The class represents a signer associated with a SignedCms object that represents a CMS/PKCS #7 message.
Assembly: System.Security (in System.Security.dll)
Thetype exposes the following members.
|Certificate||The Certificate property retrieves the signing certificate associated with the signer information.|
|CounterSignerInfos||The CounterSignerInfos property retrieves the set of counter signers associated with the signer information.|
|DigestAlgorithm||The DigestAlgorithm property retrieves the Oid object that represents the hash algorithm used in the computation of the signatures.|
|SignedAttributes||The SignedAttributes property retrieves the CryptographicAttributeObjectCollection collection of signed attributes that is associated with the signer information. Signed attributes are signed along with the rest of the message content.|
|SignerIdentifier||The SignerIdentifier property retrieves the certificate identifier of the signer associated with the signer information.|
|UnsignedAttributes||The UnsignedAttributes property retrieves the CryptographicAttributeObjectCollection collection of unsigned attributes that is associated with the content. Unsigned attributes can be modified without invalidating the signature.|
|Version||The Version property retrieves the signer information version.|
|CheckHash||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.|
|CheckSignature(Boolean)||The CheckSignature(Boolean) method verifies the digital signature of the message and, optionally, validates the certificate.|
|CheckSignature(X509Certificate2Collection, Boolean)||The CheckSignature(X509Certificate2Collection, Boolean) method verifies the digital signature of the message by using the specified collection of certificates and, optionally, validates the certificate.|
|ComputeCounterSignature()||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.|
|ComputeCounterSignature(CmsSigner)||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.|
|Equals(Object)||Determines whether the specified Object is equal to the current Object. (Inherited from Object.)|
|Finalize||Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)|
|GetHashCode||Serves as a hash function for a particular type. (Inherited from Object.)|
|GetType||Gets the Type of the current instance. (Inherited from Object.)|
|MemberwiseClone||Creates a shallow copy of the current Object. (Inherited from Object.)|
|RemoveCounterSignature(Int32)||The RemoveCounterSignature method removes the countersignature at the specified index of the CounterSignerInfos collection.|
|RemoveCounterSignature(SignerInfo)||The RemoveCounterSignature method removes the countersignature for the specified object.|
|ToString||Returns a string that represents the current object. (Inherited from Object.)|
The signatures represented by the 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.
The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: MayLeakOnAbort. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.