EVP_Cipher

API 概述

EVP_Cipher 是 openssl 中的一个API。该规属于return value check 类型。该规则是使用 AURC 生成的。

规则描述

提示

EVP_Cipher() returns the amount of encrypted / decrypted bytes, or -1 on failure if the flag B<EVP_CIPH_FLAG_CUSTOM_CIPHER> is set for the cipher. EVP_Cipher() returns 1 on success or 0 on failure, if the flag B<EVP_CIPH_FLAG_CUSTOM_CIPHER> is not set for the cipher.

信息

标签：return value check

参数下标：N/A

CWE类别：CWE-253

规则代码

import cpp

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

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