@mon-studios/kms-signer

This is a fork of @rumblefishdev/eth-signer-kms. We thank the original developer for his work in building this library.

Web3 signer that derives address and signs transactions using AWS KMS.

Install

$ npm i @mon-studios/kms-signer

Requirements

aws-sdk

In order to work properly AWS KMS managed key must be:

• asymmetric
• able to sign and verify
• ECC_SECG_P256K1 specified

IAM permissions

Client using the library should have the following IAM permissions to the key that it uses:

  - Effect: Allow
    Action:
      - 'kms:Sign'
      - 'kms:GetPublicKey'
    Resource: !Ref KMSKeyArn

Usage

* Before use, make sure that AWS SDK is properly configured! Find out how to do it here.

KMSSigner is an ethers Signer instance that uses AWS KMS stored keys to sign ethereum transactions.

keyId can be obtained via KMS package of aws-sdk or directly via AWS console. https://github.com/ethereumjs/ethereumjs-monorepo

Parameters:

Parameter	Type	Default	Required	Description
keyId	string	null	[x]	Key ID of AWS KMS managed private key
provider	providers.Provider	null	[x]	Official doc
kmsInstance	AWS.KMS	new AWS.KMS()	[ ]	KMS instance from Official doc

Examples

For working examples, refer to the tests.

KmsSigner

• KmsSigner initialization

new KMSSigner(provider, keyId, kms)

• signMessage

await kmsSigner.signMessage(...)

• _signTypedData

await kmsSigner._signTypedData(...)

function getEthAddressFromKMS

• getEthAddressFromKMS

await getEthAddressFromKMS(...)