Table of Contents

Adler64 Class

Definition

Namespace
Bodu.IO.Hashing.Checksums
Assembly
Bodu.IO.Hashing.dll
Package
Bodu.IO.Hashing 1.0.0
Source
Adler.Adler64.cs

Computes a 64-bit Adler-style checksum using the prime modulus 4294967291. This class cannot be inherited.

public sealed class Adler64 : Adler64Base, IResumableHashAlgorithm
Inheritance
Adler64
Implements
Inherited Members
Extension Methods

Remarks

Adler-64 extends the Adler-32 construction into the 64-bit domain. It maintains two 64-bit running sums (A and B) and combines them as (B << 32) | A. The modulus 4294967291 (the largest prime less than 232 ) reduces overflow pressure and improves checksum stability over large inputs compared to Adler-32.

Parameters at a glance.

  • Output size: 64 bits (8 bytes).
  • Modulus: 4294967291 (largest prime < 232).
  • Compatibility: not a standardized wire format - consumers must agree on Adler-64 explicitly.

When to choose Adler64. Pick Adler64 when 32 bits are not enough - very large datasets where the Adler-32 collision floor becomes a concern, multi-gigabyte block-storage checksums, or high-throughput logging pipelines. For interoperability with deflate / gzip / PNG use Adler32; for stronger error detection at 64 bits prefer Crc with CRC64_XZ.

important

This algorithm is not cryptographically secure and should not be used for password hashing, digital signatures, or integrity validation in security-sensitive applications.

using Bodu.IO.Hashing.Checksums;
using Bodu.IO.Hashing.Extensions;

var adler = new Adler64();
byte[] checksum = adler.ComputeHash(largePayload);

Constructors

Adler64()

Initializes a new instance of the Adler64 class using the Adler-64 prime modulus (4294967291).

public Adler64()

Applies to

ProductVersions
.NET8, 10

See Also

Adler<T>
Adler32
Adler32C