| 1 | =pod
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| 2 |
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| 3 | =head1 NAME
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| 4 |
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| 5 | RSA-PSS - EVP_PKEY RSA-PSS algorithm support
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| 6 |
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| 7 | =head1 DESCRIPTION
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| 8 |
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| 9 | The B<RSA-PSS> EVP_PKEY implementation is a restricted version of the RSA
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| 10 | algorithm which only supports signing, verification and key generation
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| 11 | using PSS padding modes with optional parameter restrictions.
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| 12 |
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| 13 | It has associated private key and public key formats.
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| 14 |
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| 15 | This algorithm shares several control operations with the B<RSA> algorithm
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| 16 | but with some restrictions described below.
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| 17 |
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| 18 | =head2 Signing and Verification
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| 19 |
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| 20 | Signing and verification is similar to the B<RSA> algorithm except the
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| 21 | padding mode is always PSS. If the key in use has parameter restrictions then
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| 22 | the corresponding signature parameters are set to the restrictions:
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| 23 | for example, if the key can only be used with digest SHA256, MGF1 SHA256
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| 24 | and minimum salt length 32 then the digest, MGF1 digest and salt length
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| 25 | will be set to SHA256, SHA256 and 32 respectively.
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| 26 |
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| 27 | =head2 Key Generation
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| 28 |
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| 29 | By default no parameter restrictions are placed on the generated key.
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| 30 |
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| 31 | =head1 NOTES
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| 32 |
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| 33 | The public key format is documented in RFC4055.
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| 34 |
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| 35 | The PKCS#8 private key format used for RSA-PSS keys is similar to the RSA
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| 36 | format except it uses the B<id-RSASSA-PSS> OID and the parameters field, if
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| 37 | present, restricts the key parameters in the same way as the public key.
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| 38 |
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| 39 | =head1 CONFORMING TO
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| 40 |
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| 41 | RFC 4055
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| 42 |
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| 43 | =head1 SEE ALSO
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| 44 |
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| 45 | L<EVP_PKEY_CTX_set_rsa_pss_keygen_md(3)>,
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| 46 | L<EVP_PKEY_CTX_set_rsa_pss_keygen_mgf1_md(3)>,
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| 47 | L<EVP_PKEY_CTX_set_rsa_pss_keygen_saltlen(3)>,
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| 48 | L<EVP_PKEY_CTX_new(3)>,
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| 49 | L<EVP_PKEY_CTX_ctrl_str(3)>,
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| 50 | L<EVP_PKEY_derive(3)>
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| 51 |
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| 52 | =head1 COPYRIGHT
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| 53 |
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| 54 | Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
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| 55 |
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| 56 | Licensed under the OpenSSL license (the "License"). You may not use
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| 57 | this file except in compliance with the License. You can obtain a copy
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| 58 | in the file LICENSE in the source distribution or at
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| 59 | L<https://www.openssl.org/source/license.html>.
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| 60 |
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| 61 | =cut
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