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boringssl/crypto/cipher/e_rc2.c
David Benjamin 9ecafa5c78 Shush some dead assignments. 
Appease clang scan-build a bit. I'm not sure it's actually worth silencing all
of them because some of them look like preserving invariants between local
variables, but some are clearly pointless or can be restructured slightly.

Change-Id: I0bc81e2589bb402ff3ef0182d7a8921e31b85052
Reviewed-on: https://boringssl-review.googlesource.com/2205
Reviewed-by: Adam Langley <agl@google.com>
2014-11-06 01:34:33 +00:00

421 lines
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C
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/* 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 <openssl/cipher.h>
#include <openssl/obj.h>
#include "internal.h"
#define c2l(c, l) \
(l = ((uint32_t)(*((c)++))), l |= ((uint32_t)(*((c)++))) << 8L, \
l |= ((uint32_t)(*((c)++))) << 16L, \
l |= ((uint32_t)(*((c)++))) << 24L)
#define c2ln(c, l1, l2, n) \
{ \
c += n; \
l1 = l2 = 0; \
switch (n) { \
case 8: \
l2 = ((uint32_t)(*(--(c)))) << 24L; \
case 7: \
l2 |= ((uint32_t)(*(--(c)))) << 16L; \
case 6: \
l2 |= ((uint32_t)(*(--(c)))) << 8L; \
case 5: \
l2 |= ((uint32_t)(*(--(c)))); \
case 4: \
l1 = ((uint32_t)(*(--(c)))) << 24L; \
case 3: \
l1 |= ((uint32_t)(*(--(c)))) << 16L; \
case 2: \
l1 |= ((uint32_t)(*(--(c)))) << 8L; \
case 1: \
l1 |= ((uint32_t)(*(--(c)))); \
} \
}
#define l2c(l, c) \
(*((c)++) = (uint8_t)(((l)) & 0xff), \
*((c)++) = (uint8_t)(((l) >> 8L) & 0xff), \
*((c)++) = (uint8_t)(((l) >> 16L) & 0xff), \
*((c)++) = (uint8_t)(((l) >> 24L) & 0xff))
#define l2cn(l1, l2, c, n) \
{ \
c += n; \
switch (n) { \
case 8: \
*(--(c)) = (uint8_t)(((l2) >> 24L) & 0xff); \
case 7: \
*(--(c)) = (uint8_t)(((l2) >> 16L) & 0xff); \
case 6: \
*(--(c)) = (uint8_t)(((l2) >> 8L) & 0xff); \
case 5: \
*(--(c)) = (uint8_t)(((l2)) & 0xff); \
case 4: \
*(--(c)) = (uint8_t)(((l1) >> 24L) & 0xff); \
case 3: \
*(--(c)) = (uint8_t)(((l1) >> 16L) & 0xff); \
case 2: \
*(--(c)) = (uint8_t)(((l1) >> 8L) & 0xff); \
case 1: \
*(--(c)) = (uint8_t)(((l1)) & 0xff); \
} \
}
typedef struct rc2_key_st { uint16_t data[64]; } RC2_KEY;
static void RC2_encrypt(uint32_t *d, RC2_KEY *key) {
int i, n;
uint16_t *p0, *p1;
uint16_t x0, x1, x2, x3, t;
uint32_t l;
l = d[0];
x0 = (uint16_t)l & 0xffff;
x1 = (uint16_t)(l >> 16L);
l = d[1];
x2 = (uint16_t)l & 0xffff;
x3 = (uint16_t)(l >> 16L);
n = 3;
i = 5;
p0 = p1 = &key->data[0];
for (;;) {
t = (x0 + (x1 & ~x3) + (x2 & x3) + *(p0++)) & 0xffff;
x0 = (t << 1) | (t >> 15);
t = (x1 + (x2 & ~x0) + (x3 & x0) + *(p0++)) & 0xffff;
x1 = (t << 2) | (t >> 14);
t = (x2 + (x3 & ~x1) + (x0 & x1) + *(p0++)) & 0xffff;
x2 = (t << 3) | (t >> 13);
t = (x3 + (x0 & ~x2) + (x1 & x2) + *(p0++)) & 0xffff;
x3 = (t << 5) | (t >> 11);
if (--i == 0) {
if (--n == 0) {
break;
}
i = (n == 2) ? 6 : 5;
x0 += p1[x3 & 0x3f];
x1 += p1[x0 & 0x3f];
x2 += p1[x1 & 0x3f];
x3 += p1[x2 & 0x3f];
}
}
d[0] = (uint32_t)(x0 & 0xffff) | ((uint32_t)(x1 & 0xffff) << 16L);
d[1] = (uint32_t)(x2 & 0xffff) | ((uint32_t)(x3 & 0xffff) << 16L);
}
static void RC2_decrypt(uint32_t *d, RC2_KEY *key) {
int i, n;
uint16_t *p0, *p1;
uint16_t x0, x1, x2, x3, t;
uint32_t l;
l = d[0];
x0 = (uint16_t)l & 0xffff;
x1 = (uint16_t)(l >> 16L);
l = d[1];
x2 = (uint16_t)l & 0xffff;
x3 = (uint16_t)(l >> 16L);
n = 3;
i = 5;
p0 = &key->data[63];
p1 = &key->data[0];
for (;;) {
t = ((x3 << 11) | (x3 >> 5)) & 0xffff;
x3 = (t - (x0 & ~x2) - (x1 & x2) - *(p0--)) & 0xffff;
t = ((x2 << 13) | (x2 >> 3)) & 0xffff;
x2 = (t - (x3 & ~x1) - (x0 & x1) - *(p0--)) & 0xffff;
t = ((x1 << 14) | (x1 >> 2)) & 0xffff;
x1 = (t - (x2 & ~x0) - (x3 & x0) - *(p0--)) & 0xffff;
t = ((x0 << 15) | (x0 >> 1)) & 0xffff;
x0 = (t - (x1 & ~x3) - (x2 & x3) - *(p0--)) & 0xffff;
if (--i == 0) {
if (--n == 0) {
break;
}
i = (n == 2) ? 6 : 5;
x3 = (x3 - p1[x2 & 0x3f]) & 0xffff;
x2 = (x2 - p1[x1 & 0x3f]) & 0xffff;
x1 = (x1 - p1[x0 & 0x3f]) & 0xffff;
x0 = (x0 - p1[x3 & 0x3f]) & 0xffff;
}
}
d[0] = (uint32_t)(x0 & 0xffff) | ((uint32_t)(x1 & 0xffff) << 16L);
d[1] = (uint32_t)(x2 & 0xffff) | ((uint32_t)(x3 & 0xffff) << 16L);
}
static void RC2_cbc_encrypt(const uint8_t *in, uint8_t *out, size_t length,
RC2_KEY *ks, uint8_t *iv, int encrypt) {
uint32_t tin0, tin1;
uint32_t tout0, tout1, xor0, xor1;
long l = length;
uint32_t tin[2];
if (encrypt) {
c2l(iv, tout0);
c2l(iv, tout1);
iv -= 8;
for (l -= 8; l >= 0; l -= 8) {
c2l(in, tin0);
c2l(in, tin1);
tin0 ^= tout0;
tin1 ^= tout1;
tin[0] = tin0;
tin[1] = tin1;
RC2_encrypt(tin, ks);
tout0 = tin[0];
l2c(tout0, out);
tout1 = tin[1];
l2c(tout1, out);
}
if (l != -8) {
c2ln(in, tin0, tin1, l + 8);
tin0 ^= tout0;
tin1 ^= tout1;
tin[0] = tin0;
tin[1] = tin1;
RC2_encrypt(tin, ks);
tout0 = tin[0];
l2c(tout0, out);
tout1 = tin[1];
l2c(tout1, out);
}
l2c(tout0, iv);
l2c(tout1, iv);
} else {
c2l(iv, xor0);
c2l(iv, xor1);
iv -= 8;
for (l -= 8; l >= 0; l -= 8) {
c2l(in, tin0);
tin[0] = tin0;
c2l(in, tin1);
tin[1] = tin1;
RC2_decrypt(tin, ks);
tout0 = tin[0] ^ xor0;
tout1 = tin[1] ^ xor1;
l2c(tout0, out);
l2c(tout1, out);
xor0 = tin0;
xor1 = tin1;
}
if (l != -8) {
c2l(in, tin0);
tin[0] = tin0;
c2l(in, tin1);
tin[1] = tin1;
RC2_decrypt(tin, ks);
tout0 = tin[0] ^ xor0;
tout1 = tin[1] ^ xor1;
l2cn(tout0, tout1, out, l + 8);
xor0 = tin0;
xor1 = tin1;
}
l2c(xor0, iv);
l2c(xor1, iv);
}
tin[0] = tin[1] = 0;
}
static const uint8_t key_table[256] = {
0xd9, 0x78, 0xf9, 0xc4, 0x19, 0xdd, 0xb5, 0xed, 0x28, 0xe9, 0xfd, 0x79,
0x4a, 0xa0, 0xd8, 0x9d, 0xc6, 0x7e, 0x37, 0x83, 0x2b, 0x76, 0x53, 0x8e,
0x62, 0x4c, 0x64, 0x88, 0x44, 0x8b, 0xfb, 0xa2, 0x17, 0x9a, 0x59, 0xf5,
0x87, 0xb3, 0x4f, 0x13, 0x61, 0x45, 0x6d, 0x8d, 0x09, 0x81, 0x7d, 0x32,
0xbd, 0x8f, 0x40, 0xeb, 0x86, 0xb7, 0x7b, 0x0b, 0xf0, 0x95, 0x21, 0x22,
0x5c, 0x6b, 0x4e, 0x82, 0x54, 0xd6, 0x65, 0x93, 0xce, 0x60, 0xb2, 0x1c,
0x73, 0x56, 0xc0, 0x14, 0xa7, 0x8c, 0xf1, 0xdc, 0x12, 0x75, 0xca, 0x1f,
0x3b, 0xbe, 0xe4, 0xd1, 0x42, 0x3d, 0xd4, 0x30, 0xa3, 0x3c, 0xb6, 0x26,
0x6f, 0xbf, 0x0e, 0xda, 0x46, 0x69, 0x07, 0x57, 0x27, 0xf2, 0x1d, 0x9b,
0xbc, 0x94, 0x43, 0x03, 0xf8, 0x11, 0xc7, 0xf6, 0x90, 0xef, 0x3e, 0xe7,
0x06, 0xc3, 0xd5, 0x2f, 0xc8, 0x66, 0x1e, 0xd7, 0x08, 0xe8, 0xea, 0xde,
0x80, 0x52, 0xee, 0xf7, 0x84, 0xaa, 0x72, 0xac, 0x35, 0x4d, 0x6a, 0x2a,
0x96, 0x1a, 0xd2, 0x71, 0x5a, 0x15, 0x49, 0x74, 0x4b, 0x9f, 0xd0, 0x5e,
0x04, 0x18, 0xa4, 0xec, 0xc2, 0xe0, 0x41, 0x6e, 0x0f, 0x51, 0xcb, 0xcc,
0x24, 0x91, 0xaf, 0x50, 0xa1, 0xf4, 0x70, 0x39, 0x99, 0x7c, 0x3a, 0x85,
0x23, 0xb8, 0xb4, 0x7a, 0xfc, 0x02, 0x36, 0x5b, 0x25, 0x55, 0x97, 0x31,
0x2d, 0x5d, 0xfa, 0x98, 0xe3, 0x8a, 0x92, 0xae, 0x05, 0xdf, 0x29, 0x10,
0x67, 0x6c, 0xba, 0xc9, 0xd3, 0x00, 0xe6, 0xcf, 0xe1, 0x9e, 0xa8, 0x2c,
0x63, 0x16, 0x01, 0x3f, 0x58, 0xe2, 0x89, 0xa9, 0x0d, 0x38, 0x34, 0x1b,
0xab, 0x33, 0xff, 0xb0, 0xbb, 0x48, 0x0c, 0x5f, 0xb9, 0xb1, 0xcd, 0x2e,
0xc5, 0xf3, 0xdb, 0x47, 0xe5, 0xa5, 0x9c, 0x77, 0x0a, 0xa6, 0x20, 0x68,
0xfe, 0x7f, 0xc1, 0xad,
};
static void RC2_set_key(RC2_KEY *key, int len, const uint8_t *data, int bits) {
int i, j;
uint8_t *k;
uint16_t *ki;
unsigned int c, d;
k = (uint8_t *)&key->data[0];
*k = 0; /* for if there is a zero length key */
if (len > 128) {
len = 128;
}
if (bits <= 0) {
bits = 1024;
}
if (bits > 1024) {
bits = 1024;
}
for (i = 0; i < len; i++) {
k[i] = data[i];
}
/* expand table */
d = k[len - 1];
j = 0;
for (i = len; i < 128; i++, j++) {
d = key_table[(k[j] + d) & 0xff];
k[i] = d;
}
/* hmm.... key reduction to 'bits' bits */
j = (bits + 7) >> 3;
i = 128 - j;
c = (0xff >> (-bits & 0x07));
d = key_table[k[i] & c];
k[i] = d;
while (i--) {
d = key_table[k[i + j] ^ d];
k[i] = d;
}
/* copy from bytes into uint16_t's */
ki = &(key->data[63]);
for (i = 127; i >= 0; i -= 2) {
*(ki--) = ((k[i] << 8) | k[i - 1]) & 0xffff;
}
}
typedef struct {
int key_bits; /* effective key bits */
RC2_KEY ks; /* key schedule */
} EVP_RC2_KEY;
static int rc2_init_key(EVP_CIPHER_CTX *ctx, const uint8_t *key,
const uint8_t *iv, int enc) {
EVP_RC2_KEY *rc2_key = (EVP_RC2_KEY *)ctx->cipher_data;
RC2_set_key(&rc2_key->ks, EVP_CIPHER_CTX_key_length(ctx), key,
rc2_key->key_bits);
return 1;
}
static int rc2_cbc_cipher(EVP_CIPHER_CTX *ctx, uint8_t *out, const uint8_t *in,
size_t inl) {
EVP_RC2_KEY *key = (EVP_RC2_KEY *)ctx->cipher_data;
static const size_t kChunkSize = 0x10000;
while (inl >= kChunkSize) {
RC2_cbc_encrypt(in, out, kChunkSize, &key->ks, ctx->iv, ctx->encrypt);
inl -= kChunkSize;
in += kChunkSize;
out += kChunkSize;
}
if (inl) {
RC2_cbc_encrypt(in, out, inl, &key->ks, ctx->iv, ctx->encrypt);
}
return 1;
}
static int rc2_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) {
EVP_RC2_KEY *key = (EVP_RC2_KEY *)ctx->cipher_data;
switch (type) {
case EVP_CTRL_INIT:
key->key_bits = EVP_CIPHER_CTX_key_length(ctx) * 8;
return 1;
default:
return -1;
}
}
static const EVP_CIPHER rc2_40_cbc_cipher = {
NID_rc2_40_cbc,
8 /* block size */,
5 /* 40 bit */,
8 /* iv len */,
sizeof(EVP_RC2_KEY),
EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT,
NULL /* app_data */,
rc2_init_key,
rc2_cbc_cipher,
NULL,
rc2_ctrl,
};
const EVP_CIPHER *EVP_rc2_40_cbc() {
return &rc2_40_cbc_cipher;
}
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