diff options
Diffstat (limited to 'openssl/crypto/cast/c_enc.c')
| -rw-r--r-- | openssl/crypto/cast/c_enc.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/openssl/crypto/cast/c_enc.c b/openssl/crypto/cast/c_enc.c new file mode 100644 index 000000000..0fe2cffec --- /dev/null +++ b/openssl/crypto/cast/c_enc.c @@ -0,0 +1,207 @@ +/* crypto/cast/c_enc.c */ +/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) + * All rights reserved. + * + * 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: + * 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@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@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 + * 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 <openssl/cast.h> +#include "cast_lcl.h" + +void CAST_encrypt(CAST_LONG *data, CAST_KEY *key) + { + register CAST_LONG l,r,*k,t; + + k= &(key->data[0]); + l=data[0]; + r=data[1]; + + E_CAST( 0,k,l,r,+,^,-); + E_CAST( 1,k,r,l,^,-,+); + E_CAST( 2,k,l,r,-,+,^); + E_CAST( 3,k,r,l,+,^,-); + E_CAST( 4,k,l,r,^,-,+); + E_CAST( 5,k,r,l,-,+,^); + E_CAST( 6,k,l,r,+,^,-); + E_CAST( 7,k,r,l,^,-,+); + E_CAST( 8,k,l,r,-,+,^); + E_CAST( 9,k,r,l,+,^,-); + E_CAST(10,k,l,r,^,-,+); + E_CAST(11,k,r,l,-,+,^); + if(!key->short_key) + { + E_CAST(12,k,l,r,+,^,-); + E_CAST(13,k,r,l,^,-,+); + E_CAST(14,k,l,r,-,+,^); + E_CAST(15,k,r,l,+,^,-); + } + + data[1]=l&0xffffffffL; + data[0]=r&0xffffffffL; + } + +void CAST_decrypt(CAST_LONG *data, CAST_KEY *key) + { + register CAST_LONG l,r,*k,t; + + k= &(key->data[0]); + l=data[0]; + r=data[1]; + + if(!key->short_key) + { + E_CAST(15,k,l,r,+,^,-); + E_CAST(14,k,r,l,-,+,^); + E_CAST(13,k,l,r,^,-,+); + E_CAST(12,k,r,l,+,^,-); + } + E_CAST(11,k,l,r,-,+,^); + E_CAST(10,k,r,l,^,-,+); + E_CAST( 9,k,l,r,+,^,-); + E_CAST( 8,k,r,l,-,+,^); + E_CAST( 7,k,l,r,^,-,+); + E_CAST( 6,k,r,l,+,^,-); + E_CAST( 5,k,l,r,-,+,^); + E_CAST( 4,k,r,l,^,-,+); + E_CAST( 3,k,l,r,+,^,-); + E_CAST( 2,k,r,l,-,+,^); + E_CAST( 1,k,l,r,^,-,+); + E_CAST( 0,k,r,l,+,^,-); + + data[1]=l&0xffffffffL; + data[0]=r&0xffffffffL; + } + +void CAST_cbc_encrypt(const unsigned char *in, unsigned char *out, long length, + CAST_KEY *ks, unsigned char *iv, int enc) + { + register CAST_LONG tin0,tin1; + register CAST_LONG tout0,tout1,xor0,xor1; + register long l=length; + CAST_LONG tin[2]; + + if (enc) + { + n2l(iv,tout0); + n2l(iv,tout1); + iv-=8; + for (l-=8; l>=0; l-=8) + { + n2l(in,tin0); + n2l(in,tin1); + tin0^=tout0; + tin1^=tout1; + tin[0]=tin0; + tin[1]=tin1; + CAST_encrypt(tin,ks); + tout0=tin[0]; + tout1=tin[1]; + l2n(tout0,out); + l2n(tout1,out); + } + if (l != -8) + { + n2ln(in,tin0,tin1,l+8); + tin0^=tout0; + tin1^=tout1; + tin[0]=tin0; + tin[1]=tin1; + CAST_encrypt(tin,ks); + tout0=tin[0]; + tout1=tin[1]; + l2n(tout0,out); + l2n(tout1,out); + } + l2n(tout0,iv); + l2n(tout1,iv); + } + else + { + n2l(iv,xor0); + n2l(iv,xor1); + iv-=8; + for (l-=8; l>=0; l-=8) + { + n2l(in,tin0); + n2l(in,tin1); + tin[0]=tin0; + tin[1]=tin1; + CAST_decrypt(tin,ks); + tout0=tin[0]^xor0; + tout1=tin[1]^xor1; + l2n(tout0,out); + l2n(tout1,out); + xor0=tin0; + xor1=tin1; + } + if (l != -8) + { + n2l(in,tin0); + n2l(in,tin1); + tin[0]=tin0; + tin[1]=tin1; + CAST_decrypt(tin,ks); + tout0=tin[0]^xor0; + tout1=tin[1]^xor1; + l2nn(tout0,tout1,out,l+8); + xor0=tin0; + xor1=tin1; + } + l2n(xor0,iv); + l2n(xor1,iv); + } + tin0=tin1=tout0=tout1=xor0=xor1=0; + tin[0]=tin[1]=0; + } + |