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.IX Title "EVP_ASYM_CIPHER-RSA 7ossl"
.TH EVP_ASYM_CIPHER-RSA 7ossl 2026-01-27 3.5.5 OpenSSL
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.nh
.SH NAME
EVP_ASYM_CIPHER\-RSA
\&\- RSA Asymmetric Cipher algorithm support
.SH DESCRIPTION
.IX Header "DESCRIPTION"
Asymmetric Cipher support for the \fBRSA\fR key type.
.SS "RSA Asymmetric Cipher parameters"
.IX Subsection "RSA Asymmetric Cipher parameters"
.IP """pad\-mode"" (\fBOSSL_ASYM_CIPHER_PARAM_PAD_MODE\fR) <UTF8 string>" 4
.IX Item """pad-mode"" (OSSL_ASYM_CIPHER_PARAM_PAD_MODE) <UTF8 string>"
The default provider understands these RSA padding modes in string form:
.RS 4
.IP """none"" (\fBOSSL_PKEY_RSA_PAD_MODE_NONE\fR)" 4
.IX Item """none"" (OSSL_PKEY_RSA_PAD_MODE_NONE)"
.PD 0
.IP """oaep"" (\fBOSSL_PKEY_RSA_PAD_MODE_OAEP\fR)" 4
.IX Item """oaep"" (OSSL_PKEY_RSA_PAD_MODE_OAEP)"
.IP """pkcs1"" (\fBOSSL_PKEY_RSA_PAD_MODE_PKCSV15\fR)" 4
.IX Item """pkcs1"" (OSSL_PKEY_RSA_PAD_MODE_PKCSV15)"
.PD
This padding mode is no longer supported by the FIPS provider for key
agreement and key transport.
(This is a FIPS 140\-3 requirement).
See "OPTIONS" in \fBopenssl\-fipsinstall\fR\|(1) \fB\-rsa_pkcs15_pad_disabled\fR.
.IP """x931"" (\fBOSSL_PKEY_RSA_PAD_MODE_X931\fR)" 4
.IX Item """x931"" (OSSL_PKEY_RSA_PAD_MODE_X931)"
.RE
.RS 4
.RE
.IP """pad\-mode"" (\fBOSSL_ASYM_CIPHER_PARAM_PAD_MODE\fR) <integer>" 4
.IX Item """pad-mode"" (OSSL_ASYM_CIPHER_PARAM_PAD_MODE) <integer>"
The default provider understands these RSA padding modes in integer form:
.RS 4
.IP "1 (\fBRSA_PKCS1_PADDING\fR)" 4
.IX Item "1 (RSA_PKCS1_PADDING)"
This padding mode is no longer supported by the FIPS provider for key
agreement and key transport.
(This is a FIPS 140\-3 requirement)
.IP "3 (\fBRSA_NO_PADDING\fR)" 4
.IX Item "3 (RSA_NO_PADDING)"
.PD 0
.IP "4 (\fBRSA_PKCS1_OAEP_PADDING\fR)" 4
.IX Item "4 (RSA_PKCS1_OAEP_PADDING)"
.IP "5 (\fBRSA_X931_PADDING\fR)" 4
.IX Item "5 (RSA_X931_PADDING)"
.PD
.RE
.RS 4
.Sp
See \fBEVP_PKEY_CTX_set_rsa_padding\fR\|(3) for further details.
.RE
.IP """digest"" (\fBOSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST\fR) <UTF8 string>" 4
.IX Item """digest"" (OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST) <UTF8 string>"
.PD 0
.IP """digest\-props"" (\fBOSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST_PROPS\fR) <UTF8 string>" 4
.IX Item """digest-props"" (OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST_PROPS) <UTF8 string>"
.IP """mgf1\-digest"" (\fBOSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST\fR) <UTF8 string>" 4
.IX Item """mgf1-digest"" (OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST) <UTF8 string>"
.IP """mgf1\-digest\-props"" (\fBOSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS\fR) <UTF8 string>" 4
.IX Item """mgf1-digest-props"" (OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS) <UTF8 string>"
.IP """oaep\-label"" (\fBOSSL_ASYM_CIPHER_PARAM_OAEP_LABEL\fR) <octet string>" 4
.IX Item """oaep-label"" (OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL) <octet string>"
.IP """tls\-client\-version"" (\fBOSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION\fR) <unsigned integer>" 4
.IX Item """tls-client-version"" (OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION) <unsigned integer>"
.PD
See \fBRSA_PKCS1_WITH_TLS_PADDING\fR on the page \fBEVP_PKEY_CTX_set_rsa_padding\fR\|(3).
.IP """tls\-negotiated\-version"" (\fBOSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION\fR) <unsigned integer>" 4
.IX Item """tls-negotiated-version"" (OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION) <unsigned integer>"
See \fBRSA_PKCS1_WITH_TLS_PADDING\fR on the page \fBEVP_PKEY_CTX_set_rsa_padding\fR\|(3).
.Sp
See "Asymmetric Cipher Parameters" in \fBprovider\-asym_cipher\fR\|(7) for more information.
.PP
The OpenSSL FIPS provider also supports the following parameters:
.IP """fips\-indicator"" (\fBOSSL_ASYM_CIPHER_PARAM_FIPS_APPROVED_INDICATOR\fR) <integer>" 4
.IX Item """fips-indicator"" (OSSL_ASYM_CIPHER_PARAM_FIPS_APPROVED_INDICATOR) <integer>"
.PD 0
.IP """key\-check"" (\fBOSSL_ASYM_CIPHER_PARAM_FIPS_KEY_CHECK\fR) <integer>" 4
.IX Item """key-check"" (OSSL_ASYM_CIPHER_PARAM_FIPS_KEY_CHECK) <integer>"
.PD
See "Asymmetric Cipher Parameters" in \fBprovider\-asym_cipher\fR\|(7) for more information.
.IP """pkcs15\-pad\-disabled"" (\fBOSSL_ASYM_CIPHER_PARAM_FIPS_RSA_PKCS15_PAD_DISABLED\fR) <integer>" 4
.IX Item """pkcs15-pad-disabled"" (OSSL_ASYM_CIPHER_PARAM_FIPS_RSA_PKCS15_PAD_DISABLED) <integer>"
The default value of 1 causes an error during encryption if the RSA padding
mode is set to "pkcs1".
Setting this to zero will ignore the error and set the approved
"fips\-indicator" to 0.
This option breaks FIPS compliance if it causes the approved "fips\-indicator"
to return 0.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBEVP_PKEY\-RSA\fR\|(7),
\&\fBEVP_PKEY\fR\|(3),
\&\fBprovider\-asym_cipher\fR\|(7),
\&\fBprovider\-keymgmt\fR\|(7),
\&\fBOSSL_PROVIDER\-default\fR\|(7)
\&\fBOSSL_PROVIDER\-FIPS\fR\|(7)
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright 2022\-2025 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (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
<https://www.openssl.org/source/license.html>.
