diff options
Diffstat (limited to 'third_party/heimdal/lib/hcrypto/rc2.c')
| -rw-r--r-- | third_party/heimdal/lib/hcrypto/rc2.c | 240 |
1 files changed, 240 insertions, 0 deletions
diff --git a/third_party/heimdal/lib/hcrypto/rc2.c b/third_party/heimdal/lib/hcrypto/rc2.c new file mode 100644 index 0000000..02b684c --- /dev/null +++ b/third_party/heimdal/lib/hcrypto/rc2.c @@ -0,0 +1,240 @@ +/* + * Copyright (c) 2004 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * All rights reserved. + * + * 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 above 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. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE 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. + */ + +#include <config.h> +#include <roken.h> + +#include "rc2.h" + +/* + * Implemented from Peter Gutmann's "Specification for Ron Rivests Cipher No.2" + * rfc2268 and "On the Design and Security of RC2" was also useful. + */ + +static unsigned int Sbox[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 +}; + +void +RC2_set_key(RC2_KEY *key, int len, const unsigned char *data, int bits) +{ + unsigned char k[128]; + int j, T8, TM; + + if (len <= 0) + abort(); + if (len > 128) + len = 128; + if (bits <= 0 || bits > 1024) + bits = 1024; + + for (j = 0; j < len; j++) + k[j] = data[j]; + for (; j < 128; j++) + k[j] = Sbox[(k[j - len] + k[j - 1]) & 0xff]; + + T8 = (bits + 7) / 8; + j = (8*T8 - bits); + TM = 0xff >> j; + + k[128 - T8] = Sbox[k[128 - T8] & TM]; + + for (j = 127 - T8; j >= 0; j--) + k[j] = Sbox[k[j + 1] ^ k[j + T8]]; + + for (j = 0; j < 64; j++) + key->data[j] = k[(j * 2) + 0] | (k[(j * 2) + 1] << 8); + memset(k, 0, sizeof(k)); +} + +#define ROT16L(w,n) ((w<<n)|(w>>(16-n))) +#define ROT16R(w,n) ((w>>n)|(w<<(16-n))) + +void +RC2_encryptc(unsigned char *in, unsigned char *out, const RC2_KEY *key) +{ + int i, j; + int w0, w1, w2, w3; + int t0, t1, t2, t3; + + w0 = in[0] | (in[1] << 8); + w1 = in[2] | (in[3] << 8); + w2 = in[4] | (in[5] << 8); + w3 = in[6] | (in[7] << 8); + + for (i = 0; i < 16; i++) { + j = i * 4; + t0 = (w0 + (w1 & ~w3) + (w2 & w3) + key->data[j + 0]) & 0xffff; + w0 = ROT16L(t0, 1); + t1 = (w1 + (w2 & ~w0) + (w3 & w0) + key->data[j + 1]) & 0xffff; + w1 = ROT16L(t1, 2); + t2 = (w2 + (w3 & ~w1) + (w0 & w1) + key->data[j + 2]) & 0xffff; + w2 = ROT16L(t2, 3); + t3 = (w3 + (w0 & ~w2) + (w1 & w2) + key->data[j + 3]) & 0xffff; + w3 = ROT16L(t3, 5); + if(i == 4 || i == 10) { + w0 += key->data[w3 & 63]; + w1 += key->data[w0 & 63]; + w2 += key->data[w1 & 63]; + w3 += key->data[w2 & 63]; + } + } + + out[0] = w0 & 0xff; + out[1] = (w0 >> 8) & 0xff; + out[2] = w1 & 0xff; + out[3] = (w1 >> 8) & 0xff; + out[4] = w2 & 0xff; + out[5] = (w2 >> 8) & 0xff; + out[6] = w3 & 0xff; + out[7] = (w3 >> 8) & 0xff; +} + +void +RC2_decryptc(unsigned char *in, unsigned char *out, const RC2_KEY *key) +{ + int i, j; + int w0, w1, w2, w3; + int t0, t1, t2, t3; + + w0 = in[0] | (in[1] << 8); + w1 = in[2] | (in[3] << 8); + w2 = in[4] | (in[5] << 8); + w3 = in[6] | (in[7] << 8); + + for (i = 15; i >= 0; i--) { + j = i * 4; + + if(i == 4 || i == 10) { + w3 = (w3 - key->data[w2 & 63]) & 0xffff; + w2 = (w2 - key->data[w1 & 63]) & 0xffff; + w1 = (w1 - key->data[w0 & 63]) & 0xffff; + w0 = (w0 - key->data[w3 & 63]) & 0xffff; + } + + t3 = ROT16R(w3, 5); + w3 = (t3 - (w0 & ~w2) - (w1 & w2) - key->data[j + 3]) & 0xffff; + t2 = ROT16R(w2, 3); + w2 = (t2 - (w3 & ~w1) - (w0 & w1) - key->data[j + 2]) & 0xffff; + t1 = ROT16R(w1, 2); + w1 = (t1 - (w2 & ~w0) - (w3 & w0) - key->data[j + 1]) & 0xffff; + t0 = ROT16R(w0, 1); + w0 = (t0 - (w1 & ~w3) - (w2 & w3) - key->data[j + 0]) & 0xffff; + + } + out[0] = w0 & 0xff; + out[1] = (w0 >> 8) & 0xff; + out[2] = w1 & 0xff; + out[3] = (w1 >> 8) & 0xff; + out[4] = w2 & 0xff; + out[5] = (w2 >> 8) & 0xff; + out[6] = w3 & 0xff; + out[7] = (w3 >> 8) & 0xff; +} + +void +RC2_cbc_encrypt(const unsigned char *in, unsigned char *out, long size, + RC2_KEY *key, unsigned char *iv, int forward_encrypt) +{ + unsigned char tmp[RC2_BLOCK_SIZE]; + int i; + + if (forward_encrypt) { + while (size >= RC2_BLOCK_SIZE) { + for (i = 0; i < RC2_BLOCK_SIZE; i++) + tmp[i] = in[i] ^ iv[i]; + RC2_encryptc(tmp, out, key); + memcpy(iv, out, RC2_BLOCK_SIZE); + size -= RC2_BLOCK_SIZE; + in += RC2_BLOCK_SIZE; + out += RC2_BLOCK_SIZE; + } + if (size) { + for (i = 0; i < size; i++) + tmp[i] = in[i] ^ iv[i]; + for (i = size; i < RC2_BLOCK_SIZE; i++) + tmp[i] = iv[i]; + RC2_encryptc(tmp, out, key); + memcpy(iv, out, RC2_BLOCK_SIZE); + } + } else { + while (size >= RC2_BLOCK_SIZE) { + memcpy(tmp, in, RC2_BLOCK_SIZE); + RC2_decryptc(tmp, out, key); + for (i = 0; i < RC2_BLOCK_SIZE; i++) + out[i] ^= iv[i]; + memcpy(iv, tmp, RC2_BLOCK_SIZE); + size -= RC2_BLOCK_SIZE; + in += RC2_BLOCK_SIZE; + out += RC2_BLOCK_SIZE; + } + if (size) { + memcpy(tmp, in, RC2_BLOCK_SIZE); + RC2_decryptc(tmp, out, key); + for (i = 0; i < size; i++) + out[i] ^= iv[i]; + memcpy(iv, tmp, RC2_BLOCK_SIZE); + } + } +} |