Class SignatureHashAlgorithms

Hashing algorithms available for the PKCS#7/CMS signature digest (the "Hash Algorithm" Adobe Reader shows under Signature Details). SHA-256 is the modern default; SHA-1 remains selectable only for compatibility with legacy validators and is cryptographically weak.

Inheritance
System.Object
SignatureHashAlgorithms
Namespace: IronPdf.Signing
Assembly: IronPdf.dll
Syntax
public sealed class SignatureHashAlgorithms : Enum

SignatureHashAlgorithms controls the digest algorithm recorded in the PKCS#7/CMS signature block, visible in Adobe Reader under Signature Details. SHA256 is the modern default and the right choice for new documents. SHA384 and SHA512 provide stronger digests for high-assurance workflows. SHA1 is available only for compatibility with legacy validators and is cryptographically weak. See the PDF digital signing guide for usage context.

signature.HashAlgorithm = SignatureHashAlgorithms.SHA256;

Fields

SHA1

SHA-1 algorithm (legacy, cryptographically weak. Avoid for new signatures)

Declaration
public const SignatureHashAlgorithms SHA1
Field Value
Type Description
SignatureHashAlgorithms

SHA256

SHA-256 algorithm (default, recommended)

Declaration
public const SignatureHashAlgorithms SHA256
Field Value
Type Description
SignatureHashAlgorithms

SHA384

SHA-384 algorithm

Declaration
public const SignatureHashAlgorithms SHA384
Field Value
Type Description
SignatureHashAlgorithms

SHA512

SHA-512 algorithm

Declaration
public const SignatureHashAlgorithms SHA512
Field Value
Type Description
SignatureHashAlgorithms

value__

Declaration
public int value__
Field Value
Type Description
System.Int32

Extension Methods