# DigestCategory Enum

> Enumeration to specify cryptographic hash functions that generate variable-length message digests required for digital signature creation.

- Product: Adobe PDF Library 21
- Language: .NET Framework
- Version: APDFL21.0.0PlusP1e
- HTML page: https://docs.datalogics.com/apdfl21/DotNetFramework/APDFL21.0.0PlusP1e/enum/DigestCategory
- Version index: https://docs.datalogics.com/apdfl21/DotNetFramework/APDFL21.0.0PlusP1e/llms.txt

**Namespace:** `Datalogics::PDFL`

## Description

Enumeration to specify cryptographic hash functions that generate variable-length message digests required for digital signature creation.

## Values

- `Sha1 = 0`: SHA-1 message digest comprised of a 160-bit hash value.
- `Sha224 = 1`: SHA-2 message digest comprised of a 224-bit hash value.
- `Sha256 = 2`: SHA-2 message digest comprised of a 256-bit hash value.
- `Sha384 = 3`: SHA-2 message digest comprised of a 384-bit hash value.
- `Sha512 = 4`: SHA-2 message digest comprised of a 512-bit hash value.