diff options
Diffstat (limited to 'plugins/MirOTR/libotr-3.2.0/toolkit/sesskeys.c')
-rw-r--r-- | plugins/MirOTR/libotr-3.2.0/toolkit/sesskeys.c | 94 |
1 files changed, 0 insertions, 94 deletions
diff --git a/plugins/MirOTR/libotr-3.2.0/toolkit/sesskeys.c b/plugins/MirOTR/libotr-3.2.0/toolkit/sesskeys.c deleted file mode 100644 index d823ebc17b..0000000000 --- a/plugins/MirOTR/libotr-3.2.0/toolkit/sesskeys.c +++ /dev/null @@ -1,94 +0,0 @@ -/* - * Off-the-Record Messaging Toolkit - * Copyright (C) 2004-2008 Ian Goldberg, Chris Alexander, Nikita Borisov - * <otr@cypherpunks.ca> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of version 2 of the GNU General Public License as - * published by the Free Software Foundation. - * - * This program 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 General Public License for more details. - * - * You should have received a copy of the GNU 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 - */ - -/* system headers */ -#include <stdlib.h> - -/* libgcrypt headers */ -#include <gcrypt.h> - -static const char* DH1536_MODULUS_S = "0x" - "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1" - "29024E088A67CC74020BBEA63B139B22514A08798E3404DD" - "EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245" - "E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED" - "EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D" - "C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F" - "83655D23DCA3AD961C62F356208552BB9ED529077096966D" - "670C354E4ABC9804F1746C08CA237327FFFFFFFFFFFFFFFF"; -static const char *DH1536_GENERATOR_S = "0x02"; - -/* Generate the session id and the two encryption keys from our private - * DH key and their public DH key. Also indicate in *high_endp if we - * are the "high" end of the key exchange (set to 1) or the "low" end - * (set to 0) */ -void sesskeys_gen(unsigned char sessionid[20], unsigned char sendenc[16], - unsigned char rcvenc[16], int *high_endp, gcry_mpi_t *our_yp, - gcry_mpi_t our_x, gcry_mpi_t their_y) -{ - gcry_mpi_t modulus, generator, secretv; - unsigned char *secret; - size_t secretlen; - unsigned char hash[20]; - int is_high; - - gcry_mpi_scan(&modulus, GCRYMPI_FMT_HEX, DH1536_MODULUS_S, 0, NULL); - gcry_mpi_scan(&generator, GCRYMPI_FMT_HEX, DH1536_GENERATOR_S, 0, NULL); - *our_yp = gcry_mpi_new(0); - gcry_mpi_powm(*our_yp, generator, our_x, modulus); - secretv = gcry_mpi_new(0); - gcry_mpi_powm(secretv, their_y, our_x, modulus); - gcry_mpi_release(generator); - gcry_mpi_release(modulus); - gcry_mpi_print(GCRYMPI_FMT_USG, NULL, 0, &secretlen, secretv); - secret = malloc(secretlen + 5); - - secret[1] = (secretlen >> 24) & 0xff; - secret[2] = (secretlen >> 16) & 0xff; - secret[3] = (secretlen >> 8) & 0xff; - secret[4] = (secretlen) & 0xff; - gcry_mpi_print(GCRYMPI_FMT_USG, secret+5, secretlen, NULL, secretv); - gcry_mpi_release(secretv); - - is_high = (gcry_mpi_cmp(*our_yp, their_y) > 0); - - /* Calculate the session id */ - secret[0] = 0x00; - gcry_md_hash_buffer(GCRY_MD_SHA1, hash, secret, secretlen+5); - memmove(sessionid, hash, 20); - - /* Calculate the sending enc key */ - secret[0] = is_high ? 0x01 : 0x02; - gcry_md_hash_buffer(GCRY_MD_SHA1, hash, secret, secretlen+5); - memmove(sendenc, hash, 16); - - /* Calculate the receiving enc key */ - secret[0] = is_high ? 0x02 : 0x01; - gcry_md_hash_buffer(GCRY_MD_SHA1, hash, secret, secretlen+5); - memmove(rcvenc, hash, 16); - - *high_endp = is_high; - free(secret); -} - -/* Generate a MAC key from the corresponding encryption key */ -void sesskeys_make_mac(unsigned char mackey[20], unsigned char enckey[16]) -{ - gcry_md_hash_buffer(GCRY_MD_SHA1, mackey, enckey, 16); -} |