diff options
Diffstat (limited to 'crypto/des/ofb_enc.c')
| -rw-r--r-- | crypto/des/ofb_enc.c | 146 |
1 files changed, 71 insertions, 75 deletions
diff --git a/crypto/des/ofb_enc.c b/crypto/des/ofb_enc.c index e887a3c6f4bd..02a787752ef3 100644 --- a/crypto/des/ofb_enc.c +++ b/crypto/des/ofb_enc.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 @@ -58,78 +58,74 @@ #include "des_locl.h" -/* The input and output are loaded in multiples of 8 bits. - * What this means is that if you hame numbits=12 and length=2 - * the first 12 bits will be retrieved from the first byte and half - * the second. The second 12 bits will come from the 3rd and half the 4th - * byte. +/* + * The input and output are loaded in multiples of 8 bits. What this means is + * that if you hame numbits=12 and length=2 the first 12 bits will be + * retrieved from the first byte and half the second. The second 12 bits + * will come from the 3rd and half the 4th byte. */ void DES_ofb_encrypt(const unsigned char *in, unsigned char *out, int numbits, - long length, DES_key_schedule *schedule, - DES_cblock *ivec) - { - register DES_LONG d0,d1,vv0,vv1,v0,v1,n=(numbits+7)/8; - register DES_LONG mask0,mask1; - register long l=length; - register int num=numbits; - DES_LONG ti[2]; - unsigned char *iv; + long length, DES_key_schedule *schedule, + DES_cblock *ivec) +{ + register DES_LONG d0, d1, vv0, vv1, v0, v1, n = (numbits + 7) / 8; + register DES_LONG mask0, mask1; + register long l = length; + register int num = numbits; + DES_LONG ti[2]; + unsigned char *iv; - if (num > 64) return; - if (num > 32) - { - mask0=0xffffffffL; - if (num >= 64) - mask1=mask0; - else - mask1=(1L<<(num-32))-1; - } - else - { - if (num == 32) - mask0=0xffffffffL; - else - mask0=(1L<<num)-1; - mask1=0x00000000L; - } + if (num > 64) + return; + if (num > 32) { + mask0 = 0xffffffffL; + if (num >= 64) + mask1 = mask0; + else + mask1 = (1L << (num - 32)) - 1; + } else { + if (num == 32) + mask0 = 0xffffffffL; + else + mask0 = (1L << num) - 1; + mask1 = 0x00000000L; + } - iv = &(*ivec)[0]; - c2l(iv,v0); - c2l(iv,v1); - ti[0]=v0; - ti[1]=v1; - while (l-- > 0) - { - ti[0]=v0; - ti[1]=v1; - DES_encrypt1((DES_LONG *)ti,schedule,DES_ENCRYPT); - vv0=ti[0]; - vv1=ti[1]; - c2ln(in,d0,d1,n); - in+=n; - d0=(d0^vv0)&mask0; - d1=(d1^vv1)&mask1; - l2cn(d0,d1,out,n); - out+=n; + iv = &(*ivec)[0]; + c2l(iv, v0); + c2l(iv, v1); + ti[0] = v0; + ti[1] = v1; + while (l-- > 0) { + ti[0] = v0; + ti[1] = v1; + DES_encrypt1((DES_LONG *)ti, schedule, DES_ENCRYPT); + vv0 = ti[0]; + vv1 = ti[1]; + c2ln(in, d0, d1, n); + in += n; + d0 = (d0 ^ vv0) & mask0; + d1 = (d1 ^ vv1) & mask1; + l2cn(d0, d1, out, n); + out += n; - if (num == 32) - { v0=v1; v1=vv0; } - else if (num == 64) - { v0=vv0; v1=vv1; } - else if (num > 32) /* && num != 64 */ - { - v0=((v1>>(num-32))|(vv0<<(64-num)))&0xffffffffL; - v1=((vv0>>(num-32))|(vv1<<(64-num)))&0xffffffffL; - } - else /* num < 32 */ - { - v0=((v0>>num)|(v1<<(32-num)))&0xffffffffL; - v1=((v1>>num)|(vv0<<(32-num)))&0xffffffffL; - } - } - iv = &(*ivec)[0]; - l2c(v0,iv); - l2c(v1,iv); - v0=v1=d0=d1=ti[0]=ti[1]=vv0=vv1=0; - } + if (num == 32) { + v0 = v1; + v1 = vv0; + } else if (num == 64) { + v0 = vv0; + v1 = vv1; + } else if (num > 32) { /* && num != 64 */ + v0 = ((v1 >> (num - 32)) | (vv0 << (64 - num))) & 0xffffffffL; + v1 = ((vv0 >> (num - 32)) | (vv1 << (64 - num))) & 0xffffffffL; + } else { /* num < 32 */ + v0 = ((v0 >> num) | (v1 << (32 - num))) & 0xffffffffL; + v1 = ((v1 >> num) | (vv0 << (32 - num))) & 0xffffffffL; + } + } + iv = &(*ivec)[0]; + l2c(v0, iv); + l2c(v1, iv); + v0 = v1 = d0 = d1 = ti[0] = ti[1] = vv0 = vv1 = 0; +} |