Professional extended Rijndael/AES with 256/512/1024-bit keys from CEX Cryptographic Library. Enhanced security margins with increased rounds (22/30/38) and HKDF-based key expansion.
| Property | Value |
|---|---|
| Category | Block Ciphers |
| Sub-category | Extended Block Cipher |
| Security status | 🎓 Educational Only |
| Complexity | Expert |
| Inventor | John Underhill (CEX) |
| Year | 2018 |
| Origin | 🇨🇦 Canada |
| Source | algorithms/block/rhx.js |
| Parameter | Supported values |
|---|---|
| Key sizes | 32 bytes (256 bits); 64 bytes (512 bits); 128 bytes (1024 bits) |
| Block sizes | 16 bytes (128 bits) |
Status: 🎓 Educational Only
| Issue | Description | Mitigation |
|---|---|---|
| Extended Cipher Analysis | Extended versions of standard ciphers may have different security properties | Use only for educational purposes and research into extended cipher designs |
3 vectors ship with this algorithm and run in the test suite. Byte values are hexadecimal.
Vector 1 — RHX-256 ECB Test Vector #1
| Field | Value |
|---|---|
key |
000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f |
input |
00112233445566778899aabbccddeeff |
expected |
434d237c44f64a17e6d4bbd510d0fdbf |
Vector 2 — RHX-512 ECB Test Vector #1
| Field | Value |
|---|---|
key |
000102030405060708090a0b0c0d0e0f 101112131415161718191a1b1c1d1e1f 202122232425262728292a2b2c2d2e2f 303132333435363738393a3b3c3d3e3f |
input |
6bc1bee22e409f96e93d7e117393172a |
expected |
3a906880382ab4b3e90b1aa6a1927b9f |
Vector 3 — RHX-1024 ECB Test Vector #1
| Field | Value |
|---|---|
key |
374a5d708396a9bccfe2f5081b2e4154 677a8da0b3c6d9ecff1225384b5e7184 97aabdd0e3f6091c2f4255687b8ea1b4 c7daed001326394c5f728598abbed1e4 f70a1d304356697c8fa2b5c8dbee0114 273a4d60738699acbfd2e5f80b1e3144 576a7d90a3b6c9dcef0215283b4e6174 879aadc0d3e6f90c1f3245586b7e91a4 |
input |
fedcba98765432100123456789abcdef |
expected |
2e339ff7e921e8ad3c9d9830606d8f1e |