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102 lines
2.8 KiB
102 lines
2.8 KiB
/* |
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* RTMP Diffie-Hellmann utilities |
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* Copyright (c) 2012 Samuel Pitoiset |
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* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#ifndef AVFORMAT_RTMPDH_H |
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#define AVFORMAT_RTMPDH_H |
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#include "avformat.h" |
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#include "config.h" |
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#if CONFIG_NETTLE || CONFIG_GCRYPT |
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#if CONFIG_NETTLE |
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#include <gmp.h> |
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#include <nettle/bignum.h> |
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typedef mpz_ptr FFBigNum; |
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#elif CONFIG_GCRYPT |
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#include <gcrypt.h> |
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typedef gcry_mpi_t FFBigNum; |
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#endif |
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typedef struct FF_DH { |
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FFBigNum p; |
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FFBigNum g; |
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FFBigNum pub_key; |
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FFBigNum priv_key; |
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long length; |
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} FF_DH; |
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#elif CONFIG_OPENSSL |
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#include <openssl/bn.h> |
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#include <openssl/dh.h> |
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typedef BIGNUM *FFBigNum; |
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typedef DH FF_DH; |
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#endif |
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/** |
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* Initialize a Diffie-Hellmann context. |
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* |
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* @param key_len length of the key |
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* @return a new Diffie-Hellmann context on success, NULL otherwise |
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*/ |
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FF_DH *ff_dh_init(int key_len); |
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/** |
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* Free a Diffie-Hellmann context. |
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* |
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* @param dh a Diffie-Hellmann context to free |
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*/ |
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void ff_dh_free(FF_DH *dh); |
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/** |
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* Generate a public key. |
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* |
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* @param dh a Diffie-Hellmann context |
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* @return zero on success, negative value otherwise |
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*/ |
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int ff_dh_generate_public_key(FF_DH *dh); |
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/** |
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* Write the public key into the given buffer. |
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* |
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* @param dh a Diffie-Hellmann context, containing the public key to write |
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* @param pub_key the buffer where the public key is written |
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* @param pub_key_len the length of the buffer |
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* @return zero on success, negative value otherwise |
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*/ |
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int ff_dh_write_public_key(FF_DH *dh, uint8_t *pub_key, int pub_key_len); |
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/** |
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* Compute the shared secret key from the private FF_DH value and the |
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* other party's public value. |
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* |
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* @param dh a Diffie-Hellmann context, containing the private key |
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* @param pub_key the buffer containing the public key |
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* @param pub_key_len the length of the buffer |
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* @param secret_key the buffer where the secret key is written |
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* @return length of the shared secret key on success, negative value otherwise |
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*/ |
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int ff_dh_compute_shared_secret_key(FF_DH *dh, const uint8_t *pub_key, |
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int pub_key_len, uint8_t *secret_key); |
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#endif /* AVFORMAT_RTMPDH_H */
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