@metamask/bip32-example-snap

@metamask/bip32-example-snap

This snap demonstrates the use of snap_getBip32Entropy and snap_getBip32PublicKey to derive a BIP-32 public key and private key from the user's secret recovery phrase.

Snap manifest

Note: Using snap_getBip32Entropy and snap_getBip32PublicKey requires their respective snap_getBip32Entropy and snap_getBip32PublicKey permissions. Refer to the documentation for more information.

Along with other permissions, the manifest of this snap includes the snap_getBip32Entropy and snap_getBip32PublicKey permissions:

{
  "initialPermissions": {
    "snap_getBip32Entropy": [
      {
        "path": ["m", "44'", "0'"],
        "curve": "secp256k1"
      },
      {
        "path": ["m", "44'", "0'"],
        "curve": "ed25519"
      }
    ],
    "snap_getBip32PublicKey": [
      {
        "path": ["m", "44'", "0'"],
        "curve": "secp256k1"
      }
    ]
  }
}

Each of the items in the snap_getBip32Entropy and snap_getBip32PublicKey permissions is an object with the following properties:

• path: The BIP-32 derivation path to use.
• curve: The elliptic curve to use. These methods support secp256k1 and ed25519.

Snap usage

This snap exposes an onRpcRequest handler, which supports the following JSON-RPC methods:

• getPublicKey: Get the public key for the given path and curve.
• signMessage: Sign a message with the private key for the given path and curve. The message is signed with the chosen curve's signing algorithm (ECDSA for secp256k1 and EdDSA for ed25519).

For more information, you can refer to the end-to-end tests.