the library

8.8 Enabling/Disabling RSAES-PKCS1-v1_5
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This option can be used to enable/disable RSA PKCS1 v1.5 encryption and
decryption in GnuTLS. The RSAES-PKCS1-v1_5 is enabled by default.

Below example shows how to explicitely disable the RSAES-PKCS1-v1_5.
     [overrides]
     allow-rsa-pkcs1-encrypt = false