BSD Unix checksum algorithm using rotating 16-bit sum. Rotates checksum right by 1 bit before adding each byte. Used by BSD ‘sum’ command for file integrity verification.
| Property | Value |
|---|---|
| Category | Checksums |
| Sub-category | Rotating Sum |
| Security status | 🎓 Educational Only |
| Complexity | Beginner |
| Inventor | BSD Unix developers |
| Year | 1977 |
| Origin | 🇺🇸 United States |
| Source | algorithms/checksum/bsd-checksum.js |
Status: 🎓 Educational Only
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 — Single character
Source: BSD checksum calculation
| Field | Value |
|---|---|
input |
61 |
expected |
0061 |
Vector 2 — Three characters
Source: BSD checksum with rotation
| Field | Value |
|---|---|
input |
616263 |
expected |
40ac |
Vector 3 — Maximum bytes
Source: BSD checksum overflow handling
| Field | Value |
|---|---|
input |
ffff |
expected |
817e |