/usr/man/cat.3/EVP_PKEY_CTX_dup.3(/usr/man/cat.3/EVP_PKEY_CTX_dup.3)

EVP_PKEY_CTX_new(3)          OpenSSL          EVP_PKEY_CTX_new(3)

NAME

     EVP_PKEY_CTX_new, EVP_PKEY_CTX_new_id, EVP_PKEY_CTX_dup,
     EVP_PKEY_CTX_free - public key algorithm context functions.

SYNOPSIS

      #include <openssl/evp.h>

      EVP_PKEY_CTX *EVP_PKEY_CTX_new(EVP_PKEY *pkey, ENGINE *e);
      EVP_PKEY_CTX *EVP_PKEY_CTX_new_id(int id, ENGINE *e);
      EVP_PKEY_CTX *EVP_PKEY_CTX_dup(EVP_PKEY_CTX *ctx);
      void EVP_PKEY_CTX_free(EVP_PKEY_CTX *ctx);

DESCRIPTION

     The EVP_PKEY_CTX_new() function allocates public key
     algorithm context using the algorithm specified in pkey and
     ENGINE e.

     The EVP_PKEY_CTX_new_id() function allocates public key
     algorithm context using the algorithm specified by id and
     ENGINE e. It is normally used when no EVP_PKEY structure is
     associated with the operations, for example during parameter
     generation of key genration for some algorithms.

     EVP_PKEY_CTX_dup() duplicates the context ctx.

     EVP_PKEY_CTX_free() frees up the context ctx.

NOTES

     The EVP_PKEY_CTX structure is an opaque public key algorithm
     context used by the OpenSSL high level public key API.
     Contexts MUST NOT be shared between threads: that is it is
     not permissible to use the same context simultaneously in
     two threads.

RETURN VALUES

     EVP_PKEY_CTX_new(), EVP_PKEY_CTX_new_id(),
     EVP_PKEY_CTX_dup() returns either the newly allocated
     EVP_PKEY_CTX structure of NULL if an error occurred.

     EVP_PKEY_CTX_free() does not return a value.

SEE ALSO

     EVP_PKEY_new(3)

HISTORY

     These functions were first added to OpenSSL 1.0.0.

1.0.2t               Last change: 2019-09-10                    1

See also EVP_PKEY_CTX_free(3)
See also EVP_PKEY_CTX_new(3)
See also EVP_PKEY_CTX_new_id(3)