Crypto.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Security / Cryptography / Crypto.cs / 1 / Crypto.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 

// 
// Crypto.cs 
//
 
namespace System.Security.Cryptography {
    using Microsoft.Win32;
    using System.Runtime.Serialization;
    using System.Globalization; 

    // This enum represents cipher chaining modes: cipher block chaining (CBC), 
    // electronic code book (ECB), output feedback (OFB), cipher feedback (CFB), 
    // and ciphertext-stealing (CTS).  Not all implementations will support all modes.
    [Serializable] 
    [System.Runtime.InteropServices.ComVisible(true)]
    public enum CipherMode {            // Please keep in sync with wincrypt.h
        CBC = 1,
        ECB = 2, 
        OFB = 3,
        CFB = 4, 
        CTS = 5 
    }
 
    // This enum represents the padding method to use for filling out short blocks.
    // "None" means no padding (whole blocks required).
    // "PKCS7" is the padding mode defined in RFC 2898, Section 6.1.1, Step 4, generalized
    // to whatever block size is required. 
    // "Zeros" means pad with zero bytes to fill out the last block.
    // "ISO 10126" is the same as PKCS5 except that it fills the bytes before the last one with 
    // random bytes. "ANSI X.923" fills the bytes with zeros and puts the number of padding 
    // bytes in the last byte.
 
    [Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
    public enum PaddingMode {
        None = 1, 
        PKCS7 = 2,
        Zeros = 3, 
        ANSIX923 = 4, 
        ISO10126 = 5
    } 

    // This structure is used for returning the set of legal key sizes and
    // block sizes of the symmetric algorithms.
    // Note: this class should be sealed, otherwise someone could sub-class it and the read-only 
    // properties we depend on can have setters. Ideally, we should have a struct here (value type)
    // but we use what we have now and try to close the hole allowing someone to specify an invalid key size 
[System.Runtime.InteropServices.ComVisible(true)] 
    public sealed class KeySizes {
        private int m_minSize; 
        private int m_maxSize;
        private int m_skipSize;

        public int MinSize { 
            get { return m_minSize; }
        } 
 
        public int MaxSize {
            get { return m_maxSize; } 
        }

        public int SkipSize {
            get { return m_skipSize; } 
        }
 
        public KeySizes(int minSize, int maxSize, int skipSize) { 
            m_minSize = minSize; m_maxSize = maxSize; m_skipSize = skipSize;
        } 
    }

    [Serializable]
[System.Runtime.InteropServices.ComVisible(true)] 
    public class CryptographicException : SystemException {
        private const int FORMAT_MESSAGE_IGNORE_INSERTS = 0x00000200; 
        private const int FORMAT_MESSAGE_FROM_SYSTEM    = 0x00001000; 
        private const int FORMAT_MESSAGE_ARGUMENT_ARRAY = 0x00002000;
 
        public CryptographicException()
            : base(Environment.GetResourceString("Arg_CryptographyException")) {
            SetErrorCode(__HResults.CORSEC_E_CRYPTO);
        } 

        public CryptographicException(String message) 
            : base(message) { 
            SetErrorCode(__HResults.CORSEC_E_CRYPTO);
        } 

        public CryptographicException(String format, String insert)
            : base(String.Format(CultureInfo.CurrentCulture, format, insert)) {
            SetErrorCode(__HResults.CORSEC_E_CRYPTO); 
        }
 
        public CryptographicException(String message, Exception inner) 
            : base(message, inner) {
            SetErrorCode(__HResults.CORSEC_E_CRYPTO); 
        }

        public CryptographicException(int hr)
            : this(Win32Native.GetMessage(hr)) { 
            if ((hr & 0x80000000) != 0x80000000)
                hr = (hr & 0x0000FFFF) | unchecked((int)0x80070000); 
            SetErrorCode(hr); 
        }
 
        protected CryptographicException(SerializationInfo info, StreamingContext context) : base (info, context) {}

        // This method is only called from inside the VM.
        private static void ThrowCryptogaphicException (int hr) { 
            throw new CryptographicException(hr);
        } 
    } 

    [Serializable()] 
[System.Runtime.InteropServices.ComVisible(true)]
    public class CryptographicUnexpectedOperationException : CryptographicException {
        public CryptographicUnexpectedOperationException()
            : base() { 
            SetErrorCode(__HResults.CORSEC_E_CRYPTO_UNEX_OPER);
        } 
 
        public CryptographicUnexpectedOperationException(String message)
            : base(message) { 
            SetErrorCode(__HResults.CORSEC_E_CRYPTO_UNEX_OPER);
        }

        public CryptographicUnexpectedOperationException(String format, String insert) 
            : base(String.Format(CultureInfo.CurrentCulture, format, insert)) {
            SetErrorCode(__HResults.CORSEC_E_CRYPTO_UNEX_OPER); 
        } 

        public CryptographicUnexpectedOperationException(String message, Exception inner) 
            : base(message, inner) {
            SetErrorCode(__HResults.CORSEC_E_CRYPTO_UNEX_OPER);
        }
 
        protected CryptographicUnexpectedOperationException(SerializationInfo info, StreamingContext context) : base (info, context) {}
    } 
}

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