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.\" ========================================================================
.\"
.IX Title "RSA-PSS 7"
.TH RSA-PSS 7 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
RSA\-PSS \- EVP_PKEY RSA\-PSS algorithm support
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fBRSA-PSS\fR \s-1EVP_PKEY\s0 implementation is a restricted version of the \s-1RSA\s0
algorithm which only supports signing, verification and key generation
using \s-1PSS\s0 padding modes with optional parameter restrictions.
.PP
It has associated private key and public key formats.
.PP
This algorithm shares several control operations with the \fB\s-1RSA\s0\fR algorithm
but with some restrictions described below.
.SS "Signing and Verification"
.IX Subsection "Signing and Verification"
Signing and verification is similar to the \fB\s-1RSA\s0\fR algorithm except the
padding mode is always \s-1PSS.\s0 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 \s-1SHA256, MGF1 SHA256\s0
and minimum salt length 32 then the digest, \s-1MGF1\s0 digest and salt length
will be set to \s-1SHA256, SHA256\s0 and 32 respectively.
.SS "Key Generation"
.IX Subsection "Key Generation"
By default no parameter restrictions are placed on the generated key.
.SH "NOTES"
.IX Header "NOTES"
The public key format is documented in \s-1RFC4055.\s0
.PP
The PKCS#8 private key format used for RSA-PSS keys is similar to the \s-1RSA\s0
format except it uses the \fBid-RSASSA-PSS\fR \s-1OID\s0 and the parameters field, if
present, restricts the key parameters in the same way as the public key.
.SH "CONFORMING TO"
.IX Header "CONFORMING TO"
\&\s-1RFC 4055\s0
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBEVP_PKEY_CTX_set_rsa_pss_keygen_md\fR\|(3),
\&\fBEVP_PKEY_CTX_set_rsa_pss_keygen_mgf1_md\fR\|(3),
\&\fBEVP_PKEY_CTX_set_rsa_pss_keygen_saltlen\fR\|(3),
\&\fBEVP_PKEY_CTX_new\fR\|(3),
\&\fBEVP_PKEY_CTX_ctrl_str\fR\|(3),
\&\fBEVP_PKEY_derive\fR\|(3)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2017\-2018 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.

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