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Purpose A dkim_alg_t is a value from an enumerated list of the possible message signing algorithms available. It is passed as a parameter to dkim_sign() when selecting a signing algorithm to be used to sign a message. It need not be passed to dkim_verify() as that function will determine the signing algorithm for verification based on the signature on an arriving message.
Possible Values
  • DKIM_SIGN_RSASHA1 -- use an RSA-signed SHA1 hash of the message's headers and body
  • DKIM_SIGN_RSASHA256 -- use an RSA-signed SHA256 hash of the message's headers and body
  • DKIM_SIGN_RSASHA256 is only available if the OpenSSL available at compile-time supported the SHA256 algorithm.

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