Updated: 2025/Nov/16

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EVP_ASYM_CIPHER-RSA(7)              OpenSSL             EVP_ASYM_CIPHER-RSA(7)


NAME
       EVP_ASYM_CIPHER-RSA - RSA Asymmetric Cipher algorithm support

DESCRIPTION
       Asymmetric Cipher support for the RSA key type.

   RSA Asymmetric Cipher parameters
       "pad-mode" (OSSL_ASYM_CIPHER_PARAM_PAD_MODE) <UTF8 string>
           The default provider understands these RSA padding modes in string
           form:

           "none" (OSSL_PKEY_RSA_PAD_MODE_NONE)
           "oaep" (OSSL_PKEY_RSA_PAD_MODE_OAEP)
           "pkcs1" (OSSL_PKEY_RSA_PAD_MODE_PKCSV15)
               This padding mode is no longer supported by the FIPS provider
               for key agreement and key transport.  (This is a FIPS 140-3
               requirement)

           "x931" (OSSL_PKEY_RSA_PAD_MODE_X931)

       "pad-mode" (OSSL_ASYM_CIPHER_PARAM_PAD_MODE) <integer>
           The default provider understands these RSA padding modes in integer
           form:

           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)

           3 (RSA_NO_PADDING)
           4 (RSA_PKCS1_OAEP_PADDING)
           5 (RSA_X931_PADDING)

           See EVP_PKEY_CTX_set_rsa_padding(3) for further details.

       "digest" (OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST) <UTF8 string>
       "digest-props" (OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST_PROPS) <UTF8 string>
       "mgf1-digest" (OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST) <UTF8 string>
       "mgf1-digest-props" (OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS) <UTF8
       string>
       "oaep-label" (OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL) <octet string>
       "tls-client-version" (OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION)
       <unsigned integer>
           See RSA_PKCS1_WITH_TLS_PADDING on the page
           EVP_PKEY_CTX_set_rsa_padding(3).

       "tls-negotiated-version" (OSSL_ASYM_CIPHER_PARAM_TLS_CLIENT_VERSION)
       <unsigned integer>
           See RSA_PKCS1_WITH_TLS_PADDING on the page
           EVP_PKEY_CTX_set_rsa_padding(3).

           See "Asymmetric Cipher Parameters" in provider-asym_cipher(7) for
           more information.

       The OpenSSL FIPS provider also supports the following parameters:

       "fips-indicator" (OSSL_ASYM_CIPHER_PARAM_FIPS_APPROVED_INDICATOR)
       <integer>
       "key-check" (OSSL_ASYM_CIPHER_PARAM_FIPS_KEY_CHECK) <integer>
           See "Asymmetric Cipher Parameters" in provider-asym_cipher(7) for
           more information.

       "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.

SEE ALSO
       EVP_PKEY-RSA(7), EVP_PKEY(3), provider-asym_cipher(7),
       provider-keymgmt(7), OSSL_PROVIDER-default(7) OSSL_PROVIDER-FIPS(7)

COPYRIGHT
       Copyright 2022-2024 The OpenSSL Project Authors. All Rights Reserved.

       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>.

3.5.1                             2025-07-01            EVP_ASYM_CIPHER-RSA(7)