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The data protection code base includes a package Microsoft.AspNetCore.Cryptography.KeyDerivation which contains cryptographic key derivation functions. This package is a standalone component and has no dependencies on the rest of the data protection system. It can be used completely independently. The source exists alongside the data protection code base as a convenience.
The package currently offers a method
KeyDerivation.Pbkdf2 which allows hashing a password using the PBKDF2 algorithm. This API is very similar to the .NET Framework's existing Rfc2898DeriveBytes type, but there are three important distinctions:
KeyDerivation.Pbkdf2method supports consuming multiple PRFs (currently
HMACSHA512), whereas the
Rfc2898DeriveBytestype only supports
KeyDerivation.Pbkdf2method detects the current operating system and attempts to choose the most optimized implementation of the routine, providing much better performance in certain cases. (On Windows 8, it offers around 10x the throughput of
KeyDerivation.Pbkdf2method requires the caller to specify all parameters (salt, PRF, and iteration count). The
Rfc2898DeriveBytestype provides default values for these.
See the source code for ASP.NET Core Identity's
PasswordHasher type for a real-world use case.
You may generate an RSA private key with the help of this tool. Additionally, it will display the public key of a generated or pasted private key.
RSA is an asymmetric encryption algorithm. With a given key pair, data that is encrypted with one key can only be decrypted by the other. This is useful for encrypting data between a large number of parties; only one key pair per person need exist. RSA is widely used across the internet with HTTPS.
To generate a key pair, select the bit length of your key pair and click Generate key pair. Depending on length, your browser may take a long time to generate the key pair. A 1024-bit key will usually be ready instantly, while a 4096-bit key may take up to several minutes. For a faster and more secure method, see Do It Yourself below.
CryptoTools.net does not yet have a tool for facilitating the encryption and decryption of data using RSA, but you may Do It Yourself with the instructions below.
Do It Yourself
For these steps, you will need a command line shell with OpenSSL. Ideally, you should have a private key of your own and a public key from someone else. For demonstration, we will only use a single key pair.
Generate Private Key
Run this command to generate a 4096-bit private key and output it to the private.pem file. If you like, you may change the key length and/or output file.
Derive Public Key
Given a private key, you may derive its public key and output it to public.pem using this command. (You may also paste your OpenSSL-generated private key into the form above to get its public key.)
.net Encryption Class
We can now use this key pair to encrypt and decrypt a file, data.txt.
Asp Net Encryption Key Generator Software
Given the encrypted file from the previous step, you may decrypt it like so.