Hawkynt

Blowfish

Bruce Schneier’s Blowfish cipher with 64-bit blocks and variable key lengths from 32 to 448 bits. Uses key-dependent S-boxes and 16-round Feistel network.

Properties

Property	Value
Category	Block Ciphers
Sub-category	Block Cipher
Security status	🎓 Educational Only
Complexity	Intermediate
Inventor	Bruce Schneier
Year	1993
Origin	🇺🇸 United States
Source	algorithms/block/blowfish.js

Parameters

Parameter	Supported values
Key sizes	4 bytes (32 bits) to 56 bytes (448 bits)
Block sizes	8 bytes (64 bits)

Security

Status: 🎓 Educational Only

No vulnerabilities are recorded for this implementation.

Documentation

• Applied Cryptography - Blowfish
• Official Blowfish Description
• Blowfish Test Vectors

References

• OpenSSL Blowfish Implementation
• libgcrypt Blowfish Implementation
• Crypto++ Blowfish Implementation

Test vectors

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

Vector 1 — DarkCrypt Blowfish-448 vector 1/zero

Field	Value
key	00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 0000000000000000
input	0000000000000000
expected	4ef997456198dd78

Vector 2 — DarkCrypt Blowfish-448 vector 2/incr

Field	Value
key	000102030405060708090a0b0c0d0e0f 101112131415161718191a1b1c1d1e1f 202122232425262728292a2b2c2d2e2f 3031323334353637
input	0001020304050607
expected	373c66bba50eb9cc

Vector 3 — DarkCrypt Blowfish-448 vector 3/incr2

Field	Value
key	0102030405060708090a0b0c0d0e0f10 1112131415161718191a1b1c1d1e1f20 2122232425262728292a2b2c2d2e2f30 3132333435363738
input	1011121314151617
expected	c8ab0874262536bd

Vector 4 — Blowfish Official Test Vector #1 - All Zeros

Field	Value
key	0000000000000000
input	0000000000000000
expected	4ef997456198dd78

Vector 5 — Blowfish Official Test Vector #2 - All Ones

Field	Value
key	ffffffffffffffff
input	ffffffffffffffff
expected	51866fd5b85ecb8a

Vector 6 — Blowfish Official Test Vector #3 - Pattern Data

Field	Value
key	0123456789abcdef
input	1111111111111111
expected	61f9c3802281b096

Vector 7 — Blowfish ASCII Test Vector

Field	Value
key	544553544b455921
input	424c4f5746495348
expected	2532fa57d3acf5c5

Vector 8 — Blowfish Single Bit Test

Field	Value
key	8000000000000000
input	8000000000000000
expected	6e6456626849cf27

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