2018-10-24 19:20:00 +00:00
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=pod
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=head1 NAME
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EVP_MAC_HMAC - The HMAC EVP_MAC implementation
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=head1 DESCRIPTION
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Support for computing HMAC MACs through the B<EVP_MAC> API.
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=head2 Numeric identity
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B<EVP_MAC_HMAC> is the numeric identity for this implementation, and
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can be used in functions like EVP_MAC_CTX_new_id() and
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EVP_get_macbynid().
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=head2 Supported controls
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The supported controls are:
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=over 4
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=item B<EVP_MAC_CTRL_SET_KEY>
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2018-11-02 09:11:55 +00:00
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EVP_MAC_ctrl_str() takes two type strings for this control:
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2018-10-24 19:20:00 +00:00
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=over 4
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=item "key"
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The value string is used as is.
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=item "hexkey"
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The value string is expected to be a hexadecimal number, which will be
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decoded before passing on as control value.
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=back
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=item B<EVP_MAC_CTRL_SET_FLAGS>
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Sets HMAC flags. This is passed directly to HMAC_CTX_set_flags().
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There are no corresponding string control types.
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=item B<EVP_MAC_CTRL_SET_ENGINE>
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=item B<EVP_MAC_CTRL_SET_MD>
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These work as described in L<EVP_MAC(3)/CONTROLS>.
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EVP_MAC_ctrl_str() type string for B<EVP_MAC_CTRL_SET_DIGEST>: "digest"
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The value is expected to be the name of a cipher.
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=back
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=head1 SEE ALSO
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L<EVP_MAC_ctrl(3)>, L<EVP_MAC(3)/CONTROLS>
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=head1 COPYRIGHT
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Copyright 2018 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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