AsymmetricAlgorithmSignature Public class
Description
This class allows you to sign with either an RSACryptoServiceProvider/DSACryptoServiceProvider from a X509Certificate2, or from manually created RSACryptoServiceProvider/DSACryptoServiceProvider. Depending on the certificate's CSP, sometimes you will not be able to sign with SHA-256/SHA-512 hash algorithm with RSACryptoServiceProvider taken directly from the certificate. This class allows you to use a workaround in this case and sign with certificate's private key and SHA-256/SHA-512 anyway.
An example of a workaround for CSP that does not support SHA-256/SHA-512: ...
Diagram
flowchart LR classDef interfaceStyle stroke-dasharray: 5 5; classDef abstractStyle stroke-width:4px subgraph iTextSharp.text.pdf.security iTextSharp.text.pdf.security.AsymmetricAlgorithmSignature[[AsymmetricAlgorithmSignature]] iTextSharp.text.pdf.security.IExternalSignature[[IExternalSignature]] class iTextSharp.text.pdf.security.IExternalSignature interfaceStyle; end iTextSharp.text.pdf.security.IExternalSignature --> iTextSharp.text.pdf.security.AsymmetricAlgorithmSignature
Members
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Details
Summary
This class allows you to sign with either an RSACryptoServiceProvider/DSACryptoServiceProvider from a X509Certificate2, or from manually created RSACryptoServiceProvider/DSACryptoServiceProvider. Depending on the certificate's CSP, sometimes you will not be able to sign with SHA-256/SHA-512 hash algorithm with RSACryptoServiceProvider taken directly from the certificate. This class allows you to use a workaround in this case and sign with certificate's private key and SHA-256/SHA-512 anyway.
An example of a workaround for CSP that does not support SHA-256/SHA-512:
if (certificate.PrivateKey is RSACryptoServiceProvider) { RSACryptoServiceProvider rsa = (RSACryptoServiceProvider)certificate.PrivateKey; // Modified by J. Arturo // Workaround for SHA-256 and SHA-512 if (rsa.CspKeyContainerInfo.ProviderName == "Microsoft Strong Cryptographic Provider" || rsa.CspKeyContainerInfo.ProviderName == "Microsoft Enhanced Cryptographic Provider v1.0" || rsa.CspKeyContainerInfo.ProviderName == "Microsoft Base Cryptographic Provider v1.0") { string providerName = "Microsoft Enhanced RSA and AES Cryptographic Provider"; int providerType = 24; Type CspKeyContainerInfo_Type = typeof(CspKeyContainerInfo); FieldInfo CspKeyContainerInfo_m_parameters = CspKeyContainerInfo_Type.GetField("m_parameters", BindingFlags.NonPublic | BindingFlags.Instance); CspParameters parameters = (CspParameters)CspKeyContainerInfo_m_parameters.GetValue(rsa.CspKeyContainerInfo); var cspparams = new CspParameters(providerType, providerName, rsa.CspKeyContainerInfo.KeyContainerName); cspparams.Flags = parameters.Flags; using (var rsaKey = new RSACryptoServiceProvider(cspparams)) { // use rsaKey now } } else { // Use rsa directly } }
Inheritance
Constructors
AsymmetricAlgorithmSignature [1/2]
Source code
public AsymmetricAlgorithmSignature(RSACryptoServiceProvider algorithm, string hashAlgorithm)
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hashAlgorithm |
AsymmetricAlgorithmSignature [2/2]
Source code
public AsymmetricAlgorithmSignature(DSACryptoServiceProvider algorithm)
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Methods
Sign
Source code
public virtual byte Sign(byte[] message)
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GetHashAlgorithm
Source code
public virtual string GetHashAlgorithm()
GetEncryptionAlgorithm
Source code
public virtual string GetEncryptionAlgorithm()
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