sha1dc ☆
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Description:
Tool to detect SHA-1 collisions in files, including SHAttered
Type: Formula  |  Tracked Since: Dec 28, 2025
Links: Homepage  |  formulae.brew.sh
Category: Security
Tags: security cryptography hashing integrity cli
Install: brew install sha1dc
About:
Sha1dc is a specialized utility designed to identify cryptographic collisions in SHA-1 hashes, specifically targeting the SHAttered attack vector. It integrates collision detection directly into the hashing process, ensuring that files with known collision vulnerabilities are flagged immediately. This tool is essential for verifying the integrity of legacy archives and systems that still rely on SHA-1 checksums.
Key Features:
  • Detects the specific SHAttered collision attack
  • Compatible with standard SHA-1 hashing interfaces
  • Provides a drop-in replacement for vulnerable SHA-1 implementations
  • Outputs detailed collision warnings for compromised files
Use Cases:
  • Auditing software repositories for vulnerable dependencies
  • Verifying the integrity of historical git commits
  • Scanning backup archives for collision-based corruption
Alternatives:
  • shasum – Standard system tool for generating SHA-1 hashes, but lacks collision detection capabilities.
  • OpenSSL – Provides general cryptographic functions but requires specific flags to detect collisions.
Version History
Detected Version Rev Change Commit
Sep 15, 2025 11:00pm 0 VERSION_BUMP 585207c7
Sep 14, 2024 7:16pm 0 VERSION_BUMP 49354162
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