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62 lines
1.9 KiB
Plaintext
62 lines
1.9 KiB
Plaintext
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=pod
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=head1 NAME
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RSA-PSS - EVP_PKEY RSA-PSS algorithm support
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=head1 DESCRIPTION
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The B<RSA-PSS> EVP_PKEY implementation is a restricted version of the RSA
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algorithm which only supports signing, verification and key generation
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using PSS padding modes with optional parameter restrictions.
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It has associated private key and public key formats.
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This algorithm shares several control operations with the B<RSA> algorithm
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but with some restrictions described below.
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=head2 Signing and Verification
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Signing and verification is similar to the B<RSA> algorithm except the
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padding mode is always PSS. If the key in use has parameter restrictions then
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the corresponding signature parameters are set to the restrictions:
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for example, if the key can only be used with digest SHA256, MGF1 SHA256
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and minimum salt length 32 then the digest, MGF1 digest and salt length
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will be set to SHA256, SHA256 and 32 respectively.
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=head2 Key Generation
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By default no parameter restrictions are placed on the generated key.
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=head1 NOTES
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The public key format is documented in RFC4055.
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The PKCS#8 private key format used for RSA-PSS keys is similar to the RSA
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format except it uses the B<id-RSASSA-PSS> OID and the parameters field, if
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present, restricts the key parameters in the same way as the public key.
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=head1 CONFORMING TO
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RFC 4055
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=head1 SEE ALSO
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L<EVP_PKEY_CTX_set_rsa_pss_keygen_md(3)>,
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L<EVP_PKEY_CTX_set_rsa_pss_keygen_mgf1_md(3)>,
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L<EVP_PKEY_CTX_set_rsa_pss_keygen_saltlen(3)>,
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L<EVP_PKEY_CTX_new(3)>,
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L<EVP_PKEY_CTX_ctrl_str(3)>,
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L<EVP_PKEY_derive(3)>
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=head1 COPYRIGHT
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Copyright 2017-2018 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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