The MAC algorithm used to calculate the request MAC. The value MUST be one of “hmac-sha-1”, “hmac-sha-256”, or a registered extension algorithm name. The authorization server is assumed to know the set of algorithms supported by the client and the resource server. It selects an algorithm that meets the security policies and is supported by both nodes. (Internet Draft ietf-oauth-v2-http-mac: OAuth 2.0 Message Authentication Code (MAC) Tokens)


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