# 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: Java
- Version: APDFL21.0.0PlusP1f
- HTML page: https://docs.datalogics.com/apdfl21/Java/APDFL21.0.0PlusP1f/enum/DigestCategory
- Version index: https://docs.datalogics.com/apdfl21/Java/APDFL21.0.0PlusP1f/llms.txt

**Namespace:** `com::datalogics::PDFL`

## Description

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

## Values

- `SHA_1`: SHA-1 message digest comprised of a 160-bit hash value.
- `SHA_224`: SHA-2 message digest comprised of a 224-bit hash value.
- `SHA_256`: SHA-2 message digest comprised of a 256-bit hash value.
- `SHA_384`: SHA-2 message digest comprised of a 384-bit hash value.
- `SHA_512`: SHA-2 message digest comprised of a 512-bit hash value.