diff options
Diffstat (limited to 'openssl-1.1.0h/crypto/des/cfb_enc.c')
| -rw-r--r-- | openssl-1.1.0h/crypto/des/cfb_enc.c | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/openssl-1.1.0h/crypto/des/cfb_enc.c b/openssl-1.1.0h/crypto/des/cfb_enc.c new file mode 100644 index 0000000..6c428ba --- /dev/null +++ b/openssl-1.1.0h/crypto/des/cfb_enc.c @@ -0,0 +1,150 @@ +/* + * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the OpenSSL license (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html + */ + +#include "e_os.h" +#include "des_locl.h" +#include <assert.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. + */ +/* + * Until Aug 1 2003 this function did not correctly implement CFB-r, so it + * will not be compatible with any encryption prior to that date. Ben. + */ +void DES_cfb_encrypt(const unsigned char *in, unsigned char *out, int numbits, + long length, DES_key_schedule *schedule, + DES_cblock *ivec, int enc) +{ + register DES_LONG d0, d1, v0, v1; + register unsigned long l = length; + register int num = numbits / 8, n = (numbits + 7) / 8, i, rem = + numbits % 8; + DES_LONG ti[2]; + unsigned char *iv; +#ifndef L_ENDIAN + unsigned char ovec[16]; +#else + unsigned int sh[4]; + unsigned char *ovec = (unsigned char *)sh; + + /* I kind of count that compiler optimizes away this assertioni, */ + assert(sizeof(sh[0]) == 4); /* as this holds true for all, */ + /* but 16-bit platforms... */ + +#endif + + if (numbits <= 0 || numbits > 64) + return; + iv = &(*ivec)[0]; + c2l(iv, v0); + c2l(iv, v1); + if (enc) { + while (l >= (unsigned long)n) { + l -= n; + ti[0] = v0; + ti[1] = v1; + DES_encrypt1((DES_LONG *)ti, schedule, DES_ENCRYPT); + c2ln(in, d0, d1, n); + in += n; + d0 ^= ti[0]; + d1 ^= ti[1]; + l2cn(d0, d1, out, n); + out += n; + /* + * 30-08-94 - eay - changed because l>>32 and l<<32 are bad under + * gcc :-( + */ + if (numbits == 32) { + v0 = v1; + v1 = d0; + } else if (numbits == 64) { + v0 = d0; + v1 = d1; + } else { +#ifndef L_ENDIAN + iv = &ovec[0]; + l2c(v0, iv); + l2c(v1, iv); + l2c(d0, iv); + l2c(d1, iv); +#else + sh[0] = v0, sh[1] = v1, sh[2] = d0, sh[3] = d1; +#endif + if (rem == 0) + memmove(ovec, ovec + num, 8); + else + for (i = 0; i < 8; ++i) + ovec[i] = ovec[i + num] << rem | + ovec[i + num + 1] >> (8 - rem); +#ifdef L_ENDIAN + v0 = sh[0], v1 = sh[1]; +#else + iv = &ovec[0]; + c2l(iv, v0); + c2l(iv, v1); +#endif + } + } + } else { + while (l >= (unsigned long)n) { + l -= n; + ti[0] = v0; + ti[1] = v1; + DES_encrypt1((DES_LONG *)ti, schedule, DES_ENCRYPT); + c2ln(in, d0, d1, n); + in += n; + /* + * 30-08-94 - eay - changed because l>>32 and l<<32 are bad under + * gcc :-( + */ + if (numbits == 32) { + v0 = v1; + v1 = d0; + } else if (numbits == 64) { + v0 = d0; + v1 = d1; + } else { +#ifndef L_ENDIAN + iv = &ovec[0]; + l2c(v0, iv); + l2c(v1, iv); + l2c(d0, iv); + l2c(d1, iv); +#else + sh[0] = v0, sh[1] = v1, sh[2] = d0, sh[3] = d1; +#endif + if (rem == 0) + memmove(ovec, ovec + num, 8); + else + for (i = 0; i < 8; ++i) + ovec[i] = ovec[i + num] << rem | + ovec[i + num + 1] >> (8 - rem); +#ifdef L_ENDIAN + v0 = sh[0], v1 = sh[1]; +#else + iv = &ovec[0]; + c2l(iv, v0); + c2l(iv, v1); +#endif + } + d0 ^= ti[0]; + d1 ^= ti[1]; + l2cn(d0, d1, out, n); + out += n; + } + } + iv = &(*ivec)[0]; + l2c(v0, iv); + l2c(v1, iv); + v0 = v1 = d0 = d1 = ti[0] = ti[1] = 0; +} |