1ED25519(7)                          OpenSSL                         ED25519(7)
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NAME

6       Ed25519, Ed448 - EVP_PKEY Ed25519 and Ed448 support
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DESCRIPTION

9       The Ed25519 and Ed448 EVP_PKEY implementation supports key generation,
10       one-shot digest sign and digest verify using PureEdDSA and Ed25519 or
11       Ed448 (see RFC8032). It has associated private and public key formats
12       compatible with draft-ietf-curdle-pkix-04.
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14       No additional parameters can be set during key generation, one-shot
15       signing or verification. In particular, because PureEdDSA is used, a
16       digest must NOT be specified when signing or verifying.
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NOTES

19       The PureEdDSA algorithm does not support the streaming mechanism of
20       other signature algorithms using, for example, EVP_DigestUpdate().  The
21       message to sign or verify must be passed using the one-shot
22       EVP_DigestSign() and EVP_DigestVerify() functions.
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24       When calling EVP_DigestSignInit() or EVP_DigestVerifyInit(), the digest
25       type parameter MUST be set to NULL.
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27       Applications wishing to sign certificates (or other structures such as
28       CRLs or certificate requests) using Ed25519 or Ed448 can either use
29       X509_sign() or X509_sign_ctx() in the usual way.
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31       A context for the Ed25519 algorithm can be obtained by calling:
32
33        EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_ED25519, NULL);
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35       For the Ed448 algorithm a context can be obtained by calling:
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37        EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_ED448, NULL);
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39       Ed25519 or Ed448 private keys can be set directly using
40       EVP_PKEY_new_raw_private_key(3) or loaded from a PKCS#8 private key
41       file using PEM_read_bio_PrivateKey(3) (or similar function). Completely
42       new keys can also be generated (see the example below). Setting a
43       private key also sets the associated public key.
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45       Ed25519 or Ed448 public keys can be set directly using
46       EVP_PKEY_new_raw_public_key(3) or loaded from a SubjectPublicKeyInfo
47       structure in a PEM file using PEM_read_bio_PUBKEY(3) (or similar
48       function).
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50       Ed25519 and Ed448 can be tested within speed(1) application since
51       version 1.1.1.  Valid algorithm names are ed25519, ed448 and eddsa. If
52       eddsa is specified, then both Ed25519 and Ed448 are benchmarked.
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EXAMPLE

55       This example generates an ED25519 private key and writes it to standard
56       output in PEM format:
57
58        #include <openssl/evp.h>
59        #include <openssl/pem.h>
60        ...
61        EVP_PKEY *pkey = NULL;
62        EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_ED25519, NULL);
63        EVP_PKEY_keygen_init(pctx);
64        EVP_PKEY_keygen(pctx, &pkey);
65        EVP_PKEY_CTX_free(pctx);
66        PEM_write_PrivateKey(stdout, pkey, NULL, NULL, 0, NULL, NULL);
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SEE ALSO

69       EVP_PKEY_CTX_new(3), EVP_PKEY_keygen(3), EVP_DigestSignInit(3),
70       EVP_DigestVerifyInit(3),
71

73       Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
74
75       Licensed under the OpenSSL license (the "License").  You may not use
76       this file except in compliance with the License.  You can obtain a copy
77       in the file LICENSE in the source distribution or at
78       <https://www.openssl.org/source/license.html>.
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821.1.1c                            2019-05-28                        ED25519(7)
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