EVP_PKEY_CTX_new.3ssl - Man Page

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 generation for some algorithms.

EVP_PKEY_CTX_dup() duplicates the context ctx.

EVP_PKEY_CTX_free() frees up the context ctx. If ctx is NULL, nothing is done.


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 added in OpenSSL 1.0.0.

Referenced By

Ed25519.7ssl(7), EVP_PKEY_cmp.3ssl(3), EVP_PKEY_CTX_ctrl.3ssl(3), EVP_PKEY_CTX_set1_pbe_pass.3ssl(3), EVP_PKEY_CTX_set_hkdf_md.3ssl(3), EVP_PKEY_CTX_set_rsa_pss_keygen_md.3ssl(3), EVP_PKEY_CTX_set_scrypt_N.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_get_default_digest_nid.3ssl(3), EVP_PKEY_keygen.3ssl(3), EVP_PKEY_meth_new.3ssl(3), EVP_PKEY_print_private.3ssl(3), EVP_PKEY_sign.3ssl(3), EVP_PKEY_verify.3ssl(3), EVP_PKEY_verify_recover.3ssl(3), RSA-PSS.7ssl(7), scrypt.7ssl(7), SM2.7ssl(7), X25519.7ssl(7).

The man pages EVP_PKEY_CTX_dup.3ssl(3), EVP_PKEY_CTX_free.3ssl(3) and EVP_PKEY_CTX_new_id.3ssl(3) are aliases of EVP_PKEY_CTX_new.3ssl(3).

2020-06-22 1.1.1g OpenSSL