CryptographicBuffer的使用技巧

1.創建隨機數

public string GenerateRandomData()
{
    // Define the length, in bytes, of the buffer.
    uint length = 32;

    // Generate random data and copy it to a buffer.
    IBuffer buffer = CryptographicBuffer.GenerateRandom(length);

    // Encode the buffer to a hexadecimal string (for display).
    string randomHex = CryptographicBuffer.EncodeToHexString(buffer);

    return public void CompareBuffers()
{
    // Create a hexadecimal string.
    String strHex = "30310aff";

    // Create a Base64 string that is equivalent to strHex.
    String strBase64v1 = "MDEK/w==";

    // Create a Base64 string that is not equivalent to strHex.
    String strBase64v2 = "KEDM/w==";

    // Decode strHex to a buffer.
    IBuffer buff1 = CryptographicBuffer.DecodeFromHexString(strHex);

    // Decode strBase64v1 to a buffer.
    IBuffer buff2 = CryptographicBuffer.DecodeFromBase64String(strBase64v1);

    // Decode strBase64v2 to a buffer.
    IBuffer buff3 = CryptographicBuffer.DecodeFromBase64String(strBase64v2);

    // Compare the hexadecimal-decoded buff1 to the Base64-decoded buff2.
    // The code points in the two buffers are equal, and the Boolean value
    // is true.
    Boolean bVal_1 = CryptographicBuffer.Compare(buff1, buff2);

    // Compare the hexadecimal-decoded buff1 to the Base64-decoded buff3.
    // The code points in the two buffers are not equal, and the Boolean value
    // is false.
    Boolean bVal_2 = CryptographicBuffer.Compare(buff1, buff3);
};
}

public uint GenerateRandomNumber()
{
    // Generate a random number.
    uint random = CryptographicBuffer.GenerateRandomNumber();
    return random;
}

2.比較緩存

public void CompareBuffers()
{
    // Create a hexadecimal string.
    String strHex = "30310aff";

    // Create a Base64 string that is equivalent to strHex.
    String strBase64v1 = "MDEK/w==";

    // Create a Base64 string that is not equivalent to strHex.
    String strBase64v2 = "KEDM/w==";

    // Decode strHex to a buffer.
    IBuffer buff1 = CryptographicBuffer.DecodeFromHexString(strHex);

    // Decode strBase64v1 to a buffer.
    IBuffer buff2 = CryptographicBuffer.DecodeFromBase64String(strBase64v1);

    // Decode strBase64v2 to a buffer.
    IBuffer buff3 = CryptographicBuffer.DecodeFromBase64String(strBase64v2);

    // Compare the hexadecimal-decoded buff1 to the Base64-decoded buff2.
    // The code points in the two buffers are equal, and the Boolean value
    // is true.
    Boolean bVal_1 = CryptographicBuffer.Compare(buff1, buff2);

    // Compare the hexadecimal-decoded buff1 to the Base64-decoded buff3.
    // The code points in the two buffers are not equal, and the Boolean value
    // is false.
    Boolean bVal_2 = CryptographicBuffer.Compare(buff1, buff3);
}

3.strings 和 binary轉換

public void ConvertData()
{
    // Create a string to convert.
    String strIn = "Input String";

    // Convert the string to UTF16BE binary data.
    IBuffer buffUTF16BE = CryptographicBuffer.ConvertStringToBinary(strIn, BinaryStringEncoding.Utf16BE);

    // Convert the string to UTF16LE binary data.
    IBuffer buffUTF16LE = CryptographicBuffer.ConvertStringToBinary(strIn, BinaryStringEncoding.Utf16LE);

    // Convert the string to UTF8 binary data.
    IBuffer buffUTF8 = CryptographicBuffer.ConvertStringToBinary(strIn, BinaryStringEncoding.Utf8);
}

4.byte數組的複製

public void ByteArrayCopy()
{
    // Initialize a byte array.
    byte[] bytes = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };

    // Create a buffer from the byte array.
    IBuffer buffer = CryptographicBuffer.CreateFromByteArray(bytes);

    // Encode the buffer into a hexadecimal string (for display);
    string hex = CryptographicBuffer.EncodeToHexString(buffer);

    // Copy the buffer back into a new byte array.
    byte[] newByteArray;
    CryptographicBuffer.CopyToByteArray(buffer, out newByteArray);
}

5.base64的壓縮與解壓

public void EncodeDecodeBase64()
{
    // Define a Base64 encoded string.
    String strBase64 = "uiwyeroiugfyqcajkds897945234==";

    // Decoded the string from Base64 to binary.
    IBuffer buffer = CryptographicBuffer.DecodeFromBase64String(strBase64);

    // Encode the buffer back into a Base64 string.
    String strBase64New = CryptographicBuffer.EncodeToBase64String(buffer);
}

public void EncodeDecodeHex()
{
    // Define a hexadecimal string.
    String strHex = "30310AFF";

    // Decode a hexadecimal string to binary.
    IBuffer buffer = CryptographicBuffer.DecodeFromHexString(strHex);

    // Encode the buffer back into a hexadecimal string.
    String strHexNew = CryptographicBuffer.EncodeToHexString(buffer);
}