Hawkynt

SEED Key Wrap with Padding

RFC 5649 key wrapping with padding applied to SEED cipher. Supports arbitrary-length plaintext by padding to 8-byte multiples and embedding length in AIV.

Properties

Property	Value
Category	Special Algorithms
Sub-category	Key Wrapping
Security status	🛡️ Secure
Complexity	Intermediate
Inventor	NIST (RFC 5649 specification with SEED cipher)
Year	2009
Origin	🇰🇷 South Korea
Source	algorithms/crypto/seedwrappad.js

Parameters

Parameter	Supported values
Key sizes	16 bytes (128 bits)

Security

Status: 🛡️ Secure

No vulnerabilities are recorded for this implementation.

Documentation

• RFC 5649 - Advanced Encryption Standard (AES) Key Wrap with Padding Algorithm
• NIST SP 800-38F - Recommendation for Block Cipher Modes of Operation: Methods for Key Wrapping
• RFC 4269 - The SEED Encryption Algorithm

References

• BouncyCastle Rfc5649WrapEngine
• BouncyCastle SEEDEngine

Test vectors

2 vectors ship with this algorithm and run in the test suite. Byte values are hexadecimal.

Vector 1 — Self-consistency vector (RFC 5649 wrap structure, sized like RFC 5649 §6.2, with SEED substituted for AES; no official SEED-KWP KAT exists) — single-block case (7-octet key data)

Field	Value
key	000102030405060708090a0b0c0d0e0f
input	466f7250617369
expected	47e20ac2284005f3dbdf0b2ee509a460

Vector 2 — Self-consistency vector (RFC 5649 wrap structure, sized like RFC 5649 §6.1, with SEED substituted for AES; no official SEED-KWP KAT exists) — multi-block case (20-octet key data, general RFC 3394 loop)

Field	Value
key	2b7e151628aed2a6abf7158809cf4f3c
input	c37b7e6492584340bed12207808941155068f738
expected	938241514e0bf5f5ead58fe8eb09a93fa101fefc47e2f90de121a3765644226a

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