# dkim_alg_t

DESCRIPTION |
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
NOTES | `DKIM_SIGN_RSASHA256` is only available if the OpenSSL available at compile-time supported the SHA256 algorithm.

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