rules:
- id: use-of-weak-rsa-key
  message: RSA keys should be at least 2048 bits based on NIST recommendation.
  languages: [kt]
  severity: WARNING
  metadata:
    cwe:
    - 'CWE-326: Inadequate Encryption Strength'
    owasp:
    - A03:2017 - Sensitive Data Exposure
    - A02:2021 - Cryptographic Failures
    source-rule-url: https://find-sec-bugs.github.io/bugs.htm#RSA_KEY_SIZE
    asvs:
      section: V6 Stored Cryptography Verification Requirements
      control_id: 6.2.5 Insecure Algorithm
      control_url: https://github.com/OWASP/ASVS/blob/master/4.0/en/0x14-V6-Cryptography.md#v62-algorithms
      version: '4'
    references:
    - https://cheatsheetseries.owasp.org/cheatsheets/Cryptographic_Storage_Cheat_Sheet.html#algorithms
    category: security
    technology:
    - kotlin
    subcategory:
    - audit
    likelihood: HIGH
    impact: MEDIUM
    confidence: HIGH
  patterns:
  - pattern-either:
    - pattern: |
        $KEY = $G.getInstance("RSA")
        ...
        $KEY.initialize($BITS)
  - metavariable-comparison:
      metavariable: $BITS
      comparison: $BITS < 2048