SignedCms.CheckSignature Method (X509Certificate2Collection, Boolean)
Themethod verifies the digital signatures on the signed CMS/PKCS #7 message by using the specified collection of certificates and, optionally, validates the signers' certificates.
Assembly: System.Security (in System.Security.dll)
public void CheckSignature( X509Certificate2Collection extraStore, bool verifySignatureOnly )
An X509Certificate2Collection object that can be used to validate the certificate chain. If no additional certificates are to be used to validate the certificate chain, use CheckSignature(Boolean) instead of .
A Boolean value that specifies whether only the digital signatures are verified without the signers' certificates being validated.
If verifySignatureOnly is true, only the digital signatures are verified. If it is false, the digital signatures are verified, the signers' certificates are validated, and the purposes of the certificates are validated. The purposes of a certificate are considered valid if the certificate has no key usage or if the key usage supports digital signatures or nonrepudiation.
This method verifies all signatures, including countersignatures, on the CMS/PKCS #7 message. If there are signed attributes included with the message, these attributes are also verified. If the option is chosen to validate certificates, the entire included portion of the certificate chain is validated.
This method throws an exception if the verification of a digital signature fails or any validation requirements are not met.
// Create a new, nondetached SignedCms message. SignedCms signedCms = new SignedCms(); // encodedMessage is the encoded message received from // the sender. signedCms.Decode(encodedMessage); // Verify the signature without validating the // certificate. signedCms.CheckSignature(true);
// Create a ContentInfo object from the inner content obtained // independently from encodedMessage. ContentInfo contentInfo = new ContentInfo(innerContent); // Create a new, detached SignedCms message. SignedCms signedCms = new SignedCms(contentInfo, true); // encodedMessage is the encoded message received from // the sender. signedCms.Decode(encodedMessage); // Verify the signature without validating the // certificate. signedCms.CheckSignature(true);
Available since 2.0