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Diffstat (limited to 'libotr/libgcrypt-1.8.7/cipher/rfc2268.c')
| -rw-r--r-- | libotr/libgcrypt-1.8.7/cipher/rfc2268.c | 375 |
1 files changed, 375 insertions, 0 deletions
diff --git a/libotr/libgcrypt-1.8.7/cipher/rfc2268.c b/libotr/libgcrypt-1.8.7/cipher/rfc2268.c new file mode 100644 index 0000000..aed8cad --- /dev/null +++ b/libotr/libgcrypt-1.8.7/cipher/rfc2268.c @@ -0,0 +1,375 @@ +/* rfc2268.c - The cipher described in rfc2268; aka Ron's Cipher 2. + * Copyright (C) 2003 Nikos Mavroyanopoulos + * Copyright (C) 2004 Free Software Foundation, Inc. + * + * This file is part of Libgcrypt + * + * Libgcrypt is free software; you can redistribute it and/or modify + * it under the terms of the GNU Lesser general Public License as + * published by the Free Software Foundation; either version 2.1 of + * the License, or (at your option) any later version. + * + * Libgcrypt is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA + */ + +/* This implementation was written by Nikos Mavroyanopoulos for GNUTLS + * as a Libgcrypt module (gnutls/lib/x509/rc2.c) and later adapted for + * direct use by Libgcrypt by Werner Koch. This implementation is + * only useful for pkcs#12 decryption. + * + * The implementation here is based on Peter Gutmann's RRC.2 paper. + */ + + +#include <config.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include "g10lib.h" +#include "types.h" +#include "cipher.h" + +#define RFC2268_BLOCKSIZE 8 + +typedef struct +{ + u16 S[64]; +} RFC2268_context; + +static const unsigned char rfc2268_sbox[] = { + 217, 120, 249, 196, 25, 221, 181, 237, + 40, 233, 253, 121, 74, 160, 216, 157, + 198, 126, 55, 131, 43, 118, 83, 142, + 98, 76, 100, 136, 68, 139, 251, 162, + 23, 154, 89, 245, 135, 179, 79, 19, + 97, 69, 109, 141, 9, 129, 125, 50, + 189, 143, 64, 235, 134, 183, 123, 11, + 240, 149, 33, 34, 92, 107, 78, 130, + 84, 214, 101, 147, 206, 96, 178, 28, + 115, 86, 192, 20, 167, 140, 241, 220, + 18, 117, 202, 31, 59, 190, 228, 209, + 66, 61, 212, 48, 163, 60, 182, 38, + 111, 191, 14, 218, 70, 105, 7, 87, + 39, 242, 29, 155, 188, 148, 67, 3, + 248, 17, 199, 246, 144, 239, 62, 231, + 6, 195, 213, 47, 200, 102, 30, 215, + 8, 232, 234, 222, 128, 82, 238, 247, + 132, 170, 114, 172, 53, 77, 106, 42, + 150, 26, 210, 113, 90, 21, 73, 116, + 75, 159, 208, 94, 4, 24, 164, 236, + 194, 224, 65, 110, 15, 81, 203, 204, + 36, 145, 175, 80, 161, 244, 112, 57, + 153, 124, 58, 133, 35, 184, 180, 122, + 252, 2, 54, 91, 37, 85, 151, 49, + 45, 93, 250, 152, 227, 138, 146, 174, + 5, 223, 41, 16, 103, 108, 186, 201, + 211, 0, 230, 207, 225, 158, 168, 44, + 99, 22, 1, 63, 88, 226, 137, 169, + 13, 56, 52, 27, 171, 51, 255, 176, + 187, 72, 12, 95, 185, 177, 205, 46, + 197, 243, 219, 71, 229, 165, 156, 119, + 10, 166, 32, 104, 254, 127, 193, 173 +}; + +#define rotl16(x,n) (((x) << ((u16)(n))) | ((x) >> (16 - (u16)(n)))) +#define rotr16(x,n) (((x) >> ((u16)(n))) | ((x) << (16 - (u16)(n)))) + +static const char *selftest (void); + + +static void +do_encrypt (void *context, unsigned char *outbuf, const unsigned char *inbuf) +{ + RFC2268_context *ctx = context; + register int i, j; + u16 word0 = 0, word1 = 0, word2 = 0, word3 = 0; + + word0 = (word0 << 8) | inbuf[1]; + word0 = (word0 << 8) | inbuf[0]; + word1 = (word1 << 8) | inbuf[3]; + word1 = (word1 << 8) | inbuf[2]; + word2 = (word2 << 8) | inbuf[5]; + word2 = (word2 << 8) | inbuf[4]; + word3 = (word3 << 8) | inbuf[7]; + word3 = (word3 << 8) | inbuf[6]; + + for (i = 0; i < 16; i++) + { + j = i * 4; + /* For some reason I cannot combine those steps. */ + word0 += (word1 & ~word3) + (word2 & word3) + ctx->S[j]; + word0 = rotl16(word0, 1); + + word1 += (word2 & ~word0) + (word3 & word0) + ctx->S[j + 1]; + word1 = rotl16(word1, 2); + + word2 += (word3 & ~word1) + (word0 & word1) + ctx->S[j + 2]; + word2 = rotl16(word2, 3); + + word3 += (word0 & ~word2) + (word1 & word2) + ctx->S[j + 3]; + word3 = rotl16(word3, 5); + + if (i == 4 || i == 10) + { + word0 += ctx->S[word3 & 63]; + word1 += ctx->S[word0 & 63]; + word2 += ctx->S[word1 & 63]; + word3 += ctx->S[word2 & 63]; + } + + } + + outbuf[0] = word0 & 255; + outbuf[1] = word0 >> 8; + outbuf[2] = word1 & 255; + outbuf[3] = word1 >> 8; + outbuf[4] = word2 & 255; + outbuf[5] = word2 >> 8; + outbuf[6] = word3 & 255; + outbuf[7] = word3 >> 8; +} + +static unsigned int +encrypt_block (void *context, unsigned char *outbuf, const unsigned char *inbuf) +{ + do_encrypt (context, outbuf, inbuf); + return /*burn_stack*/ (4 * sizeof(void *) + sizeof(void *) + sizeof(u32) * 4); +} + +static void +do_decrypt (void *context, unsigned char *outbuf, const unsigned char *inbuf) +{ + RFC2268_context *ctx = context; + register int i, j; + u16 word0 = 0, word1 = 0, word2 = 0, word3 = 0; + + word0 = (word0 << 8) | inbuf[1]; + word0 = (word0 << 8) | inbuf[0]; + word1 = (word1 << 8) | inbuf[3]; + word1 = (word1 << 8) | inbuf[2]; + word2 = (word2 << 8) | inbuf[5]; + word2 = (word2 << 8) | inbuf[4]; + word3 = (word3 << 8) | inbuf[7]; + word3 = (word3 << 8) | inbuf[6]; + + for (i = 15; i >= 0; i--) + { + j = i * 4; + + word3 = rotr16(word3, 5); + word3 -= (word0 & ~word2) + (word1 & word2) + ctx->S[j + 3]; + + word2 = rotr16(word2, 3); + word2 -= (word3 & ~word1) + (word0 & word1) + ctx->S[j + 2]; + + word1 = rotr16(word1, 2); + word1 -= (word2 & ~word0) + (word3 & word0) + ctx->S[j + 1]; + + word0 = rotr16(word0, 1); + word0 -= (word1 & ~word3) + (word2 & word3) + ctx->S[j]; + + if (i == 5 || i == 11) + { + word3 = word3 - ctx->S[word2 & 63]; + word2 = word2 - ctx->S[word1 & 63]; + word1 = word1 - ctx->S[word0 & 63]; + word0 = word0 - ctx->S[word3 & 63]; + } + + } + + outbuf[0] = word0 & 255; + outbuf[1] = word0 >> 8; + outbuf[2] = word1 & 255; + outbuf[3] = word1 >> 8; + outbuf[4] = word2 & 255; + outbuf[5] = word2 >> 8; + outbuf[6] = word3 & 255; + outbuf[7] = word3 >> 8; +} + +static unsigned int +decrypt_block (void *context, unsigned char *outbuf, const unsigned char *inbuf) +{ + do_decrypt (context, outbuf, inbuf); + return /*burn_stack*/ (4 * sizeof(void *) + sizeof(void *) + sizeof(u32) * 4); +} + + +static gpg_err_code_t +setkey_core (void *context, const unsigned char *key, unsigned int keylen, int with_phase2) +{ + static int initialized; + static const char *selftest_failed; + RFC2268_context *ctx = context; + unsigned int i; + unsigned char *S, x; + int len; + int bits = keylen * 8; + + if (!initialized) + { + initialized = 1; + selftest_failed = selftest (); + if (selftest_failed) + log_error ("RFC2268 selftest failed (%s).\n", selftest_failed); + } + if (selftest_failed) + return GPG_ERR_SELFTEST_FAILED; + + if (keylen < 40 / 8) /* We want at least 40 bits. */ + return GPG_ERR_INV_KEYLEN; + + S = (unsigned char *) ctx->S; + + for (i = 0; i < keylen; i++) + S[i] = key[i]; + + for (i = keylen; i < 128; i++) + S[i] = rfc2268_sbox[(S[i - keylen] + S[i - 1]) & 255]; + + S[0] = rfc2268_sbox[S[0]]; + + /* Phase 2 - reduce effective key size to "bits". This was not + * discussed in Gutmann's paper. I've copied that from the public + * domain code posted in sci.crypt. */ + if (with_phase2) + { + len = (bits + 7) >> 3; + i = 128 - len; + x = rfc2268_sbox[S[i] & (255 >> (7 & -bits))]; + S[i] = x; + + while (i--) + { + x = rfc2268_sbox[x ^ S[i + len]]; + S[i] = x; + } + } + + /* Make the expanded key, endian independent. */ + for (i = 0; i < 64; i++) + ctx->S[i] = ( (u16) S[i * 2] | (((u16) S[i * 2 + 1]) << 8)); + + return 0; +} + +static gpg_err_code_t +do_setkey (void *context, const unsigned char *key, unsigned int keylen) +{ + return setkey_core (context, key, keylen, 1); +} + +static const char * +selftest (void) +{ + RFC2268_context ctx; + unsigned char scratch[16]; + + /* Test vectors from Peter Gutmann's paper. */ + static unsigned char key_1[] = + { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 + }; + static unsigned char plaintext_1[] = + { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; + static const unsigned char ciphertext_1[] = + { 0x1C, 0x19, 0x8A, 0x83, 0x8D, 0xF0, 0x28, 0xB7 }; + + static unsigned char key_2[] = + { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, + 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F + }; + static unsigned char plaintext_2[] = + { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; + static unsigned char ciphertext_2[] = + { 0x50, 0xDC, 0x01, 0x62, 0xBD, 0x75, 0x7F, 0x31 }; + + /* This one was checked against libmcrypt's RFC2268. */ + static unsigned char key_3[] = + { 0x30, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 + }; + static unsigned char plaintext_3[] = + { 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; + static unsigned char ciphertext_3[] = + { 0x8f, 0xd1, 0x03, 0x89, 0x33, 0x6b, 0xf9, 0x5e }; + + + /* First test. */ + setkey_core (&ctx, key_1, sizeof(key_1), 0); + do_encrypt (&ctx, scratch, plaintext_1); + + if (memcmp (scratch, ciphertext_1, sizeof(ciphertext_1))) + return "RFC2268 encryption test 1 failed."; + + setkey_core (&ctx, key_1, sizeof(key_1), 0); + do_decrypt (&ctx, scratch, scratch); + if (memcmp (scratch, plaintext_1, sizeof(plaintext_1))) + return "RFC2268 decryption test 1 failed."; + + /* Second test. */ + setkey_core (&ctx, key_2, sizeof(key_2), 0); + do_encrypt (&ctx, scratch, plaintext_2); + if (memcmp (scratch, ciphertext_2, sizeof(ciphertext_2))) + return "RFC2268 encryption test 2 failed."; + + setkey_core (&ctx, key_2, sizeof(key_2), 0); + do_decrypt (&ctx, scratch, scratch); + if (memcmp (scratch, plaintext_2, sizeof(plaintext_2))) + return "RFC2268 decryption test 2 failed."; + + /* Third test. */ + setkey_core(&ctx, key_3, sizeof(key_3), 0); + do_encrypt(&ctx, scratch, plaintext_3); + + if (memcmp(scratch, ciphertext_3, sizeof(ciphertext_3))) + return "RFC2268 encryption test 3 failed."; + + setkey_core (&ctx, key_3, sizeof(key_3), 0); + do_decrypt (&ctx, scratch, scratch); + if (memcmp(scratch, plaintext_3, sizeof(plaintext_3))) + return "RFC2268 decryption test 3 failed."; + + return NULL; +} + + + +static gcry_cipher_oid_spec_t oids_rfc2268_40[] = + { + /*{ "1.2.840.113549.3.2", GCRY_CIPHER_MODE_CBC },*/ + /* pbeWithSHAAnd40BitRC2_CBC */ + { "1.2.840.113549.1.12.1.6", GCRY_CIPHER_MODE_CBC }, + { NULL } + }; + +static gcry_cipher_oid_spec_t oids_rfc2268_128[] = + { + /* pbeWithSHAAnd128BitRC2_CBC */ + { "1.2.840.113549.1.12.1.5", GCRY_CIPHER_MODE_CBC }, + { NULL } + }; + +gcry_cipher_spec_t _gcry_cipher_spec_rfc2268_40 = + { + GCRY_CIPHER_RFC2268_40, {0, 0}, + "RFC2268_40", NULL, oids_rfc2268_40, + RFC2268_BLOCKSIZE, 40, sizeof(RFC2268_context), + do_setkey, encrypt_block, decrypt_block + }; + +gcry_cipher_spec_t _gcry_cipher_spec_rfc2268_128 = + { + GCRY_CIPHER_RFC2268_128, {0, 0}, + "RFC2268_128", NULL, oids_rfc2268_128, + RFC2268_BLOCKSIZE, 128, sizeof(RFC2268_context), + do_setkey, encrypt_block, decrypt_block + }; |