Function signSha256

signSha256(
privateKey: ArrayBuffer | Uint8Array<ArrayBufferLike>,
data: ArrayBuffer | Uint8Array<ArrayBufferLike>,
): ArrayBuffer
Sign data with RSA private key using SHA-256
Parameters
- privateKey: ArrayBuffer | Uint8Array<ArrayBufferLike>
  Private key in PEM format
- data: ArrayBuffer | Uint8Array<ArrayBufferLike>
  Data to sign
Returns ArrayBuffer
Signature as ArrayBuffer