2017-04-30 20:42:35 +08:00
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=pod
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=head1 NAME
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Ed25519 - EVP_PKEY Ed25519 support
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=head1 DESCRIPTION
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The B<Ed25519> EVP_PKEY implementation supports key generation, one shot
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digest sign and digest verify using PureEdDSA and B<Ed25519> (see RFC8032).
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It has associated private and public key formats compatible with
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draft-ietf-curdle-pkix-04.
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No additional parameters can be set during key generation one shot signing or
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verification. In particular, because PureEdDSA is used, when signing or
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verifying a digest must B<NOT> be specified.
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=head1 NOTES
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2017-08-01 06:58:40 +08:00
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The PureEdDSA algorithm does not support the streaming mechanism
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of other signature algorithms using, for example, EVP_DigestUpdate().
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The message to sign or verify must be passed using the one shot
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EVP_DigestSign() asn EVP_DigestVerify() functions.
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When calling EVP_DigestSignInit() or EVP_DigestSignUpdate() the
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digest parameter B<MUST> be set to B<NULL>.
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Applications wishing to sign certificates (or other structures such as
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CRLs or certificate requests) using Ed25519 can either use X509_sign()
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or X509_sign_ctx() in the usual way.
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A context for the B<Ed25519> algorithm can be obtained by calling:
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2017-06-20 23:32:44 +08:00
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EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_ED25519, NULL);
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2017-04-30 20:42:35 +08:00
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=head1 EXAMPLE
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This example generates an B<ED25519> private key and writes it to standard
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output in PEM format:
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#include <openssl/evp.h>
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#include <openssl/pem.h>
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...
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EVP_PKEY *pkey = NULL;
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EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_ED25519, NULL);
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EVP_PKEY_keygen_init(pctx);
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EVP_PKEY_keygen(pctx, &pkey);
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EVP_PKEY_CTX_free(pctx);
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PEM_write_PrivateKey(stdout, pkey, NULL, NULL, 0, NULL, NULL);
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=head1 SEE ALSO
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L<EVP_PKEY_CTX_new(3)>,
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L<EVP_PKEY_keygen(3)>,
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L<EVP_DigestSignInit(3)>,
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L<EVP_DigestVerifyInit(3)>,
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=head1 COPYRIGHT
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Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (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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