diff options
Diffstat (limited to 'openssl/crypto/idea/i_skey.c')
| -rw-r--r-- | openssl/crypto/idea/i_skey.c | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/openssl/crypto/idea/i_skey.c b/openssl/crypto/idea/i_skey.c new file mode 100644 index 000000000..fa75b1446 --- /dev/null +++ b/openssl/crypto/idea/i_skey.c @@ -0,0 +1,174 @@ +/* crypto/idea/i_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/idea.h> +#include <openssl/crypto.h> +#ifdef OPENSSL_FIPS +#include <openssl/fips.h> +#endif + +#include "idea_lcl.h" + +static IDEA_INT inverse(unsigned int xin); + +#ifdef OPENSSL_FIPS +void idea_set_encrypt_key(const unsigned char *key, IDEA_KEY_SCHEDULE *ks) + { + if (FIPS_mode()) + FIPS_BAD_ABORT(IDEA) + private_idea_set_encrypt_key(key, ks); + } +void private_idea_set_encrypt_key(const unsigned char *key, + IDEA_KEY_SCHEDULE *ks) +#else +void idea_set_encrypt_key(const unsigned char *key, IDEA_KEY_SCHEDULE *ks) +#endif + { + int i; + register IDEA_INT *kt,*kf,r0,r1,r2; + + kt= &(ks->data[0][0]); + n2s(key,kt[0]); n2s(key,kt[1]); n2s(key,kt[2]); n2s(key,kt[3]); + n2s(key,kt[4]); n2s(key,kt[5]); n2s(key,kt[6]); n2s(key,kt[7]); + + kf=kt; + kt+=8; + for (i=0; i<6; i++) + { + r2= kf[1]; + r1= kf[2]; + *(kt++)= ((r2<<9) | (r1>>7))&0xffff; + r0= kf[3]; + *(kt++)= ((r1<<9) | (r0>>7))&0xffff; + r1= kf[4]; + *(kt++)= ((r0<<9) | (r1>>7))&0xffff; + r0= kf[5]; + *(kt++)= ((r1<<9) | (r0>>7))&0xffff; + r1= kf[6]; + *(kt++)= ((r0<<9) | (r1>>7))&0xffff; + r0= kf[7]; + *(kt++)= ((r1<<9) | (r0>>7))&0xffff; + r1= kf[0]; + if (i >= 5) break; + *(kt++)= ((r0<<9) | (r1>>7))&0xffff; + *(kt++)= ((r1<<9) | (r2>>7))&0xffff; + kf+=8; + } + } + +void idea_set_decrypt_key(const IDEA_KEY_SCHEDULE *ek, IDEA_KEY_SCHEDULE *dk) + { + int r; + register IDEA_INT *tp,t; + const IDEA_INT *fp; + + tp= &(dk->data[0][0]); + fp= &(ek->data[8][0]); + for (r=0; r<9; r++) + { + *(tp++)=inverse(fp[0]); + *(tp++)=((int)(0x10000L-fp[2])&0xffff); + *(tp++)=((int)(0x10000L-fp[1])&0xffff); + *(tp++)=inverse(fp[3]); + if (r == 8) break; + fp-=6; + *(tp++)=fp[4]; + *(tp++)=fp[5]; + } + + tp= &(dk->data[0][0]); + t=tp[1]; + tp[1]=tp[2]; + tp[2]=t; + + t=tp[49]; + tp[49]=tp[50]; + tp[50]=t; + } + +/* taken directly from the 'paper' I'll have a look at it later */ +static IDEA_INT inverse(unsigned int xin) + { + long n1,n2,q,r,b1,b2,t; + + if (xin == 0) + b2=0; + else + { + n1=0x10001; + n2=xin; + b2=1; + b1=0; + + do { + r=(n1%n2); + q=(n1-r)/n2; + if (r == 0) + { if (b2 < 0) b2=0x10001+b2; } + else + { + n1=n2; + n2=r; + t=b2; + b2=b1-q*b2; + b1=t; + } + } while (r != 0); + } + return((IDEA_INT)b2); + } |