> ## Documentation Index > Fetch the complete documentation index at: https://docs.crossmint.com/llms.txt > Use this file to discover all available pages before exploring further. # DeviceSignerKeyStorage **This page has been updated for Wallets SDK V1.** If you are using the previous version, see the [previous version docs](/wallets/v0/overview) or the [V1 migration guide](/wallets/guides/migrate-to-v1). Defined in: [packages/wallets/src/utils/device-signers/DeviceSignerKeyStorage.ts:7](https://github.com/Crossmint/crossmint-sdk/blob/main/packages/wallets/src/utils/device-signers/DeviceSignerKeyStorage.ts#L7) ## Extended by * [`IframeDeviceSignerKeyStorage`](./IframeDeviceSignerKeyStorage) ## Constructors ### new DeviceSignerKeyStorage() > **new DeviceSignerKeyStorage**(`apiKey`): `DeviceSignerKeyStorage` Defined in: [packages/wallets/src/utils/device-signers/DeviceSignerKeyStorage.ts:8](https://github.com/Crossmint/crossmint-sdk/blob/main/packages/wallets/src/utils/device-signers/DeviceSignerKeyStorage.ts#L8) #### Parameters | Parameter | Type | | --------- | -------- | | `apiKey` | `string` | #### Returns `DeviceSignerKeyStorage` ## Methods ### deleteKey() > `abstract` **deleteKey**(`address`): `Promise`\<`void`> Defined in: [packages/wallets/src/utils/device-signers/DeviceSignerKeyStorage.ts:66](https://github.com/Crossmint/crossmint-sdk/blob/main/packages/wallets/src/utils/device-signers/DeviceSignerKeyStorage.ts#L66) Delete the key pair associated with the given wallet address. #### Parameters | Parameter | Type | Description | | --------- | -------- | -------------------------------------------- | | `address` | `string` | The wallet address whose key pair to remove. | #### Returns `Promise`\<`void`> *** ### generateKey() #### Call Signature > `abstract` **generateKey**(`params`): `Promise`\<`string`> Defined in: [packages/wallets/src/utils/device-signers/DeviceSignerKeyStorage.ts:17](https://github.com/Crossmint/crossmint-sdk/blob/main/packages/wallets/src/utils/device-signers/DeviceSignerKeyStorage.ts#L17) Generate a new P-256 key pair and persist it. ##### Parameters | Parameter | Type | Description | | ------------------------- | -------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | `params` | \{ `address`: `string`; `biometricPolicy`: `"always"` \| `"none"`; } | Key generation parameters. | | `params.address`? | `string` | Optional wallet address to associate the key with. If omitted, the key should be stored under a temporary identifier until [mapAddressToKey](./#mapaddresstokey) is called. | | `params.biometricPolicy`? | `"always"` \| `"none"` | - | ##### Returns `Promise`\<`string`> The uncompressed public key encoded as a base64 string. #### Call Signature > `abstract` **generateKey**(`params`): `Promise`\<`string`> Defined in: [packages/wallets/src/utils/device-signers/DeviceSignerKeyStorage.ts:21](https://github.com/Crossmint/crossmint-sdk/blob/main/packages/wallets/src/utils/device-signers/DeviceSignerKeyStorage.ts#L21) Generate a new P-256 key pair and persist it. ##### Parameters | Parameter | Type | Description | | -------------------------------- | ---------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | `params` | \{ `address`: `string`; `biometricExpirationTime`: `number`; `biometricPolicy`: `"session"`; } | Key generation parameters. | | `params.address`? | `string` | Optional wallet address to associate the key with. If omitted, the key should be stored under a temporary identifier until [mapAddressToKey](./#mapaddresstokey) is called. | | `params.biometricExpirationTime` | `number` | - | | `params.biometricPolicy` | `"session"` | - | ##### Returns `Promise`\<`string`> The uncompressed public key encoded as a base64 string. #### Call Signature > `abstract` **generateKey**(`params`): `Promise`\<`string`> Defined in: [packages/wallets/src/utils/device-signers/DeviceSignerKeyStorage.ts:26](https://github.com/Crossmint/crossmint-sdk/blob/main/packages/wallets/src/utils/device-signers/DeviceSignerKeyStorage.ts#L26) Generate a new P-256 key pair and persist it. ##### Parameters | Parameter | Type | Description | | --------------------------------- | ---------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | `params` | \{ `address`: `string`; `biometricExpirationTime`: `number`; `biometricPolicy`: `BiometricPolicy`; } | Key generation parameters. | | `params.address`? | `string` | Optional wallet address to associate the key with. If omitted, the key should be stored under a temporary identifier until [mapAddressToKey](./#mapaddresstokey) is called. | | `params.biometricExpirationTime`? | `number` | - | | `params.biometricPolicy`? | `BiometricPolicy` | - | ##### Returns `Promise`\<`string`> The uncompressed public key encoded as a base64 string. *** ### getDeviceName() > `abstract` **getDeviceName**(): `string` Defined in: [packages/wallets/src/utils/device-signers/DeviceSignerKeyStorage.ts:73](https://github.com/Crossmint/crossmint-sdk/blob/main/packages/wallets/src/utils/device-signers/DeviceSignerKeyStorage.ts#L73) Get a human-readable name for this device (e.g. "MacBook Pro", "iPhone 15"). Used to label device signers in the API for identification purposes. #### Returns `string` A descriptive name for the current device. *** ### getKey() > `abstract` **getKey**(`address`): `Promise`\<`string` | `null`> Defined in: [packages/wallets/src/utils/device-signers/DeviceSignerKeyStorage.ts:45](https://github.com/Crossmint/crossmint-sdk/blob/main/packages/wallets/src/utils/device-signers/DeviceSignerKeyStorage.ts#L45) Retrieve the public key for a given wallet address. #### Parameters | Parameter | Type | Description | | --------- | -------- | ----------------------------------------------- | | `address` | `string` | The wallet address whose public key to look up. | #### Returns `Promise`\<`string` | `null`> The base64-encoded public key, or `null` if no key is found for the address. *** ### hasKey() > `abstract` **hasKey**(`publicKeyBase64`): `Promise`\<`boolean`> Defined in: [packages/wallets/src/utils/device-signers/DeviceSignerKeyStorage.ts:52](https://github.com/Crossmint/crossmint-sdk/blob/main/packages/wallets/src/utils/device-signers/DeviceSignerKeyStorage.ts#L52) Check if a key with the given public key exists on this device. #### Parameters | Parameter | Type | Description | | ----------------- | -------- | ------------------------------------------ | | `publicKeyBase64` | `string` | The base64-encoded public key to look for. | #### Returns `Promise`\<`boolean`> `true` if the key exists on the device, `false` otherwise. *** ### mapAddressToKey() > `abstract` **mapAddressToKey**(`address`, `publicKeyBase64`): `Promise`\<`void`> Defined in: [packages/wallets/src/utils/device-signers/DeviceSignerKeyStorage.ts:38](https://github.com/Crossmint/crossmint-sdk/blob/main/packages/wallets/src/utils/device-signers/DeviceSignerKeyStorage.ts#L38) Associate an already-generated key pair with a wallet address. Used when the wallet address is not yet known at the time of key generation. #### Parameters | Parameter | Type | Description | | ----------------- | -------- | ------------------------------------------------------------------------ | | `address` | `string` | The wallet address to map the key to. | | `publicKeyBase64` | `string` | The base64-encoded public key returned by [generateKey](./#generatekey). | #### Returns `Promise`\<`void`> *** ### signMessage() > `abstract` **signMessage**(`address`, `message`): `Promise`\<\{ `r`: `string`; `s`: `string`; }> Defined in: [packages/wallets/src/utils/device-signers/DeviceSignerKeyStorage.ts:60](https://github.com/Crossmint/crossmint-sdk/blob/main/packages/wallets/src/utils/device-signers/DeviceSignerKeyStorage.ts#L60) Sign a message using the private key associated with the given wallet address. #### Parameters | Parameter | Type | Description | | --------- | -------- | -------------------------------------------------- | | `address` | `string` | The wallet address whose private key to sign with. | | `message` | `string` | The message string to sign. | #### Returns `Promise`\<\{ `r`: `string`; `s`: `string`; }> The ECDSA signature split into its `r` and `s` components, each as a hex string.