http://www.rfc-editor.org/rfc/rfc2857.txt
RFC 2857: The Use of HMAC-RIPEMD-160-96 within ESP and AH, A. Keromytis, N. Provos2000-06-01T23:00:00-00:00This memo describes the use of the HMAC algorithm in conjunction with the RIPEMD-160 algorithm as an authentication mechanism within the revised IPSEC Encapsulating Security Payload (ESP) and the revised IPSEC Authentication Header (AH). [STANDARDS-TRACK]