I'm trying to create C# that does this in CryptoJS
var hash = CryptoJS.HmacSHA512(msg, key);
var crypt = CryptoJS.enc.Utf8.parse(hash.toString());
var base64 = CryptoJS.enc.Base64.stringify(crypt);
My question is in the second statement where hash variable is put into a string then parsed.
Is there an equivalent in C#? Once parsed how do you encode the result into Utf8.
Thanks
I'm not 100% if I understand exactly which piece you are looking for here. But there is no such thing as a UTF8 System.String in C#. However when you write a string to a stream you can choose the encoding of the bytes in the stream to be UTF8
For example by passing that encoding as an option to a StreamWriter.
using (StreamWriter writer = new StreamWriter(stream, Encoding.UTF8)) {
writer.Write(text);
}
My boss find the answer to this. The difference is that before you return the base64 string using C# you have to change the bytes into hexadecimal.
var encoder = new UTF8Encoding();
byte[] keyBytes = encoder.GetBytes(key);
var newlinemsg = action + "\n" + msg;
byte[] messageBytes = encoder.GetBytes(newlinemsg);
byte[] hashBytes = new HMACSHA512(keyBytes).ComputeHash(messageBytes);
var hexString = ToHexString(hashBytes);
var base64 = Convert.ToBase64String(encoder.GetBytes(hexString));
Related
Can anyone please let me know where I made a mistake in this code? This code is written in C#.NET. I need to write an algorithm for encoding a string using base64 format using C#.NET, and then decoded with base64_decode() using PHP. Please see the snippit below:
System.Security.Cryptography.RijndaelManaged rijndaelCipher = new System.Security.Cryptography.RijndaelManaged();
rijndaelCipher.Mode = System.Security.Cryptography.CipherMode.CBC;
rijndaelCipher.Padding = System.Security.Cryptography.PaddingMode.Zeros;
rijndaelCipher.KeySize = 256;
rijndaelCipher.BlockSize = 128;
byte[] pwdBytes = System.Text.Encoding.UTF8.GetBytes(_key);
byte[] keyBytes = new byte[16];
int len = pwdBytes.Length;
if (len > keyBytes.Length) len = keyBytes.Length;
System.Array.Copy(pwdBytes, keyBytes, len);
rijndaelCipher.Key = keyBytes;
rijndaelCipher.IV = keyBytes;
System.Security.Cryptography.ICryptoTransform transform = rijndaelCipher.CreateEncryptor();
byte[] plainText = Encoding.UTF8.GetBytes(unencryptedString);
byte[] cipherBytes = transform.TransformFinalBlock(plainText, 0, plainText.Length);
return Convert.ToBase64String(cipherBytes);
I think your code sample is doing "encryption", and you want "encoding".
For encoding a string with Based64 in C#, it should look like this:
static public string EncodeTo64(string toEncode)
{
byte[] toEncodeAsBytes = System.Text.ASCIIEncoding.ASCII.GetBytes(toEncode);
string returnValue = System.Convert.ToBase64String(toEncodeAsBytes);
return returnValue;
}
And the PHP should look like this:
<?php
$str = 'VGhpcyBpcyBhbiBlbmNvZGVkIHN0cmluZw==';
echo base64_decode($str);
?>
I need to write an algorithm for encoding a string using base64 format using C#.net
That's actually quite easy. You don't need all that cryptography stuff that your copy-and-pasted code is using. The following suffices:
byte[] bytes = Encoding.UTF8.GetBytes(inputString);
string outputString = Convert.ToBase64String(bytes);
If you plan to send the data from C# to PHP via a HTTP GET request, don't forget to UrlEncode it. See this question for details:
C# to PHP base64 encode/decode
I just tried to create a MD5 hash program in C#. My friend give me a sample code about this but when I try to run a test with "123456", instead of returning the correct hash result
e10adc3949ba59abbe56e057f20f883e
it returns the result
ce0bfd15059b68d67688884d7a3d3e8c
I tried to read the main code but still cannot get anything!
string value = textBox1.Text;
byte[] valueBytes = new byte[value.Length * 2];
Encoder encoder = Encoding.Unicode.GetEncoder();
encoder.GetBytes(value.ToCharArray(), 0, value.Length, valueBytes, 0, true);
MD5 md5 = new MD5CryptoServiceProvider();
byte[] hashBytes = md5.ComputeHash(valueBytes);
StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < hashBytes.Length; i++)
{
stringBuilder.Append(hashBytes[i].ToString("x2"));
}
textBox2.Text = stringBuilder.ToString();
Looks like your friend used Encoding.Default instead of Encoding.Unicode
Strings in .NET are UTF16. Hashing works on bytes though, not strings. The string has to be converted to bytes. To do that, a specific encoding has to be used .
If the .NET native encoding is use, ie UTF16, the original byte buffer will be 12 bytes long and the hex representation of the hash will be ce0bfd15059b68d67688884d7a3d3e8c :
var valueBytes=Encoding.Unicode.GetBytes("123456");
Debug.Assert(valueBytes.Length==12);
var md5=System.Security.Cryptography.MD5.Create();
byte[] hashBytes = md5.ComputeHash(valueBytes);
var hexText=String.Join("",hashBytes.Select(c=>c.ToString("x2")));
If the 7-bit US-ASCII encoding is used though, the array will be 6 bytes long and the hex representation will be e10adc3949ba59abbe56e057f20f883e :
var valueBytes=Encoding.ASCII.GetBytes("123456");
Debug.Assert(valueBytes.Length==6);
var md5=System.Security.Cryptography.MD5.Create();
byte[] hashBytes = md5.ComputeHash(valueBytes);
var hexText=String.Join("",hashBytes.Select(c=>c.ToString("x2")));
The fist 127 bytes of most codepages match the 7-bit US-ASCII characters, so most encodings, including UTF8, would return e10adc3949ba59abbe56e057f20f883e. The following encodings would return the same hash string : Encoding.GetEncoding(1251) (Cyrillic), Encoding.GetEncoding(20000) (Chinese Traditiona) would result in the same hash.
The Encoding.Default value returns the encoding that corresponds to the computer's system locale. It's the encoding used by non-Unicode applications like C++ applications compiled with ANSI string types.
Encoding.GetEncoding(20273) though would return a different value - that's an IBM EBCDIC that used different bytes even for the english alphabet and digits. This will return : 73e00d17ee63efb9ae91d274baae2459
You're expecting to have UTF8 string, so why do you use Unicode encoding? Use UTF8 and you'll get the result that you expect:
string value = "123456";
byte[] valueBytes = new byte[value.Length]; // <-- don't multiply by 2!
Encoder encoder = Encoding.UTF8.GetEncoder(); // <-- UTF8 here
encoder.GetBytes(value.ToCharArray(), 0, value.Length, valueBytes, 0, true);
MD5 md5 = new MD5CryptoServiceProvider();
byte[] hashBytes = md5.ComputeHash(valueBytes);
StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < hashBytes.Length; i++)
{
stringBuilder.Append(hashBytes[i].ToString("x2"));
}
Console.WriteLine(stringBuilder.ToString()); // "e10adc3949ba59abbe56e057f20f883e"
I need to convert a .csv file from UTF-8 to W1252 (West European).
I have tried the example from the MSDN page and the following code without succes
Encoding utf8 = Encoding.UTF8;
//Encoding utf8 = new UTF8Encoding();
Encoding win1252 = Encoding.GetEncoding(1252);
string src = today.ToString("dd-MM-yyyy") + "-ups.csv";
string source = File.ReadAllText(src);
byte[] input = source.ToUTF8ByteArray();
byte[] output = Encoding.Convert(utf8, win1252, input);
File.WriteAllText(src + "w1252", win1252.GetString(output));
with the extension method
public static class StringHelper
{
public static byte[] ToUTF8ByteArray(this string str)
{
Encoding encoding = new UTF8Encoding();
return encoding.GetBytes(str);
}
}
After this, the file still reads with broken characters when opened as W1252 and works perfectly if opening with UTF-8, confirming that it is not good.
Thanks!
Why not read in the initial encoding (Encoding.UTF8), and write in target one (Encoding.GetEncoding(1252)):
string fileName = #"C:\MyFile.csv";
File.WriteAllText(fileName, File
.ReadAllText(fileName, Encoding.UTF8), Encoding.GetEncoding(1252));
Sorry for the long post, will try to make this as short as possible.
I'm consuming a json API (which has zero documentation of course) which returns something like this:
{
uncompressedlength: 743637,
compressedlength: 234532,
compresseddata: "lkhfdsbjhfgdsfgjhsgfjgsdkjhfgj"
}
The data (xml in this case) is compressed and then base64 encoded data which I am attempting to extract. All I have is their demo code written in perl to decode it:
use Compress::Zlib qw(uncompress);
use MIME::Base64 qw(decode_base64);
my $uncompresseddata = uncompress(decode_base64($compresseddata));
Seems simple enough.
I've tried a number of methods to decode the base64:
private string DecodeFromBase64(string encodedData)
{
byte[] encodedDataAsBytes = System.Convert.FromBase64String(encodedData);
string returnValue = System.Text.Encoding.Unicode.GetString(encodedDataAsBytes);
return returnValue;
}
public string base64Decode(string data)
{
try
{
System.Text.UTF8Encoding encoder = new System.Text.UTF8Encoding();
System.Text.Decoder utf8Decode = encoder.GetDecoder();
byte[] todecode_byte = Convert.FromBase64String(data);
int charCount = utf8Decode.GetCharCount(todecode_byte, 0, todecode_byte.Length);
char[] decoded_char = new char[charCount];
utf8Decode.GetChars(todecode_byte, 0, todecode_byte.Length, decoded_char, 0);
string result = new String(decoded_char);
return result;
}
catch (Exception e)
{
throw new Exception("Error in base64Decode" + e.Message);
}
}
And I have tried using Ionic.Zip.dll (DotNetZip?) and zlib.net to inflate the Zlib compression. But everything errors out. I am trying to track down where the problem is coming from. Is it the base64 decode or the Inflate?
I always get an error when inflating using zlib: I get a bad Magic Number error using zlib.net and I get "Bad state (invalid stored block lengths)" when using DotNetZip:
string decoded = DecodeFromBase64(compresseddata);
string decompressed = UnZipStr(GetBytes(decoded));
public static string UnZipStr(byte[] input)
{
using (MemoryStream inputStream = new MemoryStream(input))
{
using (Ionic.Zlib.DeflateStream zip =
new Ionic.Zlib.DeflateStream(inputStream, Ionic.Zlib.CompressionMode.Decompress))
{
using (StreamReader reader =
new StreamReader(zip, System.Text.Encoding.UTF8))
{
return reader.ReadToEnd();
}
}
}
}
After reading this:
http://george.chiramattel.com/blog/2007/09/deflatestream-block-length-does-not-match.html
And listening to one of the comments. I changed the code to this:
MemoryStream memStream = new MemoryStream(Convert.FromBase64String(compresseddata));
memStream.ReadByte();
memStream.ReadByte();
DeflateStream deflate = new DeflateStream(memStream, CompressionMode.Decompress);
string doc = new StreamReader(deflate, System.Text.Encoding.UTF8).ReadToEnd();
And it's working fine.
This was the culprit:
http://george.chiramattel.com/blog/2007/09/deflatestream-block-length-does-not-match.html
With skipping the first two bytes I was able to simplify it to:
MemoryStream memStream = new MemoryStream(Convert.FromBase64String(compresseddata));
memStream.ReadByte();
memStream.ReadByte();
DeflateStream deflate = new DeflateStream(memStream, CompressionMode.Decompress);
string doc = new StreamReader(deflate, System.Text.Encoding.UTF8).ReadToEnd();
First, use System.IO.Compression.DeflateStream to re-inflate the data. You should be able to use a MemoryStream as the input stream. You can create a MemoryStream using the byte[] result of Convert.FromBase64String.
You are likely causing all kinds of trouble trying to convert the base64 result to a given encoding; use the raw data directly to Deflate.
Can anyone please let me know where I made a mistake in this code? This code is written in C#.NET. I need to write an algorithm for encoding a string using base64 format using C#.NET, and then decoded with base64_decode() using PHP. Please see the snippit below:
System.Security.Cryptography.RijndaelManaged rijndaelCipher = new System.Security.Cryptography.RijndaelManaged();
rijndaelCipher.Mode = System.Security.Cryptography.CipherMode.CBC;
rijndaelCipher.Padding = System.Security.Cryptography.PaddingMode.Zeros;
rijndaelCipher.KeySize = 256;
rijndaelCipher.BlockSize = 128;
byte[] pwdBytes = System.Text.Encoding.UTF8.GetBytes(_key);
byte[] keyBytes = new byte[16];
int len = pwdBytes.Length;
if (len > keyBytes.Length) len = keyBytes.Length;
System.Array.Copy(pwdBytes, keyBytes, len);
rijndaelCipher.Key = keyBytes;
rijndaelCipher.IV = keyBytes;
System.Security.Cryptography.ICryptoTransform transform = rijndaelCipher.CreateEncryptor();
byte[] plainText = Encoding.UTF8.GetBytes(unencryptedString);
byte[] cipherBytes = transform.TransformFinalBlock(plainText, 0, plainText.Length);
return Convert.ToBase64String(cipherBytes);
I think your code sample is doing "encryption", and you want "encoding".
For encoding a string with Based64 in C#, it should look like this:
static public string EncodeTo64(string toEncode)
{
byte[] toEncodeAsBytes = System.Text.ASCIIEncoding.ASCII.GetBytes(toEncode);
string returnValue = System.Convert.ToBase64String(toEncodeAsBytes);
return returnValue;
}
And the PHP should look like this:
<?php
$str = 'VGhpcyBpcyBhbiBlbmNvZGVkIHN0cmluZw==';
echo base64_decode($str);
?>
I need to write an algorithm for encoding a string using base64 format using C#.net
That's actually quite easy. You don't need all that cryptography stuff that your copy-and-pasted code is using. The following suffices:
byte[] bytes = Encoding.UTF8.GetBytes(inputString);
string outputString = Convert.ToBase64String(bytes);
If you plan to send the data from C# to PHP via a HTTP GET request, don't forget to UrlEncode it. See this question for details:
C# to PHP base64 encode/decode