# dkim_alg_t

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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.

Copyright (c) 2005-2007 Sendmail, Inc. and its suppliers. All rights reserved.
Copyright (c) 2009, 2010, The OpenDKIM Project. All rights reserved.
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