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dh_size

API Overview​

DH_size is an API in openssl. This rule belongs to the return value check type. This rule is generated using AURC.

Rule Description​

tip

DH_size() returns the prime size of Diffie-Hellman in bytes, or -1 if B<dh> doesn't hold any key parameters.

info
  • Tags: return value check
  • Parameter Index: N/A
  • CWE Type: CWE-253

Rule Code​

import cpp

class OpenSSLFunctionCall extends FunctionCall {
  OpenSSLFunctionCall() {
    this.getTarget().hasName("DH_size")
  }
}

from OpenSSLFunctionCall call, UnaryOperation uop
where
  uop.getOperator() = "!" and
  uop.getOperand() = call.getAnAccess()
select uop, "This negation checks the return value of DH_size."