Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / Cryptography / RSAPKCS1KeyExchangeDeformatter.cs / 1 / RSAPKCS1KeyExchangeDeformatter.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== namespace System.Security.Cryptography { [System.Runtime.InteropServices.ComVisible(true)] public class RSAPKCS1KeyExchangeDeformatter : AsymmetricKeyExchangeDeformatter { RSA _rsaKey; RandomNumberGenerator RngValue; // Constructors public RSAPKCS1KeyExchangeDeformatter() {} public RSAPKCS1KeyExchangeDeformatter(AsymmetricAlgorithm key) { if (key == null) throw new ArgumentNullException("key"); _rsaKey = (RSA) key; } // // public properties // public RandomNumberGenerator RNG { get { return RngValue; } set { RngValue = value; } } public override String Parameters { get { return null; } set { ;} } // // public methods // public override byte[] DecryptKeyExchange(byte[] rgbIn) { if (_rsaKey == null) throw new CryptographicUnexpectedOperationException(Environment.GetResourceString("Cryptography_MissingKey")); byte[] rgbOut; if (_rsaKey is RSACryptoServiceProvider) { rgbOut = ((RSACryptoServiceProvider) _rsaKey).Decrypt(rgbIn, false); } else { int i; byte[] rgb; rgb = _rsaKey.DecryptValue(rgbIn); // // Expected format is: // 00 || 02 || PS || 00 || D // where PS does not contain any zeros. // for (i = 2; i= rgb.Length) throw new CryptographicUnexpectedOperationException(Environment.GetResourceString("Cryptography_PKCS1Decoding")); i++; // Skip over the zero rgbOut = new byte[rgb.Length - i]; Buffer.InternalBlockCopy(rgb, i, rgbOut, 0, rgbOut.Length); } return rgbOut; } public override void SetKey(AsymmetricAlgorithm key) { if (key == null) throw new ArgumentNullException("key"); _rsaKey = (RSA) key; } } }
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