EVP_PKEY_CTX_new.3ssl man page

EVP_PKEY_CTX_new, EVP_PKEY_CTX_new_id, EVP_PKEY_CTX_dup, EVP_PKEY_CTX_free ā€” public key algorithm context functions.


 #include <openssl/evp.h>

 EVP_PKEY_CTX *EVP_PKEY_CTX_new_id(int id, ENGINE *e);
 void EVP_PKEY_CTX_free(EVP_PKEY_CTX *ctx);


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.


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



These functions were first added to OpenSSL 1.0.0.

Referenced By

EVP_PKEY_cmp.3ssl(3), EVP_PKEY_CTX_ctrl.3ssl(3), EVP_PKEY_CTX_set_hkdf_md.3ssl(3), EVP_PKEY_CTX_set_tls1_prf_md.3ssl(3), EVP_PKEY_decrypt.3ssl(3), EVP_PKEY_derive.3ssl(3), EVP_PKEY_encrypt.3ssl(3), EVP_PKEY_get_default_digest.3ssl(3), EVP_PKEY_keygen.3ssl(3), EVP_PKEY_print_private.3ssl(3), EVP_PKEY_sign.3ssl(3), EVP_PKEY_verify.3ssl(3), EVP_PKEY_verify_recover.3ssl(3).

2016-09-26 1.0.2j OpenSSL