mcp-server-semgrep/semgrep-rules/java/lang/security/audit/blowfish-insufficient-key-size.yaml

MCP Server for Semgrep Integration - static code analysis with AI

rules:
- id: blowfish-insufficient-key-size
  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#BLOWFISH_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'
    category: security
    technology:
    - java
    references:
    - https://owasp.org/Top10/A02_2021-Cryptographic_Failures
    subcategory:
    - audit
    likelihood: HIGH
    impact: MEDIUM
    confidence: HIGH
  message: >-
    Using less than 128 bits for Blowfish is considered insecure. Use 128 bits
    or more, or switch to use AES instead.
  severity: WARNING
  languages:
  - java
  patterns:
  - pattern: |
      $KEYGEN = KeyGenerator.getInstance("Blowfish");
      ...
      $KEYGEN.init($SIZE);
  - metavariable-comparison:
      metavariable: $SIZE
      comparison: $SIZE < 128