C# (CSharp) RSACryptoServiceProvider.FromXmlString - 13 examples found. These are the top rated real world C# (CSharp) examples of RSACryptoServiceProvider.FromXmlString extracted from open source projects. You can rate examples to help us improve the quality of examples. C# (CSharp) RSACryptoServiceProvider.FromXmlString - 13 examples found. These are the top rated real world C# (CSharp) examples of RSACryptoServiceProvider.FromXmlString extracted from open source projects. You can rate examples to help us improve the quality of examples. Programming Language: C# (CSharp). Once an RSACryptoServiceProvider is created from a key pair (not just the public key), you can export just the public bytes and encode them as a public key PEM. Doing so will be compatible with the solution here. What's with this? Load the public + private keypair into an RSACryptoServiceProvider and then export it like so.
RSA(Rivest-Shamir-Adleman) is an Asymmetric encryption technique that uses two different keys as public and private keys to perform the encryption and decryption. With RSA, you can encrypt sensitive information with a public key and a matching private key is used to decrypt the encrypted message. Asymmetric encryption is mostly used when there are 2 different endpoints are involved such as VPN client and server, SSH, etc.
Below is an online tool to perform RSA encryption and decryption as a RSA calculator.
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First, we require public and private keys for RSA encryption and decryption. Hence, below is the tool to generate RSA key online. It generates RSA public key as well as the private key of size 512 bit, 1024 bit, 2048 bit, 3072 bit and 4096 bit with Base64 encoded.
By default, the private key is generated in PKCS#8 format and the public key is generated in X.509 format.
Generate RSA Key Online
Public Key
RSA Encryption and Decryption Online
Below is the tool for encryption and decryption. Either you can use the public/private keys generated above or supply your own public/private keys.
Any private or public key value that you enter or we generate is not stored on this site, this tool is provided via an HTTPS URL to ensure that private keys cannot be stolen.
This tool provides flexibility for RSA encrypt with public key as well as private key along with RSA decrypt with public or private key.
Rsacryptoserviceprovider Examples
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Rsacryptoserviceprovider Verifydata Example
Usage Guide - RSA Encryption and Decryption Online
In the first section of this tool, you can generate public or private keys. To do so, select the RSA key size among 515, 1024, 2048 and 4096 bit click on the button. This will generate the keys for you.
For encryption and decryption, enter the plain text and supply the key. As the encryption can be done using both the keys, you need to tell the tool about the key type that you have supplied with the help of radio button. By default, public key is selected. Then, you can use the cipher type to be used for the encryption. The different cipger options are RSA, RSA/ECB/PKCS1Padding and RSA/ECB/OAEPWithSHA-1AndMGF1Padding. Now, once you click the encrypt button the encrypted result will be shown in the textarea just below the button.
Remember, the encrypted result is by default base64 encoded.
Similarly, for decryption the process is same. Here, you need to enter the RSA encrypted text and the result will be a plain-text. You have both options to decrypt the encryption with public and private keys.
References
Other Free Tools
Rsacryptoserviceprovider Fromxmlstring Example
Rsacryptoserviceprovider C# Example Public Key
I want to encypt a small ( I'm aware that max 117 bytes may be encryptes
with RSA ) portion of data with private key and later to decrypt it with a
public key which will be embeded in my code.
The problem I am expieriencing is that I _cannot_ decrypt anything with
public key - no matter whether data was encrypted with public or private
key. And I _can_ decrypt everything with private key that was encrypted with
public _or_ private key.
As far as I understand, only the following situations must be possible in
public-private key encryption:
1) encrypt_with_public / decrypt_with_private
2) encrypt_with_private / decrypt_with_public
Could You please take a look at the short example below and tell me what I
am doing wrong.
Thank You for Your time!
Linas
// A new public-private key pair is generated after instantiation
RSACryptoServiceProvider RSA = new
System.Security.Cryptography.RSACryptoServiceProvider();
string publicKey = RSA.ToXmlString( false ); // gets the public key as XML
string privateKey = RSA.ToXmlString( true ); // gets the private key as XML
// The private key contains a public one (at the beginning of XML string) -
I suppose it is normal
Console.WriteLine('nnPUBLIC KEYn' + publicKey );
Console.WriteLine('nnPRIVATE KEYn' + privateKey );
string str = 'AAA';
RSACryptoServiceProvider RSA2 = new RSACryptoServiceProvider();
// Load private key
RSA2.FromXmlString( privateKey );
// Encrypt with private
byte[] EncryptedStrAsByt = RSA2.Encrypt(
System.Text.Encoding.Default.GetBytes( str ), false );
string EncryptedStrAsString = System.Text.Encoding.Default.GetString(
EncryptedStrAsByt );
RSACryptoServiceProvider RSA3 = new RSACryptoServiceProvider();
// Load public key
RSA3.FromXmlString( publicKey );
// Try to decrypt with public
byte[] DecryptedStrAsByt = RSA3.Decrypt(
System.Text.Encoding.Default.GetBytes( EncryptedStrAsString ), false );
string DecryptedStrAsString = System.Text.Encoding.Default.GetString(
DecryptedStrAsByt );
Console.WriteLine('Decrypted string = {0}', DecryptedStrAsString );
---------------------------------------------------------------------------
I get the following exception when trying to decrypt
System.Security.Cryptography.CryptographicException: Bad Key.
at
System.Security.Cryptography.RSACryptoServiceProvider._DecryptPKWin2KEnh(I
ntPtr hPubKey, Byte[] rgbKey, Boolean fOAEP)
at System.Security.Cryptography.RSACryptoServiceProvider.Decrypt(Byte[]
rgb,
Boolean fOAEP)
at Test.Main(String[] args) in d:testtest.cs:line 116
Decryption succeeds if I change 'RSA3.FromXmlString( publicKey );' to
'RSA3.FromXmlString( privateKey );'
What is the problem ?
P.S. I tried to pass instance of CspParameters as a RSACryptoServiceProvider
constructors parameter but it does not work as I expect.
I don't want to use any key containers ( that are stored in user profile
data in registry if I understood correctly ) because a program that uses
decryption would run of various computers (could be spread as a demo
program, etc ).