What's the use of libsrtp?

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Description

Libsrtp is mainly used to encrypt rtp/rtcp; you can also encrypt any text. Note that the bytes of the previous rtp_ protocol are not encrypted; it is no different from AES encryption.

Source code compilation

Cd / home/fengyuzaitu

Wget https://github.com/cisco/libsrtp/archive/master.zip.

Unzip master.zip

Cd libsrtp-master

. / configure

Make

Make runtest

Make install

Refer to the documentation in the source code: libsrtp.pdf

1.7 Example Code

The example is very practical, but there is no error checking. Suppose that * * c has been correctly assigned in the sent data stream, and get_rtp_packet and send_srtp_packet () can be used.

Get_rtp_packet saves the RTP package to the cache, returns the specific length, and the last one sends out the data in the cache. Srtp_protect is responsible for data encryption.

Srtp_t session

Srtp_policy_t policy

Uint8_t key [30]

/ / initialize libSRTP

Srtp_init ()

/ / set policy to describe a policy for an SRTP stream

Crypto_policy_set_rtp_default & policy.rtp)

Crypto_policy_set_rtcp_default & policy.rtcp)

Policy.***c = * * c

Policy.key = key

Policy.next = NULL

/ / set key to random value

Crypto_get_random (key, 30)

/ / allocate and initialize the SRTP session

Srtp_create (& session, policy)

/ / main loop: get rtp packets, send srtp packets

While (1) {

Char rtp_buffer [2048]

Unsigned len

Len = get_rtp_packet (rtp_buffer)

Srtp_protect (session, rtp_buffer, & len)

Send_srtp_packet (rtp_buffer, len)

}

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