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137 .IX Title "EVP_PKEY_cmp 3"
138 .TH EVP_PKEY_cmp 3 "2009-07-19" "1.0.1n" "OpenSSL"
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144 EVP_PKEY_copy_parameters, EVP_PKEY_missing_parameters, EVP_PKEY_cmp_parameters, EVP_PKEY_cmp \- public key parameter and comparison functions
148 .IX Header "SYNOPSIS"
150 \& #include <openssl/evp.h>
152 \& int EVP_PKEY_missing_parameters(const EVP_PKEY *pkey);
153 \& int EVP_PKEY_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from);
155 \& int EVP_PKEY_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b);
156 \& int EVP_PKEY_cmp(const EVP_PKEY *a, const EVP_PKEY *b);
159 .IX Header "DESCRIPTION"
160 The function \fIEVP_PKEY_missing_parameters()\fR returns 1 if the public key
161 parameters of \fBpkey\fR are missing and 0 if they are present or the algorithm
162 doesn't use parameters.
164 The function \fIEVP_PKEY_copy_parameters()\fR copies the parameters from key
165 \&\fBfrom\fR to key \fBto\fR.
167 The funcion \fIEVP_PKEY_cmp_parameters()\fR compares the parameters of keys
168 \&\fBa\fR and \fBb\fR.
170 The funcion \fIEVP_PKEY_cmp()\fR compares the public key components and paramters
171 (if present) of keys \fBa\fR and \fBb\fR.
174 The main purpose of the functions \fIEVP_PKEY_missing_parameters()\fR and
175 \&\fIEVP_PKEY_copy_parameters()\fR is to handle public keys in certificates where the
176 parameters are sometimes omitted from a public key if they are inherited from
177 the \s-1CA\s0 that signed it.
179 Since OpenSSL private keys contain public key components too the function
180 \&\fIEVP_PKEY_cmp()\fR can also be used to determine if a private key matches
183 .IX Header "RETURN VALUES"
184 The function \fIEVP_PKEY_missing_parameters()\fR returns 1 if the public key
185 parameters of \fBpkey\fR are missing and 0 if they are present or the algorithm
186 doesn't use parameters.
188 These functions \fIEVP_PKEY_copy_parameters()\fR returns 1 for success and 0 for
191 The function \fIEVP_PKEY_cmp_parameters()\fR and \fIEVP_PKEY_cmp()\fR return 1 if the
192 keys match, 0 if they don't match, \-1 if the key types are different and
193 \&\-2 if the operation is not supported.
195 .IX Header "SEE ALSO"
196 \&\fIEVP_PKEY_CTX_new\fR\|(3),
197 \&\fIEVP_PKEY_keygen\fR\|(3)