pigweed / third_party / boringssl / boringssl / 17cf2cb1d226b0ba2401304242df7ddd3b6f1ff2 / . / decrepit / des / cfb64ede.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 <string.h> | |

#include <openssl/des.h> | |

#include "../../crypto/des/internal.h" | |

#include "../../crypto/internal.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; */ | |

void DES_ede3_cfb64_encrypt(const uint8_t *in, uint8_t *out, | |

long length, DES_key_schedule *ks1, | |

DES_key_schedule *ks2, DES_key_schedule *ks3, | |

DES_cblock *ivec, int *num, int enc) { | |

uint32_t v0, v1; | |

long l = length; | |

int n = *num; | |

uint32_t ti[2]; | |

uint8_t *iv, c, cc; | |

iv = ivec->bytes; | |

if (enc) { | |

while (l--) { | |

if (n == 0) { | |

c2l(iv, v0); | |

c2l(iv, v1); | |

ti[0] = v0; | |

ti[1] = v1; | |

DES_encrypt3(ti, ks1, ks2, ks3); | |

v0 = ti[0]; | |

v1 = ti[1]; | |

iv = ivec->bytes; | |

l2c(v0, iv); | |

l2c(v1, iv); | |

iv = ivec->bytes; | |

} | |

c = *(in++) ^ iv[n]; | |

*(out++) = c; | |

iv[n] = c; | |

n = (n + 1) & 0x07; | |

} | |

} else { | |

while (l--) { | |

if (n == 0) { | |

c2l(iv, v0); | |

c2l(iv, v1); | |

ti[0] = v0; | |

ti[1] = v1; | |

DES_encrypt3(ti, ks1, ks2, ks3); | |

v0 = ti[0]; | |

v1 = ti[1]; | |

iv = ivec->bytes; | |

l2c(v0, iv); | |

l2c(v1, iv); | |

iv = ivec->bytes; | |

} | |

cc = *(in++); | |

c = iv[n]; | |

iv[n] = cc; | |

*(out++) = c ^ cc; | |

n = (n + 1) & 0x07; | |

} | |

} | |

v0 = v1 = ti[0] = ti[1] = c = cc = 0; | |

*num = n; | |

} | |

/* This is compatible with the single key CFB-r for DES, even thought that's | |

* not what EVP needs. */ | |

void DES_ede3_cfb_encrypt(const uint8_t *in, uint8_t *out, int numbits, | |

long length, DES_key_schedule *ks1, | |

DES_key_schedule *ks2, DES_key_schedule *ks3, | |

DES_cblock *ivec, int enc) { | |

uint32_t d0, d1, v0, v1; | |

unsigned long l = length, n = ((unsigned int)numbits + 7) / 8; | |

int num = numbits, i; | |

uint32_t ti[2]; | |

uint8_t *iv; | |

uint8_t ovec[16]; | |

if (num > 64) { | |

return; | |

}; | |

iv = ivec->bytes; | |

c2l(iv, v0); | |

c2l(iv, v1); | |

if (enc) { | |

while (l >= n) { | |

l -= n; | |

ti[0] = v0; | |

ti[1] = v1; | |

DES_encrypt3(ti, ks1, ks2, ks3); | |

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 (num == 32) { | |

v0 = v1; | |

v1 = d0; | |

} else if (num == 64) { | |

v0 = d0; | |

v1 = d1; | |

} else { | |

iv = &ovec[0]; | |

l2c(v0, iv); | |

l2c(v1, iv); | |

l2c(d0, iv); | |

l2c(d1, iv); | |

/* shift ovec left most of the bits... */ | |

OPENSSL_memmove(ovec, ovec + num / 8, 8 + (num % 8 ? 1 : 0)); | |

/* now the remaining bits */ | |

if (num % 8 != 0) { | |

for (i = 0; i < 8; ++i) { | |

ovec[i] <<= num % 8; | |

ovec[i] |= ovec[i + 1] >> (8 - num % 8); | |

} | |

} | |

iv = &ovec[0]; | |

c2l(iv, v0); | |

c2l(iv, v1); | |

} | |

} | |

} else { | |

while (l >= n) { | |

l -= n; | |

ti[0] = v0; | |

ti[1] = v1; | |

DES_encrypt3(ti, ks1, ks2, ks3); | |

c2ln(in, d0, d1, n); | |

in += n; | |

/* 30-08-94 - eay - changed because l>>32 and l<<32 are bad under | |

* gcc :-( */ | |

if (num == 32) { | |

v0 = v1; | |

v1 = d0; | |

} else if (num == 64) { | |

v0 = d0; | |

v1 = d1; | |

} else { | |

iv = &ovec[0]; | |

l2c(v0, iv); | |

l2c(v1, iv); | |

l2c(d0, iv); | |

l2c(d1, iv); | |

/* shift ovec left most of the bits... */ | |

OPENSSL_memmove(ovec, ovec + num / 8, 8 + (num % 8 ? 1 : 0)); | |

/* now the remaining bits */ | |

if (num % 8 != 0) { | |

for (i = 0; i < 8; ++i) { | |

ovec[i] <<= num % 8; | |

ovec[i] |= ovec[i + 1] >> (8 - num % 8); | |

} | |

} | |

iv = &ovec[0]; | |

c2l(iv, v0); | |

c2l(iv, v1); | |

} | |

d0 ^= ti[0]; | |

d1 ^= ti[1]; | |

l2cn(d0, d1, out, n); | |

out += n; | |

} | |

} | |

iv = ivec->bytes; | |

l2c(v0, iv); | |

l2c(v1, iv); | |

v0 = v1 = d0 = d1 = ti[0] = ti[1] = 0; | |

} |