# Key management with NetCasperSDK

Use the `PublicKey` and `KeyPair` classes to work with public keys and private keys respectively.

### Creating new key pairs
To create a new key pair use the method `CreateNew()` indicating the algorithm used:

var newKeyPair = KeyPair.CreateNew(KeyAlgo.ED25519);

var anotherKeyPair = KeyPair.CreateNew(KeyAlgo.SECP256K1);

### Reading keys from PEM files

To read a key from a PEM file use the method `FromPEM()`:

var pk = PublicKey.FromPem("/tmp/my_pk.pem");

var keypair = KeyPair.FromPem("/tmp/faucetact.pem");

When working with a private key you can always get its public key:

var faucetPK = keypair.PublicKey;

### Writing keys to PEM files
When you create a new key you may want to save the private part in a file for later usage. Currently, we support writing the keys to PEM files:

newKeyPair.WriteToPem("newED25519_sk.pem");

anotherKeyPair.WriteToPem("newSECP256K1_sk.pem");

You can save to a file also the public key part:

newKeyPair.WritePublicKeyToPem("newED25519_pk.pem");

newKeyPair.PublicKey.WriteToPem("newED25519_pk2.pem");

### Creating public key from values

If the string has the algorithm prefix:

var pk = PublicKey.FromHexString("012629e6d0eed7db2d232b5b0a35d729796bb6f3cbd12811538a61de78c75870ba");

Or indicate the algorithm explicitly:

var pk2 = PublicKey.FromRawBytes("2629e6d0eed7db2d232b5b0a35d729796bb6f3cbd12811538a61de78c75870ba", KeyAlgo.ED25519);

var pk3 = PublicKey.FromRawBytes("02793d6a3940502b0946bed65719d3e75d089a25b52a8fc740373c48a8031e83b3", KeyAlgo.SECP256K1);