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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​

ParameterTypeDescription
msgstringInput text to hash.

Return Value​

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

Example Usage​

import { sha1 } from 'nhb-toolbox/hash';

const hash = sha1("hello");
// → "6c530757b6d81f398aacc759ac2bd0cddc9d015e"

const emptyHash = sha1("");
// → "da39a3ee5e6b4b0d3255bfef95601890afd80709"

const passwordHash = sha1("mypassword123");
// → "490f217a586af7c3974123f73df9cf5cb74aa923"

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
Compatibility Note

The output may differ from other SHA-1 implementations due to algorithmic or encoding variations, but is consistent within this implementation.

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);