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Diffstat (limited to 'crypto/idea/i_ofb64.c')
| -rw-r--r-- | crypto/idea/i_ofb64.c | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/crypto/idea/i_ofb64.c b/crypto/idea/i_ofb64.c new file mode 100644 index 0000000000..43a9584a37 --- /dev/null +++ b/crypto/idea/i_ofb64.c @@ -0,0 +1,115 @@ +/* crypto/idea/i_ofb64.c */ +/* Copyright (C) 1995-1997 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 "idea.h" +#include "idea_lcl.h" + +/* The input and output encrypted as though 64bit ofb mode is being + * used. The extra state information to record how much of the + * 64bit block we have used is contained in *num; + */ +void idea_ofb64_encrypt(in, out, length, schedule, ivec, num) +unsigned char *in; +unsigned char *out; +long length; +IDEA_KEY_SCHEDULE *schedule; +unsigned char *ivec; +int *num; + { + register unsigned long v0,v1,t; + register int n= *num; + register long l=length; + unsigned char d[8]; + register char *dp; + unsigned long ti[2]; + unsigned char *iv; + int save=0; + + iv=(unsigned char *)ivec; + n2l(iv,v0); + n2l(iv,v1); + ti[0]=v0; + ti[1]=v1; + dp=(char *)d; + l2n(v0,dp); + l2n(v1,dp); + while (l--) + { + if (n == 0) + { + idea_encrypt((unsigned long *)ti,schedule); + dp=(char *)d; + t=ti[0]; l2n(t,dp); + t=ti[1]; l2n(t,dp); + save++; + } + *(out++)= *(in++)^d[n]; + n=(n+1)&0x07; + } + if (save) + { + v0=ti[0]; + v1=ti[1]; + iv=(unsigned char *)ivec; + l2n(v0,iv); + l2n(v1,iv); + } + t=v0=v1=ti[0]=ti[1]=0; + *num=n; + } + |