8b00b7b8b3
Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/7774)
175 lines
4.5 KiB
C
175 lines
4.5 KiB
C
/*
|
|
* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
|
|
*
|
|
* Licensed under the Apache License 2.0 (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 <openssl/blowfish.h>
|
|
#include "bf_locl.h"
|
|
|
|
/*
|
|
* Blowfish as implemented from 'Blowfish: Springer-Verlag paper' (From
|
|
* LECTURE NOTES IN COMPUTER SCIENCE 809, FAST SOFTWARE ENCRYPTION, CAMBRIDGE
|
|
* SECURITY WORKSHOP, CAMBRIDGE, U.K., DECEMBER 9-11, 1993)
|
|
*/
|
|
|
|
#if (BF_ROUNDS != 16) && (BF_ROUNDS != 20)
|
|
# error If you set BF_ROUNDS to some value other than 16 or 20, you will have \
|
|
to modify the code.
|
|
#endif
|
|
|
|
void BF_encrypt(BF_LONG *data, const BF_KEY *key)
|
|
{
|
|
register BF_LONG l, r;
|
|
register const BF_LONG *p, *s;
|
|
|
|
p = key->P;
|
|
s = &(key->S[0]);
|
|
l = data[0];
|
|
r = data[1];
|
|
|
|
l ^= p[0];
|
|
BF_ENC(r, l, s, p[1]);
|
|
BF_ENC(l, r, s, p[2]);
|
|
BF_ENC(r, l, s, p[3]);
|
|
BF_ENC(l, r, s, p[4]);
|
|
BF_ENC(r, l, s, p[5]);
|
|
BF_ENC(l, r, s, p[6]);
|
|
BF_ENC(r, l, s, p[7]);
|
|
BF_ENC(l, r, s, p[8]);
|
|
BF_ENC(r, l, s, p[9]);
|
|
BF_ENC(l, r, s, p[10]);
|
|
BF_ENC(r, l, s, p[11]);
|
|
BF_ENC(l, r, s, p[12]);
|
|
BF_ENC(r, l, s, p[13]);
|
|
BF_ENC(l, r, s, p[14]);
|
|
BF_ENC(r, l, s, p[15]);
|
|
BF_ENC(l, r, s, p[16]);
|
|
# if BF_ROUNDS == 20
|
|
BF_ENC(r, l, s, p[17]);
|
|
BF_ENC(l, r, s, p[18]);
|
|
BF_ENC(r, l, s, p[19]);
|
|
BF_ENC(l, r, s, p[20]);
|
|
# endif
|
|
r ^= p[BF_ROUNDS + 1];
|
|
|
|
data[1] = l & 0xffffffffU;
|
|
data[0] = r & 0xffffffffU;
|
|
}
|
|
|
|
void BF_decrypt(BF_LONG *data, const BF_KEY *key)
|
|
{
|
|
register BF_LONG l, r;
|
|
register const BF_LONG *p, *s;
|
|
|
|
p = key->P;
|
|
s = &(key->S[0]);
|
|
l = data[0];
|
|
r = data[1];
|
|
|
|
l ^= p[BF_ROUNDS + 1];
|
|
# if BF_ROUNDS == 20
|
|
BF_ENC(r, l, s, p[20]);
|
|
BF_ENC(l, r, s, p[19]);
|
|
BF_ENC(r, l, s, p[18]);
|
|
BF_ENC(l, r, s, p[17]);
|
|
# endif
|
|
BF_ENC(r, l, s, p[16]);
|
|
BF_ENC(l, r, s, p[15]);
|
|
BF_ENC(r, l, s, p[14]);
|
|
BF_ENC(l, r, s, p[13]);
|
|
BF_ENC(r, l, s, p[12]);
|
|
BF_ENC(l, r, s, p[11]);
|
|
BF_ENC(r, l, s, p[10]);
|
|
BF_ENC(l, r, s, p[9]);
|
|
BF_ENC(r, l, s, p[8]);
|
|
BF_ENC(l, r, s, p[7]);
|
|
BF_ENC(r, l, s, p[6]);
|
|
BF_ENC(l, r, s, p[5]);
|
|
BF_ENC(r, l, s, p[4]);
|
|
BF_ENC(l, r, s, p[3]);
|
|
BF_ENC(r, l, s, p[2]);
|
|
BF_ENC(l, r, s, p[1]);
|
|
r ^= p[0];
|
|
|
|
data[1] = l & 0xffffffffU;
|
|
data[0] = r & 0xffffffffU;
|
|
}
|
|
|
|
void BF_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
|
|
const BF_KEY *schedule, unsigned char *ivec, int encrypt)
|
|
{
|
|
register BF_LONG tin0, tin1;
|
|
register BF_LONG tout0, tout1, xor0, xor1;
|
|
register long l = length;
|
|
BF_LONG tin[2];
|
|
|
|
if (encrypt) {
|
|
n2l(ivec, tout0);
|
|
n2l(ivec, tout1);
|
|
ivec -= 8;
|
|
for (l -= 8; l >= 0; l -= 8) {
|
|
n2l(in, tin0);
|
|
n2l(in, tin1);
|
|
tin0 ^= tout0;
|
|
tin1 ^= tout1;
|
|
tin[0] = tin0;
|
|
tin[1] = tin1;
|
|
BF_encrypt(tin, schedule);
|
|
tout0 = tin[0];
|
|
tout1 = tin[1];
|
|
l2n(tout0, out);
|
|
l2n(tout1, out);
|
|
}
|
|
if (l != -8) {
|
|
n2ln(in, tin0, tin1, l + 8);
|
|
tin0 ^= tout0;
|
|
tin1 ^= tout1;
|
|
tin[0] = tin0;
|
|
tin[1] = tin1;
|
|
BF_encrypt(tin, schedule);
|
|
tout0 = tin[0];
|
|
tout1 = tin[1];
|
|
l2n(tout0, out);
|
|
l2n(tout1, out);
|
|
}
|
|
l2n(tout0, ivec);
|
|
l2n(tout1, ivec);
|
|
} else {
|
|
n2l(ivec, xor0);
|
|
n2l(ivec, xor1);
|
|
ivec -= 8;
|
|
for (l -= 8; l >= 0; l -= 8) {
|
|
n2l(in, tin0);
|
|
n2l(in, tin1);
|
|
tin[0] = tin0;
|
|
tin[1] = tin1;
|
|
BF_decrypt(tin, schedule);
|
|
tout0 = tin[0] ^ xor0;
|
|
tout1 = tin[1] ^ xor1;
|
|
l2n(tout0, out);
|
|
l2n(tout1, out);
|
|
xor0 = tin0;
|
|
xor1 = tin1;
|
|
}
|
|
if (l != -8) {
|
|
n2l(in, tin0);
|
|
n2l(in, tin1);
|
|
tin[0] = tin0;
|
|
tin[1] = tin1;
|
|
BF_decrypt(tin, schedule);
|
|
tout0 = tin[0] ^ xor0;
|
|
tout1 = tin[1] ^ xor1;
|
|
l2nn(tout0, tout1, out, l + 8);
|
|
xor0 = tin0;
|
|
xor1 = tin1;
|
|
}
|
|
l2n(xor0, ivec);
|
|
l2n(xor1, ivec);
|
|
}
|
|
tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
|
|
tin[0] = tin[1] = 0;
|
|
}
|