What is SHA-512/256 (FIPS 180-4)?
SHA-512/256 (FIPS 180-4) is a SHA-2 cryptographic hash function that outputs a 256-bit (32-byte) digest, typically rendered as a 64-character hexadecimal string. It is based on SHA-512 with different initial values and a truncated output, providing a shorter digest while keeping SHA-512’s internal structure.
Key characteristics:
- Deterministic: The same input always produces the same hash
- Fast computation: Quick to compute for any given input
- Avalanche effect: Small changes in input produce drastically different outputs
- Irreversible: Computationally infeasible to reverse the hash to find the original input
- Collision resistant: Very difficult to find two different inputs that produce the same hash
Common uses:
- Digital signatures and certificates
- Integrity checks and checksums
- HMAC constructions
- File verification and data pipelines
- Protocols that require 256-bit hashes