diff options
Diffstat (limited to 'openssl/crypto/cast/c_enc.c')
| -rw-r--r-- | openssl/crypto/cast/c_enc.c | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/openssl/crypto/cast/c_enc.c b/openssl/crypto/cast/c_enc.c new file mode 100644 index 0000000..6e1d50f --- /dev/null +++ b/openssl/crypto/cast/c_enc.c @@ -0,0 +1,200 @@ +/* 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, const CAST_KEY *key) +{ + register CAST_LONG l, r, t; + const register CAST_LONG *k; + + 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, const CAST_KEY *key) +{ + register CAST_LONG l, r, t; + const register CAST_LONG *k; + + 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, const 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; +} |