# ecrecover

[**api**](https://near-sdk-js.gitbook.io/near-sdk-js/api) • **Docs**

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[near-sdk-js v2.0.0](https://near-sdk-js.gitbook.io/near-sdk-js/packages) / [api](https://near-sdk-js.gitbook.io/near-sdk-js/api) / ecrecover

## Function: ecrecover()

> **ecrecover**(`hash`, `sig`, `v`, `malleabilityFlag`): `Uint8Array` | `null`

Recovers an ECDSA signer address from a 32-byte message hash and a corresponding signature along with v recovery byte. Takes in an additional flag to check for malleability of the signature which is generally only ideal for transactions.

### Parameters

• **hash**: `Uint8Array`

32-byte message hash

• **sig**: `Uint8Array`

signature

• **v**: `number`

number of recovery byte

• **malleabilityFlag**: `number`

whether to check malleability

### Returns

`Uint8Array` | `null`

64 bytes representing the public key if the recovery was successful.

### Defined in

[packages/near-sdk-js/src/api.ts:908](https://github.com/near/near-sdk-js/blob/b58ac04fc6dff2f1120e9098c0cb059493486598/packages/near-sdk-js/src/api.ts#L908)