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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.security.cryptography.pkcs.signerinfo below:

SignerInfo Class (System.Security.Cryptography.Pkcs) | Microsoft Learn

The SignerInfo class represents a signer associated with a SignedCms object that represents a CMS/PKCS #7 message.

public ref class SignerInfo sealed

public sealed class SignerInfo

type SignerInfo = class

Public NotInheritable Class SignerInfo

Inheritance

The signatures represented by the SignerInfo class can be either over message content or a signature. The latter kind of signature is referred to as a countersignature.

This implementation of CMS/PKCS #7 supports only one level of countersignature. That is, a signature can be signed, which forms a countersignature, but that countersignature cannot be signed again.

This class does not have a public constructor; therefore, it cannot be publicly instantiated. It is a read-only class accessible from the SignedCms.SignerInfos property.

Adds the specified attribute to the current document.

The CheckHash() method verifies the data integrity of the CMS/PKCS #7 message signer information. CheckHash() is a specialized method used in specific security infrastructure applications in which the subject uses the HashOnly member of the SubjectIdentifierType enumeration when setting up a CmsSigner object. CheckHash() does not authenticate the signer information because this method does not involve verifying a digital signature. For general-purpose checking of the integrity and authenticity of CMS/PKCS #7 message signer information and countersignatures, use the CheckSignature(Boolean) or CheckSignature(X509Certificate2Collection, Boolean) methods.

The CheckSignature(Boolean) method verifies the digital signature of the message and, optionally, validates the certificate.

The CheckSignature(X509Certificate2Collection, Boolean) method verifies the digital signature of the message by using the specified collection of certificates and, optionally, validates the certificate.

Obsolete.

The ComputeCounterSignature() method prompts the user to select a signing certificate, creates a countersignature, and adds the signature to the CMS/PKCS #7 message. Countersignatures are restricted to one level.

The ComputeCounterSignature(CmsSigner) method creates a countersignature by using the specified signer and adds the signature to the CMS/PKCS #7 message. Countersignatures are restricted to one level.

Determines whether the specified object is equal to the current object.

Serves as the default hash function.

Retrieves the signature for the current SignerInfo object.

Gets the Type of the current instance.

Creates a shallow copy of the current Object.

The RemoveCounterSignature(Int32) method removes the countersignature at the specified index of the CounterSignerInfos collection.

The RemoveCounterSignature(SignerInfo) method removes the countersignature for the specified SignerInfo object.

Removes the specified attribute from the current document.

Returns a string that represents the current object.

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