Hawkynt

SOBER-128

Word-based stream cipher with 17-stage LFSR and non-linear filter, designed by Greg Rose of QUALCOMM. Features key-dependent KONST generation and stuttering mechanism.

Properties

Property	Value
Category	Stream Ciphers
Sub-category	Stream Cipher
Security status	🎓 Educational Only
Complexity	Intermediate
Inventor	Greg Rose (QUALCOMM)
Year	1998
Origin	🇦🇺 Australia
Source	`algorithms/stream/sober128.js`

Parameters

Parameter	Supported values
Key sizes	4 bytes (32 bits) to 256 bytes (2048 bits) in steps of 4 bytes
Nonce sizes	4 bytes (32 bits) to 256 bytes (2048 bits) in steps of 4 bytes

Security

Status: 🎓 Educational Only

No vulnerabilities are recorded for this implementation.

Documentation

References

LibTomCrypt Reference Implementation (based on Qualcomm’s s128fast.c)

Test vectors

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

Vector 1 — LibTomCrypt Test Vector - 128-bit key, 4-byte IV

Field	Value
`key`	`74657374206b65792031323862697473`
`iv`	`00000000`
`input`	`0000000000000000000000000000000000000000`
`expected`	`43500ccf89919f1daa377495f4b458c240378bbb`

Vector 2 — DarkCrypt keystream, incremental key

Field	Value
`key`	`000102030405060708090a0b0c0d0e0f`
`iv`	`00000000000000000000000000000000`
`input`	`00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000 00000000000000000000000000000000`
`expected`	`f0348280f75f4051b97a4ba5c6535204 a344e639110df57ff515c3af11776f87 e9fc8e9a661ef4e9272c0e71d891b997 ba63ba2392a1da420a336f54733e0197 c280386ee9b035c9d78ca0c1884025e9 649047b791d74de0557abefabd7eaf1c 722acf3bc83600023531bee7aa750779 f4405a3b9ab14ed2e732d71a476a729f`

Vector 3 — DarkCrypt incremental plaintext, incremental key

Field	Value
`key`	`000102030405060708090a0b0c0d0e0f`
`iv`	`00000000000000000000000000000000`
`input`	`000102030405060708090a0b0c0d0e0f 101112131415161718191a1b1c1d1e1f 202122232425262728292a2b2c2d2e2f 303132333435363738393a3b3c3d3e3f`
`expected`	`f0358083f35a4656b17341aeca5e5c0b b355f42a0518e368ed0cd9b40d6a7198 c9ddacb9423bd2ce0f05245af4bc97b8 8a528810a694ec75320a556f4f033fa8`

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