• CRC-64 polynomial-based checksums for data integrity. Supports ERTMS,
• ISO, XZ polynomials. O(n) computation over data buffer.

Initialization

• sapi_checksum_init(polynomial) - Initialize lookup tables
• Call once at startup before using CRC functions.

Computation

• sapi_checksum_crc64(data, length) - Compute CRC-64
• Returns 64-bit checksum for data integrity verification.

O(n) Per Buffer

• Time proportional to data length. One lookup table per polynomial.

MISRA Compliant

• ✓ No dynamic allocation
• ✓ Bounded computation
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