128 lines
5.5 KiB
Text
128 lines
5.5 KiB
Text
=pod
|
|
|
|
=head1 NAME
|
|
|
|
EVP_PKEY_ctrl, EVP_PKEY_ctrl_str - algorithm specific control operations
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/evp.h>
|
|
|
|
int EVP_PKEY_CTX_ctrl(EVP_PKEY_CTX *ctx, int keytype, int optype,
|
|
int cmd, int p1, void *p2);
|
|
int EVP_PKEY_CTX_ctrl_str(EVP_PKEY_CTX *ctx, const char *type,
|
|
const char *value);
|
|
|
|
int EVP_PKEY_get_default_digest_nid(EVP_PKEY *pkey, int *pnid);
|
|
|
|
#include <openssl/rsa.h>
|
|
|
|
int EVP_PKEY_CTX_set_signature_md(EVP_PKEY_CTX *ctx, const EVP_MD *md);
|
|
|
|
int EVP_PKEY_CTX_set_rsa_padding(EVP_PKEY_CTX *ctx, int pad);
|
|
int EVP_PKEY_CTX_set_rsa_pss_saltlen(EVP_PKEY_CTX *ctx, int len);
|
|
int EVP_PKEY_CTX_set_rsa_rsa_keygen_bits(EVP_PKEY_CTX *ctx, int mbits);
|
|
int EVP_PKEY_CTX_set_rsa_keygen_pubexp(EVP_PKEY_CTX *ctx, BIGNUM *pubexp);
|
|
|
|
#include <openssl/dsa.h>
|
|
int EVP_PKEY_CTX_set_dsa_paramgen_bits(EVP_PKEY_CTX *ctx, int nbits);
|
|
|
|
#include <openssl/dh.h>
|
|
int EVP_PKEY_CTX_set_dh_paramgen_prime_len(EVP_PKEY_CTX *ctx, int len);
|
|
int EVP_PKEY_CTX_set_dh_paramgen_generator(EVP_PKEY_CTX *ctx, int gen);
|
|
|
|
#include <openssl/ec.h>
|
|
int EVP_PKEY_CTX_set_ec_paramgen_curve_nid(EVP_PKEY_CTX *ctx, int nid);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
The function EVP_PKEY_CTX_ctrl() sends a control operation to the context
|
|
B<ctx>. The key type used must match B<keytype> if it is not -1. The parameter
|
|
B<optype> is a mask indicating which operations the control can be applied to.
|
|
The control command is indicated in B<cmd> and any additional arguments in
|
|
B<p1> and B<p2>.
|
|
|
|
Applications will not normally call EVP_PKEY_CTX_ctrl() directly but will
|
|
instead call one of the algorithm specific macros below.
|
|
|
|
The function EVP_PKEY_ctrl_str() allows an application to send an algorithm
|
|
specific control operation to a context B<ctx> in string form. This is
|
|
intended to be used for options specified on the command line or in text
|
|
files. The commands supported are documented in the openssl utility
|
|
command line pages for the option B<-pkeyopt> which is supported by the
|
|
B<pkeyutl>, B<genpkey> and B<req> commands.
|
|
|
|
All the remaining "functions" are implemented as macros.
|
|
|
|
The EVP_PKEY_CTX_set_signature_md() macro sets the message digest type used
|
|
in a signature. It can be used with any public key algorithm supporting
|
|
signature operations.
|
|
|
|
The macro EVP_PKEY_CTX_set_rsa_padding() sets the RSA padding mode for B<ctx>.
|
|
The B<pad> parameter can take the value RSA_PKCS1_PADDING for PKCS#1 padding,
|
|
RSA_SSLV23_PADDING for SSLv23 padding, RSA_NO_PADDING for no padding,
|
|
RSA_PKCS1_OAEP_PADDING for OAEP padding (encrypt and decrypt only),
|
|
RSA_X931_PADDING for X9.31 padding (signature operations only) and
|
|
RSA_PKCS1_PSS_PADDING (sign and verify only).
|
|
|
|
Two RSA padding modes behave differently if EVP_PKEY_CTX_set_signature_md()
|
|
is used. If this macro is called for PKCS#1 padding the plaintext buffer is
|
|
an actual digest value and is encapsulated in a DigestInfo structure according
|
|
to PKCS#1 when signing and this structure is expected (and stripped off) when
|
|
verifying. If this control is not used with RSA and PKCS#1 padding then the
|
|
supplied data is used directly and not encapsulated. In the case of X9.31
|
|
padding for RSA the algorithm identifier byte is added or checked and removed
|
|
if this control is called. If it is not called then the first byte of the plaintext buffer is expected to be the algorithm identifier byte.
|
|
|
|
The EVP_PKEY_CTX_set_rsa_pss_saltlen() macro sets the RSA PSS salt length to
|
|
B<len> as its name implies it is only supported for PSS padding. Two special
|
|
values are supported: -1 sets the salt length to the digest length. When
|
|
signing -2 sets the salt length to the maximum permissible value. When
|
|
verifying -2 causes the salt length to be automatically determined based on the
|
|
B<PSS> block structure. If this macro is not called a salt length value of -2
|
|
is used by default.
|
|
|
|
The EVP_PKEY_CTX_set_rsa_rsa_keygen_bits() macro sets the RSA key length for
|
|
RSA key genration to B<bits>. If not specified 1024 bits is used.
|
|
|
|
The EVP_PKEY_CTX_set_rsa_keygen_pubexp() macro sets the public exponent value
|
|
for RSA key generation to B<pubexp> currently it should be an odd integer. The
|
|
B<pubexp> pointer is used internally by this function so it should not be
|
|
modified or free after the call. If this macro is not called then 65537 is used.
|
|
|
|
The macro EVP_PKEY_CTX_set_dsa_paramgen_bits() sets the number of bits used
|
|
for DSA parameter generation to B<bits>. If not specified 1024 is used.
|
|
|
|
The macro EVP_PKEY_CTX_set_dh_paramgen_prime_len() sets the length of the DH
|
|
prime parameter B<p> for DH parameter generation. If this macro is not called
|
|
then 1024 is used.
|
|
|
|
The EVP_PKEY_CTX_set_dh_paramgen_generator() macro sets DH generator to B<gen>
|
|
for DH parameter generation. If not specified 2 is used.
|
|
|
|
The EVP_PKEY_CTX_set_ec_paramgen_curve_nid() sets the EC curve for EC parameter
|
|
generation to B<nid>. For EC parameter generation this macro must be called
|
|
or an error occurs because there is no default curve.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
EVP_PKEY_CTX_ctrl() and its macros return a positive value for success and 0
|
|
or a negative value for failure. In particular a return value of -2
|
|
indicates the operation is not supported by the public key algorithm.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<EVP_PKEY_CTX_new(3)|EVP_PKEY_CTX_new(3)>,
|
|
L<EVP_PKEY_encrypt(3)|EVP_PKEY_encrypt(3)>,
|
|
L<EVP_PKEY_decrypt(3)|EVP_PKEY_decrypt(3)>,
|
|
L<EVP_PKEY_sign(3)|EVP_PKEY_sign(3)>,
|
|
L<EVP_PKEY_verify(3)|EVP_PKEY_verify(3)>,
|
|
L<EVP_PKEY_verifyrecover(3)|EVP_PKEY_verifyrecover(3)>,
|
|
L<EVP_PKEY_derive(3)|EVP_PKEY_derive(3)>
|
|
L<EVP_PKEY_keygen(3)|EVP_PKEY_keygen(3)>
|
|
|
|
=head1 HISTORY
|
|
|
|
These functions were first added to OpenSSL 1.0.0.
|
|
|
|
=cut
|