Variable symmetric block cipher with data-dependent rotations. Features configurable word size, rounds, and key length. This implementation uses RC5-32/12/16 (32-bit words, 12 rounds, up to 255-byte key).
| Property | Value |
|---|---|
| Category | Block Ciphers |
| Sub-category | Block Cipher |
| Security status | Not classified |
| Complexity | Intermediate |
| Inventor | Ronald Rivest |
| Year | 1994 |
| Origin | 🇺🇸 United States |
| Source | algorithms/block/rc.js |
| Parameter | Supported values |
|---|---|
| Key sizes | 0 bytes (0 bits) to 255 bytes (2040 bits) |
| Block sizes | 8 bytes (64 bits) |
Status: not classified — treat as unverified.
No vulnerabilities are recorded for this implementation.
3 vectors ship with this algorithm and run in the test suite. Byte values are hexadecimal.
Vector 1 — RC5-32/12/16 zero key, zero plaintext
| Field | Value |
|---|---|
key |
00000000000000000000000000000000 |
input |
0000000000000000 |
expected |
21a5dbee154b8f6d |
Vector 2 — RC5-32/12/16 pattern key and plaintext
| Field | Value |
|---|---|
key |
0102030405060708090a0b0c0d0e0f10 |
input |
0123456789abcdef |
expected |
b734213608254d2f |
Vector 3 — RC5-32/12/16 all ones key and plaintext
| Field | Value |
|---|---|
key |
ffffffffffffffffffffffffffffffff |
input |
ffffffffffffffff |
expected |
778769e9be0167b7 |