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doc/man3/EVP_PKEY_fromdata.pod

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+=pod
+
+=head1 NAME
+
+EVP_PKEY_param_fromdata_init, EVP_PKEY_key_fromdata_init, EVP_PKEY_fromdata,
+EVP_PKEY_param_fromdata_settable, EVP_PKEY_key_fromdata_settable
+- functions to create domain parameters and keys from user data
+
+=head1 SYNOPSIS
+
+ #include <openssl/evp.h>
+
+ int EVP_PKEY_param_fromdata_init(EVP_PKEY_CTX *ctx);
+ int EVP_PKEY_key_fromdata_init(EVP_PKEY_CTX *ctx);
+ int EVP_PKEY_fromdata(EVP_PKEY_CTX *ctx, EVP_PKEY **ppkey, OSSL_PARAM params[]);
+ const OSSL_PARAM *EVP_PKEY_param_fromdata_settable(EVP_PKEY_CTX *ctx);
+ const OSSL_PARAM *EVP_PKEY_key_fromdata_settable(EVP_PKEY_CTX *ctx);
+
+=head1 DESCRIPTION
+
+EVP_PKEY_param_fromdata_init() initializes a public key algorithm context
+for creating domain parameters from user data.
+
+EVP_PKEY_key_fromdata_init() initializes a public key algorithm context for
+creating a key from user data.
+
+EVP_PKEY_fromdata() creates domain parameters or a key, given data from
+I<params> and a context that's been initialized with
+EVP_PKEY_param_fromdata_init() or EVP_PKEY_key_fromdata_init().  The result is
+written to I<*ppkey>.
+
+EVP_PKEY_param_fromdata_settable() and EVP_PKEY_key_fromdata_settable()
+get a constant B<OSSL_PARAM> array that describes the settable parameters
+that can be used with EVP_PKEY_fromdata().
+See L<OSSL_PARAM(3)> for the use of B<OSSL_PARAM> as parameter descriptor.
+
+=head1 NOTES
+
+These functions only work with key management methods coming from a
+provider.
+
+=for comment We may choose to make this available for legacy methods too... 
+
+=head1 RETURN VALUES
+
+EVP_PKEY_key_fromdata_init(), EVP_PKEY_param_fromdata_init() and
+EVP_PKEY_fromdata() return 1 for success and 0 or a negative value for
+failure.  In particular a return value of -2 indicates the operation is
+not supported by the public key algorithm.
+
+=head1 SEE ALSO
+
+L<EVP_PKEY_CTX_new(3)>, L<provider(7)>
+
+=head1 HISTORY
+
+These functions were added in OpenSSL 3.0.
+
+=head1 COPYRIGHT
+
+Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
+
+Licensed under the Apache License 2.0 (the "License").  You may not use
+this file except in compliance with the License.  You can obtain a copy
+in the file LICENSE in the source distribution or at
+L<https://www.openssl.org/source/license.html>.
+
+=cut
+