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133 .\" ========================================================================
135 .IX Title "RSA-PSS 7"
136 .TH RSA-PSS 7 "2021-08-24" "1.1.1l" "OpenSSL"
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142 RSA\-PSS \- EVP_PKEY RSA\-PSS algorithm support
144 .IX Header "DESCRIPTION"
145 The \fBRSA-PSS\fR \s-1EVP_PKEY\s0 implementation is a restricted version of the \s-1RSA\s0
146 algorithm which only supports signing, verification and key generation
147 using \s-1PSS\s0 padding modes with optional parameter restrictions.
149 It has associated private key and public key formats.
151 This algorithm shares several control operations with the \fB\s-1RSA\s0\fR algorithm
152 but with some restrictions described below.
153 .SS "Signing and Verification"
154 .IX Subsection "Signing and Verification"
155 Signing and verification is similar to the \fB\s-1RSA\s0\fR algorithm except the
156 padding mode is always \s-1PSS.\s0 If the key in use has parameter restrictions then
157 the corresponding signature parameters are set to the restrictions:
158 for example, if the key can only be used with digest \s-1SHA256, MGF1 SHA256\s0
159 and minimum salt length 32 then the digest, \s-1MGF1\s0 digest and salt length
160 will be set to \s-1SHA256, SHA256\s0 and 32 respectively.
162 .IX Subsection "Key Generation"
163 By default no parameter restrictions are placed on the generated key.
166 The public key format is documented in \s-1RFC4055.\s0
168 The PKCS#8 private key format used for RSA-PSS keys is similar to the \s-1RSA\s0
169 format except it uses the \fBid-RSASSA-PSS\fR \s-1OID\s0 and the parameters field, if
170 present, restricts the key parameters in the same way as the public key.
172 .IX Header "CONFORMING TO"
175 .IX Header "SEE ALSO"
176 \&\fBEVP_PKEY_CTX_set_rsa_pss_keygen_md\fR\|(3),
177 \&\fBEVP_PKEY_CTX_set_rsa_pss_keygen_mgf1_md\fR\|(3),
178 \&\fBEVP_PKEY_CTX_set_rsa_pss_keygen_saltlen\fR\|(3),
179 \&\fBEVP_PKEY_CTX_new\fR\|(3),
180 \&\fBEVP_PKEY_CTX_ctrl_str\fR\|(3),
181 \&\fBEVP_PKEY_derive\fR\|(3)
183 .IX Header "COPYRIGHT"
184 Copyright 2017\-2018 The OpenSSL Project Authors. All Rights Reserved.
186 Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
187 this file except in compliance with the License. You can obtain a copy
188 in the file \s-1LICENSE\s0 in the source distribution or at
189 <https://www.openssl.org/source/license.html>.