/* $OpenBSD: t1_enc.c,v 1.159 2026/04/03 13:11:00 jsing Exp $ */ /* 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.] */ /* ==================================================================== * Copyright (c) 1998-2007 The OpenSSL Project. 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. All advertising materials mentioning features or use of this * software must display the following acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" * * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to * endorse or promote products derived from this software without * prior written permission. For written permission, please contact * openssl-core@openssl.org. * * 5. Products derived from this software may not be called "OpenSSL" * nor may "OpenSSL" appear in their names without prior written * permission of the OpenSSL Project. * * 6. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit (http://www.openssl.org/)" * * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY * EXPRESSED 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 OpenSSL PROJECT OR * ITS 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. * ==================================================================== * * This product includes cryptographic software written by Eric Young * (eay@cryptsoft.com). This product includes software written by Tim * Hudson (tjh@cryptsoft.com). * */ /* ==================================================================== * Copyright 2005 Nokia. All rights reserved. * * The portions of the attached software ("Contribution") is developed by * Nokia Corporation and is licensed pursuant to the OpenSSL open source * license. * * The Contribution, originally written by Mika Kousa and Pasi Eronen of * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites * support (see RFC 4279) to OpenSSL. * * No patent licenses or other rights except those expressly stated in * the OpenSSL open source license shall be deemed granted or received * expressly, by implication, estoppel, or otherwise. * * No assurances are provided by Nokia that the Contribution does not * infringe the patent or other intellectual property rights of any third * party or that the license provides you with all the necessary rights * to make use of the Contribution. * * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR * OTHERWISE. */ #include <limits.h> #include <stdio.h> #include <openssl/evp.h> #include <openssl/hmac.h> #include <openssl/md5.h> #include <openssl/opensslconf.h> #include "dtls_local.h" #include "ssl_local.h" void tls1_cleanup_key_block(SSL *s) { tls12_key_block_free(s->s3->hs.tls12.key_block); s->s3->hs.tls12.key_block = NULL; } /* * TLS P_hash() data expansion function - see RFC 5246, section 5. */ static int tls1_P_hash(const EVP_MD *md, const unsigned char *secret, size_t secret_len, const void *seed1, size_t seed1_len, const void *seed2, size_t seed2_len, const void *seed3, size_t seed3_len, const void *seed4, size_t seed4_len, const void *seed5, size_t seed5_len, unsigned char *out, size_t out_len) { unsigned char A1[EVP_MAX_MD_SIZE], hmac[EVP_MAX_MD_SIZE]; size_t A1_len, hmac_len; EVP_MD_CTX *ctx = NULL; EVP_PKEY *mac_key = NULL; int ret = 0; int chunk; size_t i; chunk = EVP_MD_size(md); OPENSSL_assert(chunk >= 0); if ((ctx = EVP_MD_CTX_new()) == NULL) goto err; mac_key = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL, secret, secret_len); if (mac_key == NULL) goto err; if (!EVP_DigestSignInit(ctx, NULL, md, NULL, mac_key)) goto err; if (seed1 && !EVP_DigestSignUpdate(ctx, seed1, seed1_len)) goto err; if (seed2 && !EVP_DigestSignUpdate(ctx, seed2, seed2_len)) goto err; if (seed3 && !EVP_DigestSignUpdate(ctx, seed3, seed3_len)) goto err; if (seed4 && !EVP_DigestSignUpdate(ctx, seed4, seed4_len)) goto err; if (seed5 && !EVP_DigestSignUpdate(ctx, seed5, seed5_len)) goto err; if (!EVP_DigestSignFinal(ctx, A1, &A1_len)) goto err; for (;;) { if (!EVP_DigestSignInit(ctx, NULL, md, NULL, mac_key)) goto err; if (!EVP_DigestSignUpdate(ctx, A1, A1_len)) goto err; if (seed1 && !EVP_DigestSignUpdate(ctx, seed1, seed1_len)) goto err; if (seed2 && !EVP_DigestSignUpdate(ctx, seed2, seed2_len)) goto err; if (seed3 && !EVP_DigestSignUpdate(ctx, seed3, seed3_len)) goto err; if (seed4 && !EVP_DigestSignUpdate(ctx, seed4, seed4_len)) goto err; if (seed5 && !EVP_DigestSignUpdate(ctx, seed5, seed5_len)) goto err; if (!EVP_DigestSignFinal(ctx, hmac, &hmac_len)) goto err; if (hmac_len > out_len) hmac_len = out_len; for (i = 0; i < hmac_len; i++) out[i] ^= hmac[i]; out += hmac_len; out_len -= hmac_len; if (out_len == 0) break; if (!EVP_DigestSignInit(ctx, NULL, md, NULL, mac_key)) goto err; if (!EVP_DigestSignUpdate(ctx, A1, A1_len)) goto err; if (!EVP_DigestSignFinal(ctx, A1, &A1_len)) goto err; } ret = 1; err: EVP_PKEY_free(mac_key); EVP_MD_CTX_free(ctx); explicit_bzero(A1, sizeof(A1)); explicit_bzero(hmac, sizeof(hmac)); return ret; } int tls1_PRF(SSL *s, const unsigned char *secret, size_t secret_len, const void *seed1, size_t seed1_len, const void *seed2, size_t seed2_len, const void *seed3, size_t seed3_len, const void *seed4, size_t seed4_len, const void *seed5, size_t seed5_len, unsigned char *out, size_t out_len) { const EVP_MD *md; size_t half_len; memset(out, 0, out_len); if (!ssl_get_handshake_evp_md(s, &md)) return (0); if (EVP_MD_type(md) == NID_md5_sha1) { /* * Partition secret between MD5 and SHA1, then XOR result. * If the secret length is odd, a one byte overlap is used. */ half_len = secret_len - (secret_len / 2); if (!tls1_P_hash(EVP_md5(), secret, half_len, seed1, seed1_len, seed2, seed2_len, seed3, seed3_len, seed4, seed4_len, seed5, seed5_len, out, out_len)) return (0); secret += secret_len - half_len; if (!tls1_P_hash(EVP_sha1(), secret, half_len, seed1, seed1_len, seed2, seed2_len, seed3, seed3_len, seed4, seed4_len, seed5, seed5_len, out, out_len)) return (0); return (1); } if (!tls1_P_hash(md, secret, secret_len, seed1, seed1_len, seed2, seed2_len, seed3, seed3_len, seed4, seed4_len, seed5, seed5_len, out, out_len)) return (0); return (1); } int tls1_generate_key_block(SSL *s, uint8_t *key_block, size_t key_block_len) { return tls1_PRF(s, s->session->master_key, s->session->master_key_length, TLS_MD_KEY_EXPANSION_CONST, TLS_MD_KEY_EXPANSION_CONST_SIZE, s->s3->server_random, SSL3_RANDOM_SIZE, s->s3->client_random, SSL3_RANDOM_SIZE, NULL, 0, NULL, 0, key_block, key_block_len); } static int tls1_change_cipher_state(SSL *s, int is_write) { CBS mac_key, key, iv; /* Use client write keys on client write and server read. */ if ((!s->server && is_write) || (s->server && !is_write)) { tls12_key_block_client_write(s->s3->hs.tls12.key_block, &mac_key, &key, &iv); } else { tls12_key_block_server_write(s->s3->hs.tls12.key_block, &mac_key, &key, &iv); } if (!is_write) { if (!tls12_record_layer_change_read_cipher_state(s->rl, &mac_key, &key, &iv)) goto err; if (SSL_is_dtls(s)) dtls1_reset_read_seq_numbers(s); } else { if (!tls12_record_layer_change_write_cipher_state(s->rl, &mac_key, &key, &iv)) goto err; } return (1); err: return (0); } int tls1_change_read_cipher_state(SSL *s) { return tls1_change_cipher_state(s, 0); } int tls1_change_write_cipher_state(SSL *s) { return tls1_change_cipher_state(s, 1); } int tls1_setup_key_block(SSL *s) { struct tls12_key_block *key_block; int mac_type = NID_undef, mac_secret_size = 0; const EVP_CIPHER *cipher = NULL; const EVP_AEAD *aead = NULL; const EVP_MD *handshake_hash = NULL; const EVP_MD *mac_hash = NULL; int ret = 0; /* * XXX - callers should be changed so that they only call this * function once. */ if (s->s3->hs.tls12.key_block != NULL) return (1); if (s->s3->hs.cipher == NULL) return (0); if ((s->s3->hs.cipher->algorithm_mac & SSL_AEAD) != 0) { if (!ssl_cipher_get_evp_aead(s, &aead)) { SSLerror(s, SSL_R_CIPHER_OR_HASH_UNAVAILABLE); return (0); } } else { /* XXX - mac_type and mac_secret_size are now unused. */ if (!ssl_cipher_get_evp(s, &cipher, &mac_hash, &mac_type, &mac_secret_size)) { SSLerror(s, SSL_R_CIPHER_OR_HASH_UNAVAILABLE); return (0); } } if (!ssl_get_handshake_evp_md(s, &handshake_hash)) return (0); tls12_record_layer_set_aead(s->rl, aead); tls12_record_layer_set_cipher_hash(s->rl, cipher, handshake_hash, mac_hash); if ((key_block = tls12_key_block_new()) == NULL) goto err; if (!tls12_key_block_generate(key_block, s, aead, cipher, mac_hash)) goto err; s->s3->hs.tls12.key_block = key_block; key_block = NULL; ret = 1; err: tls12_key_block_free(key_block); return (ret); }
