NAME

       EVP_SIGNATURE-RSA - The EVP_PKEY RSA signature implementation

DESCRIPTION

       Support for computing RSA signatures.  See EVP_PKEY-RSA(7) for information related to RSA
       keys.

   Signature Parameters
       The following signature parameters can be set using EVP_PKEY_CTX_set_params().  This may
       be called after EVP_PKEY_sign_init() or EVP_PKEY_verify_init(), and before calling
       EVP_PKEY_sign() or EVP_PKEY_verify().

       "digest" (OSSL_SIGNATURE_PARAM_DIGEST) <UTF8 string>
       "properties" (OSSL_SIGNATURE_PARAM_PROPERTIES) <UTF8 string>
           These common parameters are described in provider-signature(7).

       "pad-mode" (OSSL_SIGNATURE_PARAM_PAD_MODE) <UTF8 string>
           The type of padding to be used. Its value can be one of the following:

           "none" (OSSL_PKEY_RSA_PAD_MODE_NONE)
           "pkcs1" (OSSL_PKEY_RSA_PAD_MODE_PKCSV15)
           "x931" (OSSL_PKEY_RSA_PAD_MODE_X931)
           "pss" (OSSL_PKEY_RSA_PAD_MODE_PSS)
       "mgf1-digest" (OSSL_SIGNATURE_PARAM_MGF1_DIGEST) <UTF8 string>
           The digest algorithm name to use for the maskGenAlgorithm used by "pss" mode.

       "mgf1-properties" (OSSL_SIGNATURE_PARAM_MGF1_PROPERTIES) <UTF8 string>
           Sets the name of the property query associated with the "mgf1-digest" algorithm.  NULL
           is used if this optional value is not set.

       "saltlen" (OSSL_SIGNATURE_PARAM_PSS_SALTLEN) <integer> or <UTF8 string>
           The "pss" mode minimum salt length. The value can either be an integer, a string value
           representing a number or one of the following string values:

           "digest" (OSSL_PKEY_RSA_PSS_SALT_LEN_DIGEST)
               Use the same length as the digest size.

           "max" (OSSL_PKEY_RSA_PSS_SALT_LEN_MAX)
               Use the maximum salt length.

           "auto" (OSSL_PKEY_RSA_PSS_SALT_LEN_AUTO)
               Auto detect the salt length.

       The following signature parameters can be retrieved using EVP_PKEY_CTX_get_params().

       "algorithm-id" (OSSL_SIGNATURE_PARAM_ALGORITHM_ID) <octet string>
           This common parameter is described in provider-signature(7).

       "digest" (OSSL_SIGNATURE_PARAM_DIGEST) <UTF8 string>
       "pad-mode" (OSSL_SIGNATURE_PARAM_PAD_MODE) <UTF8 string>
       "mgf1-digest" (OSSL_SIGNATURE_PARAM_MGF1_DIGEST) <UTF8 string>
       "saltlen" (OSSL_SIGNATURE_PARAM_PSS_SALTLEN) <integer> or <UTF8 string>
           These parameters are as described above.

SEE ALSO

       EVP_PKEY_CTX_set_params(3), EVP_PKEY_sign(3), EVP_PKEY_verify(3), provider-signature(7),

COPYRIGHT

       Copyright 2020-2021 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>.