diff options
Diffstat (limited to 'openssl/crypto/cast/c_cfb64.c')
| -rw-r--r-- | openssl/crypto/cast/c_cfb64.c | 126 |
1 files changed, 64 insertions, 62 deletions
diff --git a/openssl/crypto/cast/c_cfb64.c b/openssl/crypto/cast/c_cfb64.c index dcec13a20..f2f16e5d7 100644 --- a/openssl/crypto/cast/c_cfb64.c +++ b/openssl/crypto/cast/c_cfb64.c @@ -5,21 +5,21 @@ * 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: @@ -34,10 +34,10 @@ * 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 + * 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 @@ -49,7 +49,7 @@ * 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 @@ -59,63 +59,65 @@ #include <openssl/cast.h> #include "cast_lcl.h" -/* The input and output encrypted as though 64bit cfb mode is being - * used. The extra state information to record how much of the - * 64bit block we have used is contained in *num; +/* + * The input and output encrypted as though 64bit cfb mode is being used. + * The extra state information to record how much of the 64bit block we have + * used is contained in *num; */ void CAST_cfb64_encrypt(const unsigned char *in, unsigned char *out, - long length, const CAST_KEY *schedule, unsigned char *ivec, - int *num, int enc) - { - register CAST_LONG v0,v1,t; - register int n= *num; - register long l=length; - CAST_LONG ti[2]; - unsigned char *iv,c,cc; + long length, const CAST_KEY *schedule, + unsigned char *ivec, int *num, int enc) +{ + register CAST_LONG v0, v1, t; + register int n = *num; + register long l = length; + CAST_LONG ti[2]; + unsigned char *iv, c, cc; - iv=ivec; - if (enc) - { - while (l--) - { - if (n == 0) - { - n2l(iv,v0); ti[0]=v0; - n2l(iv,v1); ti[1]=v1; - CAST_encrypt((CAST_LONG *)ti,schedule); - iv=ivec; - t=ti[0]; l2n(t,iv); - t=ti[1]; l2n(t,iv); - iv=ivec; - } - c= *(in++)^iv[n]; - *(out++)=c; - iv[n]=c; - n=(n+1)&0x07; - } - } - else - { - while (l--) - { - if (n == 0) - { - n2l(iv,v0); ti[0]=v0; - n2l(iv,v1); ti[1]=v1; - CAST_encrypt((CAST_LONG *)ti,schedule); - iv=ivec; - t=ti[0]; l2n(t,iv); - t=ti[1]; l2n(t,iv); - iv=ivec; - } - cc= *(in++); - c=iv[n]; - iv[n]=cc; - *(out++)=c^cc; - n=(n+1)&0x07; - } - } - v0=v1=ti[0]=ti[1]=t=c=cc=0; - *num=n; - } + iv = ivec; + if (enc) { + while (l--) { + if (n == 0) { + n2l(iv, v0); + ti[0] = v0; + n2l(iv, v1); + ti[1] = v1; + CAST_encrypt((CAST_LONG *)ti, schedule); + iv = ivec; + t = ti[0]; + l2n(t, iv); + t = ti[1]; + l2n(t, iv); + iv = ivec; + } + c = *(in++) ^ iv[n]; + *(out++) = c; + iv[n] = c; + n = (n + 1) & 0x07; + } + } else { + while (l--) { + if (n == 0) { + n2l(iv, v0); + ti[0] = v0; + n2l(iv, v1); + ti[1] = v1; + CAST_encrypt((CAST_LONG *)ti, schedule); + iv = ivec; + t = ti[0]; + l2n(t, iv); + t = ti[1]; + l2n(t, iv); + iv = ivec; + } + cc = *(in++); + c = iv[n]; + iv[n] = cc; + *(out++) = c ^ cc; + n = (n + 1) & 0x07; + } + } + v0 = v1 = ti[0] = ti[1] = t = c = cc = 0; + *num = n; +} |