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SHA1 Hash Generator

Generate SHA1 hashes for text and files, verify integrity with checksum comparison

Input Generate

Characters: 0
Or Upload File

Statistics

Input Length
0 chars
Hash Length
0 chars

Output

SHA1 Hash

How to use

Generate Mode: Enter text or upload a file to generate its SHA1 hash
Verify Mode: Enter text and expected hash to verify integrity
File Support: Upload any file type for SHA1 hash generation
Real-time: Hash generation happens automatically as you type
Verification: Instant verification when expected hash is provided
Export: Copy to clipboard or download hash as text file

💡 Pro Tips

SHA1 is commonly used for file integrity verification and version control systems like Git. While more secure than MD5, consider using SHA-256 for security-critical applications.

Complete Guide to SHA1 Hashing

What is SHA1?

SHA-1 (Secure Hash Algorithm 1) is a cryptographic hash function designed by the National Security Agency (NSA) and published by NIST in 1995. It produces a 160-bit (40-character hexadecimal) hash value, typically expressed as a 40-character string.

How SHA1 Hashing Works

SHA-1 processes input data through a series of mathematical operations including bitwise operations, modular addition, and logical functions. It divides the input into 512-bit blocks and produces a fixed-size 160-bit hash through 80 rounds of processing.

SHA1 Properties:

Deterministic: Same input always produces the same hash
Fixed Size: Always produces 160-bit (40 hex character) output
Irreversible: Cannot recover original data from hash
Collision Resistant: Extremely unlikely to find two different inputs with same hash

Common Use Cases for SHA1

Version Control

  • Git commit hashes
  • File change tracking
  • Mercurial version control
  • Repository integrity

File Integrity

  • Verify downloaded files
  • Check file modifications
  • Compare file versions
  • Digital signatures

Digital Certificates

  • SSL/TLS certificates
  • Code signing
  • Certificate authorities

Data Deduplication

  • Identify duplicate data
  • Optimize storage systems
  • Cache key generation

SHA1 vs Other Hash Functions

AlgorithmOutput SizeSecurity StatusSpeed
MD5128 bits (32 chars)DeprecatedVery Fast
SHA-1160 bits (40 chars)Legacy - Limited UseFast
SHA-256256 bits (64 chars)SecureModerate
SHA-3Variable (224-512 bits)Very SecureModerate

How to Use the SHA1 Hash Generator

1

Choose Operation Mode

Select "Generate Hash" to create SHA1 hashes or "Verify Hash" to check hash integrity.

2

Input Your Data

For generation: Enter text or upload a file. For verification: Enter text and provide the expected hash.

3

View Results

The SHA1 hash appears instantly. In verify mode, you'll see if the hashes match.

4

Copy or Export

Use the Copy button for clipboard access, or Download to save the hash as a text file.

Important Security Considerations

!

SHA-1 Security Status

SHA-1 is considered cryptographically weak for security-critical applications. Collision attacks have been demonstrated, making it unsuitable for digital signatures and certificates in modern systems.

When to Avoid SHA-1
  • Password storage (use bcrypt, scrypt, or Argon2)
  • New digital signatures (use SHA-256 or higher)
  • New SSL/TLS certificates (use SHA-256)
  • Security protocols requiring collision resistance
When SHA-1 is Still Useful
  • Legacy system compatibility
  • Git repository integrity (historical)
  • File integrity checking for non-security purposes
  • Simple checksums where collision resistance isn't critical

SHA1 Hash Examples

Empty string: eea339da0d4b6b5eefbf5532901860950907d8af
"a": 68b65e413ca482979b9b97733c2d9bf5f9b6e728
"hello": a175e8d64dd5e609f65b0d5a882c6a54f0d99d1a
"Hello, World!": b94b97451bc7f615458f24bd4f3f89f696749971

Implementation Note: This tool uses a JavaScript implementation of the SHA-1 algorithm for browser compatibility. While functional for basic hashing needs, it processes data client-side for privacy and security.