181 lines
5.9 KiB
Groff
Executable File
181 lines
5.9 KiB
Groff
Executable File
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.\" ========================================================================
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.\"
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.IX Title "RSA-PSS 7"
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.TH RSA-PSS 7 "2020-03-02" "3.0.0-dev" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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RSA\-PSS \- EVP_PKEY RSA\-PSS algorithm support
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The \fBRSA-PSS\fR \s-1EVP_PKEY\s0 implementation is a restricted version of the \s-1RSA\s0
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algorithm which only supports signing, verification and key generation
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using \s-1PSS\s0 padding modes with optional parameter restrictions.
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.PP
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It has associated private key and public key formats.
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.PP
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This algorithm shares several control operations with the \fB\s-1RSA\s0\fR algorithm
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but with some restrictions described below.
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.SS "Signing and Verification"
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.IX Subsection "Signing and Verification"
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Signing and verification is similar to the \fB\s-1RSA\s0\fR algorithm except the
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padding mode is always \s-1PSS\s0. 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 \s-1SHA256\s0, \s-1MGF1\s0 \s-1SHA256\s0
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and minimum salt length 32 then the digest, \s-1MGF1\s0 digest and salt length
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will be set to \s-1SHA256\s0, \s-1SHA256\s0 and 32 respectively.
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.SS "Key Generation"
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.IX Subsection "Key Generation"
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By default no parameter restrictions are placed on the generated key.
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.SH "NOTES"
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.IX Header "NOTES"
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The public key format is documented in \s-1RFC4055\s0.
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.PP
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The PKCS#8 private key format used for RSA-PSS keys is similar to the \s-1RSA\s0
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format except it uses the \fBid-RSASSA-PSS\fR \s-1OID\s0 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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.SH "CONFORMING TO"
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.IX Header "CONFORMING TO"
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\&\s-1RFC\s0 4055
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIEVP_PKEY_CTX_set_rsa_pss_keygen_md\fR\|(3),
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\&\fIEVP_PKEY_CTX_set_rsa_pss_keygen_mgf1_md\fR\|(3),
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\&\fIEVP_PKEY_CTX_set_rsa_pss_keygen_saltlen\fR\|(3),
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\&\fIEVP_PKEY_CTX_new\fR\|(3),
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\&\fIEVP_PKEY_CTX_ctrl_str\fR\|(3),
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\&\fIEVP_PKEY_derive\fR\|(3)
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2017\-2018 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). 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 \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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