Hash Tool
What is Hash Algorithm?
A hash algorithm is a mathematical function that converts input data of arbitrary length into a fixed-length output. It has characteristics such as one-way (irreversible), deterministic (same input produces same output), and avalanche effect (small input changes cause large output changes).
Supported Algorithms
MD5
Output Length: 128 bits (32 hex characters)
Security: Compromised, not recommended for security scenarios
Use Cases: File verification, data deduplication (non-security scenarios)
SHA-1
Output Length: 160 bits (40 hex characters)
Security: Compromised, not recommended for new projects
Use Cases: Git version control, legacy system compatibility
SHA-224
Output Length: 224 bits (56 hex characters)
Security: Good security, but less commonly used
Use Cases: Specific protocol requirements, embedded systems
SHA-256
Output Length: 256 bits (64 hex characters)
Security: Currently secure, widely used
Use Cases: Password storage, digital signatures, blockchain
SHA-384
Output Length: 384 bits (96 hex characters)
Security: High security, good performance
Use Cases: High-security scenarios, SSL/TLS
SHA-512
Output Length: 512 bits (128 hex characters)
Security: Highest security, suitable for high-requirement scenarios
Use Cases: High-security password storage, digital certificates
SHA-3
Output Length: 256 bits (64 hex characters)
Security: Latest standard, quantum-resistant
Use Cases: Future security standards, advanced cryptographic applications
RIPEMD-160
Output Length: 160 bits (40 hex characters)
Security: Good security, but less commonly used
Use Cases: Bitcoin address generation, specific cryptographic applications
SM3
Output Length: 256 bits (64 hex characters)
Security: Chinese national cryptographic algorithm, compliant with GM standards
Use Cases: GM applications, government systems, financial systems
Common Use Cases
Data Integrity Verification
Verify whether data has been tampered with during transmission or storage
Password Storage
Securely store user passwords (requires salt)
Digital Signature
Verify data source and integrity
File Verification
Verify the integrity and authenticity of downloaded files
Blockchain
Proof of work, transaction verification, etc.
Cache Keys
Generate unique cache keys
Security Considerations
Collision Resistance
MD5 and SHA-1 have been proven to have collision vulnerabilities and should not be used in security-sensitive scenarios
Salt Usage
Random salt should be used when storing passwords to prevent rainbow table attacks
Algorithm Choice
New projects are recommended to use SHA-256 or stronger algorithms