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Diffstat (limited to 'lib/libdes/pcbc_enc.c')
| -rw-r--r-- | lib/libdes/pcbc_enc.c | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/lib/libdes/pcbc_enc.c b/lib/libdes/pcbc_enc.c new file mode 100644 index 00000000000..cb2e785cfb5 --- /dev/null +++ b/lib/libdes/pcbc_enc.c @@ -0,0 +1,126 @@ +/* crypto/des/pcbc_enc.c */ +/* Copyright (C) 1995-1997 Eric Young (eay@mincom.oz.au) + * All rights reserved. + * + * This package is an SSL implementation written + * by Eric Young (eay@mincom.oz.au). + * 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@mincom.oz.au). + * + * 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: + * 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 cryptographic software written by + * Eric Young (eay@mincom.oz.au)" + * 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 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" + +void des_pcbc_encrypt(input, output, length, schedule, ivec, encrypt) +des_cblock (*input); +des_cblock (*output); +long length; +des_key_schedule schedule; +des_cblock (*ivec); +int encrypt; + { + register DES_LONG sin0,sin1,xor0,xor1,tout0,tout1; + DES_LONG tin[2]; + unsigned char *in,*out,*iv; + + in=(unsigned char *)input; + out=(unsigned char *)output; + iv=(unsigned char *)ivec; + + if (encrypt) + { + c2l(iv,xor0); + c2l(iv,xor1); + for (; length>0; length-=8) + { + if (length >= 8) + { + c2l(in,sin0); + c2l(in,sin1); + } + else + c2ln(in,sin0,sin1,length); + tin[0]=sin0^xor0; + tin[1]=sin1^xor1; + des_encrypt((DES_LONG *)tin,schedule,DES_ENCRYPT); + tout0=tin[0]; + tout1=tin[1]; + xor0=sin0^tout0; + xor1=sin1^tout1; + l2c(tout0,out); + l2c(tout1,out); + } + } + else + { + c2l(iv,xor0); c2l(iv,xor1); + for (; length>0; length-=8) + { + c2l(in,sin0); + c2l(in,sin1); + tin[0]=sin0; + tin[1]=sin1; + des_encrypt((DES_LONG *)tin,schedule,DES_DECRYPT); + tout0=tin[0]^xor0; + tout1=tin[1]^xor1; + if (length >= 8) + { + l2c(tout0,out); + l2c(tout1,out); + } + else + l2cn(tout0,tout1,out,length); + xor0=tout0^sin0; + xor1=tout1^sin1; + } + } + tin[0]=tin[1]=0; + sin0=sin1=xor0=xor1=tout0=tout1=0; + } |