feat: add PRESENT and Twofish ciphers

[thomasxm]

Summary

Adds two new block cipher implementations to CyberChef:

1. PRESENT - ISO/IEC 29192-2:2019 ultra-lightweight block cipher
2. Twofish - AES finalist by Bruce Schneier et al.

New Operations

PRESENT (ISO/IEC 29192-2:2019)

• PRESENT Encrypt - 64-bit block encryption with 80/128-bit keys
• PRESENT Decrypt - 64-bit block decryption with 80/128-bit keys
• Modes: ECB, CBC
• 31 rounds, SP-network structure

Twofish (AES Finalist)

• Twofish Encrypt - 128-bit block encryption with 128/192/256-bit keys
• Twofish Decrypt - 128-bit block decryption with 128/192/256-bit keys
• Modes: ECB, CBC, CFB, OFB, CTR
• 16 rounds, Feistel network structure

Padding Options (Both Ciphers)

• PKCS5 (PKCS#7)
• NO (none - requires block-aligned input)
• ZERO
• RANDOM
• BIT (ISO/IEC 7816-4)

Use Cases

• PRESENT: RFID tags, sensor networks, IoT devices, constrained environments
• Twofish: General-purpose encryption, legacy system compatibility, AES alternative

Files Changed

File	Action
src/core/lib/Present.mjs	NEW
src/core/lib/Twofish.mjs	NEW
src/core/operations/PRESENTEncrypt.mjs	NEW
src/core/operations/PRESENTDecrypt.mjs	NEW
src/core/operations/TwofishEncrypt.mjs	NEW
src/core/operations/TwofishDecrypt.mjs	NEW
src/core/config/Categories.json	Added all operations
tests/operations/tests/PRESENT.mjs	NEW
tests/operations/tests/Twofish.mjs	NEW
tests/operations/index.mjs	Registered tests

Testing

• All 1760 tests pass
• Official CHES 2007 test vectors for PRESENT (Table 3)
• Official Schneier test vectors for Twofish

PRESENT Test Vectors (CHES 2007)

Key Size	Key	Plaintext	Ciphertext
80-bit	00000000000000000000	0000000000000000	5579c1387b228445
80-bit	ffffffffffffffffffff	0000000000000000	e72c46c0f5945049
128-bit	00000000000000000000000000000000	0000000000000000	96db702a2e6900af

Twofish Test Vectors (Schneier)

Key Size	Key	Plaintext	Ciphertext
128-bit	0000...0000 (32 hex)	0000...0000 (32 hex)	9f589f5cf6122c32b6bfec2f2ae8c35a
192-bit	0000...0000 (48 hex)	0000...0000 (32 hex)	efa71f788965bd4453f860178fc19101
256-bit	0000...0000 (64 hex)	0000...0000 (32 hex)	57ff739d4dc92c1bd7fc01700cc8216f

Implementation Notes

• Pure JavaScript implementations (no external dependencies)
• Uses BigInt for 64-bit and 128-bit operations
• Consistent API with existing CyberChef cipher operations (SM4, Blowfish, GOST)

References

• PRESENT: An Ultra-Lightweight Block Cipher (CHES 2007)
• ISO/IEC 29192-2:2019
• Twofish: A 128-Bit Block Cipher
• SageMath PRESENT Implementation