1=pod 2 3=head1 NAME 4 5EVP_PKEY-X25519, EVP_PKEY-X448, EVP_PKEY-ED25519, EVP_PKEY-ED448, 6EVP_KEYMGMT-X25519, EVP_KEYMGMT-X448, EVP_KEYMGMT-ED25519, EVP_KEYMGMT-ED448 7- EVP_PKEY X25519, X448, ED25519 and ED448 keytype and algorithm support 8 9=head1 DESCRIPTION 10 11The B<X25519>, B<X448>, B<ED25519> and B<ED448> keytypes are 12implemented in OpenSSL's default and FIPS providers. These implementations 13support the associated key, containing the public key I<pub> and the 14private key I<priv>. 15 16No additional parameters can be set during key generation. 17 18 19=head2 Common X25519, X448, ED25519 and ED448 parameters 20 21In addition to the common parameters that all keytypes should support (see 22L<provider-keymgmt(7)/Common parameters>), the implementation of these keytypes 23support the following. 24 25=over 4 26 27=item "group" (B<OSSL_PKEY_PARAM_GROUP_NAME>) <UTF8 string> 28 29This is only supported by X25519 and X448. The group name must be "x25519" or 30"x448" respectively for those algorithms. This is only present for consistency 31with other key exchange algorithms and is typically not needed. 32 33=item "pub" (B<OSSL_PKEY_PARAM_PUB_KEY>) <octet string> 34 35The public key value. 36 37=item "priv" (B<OSSL_PKEY_PARAM_PRIV_KEY>) <octet string> 38 39The private key value. 40 41=item "encoded-pub-key" (B<OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY>) <octet string> 42 43Used for getting and setting the encoding of a public key for the B<X25519> and 44B<X448> key types. Public keys are expected be encoded in a format as defined by 45RFC7748. 46 47=back 48 49=head2 ED25519 and ED448 parameters 50 51=over 4 52 53=item "mandatory-digest" (B<OSSL_PKEY_PARAM_MANDATORY_DIGEST>) <UTF8 string> 54 55The empty string, signifying that no digest may be specified. 56 57=back 58 59=head1 CONFORMING TO 60 61=over 4 62 63=item RFC 8032 64 65=item RFC 8410 66 67=back 68 69=head1 EXAMPLES 70 71An B<EVP_PKEY> context can be obtained by calling: 72 73 EVP_PKEY_CTX *pctx = 74 EVP_PKEY_CTX_new_from_name(NULL, "X25519", NULL); 75 76 EVP_PKEY_CTX *pctx = 77 EVP_PKEY_CTX_new_from_name(NULL, "X448", NULL); 78 79 EVP_PKEY_CTX *pctx = 80 EVP_PKEY_CTX_new_from_name(NULL, "ED25519", NULL); 81 82 EVP_PKEY_CTX *pctx = 83 EVP_PKEY_CTX_new_from_name(NULL, "ED448", NULL); 84 85An B<X25519> key can be generated like this: 86 87 pkey = EVP_PKEY_Q_keygen(NULL, NULL, "X25519"); 88 89An B<X448>, B<ED25519>, or B<ED448> key can be generated likewise. 90 91=head1 SEE ALSO 92 93L<EVP_KEYMGMT(3)>, L<EVP_PKEY(3)>, L<provider-keymgmt(7)>, 94L<EVP_KEYEXCH-X25519(7)>, L<EVP_KEYEXCH-X448(7)>, 95L<EVP_SIGNATURE-ED25519(7)>, L<EVP_SIGNATURE-ED448(7)> 96 97=head1 COPYRIGHT 98 99Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved. 100 101Licensed under the Apache License 2.0 (the "License"). You may not use 102this file except in compliance with the License. You can obtain a copy 103in the file LICENSE in the source distribution or at 104L<https://www.openssl.org/source/license.html>. 105 106=cut 107