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Hakase
2018-11-01 00:59:10 +09:00
parent 95369e3f0a
commit 35dea6db7e
107 changed files with 4513 additions and 1163 deletions
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doc/man3/EVP_PKEY_CTX_ctrl.pod
+263 -20
View File
@@ -4,20 +4,55 @@
EVP_PKEY_CTX_ctrl,
EVP_PKEY_CTX_ctrl_str,
EVP_PKEY_CTX_ctrl_uint64,
EVP_PKEY_CTX_md,
EVP_PKEY_CTX_set_signature_md,
EVP_PKEY_CTX_get_signature_md,
EVP_PKEY_CTX_set_mac_key,
EVP_PKEY_CTX_set_rsa_padding,
EVP_PKEY_CTX_get_rsa_padding,
EVP_PKEY_CTX_set_rsa_pss_saltlen,
EVP_PKEY_CTX_get_rsa_pss_saltlen,
EVP_PKEY_CTX_set_rsa_keygen_bits,
EVP_PKEY_CTX_set_rsa_keygen_pubexp,
EVP_PKEY_CTX_set_rsa_keygen_primes,
EVP_PKEY_CTX_set_rsa_mgf1_md,
EVP_PKEY_CTX_get_rsa_mgf1_md,
EVP_PKEY_CTX_set_rsa_oaep_md,
EVP_PKEY_CTX_get_rsa_oaep_md,
EVP_PKEY_CTX_set0_rsa_oaep_label,
EVP_PKEY_CTX_get0_rsa_oaep_label,
EVP_PKEY_CTX_set_dsa_paramgen_bits,
EVP_PKEY_CTX_set_dh_paramgen_prime_len,
EVP_PKEY_CTX_set_dh_paramgen_subprime_len,
EVP_PKEY_CTX_set_dh_paramgen_generator,
EVP_PKEY_CTX_set_dh_paramgen_type,
EVP_PKEY_CTX_set_dh_rfc5114,
EVP_PKEY_CTX_set_dhx_rfc5114,
EVP_PKEY_CTX_set_dh_pad,
EVP_PKEY_CTX_set_dh_nid,
EVP_PKEY_CTX_set_dh_kdf_type,
EVP_PKEY_CTX_get_dh_kdf_type,
EVP_PKEY_CTX_set0_dh_kdf_oid,
EVP_PKEY_CTX_get0_dh_kdf_oid,
EVP_PKEY_CTX_set_dh_kdf_md,
EVP_PKEY_CTX_get_dh_kdf_md,
EVP_PKEY_CTX_set_dh_kdf_outlen,
EVP_PKEY_CTX_get_dh_kdf_outlen,
EVP_PKEY_CTX_set0_dh_kdf_ukm,
EVP_PKEY_CTX_get0_dh_kdf_ukm,
EVP_PKEY_CTX_set_ec_paramgen_curve_nid,
EVP_PKEY_CTX_set_ec_param_enc,
EVP_PKEY_CTX_set_ecdh_cofactor_mode,
EVP_PKEY_CTX_get_ecdh_cofactor_mode,
EVP_PKEY_CTX_set_ecdh_kdf_type,
EVP_PKEY_CTX_get_ecdh_kdf_type,
EVP_PKEY_CTX_set_ecdh_kdf_md,
EVP_PKEY_CTX_get_ecdh_kdf_md,
EVP_PKEY_CTX_set_ecdh_kdf_outlen,
EVP_PKEY_CTX_get_ecdh_kdf_outlen,
EVP_PKEY_CTX_set0_ecdh_kdf_ukm,
EVP_PKEY_CTX_get0_ecdh_kdf_ukm,
EVP_PKEY_CTX_set1_id, EVP_PKEY_CTX_get1_id, EVP_PKEY_CTX_get1_id_len
- algorithm specific control operations
@@ -27,9 +62,13 @@ EVP_PKEY_CTX_set1_id, EVP_PKEY_CTX_get1_id, EVP_PKEY_CTX_get1_id_len
int EVP_PKEY_CTX_ctrl(EVP_PKEY_CTX *ctx, int keytype, int optype,
int cmd, int p1, void *p2);
int EVP_PKEY_CTX_ctrl_uint64(EVP_PKEY_CTX *ctx, int keytype, int optype,
int cmd, uint64_t value);
int EVP_PKEY_CTX_ctrl_str(EVP_PKEY_CTX *ctx, const char *type,
const char *value);
int EVP_PKEY_CTX_md(EVP_PKEY_CTX *ctx, int optype, int cmd, const char *md);
int EVP_PKEY_CTX_set_signature_md(EVP_PKEY_CTX *ctx, const EVP_MD *md);
int EVP_PKEY_CTX_get_signature_md(EVP_PKEY_CTX *ctx, const EVP_MD **pmd);
@@ -38,22 +77,58 @@ EVP_PKEY_CTX_set1_id, EVP_PKEY_CTX_get1_id, EVP_PKEY_CTX_get1_id_len
#include <openssl/rsa.h>
int EVP_PKEY_CTX_set_rsa_padding(EVP_PKEY_CTX *ctx, int pad);
int EVP_PKEY_CTX_get_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_get_rsa_pss_saltlen(EVP_PKEY_CTX *ctx, int *len);
int EVP_PKEY_CTX_set_rsa_keygen_bits(EVP_PKEY_CTX *ctx, int mbits);
int EVP_PKEY_CTX_set_rsa_keygen_pubexp(EVP_PKEY_CTX *ctx, BIGNUM *pubexp);
int EVP_PKEY_CTX_set_rsa_keygen_primes(EVP_PKEY_CTX *ctx, int primes);
int EVP_PKEY_CTX_set_rsa_mgf1_md(EVP_PKEY_CTX *ctx, const EVP_MD *md);
int EVP_PKEY_CTX_get_rsa_mgf1_md(EVP_PKEY_CTX *ctx, const EVP_MD **md);
int EVP_PKEY_CTX_set_rsa_oaep_md(EVP_PKEY_CTX *ctx, const EVP_MD *md);
int EVP_PKEY_CTX_get_rsa_oaep_md(EVP_PKEY_CTX *ctx, const EVP_MD **md);
int EVP_PKEY_CTX_set0_rsa_oaep_label(EVP_PKEY_CTX *ctx, unsigned char *label, int len);
int EVP_PKEY_CTX_get0_rsa_oaep_label(EVP_PKEY_CTX *ctx, unsigned char **label);
#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_subprime_len(EVP_PKEY_CTX *ctx, int len);
int EVP_PKEY_CTX_set_dh_paramgen_generator(EVP_PKEY_CTX *ctx, int gen);
int EVP_PKEY_CTX_set_dh_paramgen_type(EVP_PKEY_CTX *ctx, int type);
int EVP_PKEY_CTX_set_dh_pad(EVP_PKEY_CTX *ctx, int pad);
int EVP_PKEY_CTX_set_dh_nid(EVP_PKEY_CTX *ctx, int nid);
int EVP_PKEY_CTX_set_dh_rfc5114(EVP_PKEY_CTX *ctx, int rfc5114);
int EVP_PKEY_CTX_set_dhx_rfc5114(EVP_PKEY_CTX *ctx, int rfc5114);
int EVP_PKEY_CTX_set_dh_kdf_type(EVP_PKEY_CTX *ctx, int kdf);
int EVP_PKEY_CTX_get_dh_kdf_type(EVP_PKEY_CTX *ctx);
int EVP_PKEY_CTX_set0_dh_kdf_oid(EVP_PKEY_CTX *ctx, ASN1_OBJECT *oid);
int EVP_PKEY_CTX_get0_dh_kdf_oid(EVP_PKEY_CTX *ctx, ASN1_OBJECT **oid);
int EVP_PKEY_CTX_set_dh_kdf_md(EVP_PKEY_CTX *ctx, const EVP_MD *md);
int EVP_PKEY_CTX_get_dh_kdf_md(EVP_PKEY_CTX *ctx, const EVP_MD **md);
int EVP_PKEY_CTX_set_dh_kdf_outlen(EVP_PKEY_CTX *ctx, int len);
int EVP_PKEY_CTX_get_dh_kdf_outlen(EVP_PKEY_CTX *ctx, int *len);
int EVP_PKEY_CTX_set0_dh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char *ukm, int len);
int EVP_PKEY_CTX_get0_dh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char **ukm);
#include <openssl/ec.h>
int EVP_PKEY_CTX_set_ec_paramgen_curve_nid(EVP_PKEY_CTX *ctx, int nid);
int EVP_PKEY_CTX_set_ec_param_enc(EVP_PKEY_CTX *ctx, int param_enc);
int EVP_PKEY_CTX_set_ecdh_cofactor_mode(EVP_PKEY_CTX *ctx, int cofactor_mode);
int EVP_PKEY_CTX_get_ecdh_cofactor_mode(EVP_PKEY_CTX *ctx);
int EVP_PKEY_CTX_set_ecdh_kdf_type(EVP_PKEY_CTX *ctx, int kdf);
int EVP_PKEY_CTX_get_ecdh_kdf_type(EVP_PKEY_CTX *ctx);
int EVP_PKEY_CTX_set_ecdh_kdf_md(EVP_PKEY_CTX *ctx, const EVP_MD *md);
int EVP_PKEY_CTX_get_ecdh_kdf_md(EVP_PKEY_CTX *ctx, const EVP_MD **md);
int EVP_PKEY_CTX_set_ecdh_kdf_outlen(EVP_PKEY_CTX *ctx, int len);
int EVP_PKEY_CTX_get_ecdh_kdf_outlen(EVP_PKEY_CTX *ctx, int *len);
int EVP_PKEY_CTX_set0_ecdh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char *ukm, int len);
int EVP_PKEY_CTX_get0_ecdh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char **ukm);
int EVP_PKEY_CTX_set1_id(EVP_PKEY_CTX *ctx, void *id, size_t id_len);
int EVP_PKEY_CTX_get1_id(EVP_PKEY_CTX *ctx, void *id);
@@ -73,6 +148,9 @@ and B<p2> is MAC key. This is used by Poly1305, SipHash, HMAC and CMAC.
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_CTX_ctrl_uint64() is a wrapper that directly passes a
uint64 value as B<p2> to EVP_PKEY_CTX_ctrl().
The function EVP_PKEY_CTX_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
@@ -80,6 +158,9 @@ 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.
The function EVP_PKEY_CTX_md() sends a message digest control operation
to the context B<ctx>. The message digest is specified by its name B<md>.
All the remaining "functions" are implemented as macros.
The EVP_PKEY_CTX_set_signature_md() macro sets the message digest type used
@@ -99,12 +180,14 @@ L<EVP_PKEY_new_raw_private_key(3)> or similar functions instead of this macro.
The EVP_PKEY_CTX_set_mac_key() macro can be used with any of the algorithms
supported by the L<EVP_PKEY_new_raw_private_key(3)> function.
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).
=head2 RSA parameters
The EVP_PKEY_CTX_set_rsa_padding() macro sets the RSA padding mode for B<ctx>.
The B<pad> parameter can take the value B<RSA_PKCS1_PADDING> for PKCS#1
padding, B<RSA_SSLV23_PADDING> for SSLv23 padding, B<RSA_NO_PADDING> for
no padding, B<RSA_PKCS1_OAEP_PADDING> for OAEP padding (encrypt and
decrypt only), B<RSA_X931_PADDING> for X9.31 padding (signature operations
only) and B<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
@@ -116,41 +199,154 @@ 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_get_rsa_padding() macro gets the RSA padding mode for B<ctx>.
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. Three special
values are supported: RSA_PSS_SALTLEN_DIGEST sets the salt length to the
digest length, RSA_PSS_SALTLEN_MAX sets the salt length to the maximum
permissible value. When verifying RSA_PSS_SALTLEN_AUTO causes the salt length
B<len>. As its name implies it is only supported for PSS padding. Three special
values are supported: B<RSA_PSS_SALTLEN_DIGEST> sets the salt length to the
digest length, B<RSA_PSS_SALTLEN_MAX> sets the salt length to the maximum
permissible value. When verifying B<RSA_PSS_SALTLEN_AUTO> causes the salt length
to be automatically determined based on the B<PSS> block structure. If this
macro is not called maximum salt length is used when signing and auto detection
when verifying is used by default.
The EVP_PKEY_CTX_get_rsa_pss_saltlen() macro gets the RSA PSS salt length
for B<ctx>. The padding mode must have been set to B<RSA_PKCS1_PSS_PADDING>.
The EVP_PKEY_CTX_set_rsa_keygen_bits() macro sets the RSA key length for
RSA key generation 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
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.
modified or freed after the call. If not specified 65537 is used.
The macro EVP_PKEY_CTX_set_dsa_paramgen_bits() sets the number of bits used
The EVP_PKEY_CTX_set_rsa_keygen_primes() macro sets the number of primes for
RSA key generation to B<primes>. If not specified 2 is used.
The EVP_PKEY_CTX_set_rsa_mgf1_md() macro sets the MGF1 digest for RSA padding
schemes to B<md>. If not explicitly set the signing digest is used. The
padding mode must have been set to B<RSA_PKCS1_OAEP_PADDING>
or B<RSA_PKCS1_PSS_PADDING>.
The EVP_PKEY_CTX_get_rsa_mgf1_md() macro gets the MGF1 digest for B<ctx>.
If not explicitly set the signing digest is used. The padding mode must have
been set to B<RSA_PKCS1_OAEP_PADDING> or B<RSA_PKCS1_PSS_PADDING>.
The EVP_PKEY_CTX_set_rsa_oaep_md() macro sets the message digest type used
in RSA OAEP to B<md>. The padding mode must have been set to
B<RSA_PKCS1_OAEP_PADDING>.
The EVP_PKEY_CTX_get_rsa_oaep_md() macro gets the message digest type used
in RSA OAEP to B<md>. The padding mode must have been set to
B<RSA_PKCS1_OAEP_PADDING>.
The EVP_PKEY_CTX_set0_rsa_oaep_label() macro sets the RSA OAEP label to
B<label> and its length to B<len>. If B<label> is NULL or B<len> is 0,
the label is cleared. The library takes ownership of the label so the
caller should not free the original memory pointed to by B<label>.
The padding mode must have been set to B<RSA_PKCS1_OAEP_PADDING>.
The EVP_PKEY_CTX_get0_rsa_oaep_label() macro gets the RSA OAEP label to
B<label>. The return value is the label length. The padding mode
must have been set to B<RSA_PKCS1_OAEP_PADDING>. The resulting pointer is owned
by the library and should not be freed by the caller.
=head2 DSA parameters
The EVP_PKEY_CTX_set_dsa_paramgen_bits() macro 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
=head2 DH parameters
The EVP_PKEY_CTX_set_dh_paramgen_prime_len() macro sets the length of the DH
prime parameter B<p> for DH parameter generation. If this macro is not called
then 1024 is used.
then 1024 is used. Only accepts lengths greater than or equal to 256.
The EVP_PKEY_CTX_set_dh_paramgen_subprime_len() macro sets the length of the DH
optional subprime parameter B<q> for DH parameter generation. The default is
256 if the prime is at least 2048 bits long or 160 otherwise. The DH
paramgen type must have been set to x9.42.
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_dh_paramgen_type() macro sets the key type for DH
parameter generation. Use 0 for PKCS#3 DH and 1 for X9.42 DH.
The default is 0.
The EVP_PKEY_CTX_set_dh_pad() macro sets the DH padding mode. If B<pad> is
1 the shared secret is padded with zeroes up to the size of the DH prime B<p>.
If B<pad> is zero (the default) then no padding is performed.
EVP_PKEY_CTX_set_dh_nid() sets the DH parameters to values corresponding to
B<nid>. The B<nid> parameter must be B<NID_ffdhe2048>, B<NID_ffdhe3072>,
B<NID_ffdhe4096>, B<NID_ffdhe6144> or B<NID_ffdhe8192>. This macro can be
called during parameter or key generation.
B<nid> as defined in RFC7919. The B<nid> parameter must be B<NID_ffdhe2048>,
B<NID_ffdhe3072>, B<NID_ffdhe4096>, B<NID_ffdhe6144>, B<NID_ffdhe8192>
or B<NID_undef> to clear the stored value. This macro can be called during
parameter or key generation.
The nid parameter and the rfc5114 parameter are mutually exclusive.
The EVP_PKEY_CTX_set_dh_rfc5114() and EVP_PKEY_CTX_set_dhx_rfc5114() macros are
synonymous. They set the DH parameters to the values defined in RFC5114. The
B<rfc5114> parameter must be 1, 2 or 3 corresponding to RFC5114 sections
2.1, 2.2 and 2.3. or 0 to clear the stored value. This macro can be called
during parameter generation. The B<ctx> must have a key type of
B<EVP_PKEY_DHX>.
The rfc5114 parameter and the nid parameter are mutually exclusive.
=head2 DH key derivation function parameters
Note that all of the following functions require that the B<ctx> parameter has
a private key type of B<EVP_PKEY_DHX>. When using key derivation, the output of
EVP_PKEY_derive() is the output of the KDF instead of the DH shared secret.
The KDF output is typically used as a Key Encryption Key (KEK) that in turn
encrypts a Content Encryption Key (CEK).
The EVP_PKEY_CTX_set_dh_kdf_type() macro sets the key derivation function type
to B<kdf> for DH key derivation. Possible values are B<EVP_PKEY_DH_KDF_NONE>
and B<EVP_PKEY_DH_KDF_X9_42> which uses the key derivation specified in RFC2631
(based on the keying algorithm described in X9.42). When using key derivation,
the B<kdf_oid>, B<kdf_md> and B<kdf_outlen> parameters must also be specified.
The EVP_PKEY_CTX_get_dh_kdf_type() macro gets the key derivation function type
for B<ctx> used for DH key derivation. Possible values are B<EVP_PKEY_DH_KDF_NONE>
and B<EVP_PKEY_DH_KDF_X9_42>.
The EVP_PKEY_CTX_set0_dh_kdf_oid() macro sets the key derivation function
object identifier to B<oid> for DH key derivation. This OID should identify
the algorithm to be used with the Content Encryption Key.
The library takes ownership of the object identifier so the caller should not
free the original memory pointed to by B<oid>.
The EVP_PKEY_CTX_get0_dh_kdf_oid() macro gets the key derivation function oid
for B<ctx> used for DH key derivation. The resulting pointer is owned by the
library and should not be freed by the caller.
The EVP_PKEY_CTX_set_dh_kdf_md() macro sets the key derivation function
message digest to B<md> for DH key derivation. Note that RFC2631 specifies
that this digest should be SHA1 but OpenSSL tolerates other digests.
The EVP_PKEY_CTX_get_dh_kdf_md() macro gets the key derivation function
message digest for B<ctx> used for DH key derivation.
The EVP_PKEY_CTX_set_dh_kdf_outlen() macro sets the key derivation function
output length to B<len> for DH key derivation.
The EVP_PKEY_CTX_get_dh_kdf_outlen() macro gets the key derivation function
output length for B<ctx> used for DH key derivation.
The EVP_PKEY_CTX_set0_dh_kdf_ukm() macro sets the user key material to
B<ukm> and its length to B<len> for DH key derivation. This parameter is optional
and corresponds to the partyAInfo field in RFC2631 terms. The specification
requires that it is 512 bits long but this is not enforced by OpenSSL.
The library takes ownership of the user key material so the caller should not
free the original memory pointed to by B<ukm>.
The EVP_PKEY_CTX_get0_dh_kdf_ukm() macro gets the user key material for B<ctx>.
The return value is the user key material length. The resulting pointer is owned
by the library and should not be freed by the caller.
=head2 EC parameters
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
@@ -158,7 +354,7 @@ or an error occurs because there is no default curve.
This function can also be called to set the curve explicitly when
generating an EC key.
The EVP_PKEY_CTX_set_ec_param_enc() sets the EC parameter encoding to
The EVP_PKEY_CTX_set_ec_param_enc() macro sets the EC parameter encoding to
B<param_enc> when generating EC parameters or an EC key. The encoding can be
B<OPENSSL_EC_EXPLICIT_CURVE> for explicit parameters (the default in versions
of OpenSSL before 1.1.0) or B<OPENSSL_EC_NAMED_CURVE> to use named curve form.
@@ -166,6 +362,53 @@ For maximum compatibility the named curve form should be used. Note: the
B<OPENSSL_EC_NAMED_CURVE> value was only added to OpenSSL 1.1.0; previous
versions should use 0 instead.
=head2 ECDH parameters
The EVP_PKEY_CTX_set_ecdh_cofactor_mode() macro sets the cofactor mode to
B<cofactor_mode> for ECDH key derivation. Possible values are 1 to enable
cofactor key derivation, 0 to disable it and -1 to clear the stored cofactor
mode and fallback to the private key cofactor mode.
The EVP_PKEY_CTX_get_ecdh_cofactor_mode() macro returns the cofactor mode for
B<ctx> used for ECDH key derivation. Possible values are 1 when cofactor key
derivation is enabled and 0 otherwise.
=head2 ECDH key derivation function parameters
The EVP_PKEY_CTX_set_ecdh_kdf_type() macro sets the key derivation function type
to B<kdf> for ECDH key derivation. Possible values are B<EVP_PKEY_ECDH_KDF_NONE>
and B<EVP_PKEY_ECDH_KDF_X9_63> which uses the key derivation specified in X9.63.
When using key derivation, the B<kdf_md> and B<kdf_outlen> parameters must
also be specified.
The EVP_PKEY_CTX_get_ecdh_kdf_type() macro returns the key derivation function
type for B<ctx> used for ECDH key derivation. Possible values are
B<EVP_PKEY_ECDH_KDF_NONE> and B<EVP_PKEY_ECDH_KDF_X9_63>.
The EVP_PKEY_CTX_set_ecdh_kdf_md() macro sets the key derivation function
message digest to B<md> for ECDH key derivation. Note that X9.63 specifies
that this digest should be SHA1 but OpenSSL tolerates other digests.
The EVP_PKEY_CTX_get_ecdh_kdf_md() macro gets the key derivation function
message digest for B<ctx> used for ECDH key derivation.
The EVP_PKEY_CTX_set_ecdh_kdf_outlen() macro sets the key derivation function
output length to B<len> for ECDH key derivation.
The EVP_PKEY_CTX_get_ecdh_kdf_outlen() macro gets the key derivation function
output length for B<ctx> used for ECDH key derivation.
The EVP_PKEY_CTX_set0_ecdh_kdf_ukm() macro sets the user key material to B<ukm>
for ECDH key derivation. This parameter is optional and corresponds to the
shared info in X9.63 terms. The library takes ownership of the user key material
so the caller should not free the original memory pointed to by B<ukm>.
The EVP_PKEY_CTX_get0_ecdh_kdf_ukm() macro gets the user key material for B<ctx>.
The return value is the user key material length. The resulting pointer is owned
by the library and should not be freed by the caller.
=head2 Other parameters
The EVP_PKEY_CTX_set1_id(), EVP_PKEY_CTX_get1_id() and EVP_PKEY_CTX_get1_id_len()
macros are used to manipulate the special identifier field for specific signature
algorithms such as SM2. The EVP_PKEY_CTX_set1_id() sets an ID pointed by B<id> with
@@ -191,7 +434,7 @@ L<EVP_PKEY_decrypt(3)>,
L<EVP_PKEY_sign(3)>,
L<EVP_PKEY_verify(3)>,
L<EVP_PKEY_verify_recover(3)>,
L<EVP_PKEY_derive(3)>
L<EVP_PKEY_derive(3)>,
L<EVP_PKEY_keygen(3)>
=head1 HISTORY