BuildRSASignature signs a string using a private RSA signing key.

MakeSignRsaHandler creates an http handler that signs the request using an RSA private key.

NewIirRsaClient creates a new ssm client that signs requests with both instance identity credentials and private key.

NewRsaClient creates a new SSM client instance that signs requests using a private key.

SsmAuthHeader is the header that holds private key signature for iir-rsa signed requests.