mirror of
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9fdcc21fdc
Reviewed-by: Richard Levitte <levitte@openssl.org> Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/8029)
471 lines
22 KiB
Plaintext
471 lines
22 KiB
Plaintext
=pod
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=head1 NAME
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EVP_PKEY_CTX_ctrl,
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EVP_PKEY_CTX_ctrl_str,
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EVP_PKEY_CTX_ctrl_uint64,
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EVP_PKEY_CTX_md,
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EVP_PKEY_CTX_set_signature_md,
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EVP_PKEY_CTX_get_signature_md,
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EVP_PKEY_CTX_set_mac_key,
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EVP_PKEY_CTX_set_rsa_padding,
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EVP_PKEY_CTX_get_rsa_padding,
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EVP_PKEY_CTX_set_rsa_pss_saltlen,
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EVP_PKEY_CTX_get_rsa_pss_saltlen,
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EVP_PKEY_CTX_set_rsa_keygen_bits,
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EVP_PKEY_CTX_set_rsa_keygen_pubexp,
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EVP_PKEY_CTX_set_rsa_keygen_primes,
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EVP_PKEY_CTX_set_rsa_mgf1_md,
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EVP_PKEY_CTX_get_rsa_mgf1_md,
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EVP_PKEY_CTX_set_rsa_oaep_md,
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EVP_PKEY_CTX_get_rsa_oaep_md,
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EVP_PKEY_CTX_set0_rsa_oaep_label,
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EVP_PKEY_CTX_get0_rsa_oaep_label,
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EVP_PKEY_CTX_set_dsa_paramgen_bits,
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EVP_PKEY_CTX_set_dsa_paramgen_q_bits,
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EVP_PKEY_CTX_set_dsa_paramgen_md,
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EVP_PKEY_CTX_set_dh_paramgen_prime_len,
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EVP_PKEY_CTX_set_dh_paramgen_subprime_len,
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EVP_PKEY_CTX_set_dh_paramgen_generator,
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EVP_PKEY_CTX_set_dh_paramgen_type,
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EVP_PKEY_CTX_set_dh_rfc5114,
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EVP_PKEY_CTX_set_dhx_rfc5114,
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EVP_PKEY_CTX_set_dh_pad,
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EVP_PKEY_CTX_set_dh_nid,
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EVP_PKEY_CTX_set_dh_kdf_type,
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EVP_PKEY_CTX_get_dh_kdf_type,
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EVP_PKEY_CTX_set0_dh_kdf_oid,
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EVP_PKEY_CTX_get0_dh_kdf_oid,
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EVP_PKEY_CTX_set_dh_kdf_md,
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EVP_PKEY_CTX_get_dh_kdf_md,
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EVP_PKEY_CTX_set_dh_kdf_outlen,
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EVP_PKEY_CTX_get_dh_kdf_outlen,
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EVP_PKEY_CTX_set0_dh_kdf_ukm,
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EVP_PKEY_CTX_get0_dh_kdf_ukm,
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EVP_PKEY_CTX_set_ec_paramgen_curve_nid,
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EVP_PKEY_CTX_set_ec_param_enc,
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EVP_PKEY_CTX_set_ecdh_cofactor_mode,
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EVP_PKEY_CTX_get_ecdh_cofactor_mode,
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EVP_PKEY_CTX_set_ecdh_kdf_type,
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EVP_PKEY_CTX_get_ecdh_kdf_type,
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EVP_PKEY_CTX_set_ecdh_kdf_md,
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EVP_PKEY_CTX_get_ecdh_kdf_md,
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EVP_PKEY_CTX_set_ecdh_kdf_outlen,
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EVP_PKEY_CTX_get_ecdh_kdf_outlen,
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EVP_PKEY_CTX_set0_ecdh_kdf_ukm,
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EVP_PKEY_CTX_get0_ecdh_kdf_ukm,
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EVP_PKEY_CTX_set1_id, EVP_PKEY_CTX_get1_id, EVP_PKEY_CTX_get1_id_len
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- 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_uint64(EVP_PKEY_CTX *ctx, int keytype, int optype,
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int cmd, uint64_t value);
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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_CTX_md(EVP_PKEY_CTX *ctx, int optype, int cmd, const char *md);
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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_get_signature_md(EVP_PKEY_CTX *ctx, const EVP_MD **pmd);
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int EVP_PKEY_CTX_set_mac_key(EVP_PKEY_CTX *ctx, const unsigned char *key,
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int len);
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#include <openssl/rsa.h>
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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_get_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_get_rsa_pss_saltlen(EVP_PKEY_CTX *ctx, int *len);
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int EVP_PKEY_CTX_set_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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int EVP_PKEY_CTX_set_rsa_keygen_primes(EVP_PKEY_CTX *ctx, int primes);
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int EVP_PKEY_CTX_set_rsa_mgf1_md(EVP_PKEY_CTX *ctx, const EVP_MD *md);
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int EVP_PKEY_CTX_get_rsa_mgf1_md(EVP_PKEY_CTX *ctx, const EVP_MD **md);
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int EVP_PKEY_CTX_set_rsa_oaep_md(EVP_PKEY_CTX *ctx, const EVP_MD *md);
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int EVP_PKEY_CTX_get_rsa_oaep_md(EVP_PKEY_CTX *ctx, const EVP_MD **md);
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int EVP_PKEY_CTX_set0_rsa_oaep_label(EVP_PKEY_CTX *ctx, unsigned char *label, int len);
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int EVP_PKEY_CTX_get0_rsa_oaep_label(EVP_PKEY_CTX *ctx, unsigned char **label);
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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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int EVP_PKEY_CTX_set_dsa_paramgen_q_bits(EVP_PKEY_CTX *ctx, int qbits);
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int EVP_PKEY_CTX_set_dsa_paramgen_md(EVP_PKEY_CTX *ctx, const EVP_MD *md);
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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_subprime_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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int EVP_PKEY_CTX_set_dh_paramgen_type(EVP_PKEY_CTX *ctx, int type);
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int EVP_PKEY_CTX_set_dh_pad(EVP_PKEY_CTX *ctx, int pad);
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int EVP_PKEY_CTX_set_dh_nid(EVP_PKEY_CTX *ctx, int nid);
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int EVP_PKEY_CTX_set_dh_rfc5114(EVP_PKEY_CTX *ctx, int rfc5114);
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int EVP_PKEY_CTX_set_dhx_rfc5114(EVP_PKEY_CTX *ctx, int rfc5114);
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int EVP_PKEY_CTX_set_dh_kdf_type(EVP_PKEY_CTX *ctx, int kdf);
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int EVP_PKEY_CTX_get_dh_kdf_type(EVP_PKEY_CTX *ctx);
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int EVP_PKEY_CTX_set0_dh_kdf_oid(EVP_PKEY_CTX *ctx, ASN1_OBJECT *oid);
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int EVP_PKEY_CTX_get0_dh_kdf_oid(EVP_PKEY_CTX *ctx, ASN1_OBJECT **oid);
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int EVP_PKEY_CTX_set_dh_kdf_md(EVP_PKEY_CTX *ctx, const EVP_MD *md);
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int EVP_PKEY_CTX_get_dh_kdf_md(EVP_PKEY_CTX *ctx, const EVP_MD **md);
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int EVP_PKEY_CTX_set_dh_kdf_outlen(EVP_PKEY_CTX *ctx, int len);
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int EVP_PKEY_CTX_get_dh_kdf_outlen(EVP_PKEY_CTX *ctx, int *len);
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int EVP_PKEY_CTX_set0_dh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char *ukm, int len);
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int EVP_PKEY_CTX_get0_dh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char **ukm);
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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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int EVP_PKEY_CTX_set_ec_param_enc(EVP_PKEY_CTX *ctx, int param_enc);
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int EVP_PKEY_CTX_set_ecdh_cofactor_mode(EVP_PKEY_CTX *ctx, int cofactor_mode);
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int EVP_PKEY_CTX_get_ecdh_cofactor_mode(EVP_PKEY_CTX *ctx);
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int EVP_PKEY_CTX_set_ecdh_kdf_type(EVP_PKEY_CTX *ctx, int kdf);
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int EVP_PKEY_CTX_get_ecdh_kdf_type(EVP_PKEY_CTX *ctx);
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int EVP_PKEY_CTX_set_ecdh_kdf_md(EVP_PKEY_CTX *ctx, const EVP_MD *md);
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int EVP_PKEY_CTX_get_ecdh_kdf_md(EVP_PKEY_CTX *ctx, const EVP_MD **md);
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int EVP_PKEY_CTX_set_ecdh_kdf_outlen(EVP_PKEY_CTX *ctx, int len);
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int EVP_PKEY_CTX_get_ecdh_kdf_outlen(EVP_PKEY_CTX *ctx, int *len);
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int EVP_PKEY_CTX_set0_ecdh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char *ukm, int len);
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int EVP_PKEY_CTX_get0_ecdh_kdf_ukm(EVP_PKEY_CTX *ctx, unsigned char **ukm);
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int EVP_PKEY_CTX_set1_id(EVP_PKEY_CTX *ctx, void *id, size_t id_len);
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int EVP_PKEY_CTX_get1_id(EVP_PKEY_CTX *ctx, void *id);
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int EVP_PKEY_CTX_get1_id_len(EVP_PKEY_CTX *ctx, size_t *id_len);
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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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For B<cmd> = B<EVP_PKEY_CTRL_SET_MAC_KEY>, B<p1> is the length of the MAC key,
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and B<p2> is MAC key. This is used by Poly1305, SipHash, HMAC and CMAC.
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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_CTX_ctrl_uint64() is a wrapper that directly passes a
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uint64 value as B<p2> to EVP_PKEY_CTX_ctrl().
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The function EVP_PKEY_CTX_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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The function EVP_PKEY_CTX_md() sends a message digest control operation
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to the context B<ctx>. The message digest is specified by its name B<md>.
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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 in the RSA, DSA and ECDSA algorithms.
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The EVP_PKEY_CTX_get_signature_md() macro gets the message digest type used in a
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signature. It can be used in the RSA, DSA and ECDSA algorithms.
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Key generation typically involves setting up parameters to be used and
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generating the private and public key data. Some algorithm implementations
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allow private key data to be set explicitly using the EVP_PKEY_CTX_set_mac_key()
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macro. In this case key generation is simply the process of setting up the
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parameters for the key and then setting the raw key data to the value explicitly
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provided by that macro. Normally applications would call
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L<EVP_PKEY_new_raw_private_key(3)> or similar functions instead of this macro.
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The EVP_PKEY_CTX_set_mac_key() macro can be used with any of the algorithms
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supported by the L<EVP_PKEY_new_raw_private_key(3)> function.
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=head2 RSA parameters
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The EVP_PKEY_CTX_set_rsa_padding() macro sets the RSA padding mode for B<ctx>.
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The B<pad> parameter can take the value B<RSA_PKCS1_PADDING> for PKCS#1
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padding, B<RSA_SSLV23_PADDING> for SSLv23 padding, B<RSA_NO_PADDING> for
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no padding, B<RSA_PKCS1_OAEP_PADDING> for OAEP padding (encrypt and
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decrypt only), B<RSA_X931_PADDING> for X9.31 padding (signature operations
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only) and B<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
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buffer is expected to be the algorithm identifier byte.
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The EVP_PKEY_CTX_get_rsa_padding() macro gets the RSA padding mode for B<ctx>.
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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. Three special
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values are supported: B<RSA_PSS_SALTLEN_DIGEST> sets the salt length to the
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digest length, B<RSA_PSS_SALTLEN_MAX> sets the salt length to the maximum
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permissible value. When verifying B<RSA_PSS_SALTLEN_AUTO> causes the salt length
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to be automatically determined based on the B<PSS> block structure. If this
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macro is not called maximum salt length is used when signing and auto detection
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when verifying is used by default.
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The EVP_PKEY_CTX_get_rsa_pss_saltlen() macro gets the RSA PSS salt length
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for B<ctx>. The padding mode must have been set to B<RSA_PKCS1_PSS_PADDING>.
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The EVP_PKEY_CTX_set_rsa_keygen_bits() macro sets the RSA key length for
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RSA key generation 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 freed after the call. If not specified 65537 is used.
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The EVP_PKEY_CTX_set_rsa_keygen_primes() macro sets the number of primes for
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RSA key generation to B<primes>. If not specified 2 is used.
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The EVP_PKEY_CTX_set_rsa_mgf1_md() macro sets the MGF1 digest for RSA padding
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schemes to B<md>. If not explicitly set the signing digest is used. The
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padding mode must have been set to B<RSA_PKCS1_OAEP_PADDING>
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or B<RSA_PKCS1_PSS_PADDING>.
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The EVP_PKEY_CTX_get_rsa_mgf1_md() macro gets the MGF1 digest for B<ctx>.
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If not explicitly set the signing digest is used. The padding mode must have
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been set to B<RSA_PKCS1_OAEP_PADDING> or B<RSA_PKCS1_PSS_PADDING>.
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The EVP_PKEY_CTX_set_rsa_oaep_md() macro sets the message digest type used
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in RSA OAEP to B<md>. The padding mode must have been set to
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B<RSA_PKCS1_OAEP_PADDING>.
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The EVP_PKEY_CTX_get_rsa_oaep_md() macro gets the message digest type used
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in RSA OAEP to B<md>. The padding mode must have been set to
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B<RSA_PKCS1_OAEP_PADDING>.
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The EVP_PKEY_CTX_set0_rsa_oaep_label() macro sets the RSA OAEP label to
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B<label> and its length to B<len>. If B<label> is NULL or B<len> is 0,
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the label is cleared. The library takes ownership of the label so the
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caller should not free the original memory pointed to by B<label>.
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The padding mode must have been set to B<RSA_PKCS1_OAEP_PADDING>.
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The EVP_PKEY_CTX_get0_rsa_oaep_label() macro gets the RSA OAEP label to
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B<label>. The return value is the label length. The padding mode
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must have been set to B<RSA_PKCS1_OAEP_PADDING>. The resulting pointer is owned
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by the library and should not be freed by the caller.
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=head2 DSA parameters
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The EVP_PKEY_CTX_set_dsa_paramgen_bits() macro sets the number of bits used
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for DSA parameter generation to B<nbits>. If not specified, 1024 is used.
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The EVP_PKEY_CTX_set_dsa_paramgen_q_bits() macro sets the number of bits in the
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subprime parameter B<q> for DSA parameter generation to B<qbits>. If not
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specified, 160 is used. If a digest function is specified below, this parameter
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is ignored and instead, the number of bits in B<q> matches the size of the
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digest.
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The EVP_PKEY_CTX_set_dsa_paramgen_md() macro sets the digest function used for
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DSA parameter generation to B<md>. If not specified, one of SHA-1, SHA-224, or
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SHA-256 is selected to match the bit length of B<q> above.
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=head2 DH parameters
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The EVP_PKEY_CTX_set_dh_paramgen_prime_len() macro 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. Only accepts lengths greater than or equal to 256.
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The EVP_PKEY_CTX_set_dh_paramgen_subprime_len() macro sets the length of the DH
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optional subprime parameter B<q> for DH parameter generation. The default is
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256 if the prime is at least 2048 bits long or 160 otherwise. The DH
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paramgen type must have been set to x9.42.
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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_dh_paramgen_type() macro sets the key type for DH
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parameter generation. Use 0 for PKCS#3 DH and 1 for X9.42 DH.
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The default is 0.
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The EVP_PKEY_CTX_set_dh_pad() macro sets the DH padding mode. If B<pad> is
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1 the shared secret is padded with zeroes up to the size of the DH prime B<p>.
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If B<pad> is zero (the default) then no padding is performed.
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EVP_PKEY_CTX_set_dh_nid() sets the DH parameters to values corresponding to
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B<nid> as defined in RFC7919. The B<nid> parameter must be B<NID_ffdhe2048>,
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B<NID_ffdhe3072>, B<NID_ffdhe4096>, B<NID_ffdhe6144>, B<NID_ffdhe8192>
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or B<NID_undef> to clear the stored value. This macro can be called during
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parameter or key generation.
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The nid parameter and the rfc5114 parameter are mutually exclusive.
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The EVP_PKEY_CTX_set_dh_rfc5114() and EVP_PKEY_CTX_set_dhx_rfc5114() macros are
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synonymous. They set the DH parameters to the values defined in RFC5114. The
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B<rfc5114> parameter must be 1, 2 or 3 corresponding to RFC5114 sections
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2.1, 2.2 and 2.3. or 0 to clear the stored value. This macro can be called
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during parameter generation. The B<ctx> must have a key type of
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B<EVP_PKEY_DHX>.
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The rfc5114 parameter and the nid parameter are mutually exclusive.
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=head2 DH key derivation function parameters
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Note that all of the following functions require that the B<ctx> parameter has
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a private key type of B<EVP_PKEY_DHX>. When using key derivation, the output of
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EVP_PKEY_derive() is the output of the KDF instead of the DH shared secret.
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The KDF output is typically used as a Key Encryption Key (KEK) that in turn
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encrypts a Content Encryption Key (CEK).
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|
|
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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
|
|
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() 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.
|
|
For maximum compatibility the named curve form should be used. Note: the
|
|
B<OPENSSL_EC_NAMED_CURVE> value was added in 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
|
|
the length B<id_len> to the library. The library takes a copy of the id so that
|
|
the caller can safely free the original memory pointed to by B<id>. The
|
|
EVP_PKEY_CTX_get1_id_len() macro returns the length of the ID set via a previous
|
|
call to EVP_PKEY_CTX_set1_id(). The length is usually used to allocate adequate
|
|
memory for further calls to EVP_PKEY_CTX_get1_id(). The EVP_PKEY_CTX_get1_id()
|
|
macro returns the previously set ID value to caller in B<id>. The caller should
|
|
allocate adequate memory space for the B<id> before calling EVP_PKEY_CTX_get1_id().
|
|
|
|
=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)>,
|
|
L<EVP_PKEY_encrypt(3)>,
|
|
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_keygen(3)>
|
|
|
|
=head1 HISTORY
|
|
|
|
The
|
|
EVP_PKEY_CTX_set1_id(), EVP_PKEY_CTX_get1_id() and EVP_PKEY_CTX_get1_id_len()
|
|
macros were added in 1.1.1, other functions were added in OpenSSL 1.0.0.
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2006-2018 The OpenSSL Project Authors. All Rights Reserved.
|
|
|
|
Licensed under the Apache License 2.0 (the "License"). You may not use
|
|
this file except in compliance with the License. You can obtain a copy
|
|
in the file LICENSE in the source distribution or at
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|