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e7abc2118f
Reviewed-by: Tim Hudson <tjh@openssl.org> Reviewed-by: Tomas Mraz <tomas@openssl.org> (Merged from https://github.com/openssl/openssl/pull/23762)
127 lines
4.1 KiB
Plaintext
127 lines
4.1 KiB
Plaintext
=pod
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=head1 NAME
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EVP_SIGNATURE-DSA
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- The B<EVP_PKEY> DSA signature implementation
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=head1 DESCRIPTION
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Support for computing DSA signatures. The signature produced with
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L<EVP_PKEY_sign(3)> is DER encoded ASN.1 in the form described in
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RFC 3279, section 2.2.2.
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See L<EVP_PKEY-DSA(7)> for information related to DSA keys.
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As part of FIPS 140-3 DSA is not longer FIPS approved for key generation and
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signature validation, but is still allowed for signature verification.
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=head2 Algorithm Names
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In this list, names are grouped together to signify that they are the same
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algorithm having multiple names. This also includes the OID in canonical
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decimal form (which means that they are possible to fetch if the caller has a
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mere OID which came out in this form after a call to L<OBJ_obj2txt(3)>).
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=over 4
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=item "DSA", "dsaEncryption", "1.2.840.10040.4.1"
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The base signature algorithm, supported explicitly fetched with
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L<EVP_PKEY_sign_init_ex2(3)>, and implicitly fetched (through
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L<EC keys|EVP_PKEY-EC(7)>) with L<EVP_DigestSignInit(3)> and
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L<EVP_DigestVerifyInit(3)>.
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It can't be used with L<EVP_PKEY_sign_message_init(3)>
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=item "DSA-SHA1", "DSA-SHA-1", "dsaWithSHA1", "1.2.840.10040.4.3"
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=item "DSA-SHA2-224", "DSA-SHA224", "dsa_with_SHA224", "2.16.840.1.101.3.4.3.1"
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=item "DSA-SHA2-256", "DSA-SHA256", "dsa_with_SHA256", "2.16.840.1.101.3.4.3.2"
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=item "DSA-SHA2-384", "DSA-SHA384", "dsa_with_SHA384", "id-dsa-with-sha384", "1.2.840.1.101.3.4.3.3"
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=item "DSA-SHA2-512", "DSA-SHA512", "dsa_with_SHA512", "id-dsa-with-sha512", "1.2.840.1.101.3.4.3.4"
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=item "DSA-SHA3-224", "dsa_with_SHA3-224", "id-dsa-with-sha3-224", "2.16.840.1.101.3.4.3.5"
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=item "DSA-SHA3-256", "dsa_with_SHA3-256", "id-dsa-with-sha3-256", "2.16.840.1.101.3.4.3.6"
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=item "DSA-SHA3-384", "dsa_with_SHA3-384", "id-dsa-with-sha3-384", "2.16.840.1.101.3.4.3.7"
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=item "DSA-SHA3-512", "dsa_with_SHA3-512", "id-dsa-with-sha3-512", "2.16.840.1.101.3.4.3.8"
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DSA signature schemes with diverse message digest algorithms. They are all
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supported explicitly fetched with L<EVP_PKEY_sign_init_ex2(3)> and
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L<EVP_PKEY_sign_message_init(3)>.
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=back
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=head2 Signature Parameters
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The following signature parameters can be set using EVP_PKEY_CTX_set_params().
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This may be called after EVP_PKEY_sign_init() or EVP_PKEY_verify_init(),
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and before calling EVP_PKEY_sign() or EVP_PKEY_verify(). They may also be set
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using EVP_PKEY_sign_init_ex() or EVP_PKEY_verify_init_ex().
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=over 4
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=item "digest" (B<OSSL_SIGNATURE_PARAM_DIGEST>) <UTF8 string>
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=item "properties" (B<OSSL_SIGNATURE_PARAM_PROPERTIES>) <UTF8 string>
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These two are not supported with the DSA signature schemes that already
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include a message digest algorithm, See L</Algorithm Names> above.
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=item "nonce-type" (B<OSSL_SIGNATURE_PARAM_NONCE_TYPE>) <unsigned integer>
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=item "key-check" (B<OSSL_SIGNATURE_PARAM_FIPS_KEY_CHECK>) <integer>
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=item "digest-check" (B<OSSL_SIGNATURE_PARAM_FIPS_DIGEST_CHECK>) <integer>
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=item "sign-check" (B<OSSL_SIGNATURE_PARAM_FIPS_SIGN_CHECK>) <int>
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The settable parameters are described in L<provider-signature(7)>.
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=back
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The following signature parameters can be retrieved using
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EVP_PKEY_CTX_get_params().
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=over 4
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=item "algorithm-id" (B<OSSL_SIGNATURE_PARAM_ALGORITHM_ID>) <octet string>
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=item "digest" (B<OSSL_SIGNATURE_PARAM_DIGEST>) <UTF8 string>
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=item "nonce-type" (B<OSSL_SIGNATURE_PARAM_NONCE_TYPE>) <unsigned integer>
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=item "fips-indicator" (B<OSSL_SIGNATURE_PARAM_FIPS_APPROVED_INDICATOR>) <integer>
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The gettable parameters are described in L<provider-signature(7)>.
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=back
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=head1 SEE ALSO
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L<EVP_PKEY_CTX_set_params(3)>,
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L<EVP_PKEY_sign(3)>,
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L<EVP_PKEY_verify(3)>,
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L<provider-signature(7)>,
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=head1 HISTORY
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DSA Key generation and signature generation are no longer FIPS approved in
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OpenSSL 3.4. See L<fips_module(7)/FIPS indicators> for more information.
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=head1 COPYRIGHT
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Copyright 2020-2024 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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