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Diffstat (limited to 'secure/lib/libdes/cfb64ede.c')
| -rw-r--r-- | secure/lib/libdes/cfb64ede.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/secure/lib/libdes/cfb64ede.c b/secure/lib/libdes/cfb64ede.c new file mode 100644 index 0000000..93af817 --- /dev/null +++ b/secure/lib/libdes/cfb64ede.c @@ -0,0 +1,152 @@ +/* lib/des/cfb64ede.c */ +/* Copyright (C) 1995 Eric Young (eay@mincom.oz.au) + * All rights reserved. + * + * This file is part of an SSL implementation written + * by Eric Young (eay@mincom.oz.au). + * The implementation was written so as to conform with Netscapes SSL + * specification. This library and applications are + * FREE FOR COMMERCIAL AND NON-COMMERCIAL USE + * as long as the following conditions are aheared to. + * + * Copyright remains Eric Young's, and as such any Copyright notices in + * the code are not to be removed. If this code is used in a product, + * Eric Young should be given attribution as the author of the parts 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: + * 1. Redistributions of source code must retain the copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by Eric Young (eay@mincom.oz.au) + * + * 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 + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * 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 + * [including the GNU Public Licence.] + */ + +#include "des_locl.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; + */ + +void des_ede3_cfb64_encrypt(in, out, length, ks1,ks2,ks3, ivec, num, encrypt) +unsigned char *in; +unsigned char *out; +long length; +des_key_schedule ks1,ks2,ks3; +des_cblock (*ivec); +int *num; +int encrypt; + { + register unsigned long v0,v1; + register long l=length,n=*num; + unsigned long ti[2]; + unsigned char *iv,c,cc; + + iv=(unsigned char *)ivec; + if (encrypt) + { + while (l--) + { + if (n == 0) + { + c2l(iv,v0); + c2l(iv,v1); + + IP(v0,v1); + + ti[0]=v0; + ti[1]=v1; + des_encrypt2((unsigned long *)ti,ks1,DES_ENCRYPT); + des_encrypt2((unsigned long *)ti,ks2,DES_DECRYPT); + des_encrypt2((unsigned long *)ti,ks3,DES_ENCRYPT); + v0=ti[0]; + v1=ti[1]; + + FP(v1,v0); + + iv=(unsigned char *)ivec; + l2c(v0,iv); + l2c(v1,iv); + iv=(unsigned char *)ivec; + } + c= *(in++)^iv[n]; + *(out++)=c; + iv[n]=c; + n=(n+1)&0x07; + } + } + else + { + while (l--) + { + if (n == 0) + { + c2l(iv,v0); + c2l(iv,v1); + + IP(v0,v1); + + ti[0]=v0; + ti[1]=v1; + des_encrypt2((unsigned long *)ti,ks1,DES_ENCRYPT); + des_encrypt2((unsigned long *)ti,ks2,DES_DECRYPT); + des_encrypt2((unsigned long *)ti,ks3,DES_ENCRYPT); + + v0=ti[0]; + v1=ti[1]; + + FP(v1,v0); + + iv=(unsigned char *)ivec; + l2c(v0,iv); + l2c(v1,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]=c=cc=0; + *num=n; + } + +#ifdef undef /* MACRO */ +void des_ede2_cfb64_encrypt(in, out, length, ks1,ks2, ivec, num, encrypt) +unsigned char *in; +unsigned char *out; +long length; +des_key_schedule ks1,ks2; +des_cblock (*ivec); +int *num; +int encrypt; + { + des_ede3_cfb64_encrypt(in,out,length,ks1,ks2,ks1,ivec,num,encrypt); + } +#endif |
