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SDP attributes defined in RFC 4572

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secure connection-oriented media transport sessions over TLS using SDP
fingerprint

RFC 4572 – Section 5

IANA Hash Function Textual Names registry

a=fingerprint:   (session- or media-level)


attribute   =/
fingerprint-attribute   =
"fingerprint"   ":"   hash-func   SP   fingerprint

hash-func   =
"md2"  /     ;  see  RFC 3279 – Section 2.1
"md5"  /     ;  see  RFC 3279
"sha-1"  /     ;  see  RFC 3279
"sha-224"  /     ;  see  RFC 4055 – Section 2.1
"sha-256"  /     ;  see  RFC 4055
"sha-384"  /     ;  see  RFC 4055
"sha-512"  /     ;  see  RFC 4055
token

fingerprint   =
2UHEX   *( ":"   2UHEX )

UHEX   =
DIGIT  /  %x41-46