SHA-1 Generator

sha1

The sha1 function computes a SHA-1 digest of the given string using a pure JavaScript implementation.

Function Signature

sha1(msg: string): string

Parameters

Return Value

Returns the SHA-1 hash as a 40-character hexadecimal string.

Example Usage

Characteristics

• Pure JavaScript implementation - runs on any JavaScript engine
• Deterministic output - same input always produces same output
• 40-character hex output - fixed length regardless of input size
• One-way function - cannot be reversed to obtain original input

Common Uses

• Checksum verification
• Git commit hashing
• Data integrity checking
• UUID v5 generation (combined with namespaces)

Security Note

SHA-1 is no longer considered secure against well-funded attackers. For security-sensitive applications, use SHA-256 or stronger hashing algorithms.

Internal Usage

This function is used internally for UUID v5 generation:

// Used inside UUID v5
const digest = sha1(namespace + name);