node crypto ai_generated true

Error: Invalid IV length

ID: node/err-crypto-invalid-iv-length

Also available as: JSON · Markdown
95%Fix Rate
96%Confidence
50Evidence
2023-01-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
20 active — — —

Root Cause

Initialization vector (IV) length doesn't match what the cipher expects (usually 16 bytes for AES).

generic

Workarounds

  1. 96% success Generate a random IV of the correct length: crypto.randomBytes(16) for AES-128/256 
    Store the IV alongside the ciphertext for decryption

    Sources: https://nodejs.org/api/crypto.html#cryptorandombytessize-callback

  2. 88% success Check the cipher algorithm — different ciphers require different IV lengths 
    AES-CBC/CTR needs 16 bytes; ChaCha20 needs 12 bytes

Dead Ends

Common approaches that don't work:

  1. Padding the IV with zeros 80% fail

    Weakens cryptographic security; predictable IV bytes

  2. Using a fixed/hardcoded IV 90% fail

    Completely defeats the purpose of an IV; same plaintext → same ciphertext

Error Chain

Frequently confused with: