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Function CRC32 Input: data: Bytes // Array of bytes Output: crc32: UInt32 // 32-bit unsigned CRC-32 value // Initialize CRC-32 to starting value crc32 ← 0xFFFFFFFF for each byte in data do nLookupIndex ← (crc32 xor byte) and 0xFF crc32 ← (crc32 shr 8) xor CRCTable[nLookupIndex] // CRCTable is an array of 256 32-bit constants
These inversions are extremely common but not universally performed, even in the case of the CRC-32 or CRC-16-CCITT polynomials. They are almost always included when sending variable-length messages, but often omitted when communicating fixed-length messages, as the problem of added zero bits is less likely to arise.
To compute an n-bit binary CRC, line the bits representing the input in a row, and position the (n + 1)-bit pattern representing the CRC's divisor (called a "polynomial") underneath the left end of the row. In this example, we shall encode 14 bits of message with a 3-bit CRC, with a polynomial x 3 + x + 1.
Fowler–Noll–Vo hash function (FNV Hash) 32, 64, 128, 256, 512, or 1024 bits xor/product or product/XOR Jenkins hash function: 32 or 64 bits XOR/addition Bernstein's hash djb2 [2] 32 or 64 bits shift/add or mult/add or shift/add/xor or mult/xor PJW hash / Elf Hash: 32 or 64 bits add,shift,xor MurmurHash: 32, 64, or 128 bits product/rotation ...
CRC (numeric: 188) Subunit: 0.01: Unit; Plural: colones: Symbol ₡ Denominations; Subunit 1 ⁄ 100: céntimo (out of circulation) Banknotes Freq. used ₡1 000, ₡2 000, ₡5 000, ₡10 000, ₡20 000 Rarely used ₡50 000 (Withdrawn, still exchangeable at Banco de Costa Rica) Coins Freq. used ₡10, ₡25, ₡50, ₡100, ₡500 Rarely used
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CRC Handbook of Chemistry and Physics, a science reference handbook published by CRC Press; CRC Standard Mathematical Tables, a mathematics reference handbook published by CRC Press; Cyclic redundancy check, a type of hash function used to produce a checksum in order to detect errors in data storage or transmission
the Costa Rican colón (CRC), used in Costa Rica since 1896 the Salvadoran colón (SVC), used in El Salvador from 1892 until 2001, when it was replaced by the American dollar Symbol