1/* 2 * This file is part of FFmpeg. 3 * 4 * FFmpeg is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Lesser General Public 6 * License as published by the Free Software Foundation; either 7 * version 2.1 of the License, or (at your option) any later version. 8 * 9 * FFmpeg is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * Lesser General Public License for more details. 13 * 14 * You should have received a copy of the GNU Lesser General Public 15 * License along with FFmpeg; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 19#include <stdint.h> 20#include <stdio.h> 21#include <string.h> 22 23#include "libavformat/rtpdec.h" 24#include "libavformat/srtp.h" 25 26static const char *aes128_80_key = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmn"; 27 28static const uint8_t rtp_aes128_80[] = { 29 // RTP header 30 0x80, 0xe0, 0x12, 0x34, 0x12, 0x34, 0x56, 0x78, 0x12, 0x34, 0x56, 0x78, 31 // encrypted payload 32 0x62, 0x69, 0x76, 0xca, 0xc5, 33 // HMAC 34 0xa1, 0xac, 0x1b, 0xb4, 0xa0, 0x1c, 0xd5, 0x49, 0x28, 0x99, 35}; 36 37static const uint8_t rtcp_aes128_80[] = { 38 // RTCP header 39 0x81, 0xc9, 0x00, 0x07, 0x12, 0x34, 0x56, 0x78, 40 // encrypted payload 41 0x8a, 0xac, 0xdc, 0xa5, 0x4c, 0xf6, 0x78, 0xa6, 0x62, 0x8f, 0x24, 0xda, 42 0x6c, 0x09, 0x3f, 0xa9, 0x28, 0x7a, 0xb5, 0x7f, 0x1f, 0x0f, 0xc9, 0x35, 43 // RTCP index 44 0x80, 0x00, 0x00, 0x03, 45 // HMAC 46 0xe9, 0x3b, 0xc0, 0x5c, 0x0c, 0x06, 0x9f, 0xab, 0xc0, 0xde, 47}; 48 49static const char *aes128_32_key = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmn"; 50 51static const uint8_t rtp_aes128_32[] = { 52 // RTP header 53 0x80, 0xe0, 0x12, 0x34, 0x12, 0x34, 0x56, 0x78, 0x12, 0x34, 0x56, 0x78, 54 // encrypted payload 55 0x62, 0x69, 0x76, 0xca, 0xc5, 56 // HMAC 57 0xa1, 0xac, 0x1b, 0xb4, 58}; 59 60static const uint8_t rtcp_aes128_32[] = { 61 // RTCP header 62 0x81, 0xc9, 0x00, 0x07, 0x12, 0x34, 0x56, 0x78, 63 // encrypted payload 64 0x35, 0xe9, 0xb5, 0xff, 0x0d, 0xd1, 0xde, 0x70, 0x74, 0x10, 0xaa, 0x1b, 65 0xb2, 0x8d, 0xf0, 0x20, 0x02, 0x99, 0x6b, 0x1b, 0x0b, 0xd0, 0x47, 0x34, 66 // RTCP index 67 0x80, 0x00, 0x00, 0x04, 68 // HMAC 69 0x5b, 0xd2, 0xa9, 0x9d, 70}; 71 72static const char *aes128_80_32_key = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmn"; 73 74static const uint8_t rtp_aes128_80_32[] = { 75 // RTP header 76 0x80, 0xe0, 0x12, 0x34, 0x12, 0x34, 0x56, 0x78, 0x12, 0x34, 0x56, 0x78, 77 // encrypted payload 78 0x62, 0x69, 0x76, 0xca, 0xc5, 79 // HMAC 80 0xa1, 0xac, 0x1b, 0xb4, 81}; 82 83static const uint8_t rtcp_aes128_80_32[] = { 84 // RTCP header 85 0x81, 0xc9, 0x00, 0x07, 0x12, 0x34, 0x56, 0x78, 86 // encrypted payload 87 0xd6, 0xae, 0xc1, 0x58, 0x63, 0x70, 0xc9, 0x88, 0x66, 0x26, 0x1c, 0x53, 88 0xff, 0x5d, 0x5d, 0x2b, 0x0f, 0x8c, 0x72, 0x3e, 0xc9, 0x1d, 0x43, 0xf9, 89 // RTCP index 90 0x80, 0x00, 0x00, 0x05, 91 // HMAC 92 0x09, 0x16, 0xb4, 0x27, 0x9a, 0xe9, 0x92, 0x26, 0x4e, 0x10, 93}; 94 95static void print_data(const uint8_t *buf, int len) 96{ 97 int i; 98 for (i = 0; i < len; i++) 99 printf("%02x", buf[i]); 100 printf("\n"); 101} 102 103static int test_decrypt(struct SRTPContext *srtp, const uint8_t *in, int len, 104 uint8_t *out) 105{ 106 memcpy(out, in, len); 107 if (!ff_srtp_decrypt(srtp, out, &len)) { 108 print_data(out, len); 109 return len; 110 } else 111 return -1; 112} 113 114static void test_encrypt(const uint8_t *data, int in_len, const char *suite, 115 const char *key) 116{ 117 struct SRTPContext enc = { 0 }, dec = { 0 }; 118 int len; 119 char buf[RTP_MAX_PACKET_LENGTH]; 120 ff_srtp_set_crypto(&enc, suite, key); 121 ff_srtp_set_crypto(&dec, suite, key); 122 len = ff_srtp_encrypt(&enc, data, in_len, buf, sizeof(buf)); 123 if (!ff_srtp_decrypt(&dec, buf, &len)) { 124 if (len == in_len && !memcmp(buf, data, len)) 125 printf("Decrypted content matches input\n"); 126 else 127 printf("Decrypted content doesn't match input\n"); 128 } else { 129 printf("Decryption failed\n"); 130 } 131 ff_srtp_free(&enc); 132 ff_srtp_free(&dec); 133} 134 135int main(void) 136{ 137 static const char *aes128_80_suite = "AES_CM_128_HMAC_SHA1_80"; 138 static const char *aes128_32_suite = "AES_CM_128_HMAC_SHA1_32"; 139 static const char *aes128_80_32_suite = "SRTP_AES128_CM_HMAC_SHA1_32"; 140 static const char *test_key = "abcdefghijklmnopqrstuvwxyz1234567890ABCD"; 141 uint8_t buf[RTP_MAX_PACKET_LENGTH]; 142 struct SRTPContext srtp = { 0 }; 143 int len; 144 ff_srtp_set_crypto(&srtp, aes128_80_suite, aes128_80_key); 145 len = test_decrypt(&srtp, rtp_aes128_80, sizeof(rtp_aes128_80), buf); 146 test_encrypt(buf, len, aes128_80_suite, test_key); 147 test_encrypt(buf, len, aes128_32_suite, test_key); 148 test_encrypt(buf, len, aes128_80_32_suite, test_key); 149 test_decrypt(&srtp, rtcp_aes128_80, sizeof(rtcp_aes128_80), buf); 150 test_encrypt(buf, len, aes128_80_suite, test_key); 151 test_encrypt(buf, len, aes128_32_suite, test_key); 152 test_encrypt(buf, len, aes128_80_32_suite, test_key); 153 ff_srtp_free(&srtp); 154 155 memset(&srtp, 0, sizeof(srtp)); // Clear the context 156 ff_srtp_set_crypto(&srtp, aes128_32_suite, aes128_32_key); 157 test_decrypt(&srtp, rtp_aes128_32, sizeof(rtp_aes128_32), buf); 158 test_decrypt(&srtp, rtcp_aes128_32, sizeof(rtcp_aes128_32), buf); 159 ff_srtp_free(&srtp); 160 161 memset(&srtp, 0, sizeof(srtp)); // Clear the context 162 ff_srtp_set_crypto(&srtp, aes128_80_32_suite, aes128_80_32_key); 163 test_decrypt(&srtp, rtp_aes128_80_32, sizeof(rtp_aes128_80_32), buf); 164 test_decrypt(&srtp, rtcp_aes128_80_32, sizeof(rtcp_aes128_80_32), buf); 165 ff_srtp_free(&srtp); 166 return 0; 167} 168