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evp_pkey_digestsign_supports_digest

API Overview​

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

Rule Description​

tip

The EVP_PKEY_digestsign_supports_digest() function returns 1 if the message digest algorithm identified by I<name> can be used for public key signature operations associated with key I<pkey> and 0 if it cannot be used. It returns a negative value for failure.

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("EVP_PKEY_digestsign_supports_digest")
  }
}

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