mirror of https://github.com/openssl/openssl
121 lines
3.2 KiB
Plaintext
121 lines
3.2 KiB
Plaintext
=pod
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=head1 NAME
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EVP_PKEY-X25519, EVP_PKEY-X448, EVP_PKEY-ED25519, EVP_PKEY-ED448,
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EVP_KEYMGMT-X25519, EVP_KEYMGMT-X448, EVP_KEYMGMT-ED25519, EVP_KEYMGMT-ED448
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- EVP_PKEY X25519, X448, ED25519 and ED448 keytype and algorithm support
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=head1 DESCRIPTION
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The B<X25519>, B<X448>, B<ED25519> and B<ED448> keytypes are
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implemented in OpenSSL's default and FIPS providers. These implementations
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support the associated key, containing the public key I<pub> and the
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private key I<priv>.
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=head2 Keygen Parameters
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=over 4
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=item "dhkem-ikm" (B<OSSL_PKEY_PARAM_DHKEM_IKM>) <octet string>
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DHKEM requires the generation of a keypair using an input key material (seed).
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Use this to specify the key material used for generation of the private key.
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This value should not be reused for other purposes.
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It should have a length of at least 32 for X25519, and 56 for X448.
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This is only supported by X25519 and X448.
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=back
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Use EVP_PKEY_CTX_set_params() after calling EVP_PKEY_keygen_init().
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=head2 Common X25519, X448, ED25519 and ED448 parameters
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In addition to the common parameters that all keytypes should support (see
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L<provider-keymgmt(7)/Common parameters>), the implementation of these keytypes
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support the following.
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=over 4
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=item "group" (B<OSSL_PKEY_PARAM_GROUP_NAME>) <UTF8 string>
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This is only supported by X25519 and X448. The group name must be "x25519" or
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"x448" respectively for those algorithms. This is only present for consistency
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with other key exchange algorithms and is typically not needed.
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=item "pub" (B<OSSL_PKEY_PARAM_PUB_KEY>) <octet string>
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The public key value.
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=item "priv" (B<OSSL_PKEY_PARAM_PRIV_KEY>) <octet string>
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The private key value.
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=item "encoded-pub-key" (B<OSSL_PKEY_PARAM_ENCODED_PUBLIC_KEY>) <octet string>
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Used for getting and setting the encoding of a public key for the B<X25519> and
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B<X448> key types. Public keys are expected be encoded in a format as defined by
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RFC7748.
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=back
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=head2 ED25519 and ED448 parameters
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=over 4
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=item "mandatory-digest" (B<OSSL_PKEY_PARAM_MANDATORY_DIGEST>) <UTF8 string>
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The empty string, signifying that no digest may be specified.
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=back
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=head1 CONFORMING TO
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=over 4
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=item RFC 8032
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=item RFC 8410
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=back
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=head1 EXAMPLES
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An B<EVP_PKEY> context can be obtained by calling:
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EVP_PKEY_CTX *pctx =
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EVP_PKEY_CTX_new_from_name(NULL, "X25519", NULL);
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EVP_PKEY_CTX *pctx =
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EVP_PKEY_CTX_new_from_name(NULL, "X448", NULL);
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EVP_PKEY_CTX *pctx =
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EVP_PKEY_CTX_new_from_name(NULL, "ED25519", NULL);
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EVP_PKEY_CTX *pctx =
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EVP_PKEY_CTX_new_from_name(NULL, "ED448", NULL);
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An B<X25519> key can be generated like this:
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pkey = EVP_PKEY_Q_keygen(NULL, NULL, "X25519");
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An B<X448>, B<ED25519>, or B<ED448> key can be generated likewise.
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=head1 SEE ALSO
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L<EVP_KEYMGMT(3)>, L<EVP_PKEY(3)>, L<provider-keymgmt(7)>,
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L<EVP_KEYEXCH-X25519(7)>, L<EVP_KEYEXCH-X448(7)>,
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L<EVP_SIGNATURE-ED25519(7)>, L<EVP_SIGNATURE-ED448(7)>
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=head1 COPYRIGHT
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Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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