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dd1f28427b
Reviewed-by: Matt Caswell <matt@openssl.org> Reviewed-by: Tomas Mraz <tomas@openssl.org> (Merged from https://github.com/openssl/openssl/pull/19816)
143 lines
4.7 KiB
Plaintext
143 lines
4.7 KiB
Plaintext
=pod
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=head1 NAME
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EVP_PKEY_set1_encoded_public_key, EVP_PKEY_get1_encoded_public_key,
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EVP_PKEY_set1_tls_encodedpoint, EVP_PKEY_get1_tls_encodedpoint
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- functions to set and get public key data within an EVP_PKEY
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=head1 SYNOPSIS
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#include <openssl/evp.h>
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int EVP_PKEY_set1_encoded_public_key(EVP_PKEY *pkey,
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const unsigned char *pub, size_t publen);
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size_t EVP_PKEY_get1_encoded_public_key(EVP_PKEY *pkey, unsigned char **ppub);
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The following functions have been deprecated since OpenSSL 3.0, and can be
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hidden entirely by defining B<OPENSSL_API_COMPAT> with a suitable version value,
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see L<openssl_user_macros(7)>:
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int EVP_PKEY_set1_tls_encodedpoint(EVP_PKEY *pkey,
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const unsigned char *pt, size_t ptlen);
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size_t EVP_PKEY_get1_tls_encodedpoint(EVP_PKEY *pkey, unsigned char **ppt);
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=head1 DESCRIPTION
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EVP_PKEY_set1_encoded_public_key() can be used to set the public key value
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within an existing EVP_PKEY object. For the built-in OpenSSL algorithms this
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currently only works for those that support key exchange. Parameters are not
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set as part of this operation, so typically an application will create an
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EVP_PKEY first, set the parameters on it, and then call this function.
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For example setting the parameters might be done using
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L<EVP_PKEY_copy_parameters(3)>.
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The format for the encoded public key will depend on the algorithm in use. For
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DH it should be encoded as a positive integer in big-endian form. For EC is
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should be a point conforming to Sec. 2.3.4 of the SECG SEC 1 ("Elliptic
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Curve Cryptography") standard. For X25519 and X448 it should be encoded in a
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format as defined by RFC7748.
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The key to be updated is supplied in B<pkey>. The buffer containing the encoded
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key is pointed to be B<pub>. The length of the buffer is supplied in B<publen>.
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EVP_PKEY_get1_encoded_public_key() does the equivalent operation except that
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the encoded public key is returned to the application. The key containing the
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public key data is supplied in B<pkey>. A buffer containing the encoded key will
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be allocated and stored in B<*ppub>. The length of the encoded public key is
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returned by the function. The application is responsible for freeing the
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allocated buffer.
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The macro EVP_PKEY_set1_tls_encodedpoint() is deprecated and simply calls
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EVP_PKEY_set1_encoded_public_key() with all the same arguments. New applications
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should use EVP_PKEY_set1_encoded_public_key() instead.
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The macro EVP_PKEY_get1_tls_encodedpoint() is deprecated and simply calls
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EVP_PKEY_get1_encoded_public_key() with all the same arguments. New applications
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should use EVP_PKEY_get1_encoded_public_key() instead.
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=head1 RETURN VALUES
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EVP_PKEY_set1_encoded_public_key() returns 1 for success and 0 or a negative
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value for failure.
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EVP_PKEY_get1_encoded_public_key() returns the length of the encoded key or 0 for failure.
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=head1 EXAMPLES
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See L<EVP_PKEY_derive_init(3)> and L<EVP_PKEY_derive(3)> for information about
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performing a key exchange operation.
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=head2 Set up a peer's EVP_PKEY ready for a key exchange operation
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#include <openssl/evp.h>
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int exchange(EVP_PKEY *ourkey, unsigned char *peer_pub, size_t peer_pub_len)
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{
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EVP_PKEY *peerkey = EVP_PKEY_new();
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if (peerkey == NULL || EVP_PKEY_copy_parameters(peerkey, ourkey) <= 0)
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return 0;
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if (EVP_PKEY_set1_encoded_public_key(peerkey, peer_pub,
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peer_pub_len) <= 0)
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return 0;
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/* Do the key exchange here */
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EVP_PKEY_free(peerkey);
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return 1;
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}
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=head2 Get an encoded public key to send to a peer
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#include <openssl/evp.h>
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int get_encoded_pub_key(EVP_PKEY *ourkey)
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{
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unsigned char *pubkey;
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size_t pubkey_len;
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pubkey_len = EVP_PKEY_get1_encoded_public_key(ourkey, &pubkey);
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if (pubkey_len == 0)
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return 0;
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/*
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* Send the encoded public key stored in the buffer at "pubkey" and of
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* length pubkey_len, to the peer.
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*/
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OPENSSL_free(pubkey);
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return 1;
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}
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=head1 SEE ALSO
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L<EVP_PKEY_new(3)>, L<EVP_PKEY_copy_parameters(3)>,
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L<EVP_PKEY_derive_init(3)>, L<EVP_PKEY_derive(3)>,
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L<EVP_PKEY-DH(7)>, L<EVP_PKEY-EC(7)>, L<EVP_PKEY-X25519(7)>, L<EVP_PKEY-X448(7)>
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=head1 HISTORY
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EVP_PKEY_set1_encoded_public_key() and EVP_PKEY_get1_encoded_public_key() were
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added in OpenSSL 3.0.
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EVP_PKEY_set1_tls_encodedpoint() and EVP_PKEY_get1_tls_encodedpoint() were
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deprecated in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2020 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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