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211c47ca1b
Now that ACVP test vectors exist, support has been added for this mode. See https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-108r1.pdf Note that the test vectors used fairly large values for the input key and the context, so the contraints for these has been increased from 256 to 512 bytes. Reviewed-by: Richard Levitte <levitte@openssl.org> Reviewed-by: Paul Dale <pauli@openssl.org> Reviewed-by: Tomas Mraz <tomas@openssl.org> (Merged from https://github.com/openssl/openssl/pull/19916)
153 lines
4.5 KiB
Plaintext
153 lines
4.5 KiB
Plaintext
=pod
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=head1 NAME
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EVP_MAC-KMAC, EVP_MAC-KMAC128, EVP_MAC-KMAC256
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- The KMAC EVP_MAC implementations
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=head1 DESCRIPTION
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Support for computing KMAC MACs through the B<EVP_MAC> API.
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=head2 Identity
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These implementations are identified with one of these names and
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properties, to be used with EVP_MAC_fetch():
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=over 4
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=item "KMAC-128", "provider=default" or "provider=fips"
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=item "KMAC-256", "provider=default" or "provider=fips"
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=back
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=head2 Supported parameters
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The general description of these parameters can be found in
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L<EVP_MAC(3)/PARAMETERS>.
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All these parameters can be set with EVP_MAC_CTX_set_params().
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Furthermore, the "size" parameter can be retrieved with
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EVP_MAC_CTX_get_params(), or with EVP_MAC_CTX_get_mac_size().
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The length of the "size" parameter should not exceed that of a B<size_t>.
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Likewise, the "block-size" parameter can be retrieved with
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EVP_MAC_CTX_get_params(), or with EVP_MAC_CTX_get_block_size().
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=over 4
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=item "key" (B<OSSL_MAC_PARAM_KEY>) <octet string>
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Sets the MAC key.
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Setting this parameter is identical to passing a I<key> to L<EVP_MAC_init(3)>.
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The length of the key (in bytes) must be in the range 4...512.
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=item "custom" (B<OSSL_MAC_PARAM_CUSTOM>) <octet string>
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Sets the custom value.
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It is an optional value with a length of at most 512 bytes, and is empty by default.
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=item "size" (B<OSSL_MAC_PARAM_SIZE>) <unsigned integer>
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Sets the MAC size.
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By default, it is 16 for C<KMAC-128> and 32 for C<KMAC-256>.
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=item "block-size" (B<OSSL_MAC_PARAM_SIZE>) <unsigned integer>
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Gets the MAC block size.
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By default, it is 168 for C<KMAC-128> and 136 for C<KMAC-256>.
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=item "xof" (B<OSSL_MAC_PARAM_XOF>) <integer>
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The "xof" parameter value is expected to be 1 or 0. Use 1 to enable XOF mode.
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The default value is 0.
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=back
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The "custom" parameter must be set as part of or before the EVP_MAC_init() call.
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The "xof" and "size" parameters can be set at any time before EVP_MAC_final().
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The "key" parameter is set as part of the EVP_MAC_init() call, but can be
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set before it instead.
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=head1 EXAMPLES
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#include <openssl/evp.h>
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#include <openssl/params.h>
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static int do_kmac(const unsigned char *in, size_t in_len,
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const unsigned char *key, size_t key_len,
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const unsigned char *custom, size_t custom_len,
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int xof_enabled, unsigned char *out, int out_len)
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{
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EVP_MAC_CTX *ctx = NULL;
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EVP_MAC *mac = NULL;
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OSSL_PARAM params[4], *p;
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int ret = 0;
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size_t l = 0;
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mac = EVP_MAC_fetch(NULL, "KMAC-128", NULL);
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if (mac == NULL)
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goto err;
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ctx = EVP_MAC_CTX_new(mac);
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/* The mac can be freed after it is used by EVP_MAC_CTX_new */
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EVP_MAC_free(mac);
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if (ctx == NULL)
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goto err;
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/*
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* Setup parameters required before calling EVP_MAC_init()
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* The parameters OSSL_MAC_PARAM_XOF and OSSL_MAC_PARAM_SIZE may also be
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* used at this point.
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*/
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p = params;
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*p++ = OSSL_PARAM_construct_octet_string(OSSL_MAC_PARAM_KEY,
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(void *)key, key_len);
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if (custom != NULL && custom_len != 0)
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*p++ = OSSL_PARAM_construct_octet_string(OSSL_MAC_PARAM_CUSTOM,
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(void *)custom, custom_len);
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*p = OSSL_PARAM_construct_end();
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if (!EVP_MAC_CTX_set_params(ctx, params))
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goto err;
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if (!EVP_MAC_init(ctx))
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goto err;
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/*
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* Note: the following optional parameters can be set any time
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* before EVP_MAC_final().
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*/
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p = params;
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*p++ = OSSL_PARAM_construct_int(OSSL_MAC_PARAM_XOF, &xof_enabled);
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*p++ = OSSL_PARAM_construct_int(OSSL_MAC_PARAM_SIZE, &out_len);
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*p = OSSL_PARAM_construct_end();
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if (!EVP_MAC_CTX_set_params(ctx, params))
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goto err;
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/* The update may be called multiple times here for streamed input */
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if (!EVP_MAC_update(ctx, in, in_len))
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goto err;
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if (!EVP_MAC_final(ctx, out, &l, out_len))
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goto err;
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ret = 1;
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err:
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EVP_MAC_CTX_free(ctx);
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return ret;
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}
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=head1 SEE ALSO
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L<EVP_MAC_CTX_get_params(3)>, L<EVP_MAC_CTX_set_params(3)>,
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L<EVP_MAC(3)/PARAMETERS>, L<OSSL_PARAM(3)>
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=head1 COPYRIGHT
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Copyright 2018-2021 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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