CRYPTO#Hash
SHA-1/256/512 · HMAC w/ key
Computed locally via Web Crypto (SubtleCrypto), nothing uploaded. MD5 uses a local implementation (for compatibility, not cryptographically secure).
Hash: SHA-1/256/512 + HMAC with Key
Typical scenarios: ① verify file integrity after download by comparing against the official hash; ② generate a signed value with a key for API verification; ③ fingerprint large files for comparison.
How to use: paste text or upload a file, pick an algorithm (e.g. SHA-256), enter a key if needed, and click Calculate to get the result.
Notes: ① hashing is one-way — the original content cannot be recovered from the result; ② never store passwords as a plain hash; combine salting with a dedicated algorithm; ③ identical hashes mean identical content, different hashes mean a change; ④ for very large files, a command-line tool is smoother.
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