Updated: 2022/Sep/29

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RSA-PSS(7)                          OpenSSL                         RSA-PSS(7)

       RSA-PSS - EVP_PKEY RSA-PSS algorithm support

       The RSA-PSS EVP_PKEY implementation is a restricted version of the RSA
       algorithm which only supports signing, verification and key generation
       using PSS padding modes with optional parameter restrictions.

       It has associated private key and public key formats.

       This algorithm shares several control operations with the RSA algorithm
       but with some restrictions described below.

   Signing and Verification
       Signing and verification is similar to the RSA algorithm except the
       padding mode is always PSS. If the key in use has parameter
       restrictions then the corresponding signature parameters are set to the
       restrictions: for example, if the key can only be used with digest
       SHA256, MGF1 SHA256 and minimum salt length 32 then the digest, MGF1
       digest and salt length will be set to SHA256, SHA256 and 32

   Key Generation
       By default no parameter restrictions are placed on the generated key.

       The public key format is documented in RFC4055.

       The PKCS#8 private key format used for RSA-PSS keys is similar to the
       RSA format except it uses the id-RSASSA-PSS OID and the parameters
       field, if present, restricts the key parameters in the same way as the
       public key.

       RFC 4055

       EVP_PKEY_CTX_set_rsa_pss_keygen_saltlen(3), EVP_PKEY_CTX_new(3),
       EVP_PKEY_CTX_ctrl_str(3), EVP_PKEY_derive(3)

       Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the OpenSSL license (the "License").  You may not use
       this file except in compliance with the License.  You can obtain a copy
       in the file LICENSE in the source distribution or at

1.1.1i                            2018-09-23                        RSA-PSS(7)