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SDP attributes defined in

RFC 8122 – Secure connection-oriented media transport sessions over TLS using SDP

RFC 8122 – Section 5  —  see also:  IANA
a=fingerprint

 

attribute  =/
fingerprint-attribute
fingerprint-attribute =
"fingerprint"  ":"  hash-func  SP  fingerprint
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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
; Additional hash functions can only come from updates to RFC 3279
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fingerprint =
2UHEX  *( ":"  2UHEX )
; Each byte in upper-case hex, separated by colons
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UHEX =
DIGIT /  %x41-46
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