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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)
182 lines
5.7 KiB
Plaintext
182 lines
5.7 KiB
Plaintext
=pod
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=head1 NAME
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EVP_KDF-KB - The Key-Based EVP_KDF implementation
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=head1 DESCRIPTION
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The EVP_KDF-KB algorithm implements the Key-Based key derivation function
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(KBKDF). KBKDF derives a key from repeated application of a keyed MAC to an
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input secret (and other optional values).
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=head2 Identity
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"KBKDF" is the name for this implementation; it can be used with the
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EVP_KDF_fetch() function.
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=head2 Supported parameters
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The supported parameters are:
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=over 4
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=item "mode" (B<OSSL_KDF_PARAM_MODE>) <UTF8 string>
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The mode parameter determines which flavor of KBKDF to use - currently the
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choices are "counter" and "feedback". "counter" is the default, and will be
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used if unspecified.
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=item "mac" (B<OSSL_KDF_PARAM_MAC>) <UTF8 string>
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The value is either CMAC, HMAC, KMAC128 or KMAC256.
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=item "digest" (B<OSSL_KDF_PARAM_DIGEST>) <UTF8 string>
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=item "cipher" (B<OSSL_KDF_PARAM_CIPHER>) <UTF8 string>
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=item "properties" (B<OSSL_KDF_PARAM_PROPERTIES>) <UTF8 string>
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=item "key" (B<OSSL_KDF_PARAM_KEY>) <octet string>
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=item "salt" (B<OSSL_KDF_PARAM_SALT>) <octet string>
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=item "info (B<OSSL_KDF_PARAM_INFO>) <octet string>
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=item "seed" (B<OSSL_KDF_PARAM_SEED>) <octet string>
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The seed parameter is unused in counter mode.
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=item "use-l" (B<OSSL_KDF_PARAM_KBKDF_USE_L>) <integer>
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Set to B<0> to disable use of the optional Fixed Input data 'L' (see SP800-108).
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The default value of B<1> will be used if unspecified.
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=item "use-separator" (B<OSSL_KDF_PARAM_KBKDF_USE_SEPARATOR>) <integer>
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Set to B<0> to disable use of the optional Fixed Input data 'zero separator'
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(see SP800-108) that is placed between the Label and Context.
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The default value of B<1> will be used if unspecified.
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=item "r" (B<OSSL_KDF_PARAM_KBKDF_R>) <integer>
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Set the fixed value 'r', indicating the length of the counter in bits.
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Supported values are B<8>, B<16>, B<24>, and B<32>.
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The default value of B<32> will be used if unspecified.
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=back
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Depending on whether mac is CMAC or HMAC, either digest or cipher is required
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(respectively) and the other is unused. They are unused for KMAC128 and KMAC256.
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The parameters key, salt, info, and seed correspond to KI, Label, Context, and
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IV (respectively) in SP800-108. As in that document, salt, info, and seed are
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optional and may be omitted.
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"mac", "digest", cipher" and "properties" are described in
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L<EVP_KDF(3)/PARAMETERS>.
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=head1 NOTES
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A context for KBKDF can be obtained by calling:
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EVP_KDF *kdf = EVP_KDF_fetch(NULL, "KBKDF", NULL);
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EVP_KDF_CTX *kctx = EVP_KDF_CTX_new(kdf);
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The output length of an KBKDF is specified via the C<keylen>
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parameter to the L<EVP_KDF_derive(3)> function.
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Note that currently OpenSSL only implements counter and feedback modes. Other
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variants may be supported in the future.
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=head1 EXAMPLES
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This example derives 10 bytes using COUNTER-HMAC-SHA256, with KI "secret",
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Label "label", and Context "context".
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EVP_KDF *kdf;
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EVP_KDF_CTX *kctx;
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unsigned char out[10];
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OSSL_PARAM params[6], *p = params;
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kdf = EVP_KDF_fetch(NULL, "KBKDF", NULL);
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kctx = EVP_KDF_CTX_new(kdf);
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EVP_KDF_free(kdf);
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*p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
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"SHA2-256", 0);
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*p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_MAC,
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"HMAC", 0);
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*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY,
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"secret", strlen("secret"));
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*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT,
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"label", strlen("label"));
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*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_INFO,
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"context", strlen("context"));
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*p = OSSL_PARAM_construct_end();
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if (EVP_KDF_derive(kctx, out, sizeof(out), params) <= 0)
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error("EVP_KDF_derive");
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EVP_KDF_CTX_free(kctx);
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This example derives 10 bytes using FEEDBACK-CMAC-AES256, with KI "secret",
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Label "label", and IV "sixteen bytes iv".
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EVP_KDF *kdf;
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EVP_KDF_CTX *kctx;
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unsigned char out[10];
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OSSL_PARAM params[8], *p = params;
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unsigned char *iv = "sixteen bytes iv";
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kdf = EVP_KDF_fetch(NULL, "KBKDF", NULL);
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kctx = EVP_KDF_CTX_new(kdf);
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EVP_KDF_free(kdf);
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*p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_CIPHER, "AES256", 0);
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*p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_MAC, "CMAC", 0);
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*p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_MODE, "FEEDBACK", 0);
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*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY,
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"secret", strlen("secret"));
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*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT,
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"label", strlen("label"));
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*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_INFO,
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"context", strlen("context"));
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*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SEED,
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iv, strlen(iv));
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*p = OSSL_PARAM_construct_end();
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if (EVP_KDF_derive(kctx, out, sizeof(out), params) <= 0)
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error("EVP_KDF_derive");
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EVP_KDF_CTX_free(kctx);
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=head1 CONFORMING TO
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NIST SP800-108, IETF RFC 6803, IETF RFC 8009.
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=head1 SEE ALSO
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L<EVP_KDF(3)>,
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L<EVP_KDF_CTX_free(3)>,
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L<EVP_KDF_CTX_get_kdf_size(3)>,
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L<EVP_KDF_derive(3)>,
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L<EVP_KDF(3)/PARAMETERS>
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=head1 HISTORY
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This functionality was added in OpenSSL 3.0.
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Support for KMAC was added in OpenSSL 3.1.
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=head1 COPYRIGHT
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Copyright 2019-2022 The OpenSSL Project Authors. All Rights Reserved.
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Copyright 2019 Red Hat, Inc.
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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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