diff options
Diffstat (limited to 'openssl/crypto/rc5/rc5_skey.c')
| -rw-r--r-- | openssl/crypto/rc5/rc5_skey.c | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/openssl/crypto/rc5/rc5_skey.c b/openssl/crypto/rc5/rc5_skey.c new file mode 100644 index 0000000..5dd4a52 --- /dev/null +++ b/openssl/crypto/rc5/rc5_skey.c @@ -0,0 +1,110 @@ +/* crypto/rc5/rc5_skey.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/rc5.h> +#include "rc5_locl.h" + +void RC5_32_set_key(RC5_32_KEY *key, int len, const unsigned char *data, + int rounds) +{ + RC5_32_INT L[64], l, ll, A, B, *S, k; + int i, j, m, c, t, ii, jj; + + if ((rounds != RC5_16_ROUNDS) && + (rounds != RC5_12_ROUNDS) && (rounds != RC5_8_ROUNDS)) + rounds = RC5_16_ROUNDS; + + key->rounds = rounds; + S = &(key->data[0]); + j = 0; + for (i = 0; i <= (len - 8); i += 8) { + c2l(data, l); + L[j++] = l; + c2l(data, l); + L[j++] = l; + } + ii = len - i; + if (ii) { + k = len & 0x07; + c2ln(data, l, ll, k); + L[j + 0] = l; + L[j + 1] = ll; + } + + c = (len + 3) / 4; + t = (rounds + 1) * 2; + S[0] = RC5_32_P; + for (i = 1; i < t; i++) + S[i] = (S[i - 1] + RC5_32_Q) & RC5_32_MASK; + + j = (t > c) ? t : c; + j *= 3; + ii = jj = 0; + A = B = 0; + for (i = 0; i < j; i++) { + k = (S[ii] + A + B) & RC5_32_MASK; + A = S[ii] = ROTATE_l32(k, 3); + m = (int)(A + B); + k = (L[jj] + A + B) & RC5_32_MASK; + B = L[jj] = ROTATE_l32(k, m); + if (++ii >= t) + ii = 0; + if (++jj >= c) + jj = 0; + } +} |