Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / Cryptography / RSAPKCS1SignatureDeformatter.cs / 1 / RSAPKCS1SignatureDeformatter.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== // // RSAPKCS1SignatureDeformatter.cs // namespace System.Security.Cryptography { [System.Runtime.InteropServices.ComVisible(true)] public class RSAPKCS1SignatureDeformatter : AsymmetricSignatureDeformatter { // // This class provides the PKCS#1 v1.5 signature format processing during // the verification process (i.e. decrypting the object). The class has // some special code for dealing with the CSP based RSA keys as the // formatting and verification is done within the CSP rather than in // managed code. // private RSA _rsaKey; // RSA Key value to do decrypt operation private String _strOID; // OID value for the HASH algorithm // // public constructors // public RSAPKCS1SignatureDeformatter() {} public RSAPKCS1SignatureDeformatter(AsymmetricAlgorithm key) { if (key == null) throw new ArgumentNullException("key"); _rsaKey = (RSA) key; } // // public methods // public override void SetKey(AsymmetricAlgorithm key) { if (key == null) throw new ArgumentNullException("key"); _rsaKey = (RSA) key; } public override void SetHashAlgorithm(String strName) { _strOID = CryptoConfig.MapNameToOID(strName); } public override bool VerifySignature(byte[] rgbHash, byte[] rgbSignature) { if (_strOID == null) throw new CryptographicUnexpectedOperationException(Environment.GetResourceString("Cryptography_MissingOID")); if (_rsaKey == null) throw new CryptographicUnexpectedOperationException(Environment.GetResourceString("Cryptography_MissingKey")); if (rgbHash == null) throw new ArgumentNullException("rgbHash"); if (rgbSignature == null) throw new ArgumentNullException("rgbSignature"); // Two cases here -- if we are talking to the CSP version or if we are talking to some other RSA provider. if (_rsaKey is RSACryptoServiceProvider) { return ((RSACryptoServiceProvider) _rsaKey).VerifyHash(rgbHash, _strOID, rgbSignature); } else { byte[] pad = Utils.RsaPkcs1Padding(_rsaKey, CryptoConfig.EncodeOID(_strOID), rgbHash); // Apply the public key to the signature data to get back the padded buffer actually signed. // Compare the two buffers to see if they match; ignoring any leading zeros return Utils.CompareBigIntArrays(_rsaKey.EncryptValue(rgbSignature), pad); } } } }
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