mirror of
https://github.com/openssl/openssl.git
synced 2024-12-27 06:21:43 +08:00
8020d79b40
Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/14512)
144 lines
4.2 KiB
Plaintext
144 lines
4.2 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
EVP_MAC-KMAC, EVP_MAC-KMAC128, EVP_MAC-KMAC256
|
|
- The KMAC EVP_MAC implementations
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
Support for computing KMAC MACs through the B<EVP_MAC> API.
|
|
|
|
=head2 Identity
|
|
|
|
These implementations are identified with one of these names and
|
|
properties, to be used with EVP_MAC_fetch():
|
|
|
|
=over 4
|
|
|
|
=item "KMAC-128", "provider=default" or "provider=fips"
|
|
|
|
=item "KMAC-256", "provider=default" or "provider=fips"
|
|
|
|
=back
|
|
|
|
=head2 Supported parameters
|
|
|
|
The general description of these parameters can be found in
|
|
L<EVP_MAC(3)/PARAMETERS>.
|
|
|
|
All these parameters can be set with EVP_MAC_CTX_set_params().
|
|
Furthermore, the "size" parameter can be retrieved with
|
|
EVP_MAC_CTX_get_params(), or with EVP_MAC_CTX_get_mac_size().
|
|
The length of the "size" parameter should not exceed that of a B<size_t>.
|
|
|
|
=over 4
|
|
|
|
=item "key" (B<OSSL_MAC_PARAM_KEY>) <octet string>
|
|
|
|
Sets the MAC key.
|
|
Setting this parameter is identical to passing a I<key> to L<EVP_MAC_init(3)>.
|
|
|
|
=item "custom" (B<OSSL_MAC_PARAM_CUSTOM>) <octet string>
|
|
|
|
Sets the custom value.
|
|
It is an optional value of at most 127 bytes, and is empty by default.
|
|
|
|
=item "size" (B<OSSL_MAC_PARAM_SIZE>) <unsigned integer>
|
|
|
|
Sets the MAC size.
|
|
By default, it is 16 for C<KMAC-128> and 32 for C<KMAC-256>.
|
|
|
|
=item "xof" (B<OSSL_MAC_PARAM_XOF>) <integer>
|
|
|
|
The "xof" parameter value is expected to be 1 or 0. Use 1 to enable XOF mode.
|
|
The default value is 0.
|
|
|
|
=back
|
|
|
|
The "custom" parameter must be set as part of or before the EVP_MAC_init() call.
|
|
The "xof" and "size" parameters can be set at any time before EVP_MAC_final().
|
|
The "key" parameter is set as part of the EVP_MAC_init() call, but can be
|
|
set before it instead.
|
|
|
|
=head1 EXAMPLES
|
|
|
|
#include <openssl/evp.h>
|
|
#include <openssl/params.h>
|
|
|
|
static int do_kmac(const unsigned char *in, size_t in_len,
|
|
const unsigned char *key, size_t key_len,
|
|
const unsigned char *custom, size_t custom_len,
|
|
int xof_enabled, unsigned char *out, int out_len)
|
|
{
|
|
EVP_MAC_CTX *ctx = NULL;
|
|
EVP_MAC *mac = NULL;
|
|
OSSL_PARAM params[4], *p;
|
|
int ret = 0;
|
|
size_t l = 0;
|
|
|
|
mac = EVP_MAC_fetch(NULL, "KMAC-128", NULL);
|
|
if (mac == NULL)
|
|
goto err;
|
|
ctx = EVP_MAC_CTX_new(mac);
|
|
/* The mac can be freed after it is used by EVP_MAC_CTX_new */
|
|
EVP_MAC_free(mac);
|
|
if (ctx == NULL)
|
|
goto err;
|
|
|
|
/*
|
|
* Setup parameters required before calling EVP_MAC_init()
|
|
* The parameters OSSL_MAC_PARAM_XOF and OSSL_MAC_PARAM_SIZE may also be
|
|
* used at this point.
|
|
*/
|
|
p = params;
|
|
*p++ = OSSL_PARAM_construct_octet_string(OSSL_MAC_PARAM_KEY,
|
|
(void *)key, key_len);
|
|
if (custom != NULL && custom_len != 0)
|
|
*p++ = OSSL_PARAM_construct_octet_string(OSSL_MAC_PARAM_CUSTOM,
|
|
(void *)custom, custom_len);
|
|
*p = OSSL_PARAM_construct_end();
|
|
if (!EVP_MAC_CTX_set_params(ctx, params))
|
|
goto err;
|
|
|
|
if (!EVP_MAC_init(ctx))
|
|
goto err;
|
|
|
|
/*
|
|
* Note: the following optional parameters can be set any time
|
|
* before EVP_MAC_final().
|
|
*/
|
|
p = params;
|
|
*p++ = OSSL_PARAM_construct_int(OSSL_MAC_PARAM_XOF, &xof_enabled);
|
|
*p++ = OSSL_PARAM_construct_int(OSSL_MAC_PARAM_SIZE, &out_len);
|
|
*p = OSSL_PARAM_construct_end();
|
|
if (!EVP_MAC_CTX_set_params(ctx, params))
|
|
goto err;
|
|
|
|
/* The update may be called multiple times here for streamed input */
|
|
if (!EVP_MAC_update(ctx, in, in_len))
|
|
goto err;
|
|
if (!EVP_MAC_final(ctx, out, &l, out_len))
|
|
goto err;
|
|
ret = 1;
|
|
err:
|
|
EVP_MAC_CTX_free(ctx);
|
|
return ret;
|
|
}
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<EVP_MAC_CTX_get_params(3)>, L<EVP_MAC_CTX_set_params(3)>,
|
|
L<EVP_MAC(3)/PARAMETERS>, L<OSSL_PARAM(3)>
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2018-2021 The OpenSSL Project Authors. All Rights Reserved.
|
|
|
|
Licensed under the Apache License 2.0 (the "License"). You may not use
|
|
this file except in compliance with the License. You can obtain a copy
|
|
in the file LICENSE in the source distribution or at
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|