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137 .IX Title "EVP_PKEY_CTX_new 3"
138 .TH EVP_PKEY_CTX_new 3 "2009-12-26" "1.0.1n" "OpenSSL"
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144 EVP_PKEY_CTX_new, EVP_PKEY_CTX_new_id, EVP_PKEY_CTX_dup, EVP_PKEY_CTX_free \- public key algorithm context functions.
148 .IX Header "SYNOPSIS"
150 \& #include <openssl/evp.h>
152 \& EVP_PKEY_CTX *EVP_PKEY_CTX_new(EVP_PKEY *pkey, ENGINE *e);
153 \& EVP_PKEY_CTX *EVP_PKEY_CTX_new_id(int id, ENGINE *e);
154 \& EVP_PKEY_CTX *EVP_PKEY_CTX_dup(EVP_PKEY_CTX *ctx);
155 \& void EVP_PKEY_CTX_free(EVP_PKEY_CTX *ctx);
158 .IX Header "DESCRIPTION"
159 The \fIEVP_PKEY_CTX_new()\fR function allocates public key algorithm context using
160 the algorithm specified in \fBpkey\fR and \s-1ENGINE \s0\fBe\fR.
162 The \fIEVP_PKEY_CTX_new_id()\fR function allocates public key algorithm context
163 using the algorithm specified by \fBid\fR and \s-1ENGINE \s0\fBe\fR. It is normally used
164 when no \fB\s-1EVP_PKEY\s0\fR structure is associated with the operations, for example
165 during parameter generation of key genration for some algorithms.
167 \&\fIEVP_PKEY_CTX_dup()\fR duplicates the context \fBctx\fR.
169 \&\fIEVP_PKEY_CTX_free()\fR frees up the context \fBctx\fR.
172 The \fB\s-1EVP_PKEY_CTX\s0\fR structure is an opaque public key algorithm context used
173 by the OpenSSL high level public key \s-1API.\s0 Contexts \fB\s-1MUST NOT\s0\fR be shared between
174 threads: that is it is not permissible to use the same context simultaneously
177 .IX Header "RETURN VALUES"
178 \&\fIEVP_PKEY_CTX_new()\fR, \fIEVP_PKEY_CTX_new_id()\fR, \fIEVP_PKEY_CTX_dup()\fR returns either
179 the newly allocated \fB\s-1EVP_PKEY_CTX\s0\fR structure of \fB\s-1NULL\s0\fR if an error occurred.
181 \&\fIEVP_PKEY_CTX_free()\fR does not return a value.
183 .IX Header "SEE ALSO"
184 \&\fIEVP_PKEY_new\fR\|(3)
187 These functions were first added to OpenSSL 1.0.0.