Hash Generator - CalcHub

Input

Text / Data

Data is processed locally. Sensitive information should never be pasted into unknown tools.

Algorithm

SHA-1 is deprecated for security-sensitive contexts; use SHA-256 or stronger when possible.

Output Encoding

Formatting

Digest

🔁

Hash Output

—

Digest length

🧮

Algorithm

—

🕒

Execution Time

—

Approximate elapsed time.

Algorithm

Digest Length

Security Status

SHA-1

160 bits

Collision attacks practical; avoid for new systems.

SHA-256

256 bits

Current standard for integrity checking.

SHA-384

384 bits

Strongly recommended for high-assurance needs.

SHA-512

512 bits

Higher resistance at cost of output length.

💡 Notes

Hash functions are one-way and cannot be reversed—store securely.
Use key-stretching (PBKDF2, bcrypt, scrypt, Argon2) for password handling.
Always salt hashes to protect against rainbow table attacks.
Verify algorithm requirements for compliance (e.g., FIPS, NIST).

📖 How to Use

Enter text, choose a SHA algorithm, pick output encoding, and generate the digest. Copy or export the result, keeping in mind hashes are not encryption and should be combined with salts/key stretching for passwords.

🧮 Formula Reference

Digest = SubtleCrypto.digest(algorithm, data), where algorithm ∈ {SHA-1, SHA-256, SHA-384, SHA-512}.
Hex output: convert each byte to two-character hexadecimal (byte.toString(16).padStart(2,'0')).
Base64 output: encode binary via btoa after constructing a binary string from the byte array.
Digest length corresponds to algorithm (160, 256, 384, 512 bits respectively).

🔗 References

NIST FIPS 180-4: Secure Hash Standard.
NIST SP 800-131A Rev.2: Transitioning the Use of Cryptographic Algorithms.
MDN Web Docs: Web Crypto API – SubtleCrypto.