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EVP_PKEY_CTX_dup.3
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It is normally used when no \fB\s-1EVP_PKEY\s0\fR structure is associated with the operations, for example during parameter generation of key genration for some algorithms. .PP \&\fIEVP_PKEY_CTX_dup()\fR duplicates the context \fBctx\fR. .PP \&\fIEVP_PKEY_CTX_free()\fR frees up the context \fBctx\fR. .SH "NOTES" .IX Header "NOTES" The \fB\s-1EVP_PKEY_CTX\s0\fR structure is an opaque public key algorithm context used by the OpenSSL high level public key \s-1API\s0. Contexts \fB\s-1MUST\s0 \s-1NOT\s0\fR be shared between threads: that is it is not permissible to use the same context simultaneously in two threads. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fIEVP_PKEY_CTX_new()\fR, \fIEVP_PKEY_CTX_new_id()\fR, \fIEVP_PKEY_CTX_dup()\fR returns either the newly allocated \fB\s-1EVP_PKEY_CTX\s0\fR structure of \fB\s-1NULL\s0\fR if an error occurred. .PP \&\fIEVP_PKEY_CTX_free()\fR does not return a value. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fIEVP_PKEY_new\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" These functions were first added to OpenSSL 1.0.0.