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