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Diffstat (limited to 'ffmpeg1/libavformat/rtmpdh.c')
| -rw-r--r-- | ffmpeg1/libavformat/rtmpdh.c | 339 |
1 files changed, 0 insertions, 339 deletions
diff --git a/ffmpeg1/libavformat/rtmpdh.c b/ffmpeg1/libavformat/rtmpdh.c deleted file mode 100644 index 7d6734d..0000000 --- a/ffmpeg1/libavformat/rtmpdh.c +++ /dev/null @@ -1,339 +0,0 @@ -/* - * RTMP Diffie-Hellmann utilities - * Copyright (c) 2009 Andrej Stepanchuk - * Copyright (c) 2009-2010 Howard Chu - * Copyright (c) 2012 Samuel Pitoiset - * - * This file is part of FFmpeg. - * - * FFmpeg 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. - * - * FFmpeg 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 FFmpeg; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -/** - * @file - * RTMP Diffie-Hellmann utilities - */ - -#include "config.h" -#include "rtmpdh.h" -#include "libavutil/random_seed.h" - -#define P1024 \ - "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1" \ - "29024E088A67CC74020BBEA63B139B22514A08798E3404DD" \ - "EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245" \ - "E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED" \ - "EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE65381" \ - "FFFFFFFFFFFFFFFF" - -#define Q1024 \ - "7FFFFFFFFFFFFFFFE487ED5110B4611A62633145C06E0E68" \ - "948127044533E63A0105DF531D89CD9128A5043CC71A026E" \ - "F7CA8CD9E69D218D98158536F92F8A1BA7F09AB6B6A8E122" \ - "F242DABB312F3F637A262174D31BF6B585FFAE5B7A035BF6" \ - "F71C35FDAD44CFD2D74F9208BE258FF324943328F67329C0" \ - "FFFFFFFFFFFFFFFF" - -#if CONFIG_NETTLE || CONFIG_GCRYPT -#if CONFIG_NETTLE -#define bn_new(bn) \ - do { \ - bn = av_malloc(sizeof(*bn)); \ - if (bn) \ - mpz_init2(bn, 1); \ - } while (0) -#define bn_free(bn) \ - do { \ - mpz_clear(bn); \ - av_free(bn); \ - } while (0) -#define bn_set_word(bn, w) mpz_set_ui(bn, w) -#define bn_cmp(a, b) mpz_cmp(a, b) -#define bn_copy(to, from) mpz_set(to, from) -#define bn_sub_word(bn, w) mpz_sub_ui(bn, bn, w) -#define bn_cmp_1(bn) mpz_cmp_ui(bn, 1) -#define bn_num_bytes(bn) (mpz_sizeinbase(bn, 2) + 7) / 8 -#define bn_bn2bin(bn, buf, len) nettle_mpz_get_str_256(len, buf, bn) -#define bn_bin2bn(bn, buf, len) \ - do { \ - bn_new(bn); \ - if (bn) \ - nettle_mpz_set_str_256_u(bn, len, buf); \ - } while (0) -#define bn_hex2bn(bn, buf, ret) \ - do { \ - bn_new(bn); \ - if (bn) \ - ret = (mpz_set_str(bn, buf, 16) == 0); \ - } while (0) -#define bn_modexp(bn, y, q, p) mpz_powm(bn, y, q, p) -#define bn_random(bn, num_bytes) \ - do { \ - gmp_randstate_t rs; \ - gmp_randinit_mt(rs); \ - gmp_randseed_ui(rs, av_get_random_seed()); \ - mpz_urandomb(bn, rs, num_bytes); \ - gmp_randclear(rs); \ - } while (0) -#elif CONFIG_GCRYPT -#define bn_new(bn) bn = gcry_mpi_new(1) -#define bn_free(bn) gcry_mpi_release(bn) -#define bn_set_word(bn, w) gcry_mpi_set_ui(bn, w) -#define bn_cmp(a, b) gcry_mpi_cmp(a, b) -#define bn_copy(to, from) gcry_mpi_set(to, from) -#define bn_sub_word(bn, w) gcry_mpi_sub_ui(bn, bn, w) -#define bn_cmp_1(bn) gcry_mpi_cmp_ui(bn, 1) -#define bn_num_bytes(bn) (gcry_mpi_get_nbits(bn) + 7) / 8 -#define bn_bn2bin(bn, buf, len) gcry_mpi_print(GCRYMPI_FMT_USG, buf, len, NULL, bn) -#define bn_bin2bn(bn, buf, len) gcry_mpi_scan(&bn, GCRYMPI_FMT_USG, buf, len, NULL) -#define bn_hex2bn(bn, buf, ret) ret = (gcry_mpi_scan(&bn, GCRYMPI_FMT_HEX, buf, 0, 0) == 0) -#define bn_modexp(bn, y, q, p) gcry_mpi_powm(bn, y, q, p) -#define bn_random(bn, num_bytes) gcry_mpi_randomize(bn, num_bytes, GCRY_WEAK_RANDOM) -#endif - -#define MAX_BYTES 18000 - -#define dh_new() av_malloc(sizeof(FF_DH)) - -static FFBigNum dh_generate_key(FF_DH *dh) -{ - int num_bytes; - - num_bytes = bn_num_bytes(dh->p) - 1; - if (num_bytes <= 0 || num_bytes > MAX_BYTES) - return NULL; - - bn_new(dh->priv_key); - if (!dh->priv_key) - return NULL; - bn_random(dh->priv_key, num_bytes); - - bn_new(dh->pub_key); - if (!dh->pub_key) { - bn_free(dh->priv_key); - return NULL; - } - - bn_modexp(dh->pub_key, dh->g, dh->priv_key, dh->p); - - return dh->pub_key; -} - -static int dh_compute_key(FF_DH *dh, FFBigNum pub_key_bn, - uint32_t pub_key_len, uint8_t *secret_key) -{ - FFBigNum k; - int num_bytes; - - num_bytes = bn_num_bytes(dh->p); - if (num_bytes <= 0 || num_bytes > MAX_BYTES) - return -1; - - bn_new(k); - if (!k) - return -1; - - bn_modexp(k, pub_key_bn, dh->priv_key, dh->p); - bn_bn2bin(k, secret_key, pub_key_len); - bn_free(k); - - /* return the length of the shared secret key like DH_compute_key */ - return pub_key_len; -} - -void ff_dh_free(FF_DH *dh) -{ - bn_free(dh->p); - bn_free(dh->g); - bn_free(dh->pub_key); - bn_free(dh->priv_key); - av_free(dh); -} -#elif CONFIG_OPENSSL -#define bn_new(bn) bn = BN_new() -#define bn_free(bn) BN_free(bn) -#define bn_set_word(bn, w) BN_set_word(bn, w) -#define bn_cmp(a, b) BN_cmp(a, b) -#define bn_copy(to, from) BN_copy(to, from) -#define bn_sub_word(bn, w) BN_sub_word(bn, w) -#define bn_cmp_1(bn) BN_cmp(bn, BN_value_one()) -#define bn_num_bytes(bn) BN_num_bytes(bn) -#define bn_bn2bin(bn, buf, len) BN_bn2bin(bn, buf) -#define bn_bin2bn(bn, buf, len) bn = BN_bin2bn(buf, len, 0) -#define bn_hex2bn(bn, buf, ret) ret = BN_hex2bn(&bn, buf) -#define bn_modexp(bn, y, q, p) \ - do { \ - BN_CTX *ctx = BN_CTX_new(); \ - if (!ctx) \ - return AVERROR(ENOMEM); \ - if (!BN_mod_exp(bn, y, q, p, ctx)) { \ - BN_CTX_free(ctx); \ - return AVERROR(EINVAL); \ - } \ - BN_CTX_free(ctx); \ - } while (0) - -#define dh_new() DH_new() -#define dh_generate_key(dh) DH_generate_key(dh) -#define dh_compute_key(dh, pub, len, secret) DH_compute_key(secret, pub, dh) - -void ff_dh_free(FF_DH *dh) -{ - DH_free(dh); -} -#endif - -static int dh_is_valid_public_key(FFBigNum y, FFBigNum p, FFBigNum q) -{ - FFBigNum bn = NULL; - int ret = AVERROR(EINVAL); - - bn_new(bn); - if (!bn) - return AVERROR(ENOMEM); - - /* y must lie in [2, p - 1] */ - bn_set_word(bn, 1); - if (!bn_cmp(y, bn)) - goto fail; - - /* bn = p - 2 */ - bn_copy(bn, p); - bn_sub_word(bn, 1); - if (!bn_cmp(y, bn)) - goto fail; - - /* Verify with Sophie-Germain prime - * - * This is a nice test to make sure the public key position is calculated - * correctly. This test will fail in about 50% of the cases if applied to - * random data. - */ - /* y must fulfill y^q mod p = 1 */ - bn_modexp(bn, y, q, p); - - if (bn_cmp_1(bn)) - goto fail; - - ret = 0; -fail: - bn_free(bn); - - return ret; -} - -av_cold FF_DH *ff_dh_init(int key_len) -{ - FF_DH *dh; - int ret; - - if (!(dh = dh_new())) - return NULL; - - bn_new(dh->g); - if (!dh->g) - goto fail; - - bn_hex2bn(dh->p, P1024, ret); - if (!ret) - goto fail; - - bn_set_word(dh->g, 2); - dh->length = key_len; - - return dh; - -fail: - ff_dh_free(dh); - - return NULL; -} - -int ff_dh_generate_public_key(FF_DH *dh) -{ - int ret = 0; - - while (!ret) { - FFBigNum q1 = NULL; - - if (!dh_generate_key(dh)) - return AVERROR(EINVAL); - - bn_hex2bn(q1, Q1024, ret); - if (!ret) - return AVERROR(ENOMEM); - - ret = dh_is_valid_public_key(dh->pub_key, dh->p, q1); - bn_free(q1); - - if (!ret) { - /* the public key is valid */ - break; - } - } - - return ret; -} - -int ff_dh_write_public_key(FF_DH *dh, uint8_t *pub_key, int pub_key_len) -{ - int len; - - /* compute the length of the public key */ - len = bn_num_bytes(dh->pub_key); - if (len <= 0 || len > pub_key_len) - return AVERROR(EINVAL); - - /* convert the public key value into big-endian form */ - memset(pub_key, 0, pub_key_len); - bn_bn2bin(dh->pub_key, pub_key + pub_key_len - len, len); - - return 0; -} - -int ff_dh_compute_shared_secret_key(FF_DH *dh, const uint8_t *pub_key, - int pub_key_len, uint8_t *secret_key) -{ - FFBigNum q1 = NULL, pub_key_bn = NULL; - int ret; - - /* convert the big-endian form of the public key into a bignum */ - bn_bin2bn(pub_key_bn, pub_key, pub_key_len); - if (!pub_key_bn) - return AVERROR(ENOMEM); - - /* convert the string containing a hexadecimal number into a bignum */ - bn_hex2bn(q1, Q1024, ret); - if (!ret) { - ret = AVERROR(ENOMEM); - goto fail; - } - - /* when the public key is valid we have to compute the shared secret key */ - if ((ret = dh_is_valid_public_key(pub_key_bn, dh->p, q1)) < 0) { - goto fail; - } else if ((ret = dh_compute_key(dh, pub_key_bn, pub_key_len, - secret_key)) < 0) { - ret = AVERROR(EINVAL); - goto fail; - } - -fail: - bn_free(pub_key_bn); - bn_free(q1); - - return ret; -} - |