| =pod |
| |
| =head1 NAME |
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| EVP_PKEY_CTX_new, EVP_PKEY_CTX_new_id, EVP_PKEY_CTX_dup, EVP_PKEY_CTX_free - public key algorithm context functions. |
| |
| =head1 SYNOPSIS |
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| #include <openssl/evp.h> |
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| 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); |
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| =head1 DESCRIPTION |
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| The EVP_PKEY_CTX_new() function allocates public key algorithm context using |
| the algorithm specified in B<pkey> and ENGINE B<e>. |
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| The EVP_PKEY_CTX_new_id() function allocates public key algorithm context |
| using the algorithm specified by B<id> and ENGINE B<e>. It is normally used |
| when no B<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 B<ctx>. |
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| EVP_PKEY_CTX_free() frees up the context B<ctx>. |
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| =head1 NOTES |
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| The B<EVP_PKEY_CTX> structure is an opaque public key algorithm context used |
| by the OpenSSL high level public key API. Contexts B<MUST NOT> be shared between |
| threads: that is it is not permissible to use the same context simultaneously |
| in two threads. |
| |
| =head1 RETURN VALUES |
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| EVP_PKEY_CTX_new(), EVP_PKEY_CTX_new_id(), EVP_PKEY_CTX_dup() returns either |
| the newly allocated B<EVP_PKEY_CTX> structure of B<NULL> if an error occurred. |
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| EVP_PKEY_CTX_free() does not return a value. |
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| =head1 SEE ALSO |
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| L<EVP_PKEY_new(3)|EVP_PKEY_new(3)> |
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| =head1 HISTORY |
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| These functions were first added to OpenSSL 1.0.0. |
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| =cut |
