 54 |
1 files changed, 33 insertions, 21 deletions
diff --git a/crypto/libdes/ofb_enc.c b/crypto/libdes/ofb_enc.c index d0506100d82f..a8f425a575a1 100644 --- a/crypto/libdes/ofb_enc.c +++ b/crypto/libdes/ofb_enc.c @@ -1,9 +1,9 @@ /* crypto/des/ofb_enc.c */ -/* Copyright (C) 1995-1997 Eric Young (eay@mincom.oz.au) +/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written - * by Eric Young (eay@mincom.oz.au). + * 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 @@ -11,7 +11,7 @@ * 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@mincom.oz.au). + * 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. @@ -31,12 +31,12 @@ * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * "This product includes cryptographic software written by - * Eric Young (eay@mincom.oz.au)" + * 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 * the apps directory (application code) you must include an acknowledgement: - * "This product includes software written by Tim Hudson (tjh@mincom.oz.au)" + * "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 @@ -64,15 +64,10 @@ * 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; @@ -94,29 +89,46 @@ des_cblock (*ivec); 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) { + ti[0]=v0; + ti[1]=v1; des_encrypt((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; } |