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136 .IX Title "EVP_PKEY_cmp 3"
137 .TH EVP_PKEY_cmp 3 "2006-07-09" "1.1.0-dev" "OpenSSL"
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143 EVP_PKEY_copy_parameters, EVP_PKEY_missing_parameters, EVP_PKEY_cmp_parameters, EVP_PKEY_cmp \- public key parameter and comparison functions
147 .IX Header "SYNOPSIS"
149 \& #include <openssl/evp.h>
151 \& int EVP_PKEY_missing_parameters(const EVP_PKEY *pkey);
152 \& int EVP_PKEY_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from);
154 \& int EVP_PKEY_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b);
155 \& int EVP_PKEY_cmp(const EVP_PKEY *a, const EVP_PKEY *b);
158 .IX Header "DESCRIPTION"
159 The function \fIEVP_PKEY_missing_parameters()\fR returns 1 if the public key
160 parameters of \fBpkey\fR are missing and 0 if they are present or the algorithm
161 doesn't use parameters.
163 The function \fIEVP_PKEY_copy_parameters()\fR copies the parameters from key
164 \&\fBfrom\fR to key \fBto\fR.
166 The funcion \fIEVP_PKEY_cmp_parameters()\fR compares the parameters of keys
167 \&\fBa\fR and \fBb\fR.
169 The funcion \fIEVP_PKEY_cmp()\fR compares the public key components and paramters
170 (if present) of keys \fBa\fR and \fBb\fR.
173 The main purpose of the functions \fIEVP_PKEY_missing_parameters()\fR and
174 \&\fIEVP_PKEY_copy_parameters()\fR is to handle public keys in certificates where the
175 parameters are sometimes omitted from a public key if they are inherited from
176 the \s-1CA\s0 that signed it.
178 Since OpenSSL private keys contain public key components too the function
179 \&\fIEVP_PKEY_cmp()\fR can also be used to determine if a private key matches
182 .IX Header "RETURN VALUES"
183 The function \fIEVP_PKEY_missing_parameters()\fR returns 1 if the public key
184 parameters of \fBpkey\fR are missing and 0 if they are present or the algorithm
185 doesn't use parameters.
187 These functions \fIEVP_PKEY_copy_parameters()\fR returns 1 for success and 0 for
190 The function \fIEVP_PKEY_cmp_parameters()\fR and \fIEVP_PKEY_cmp()\fR return 1 if the
191 keys match, 0 if they don't match, \-1 if the key types are different and
192 \&\-2 if the operation is not supported.
194 .IX Header "SEE ALSO"
195 \&\fIEVP_PKEY_CTX_new\fR\|(3),
196 \&\fIEVP_PKEY_keygen\fR\|(3)