EVP_PKEY_CTX_free (3)

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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 e.

The EVP_PKEY_CTX_new_id() function allocates public key algorithm context using the algorithm specified by id and

e. It is normally used when no 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 structure is an opaque public key algorithm context used by the OpenSSL high level public key Contexts 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 structure of 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.