Function scratchstack_wrapper_aws_c_auth::aws_validate_v4a_authorization_value

pub unsafe extern "C" fn aws_validate_v4a_authorization_value(
    allocator: *mut aws_allocator,
    ecc_key: *mut aws_ecc_key_pair,
    string_to_sign_cursor: aws_byte_cursor,
    signature_value_cursor: aws_byte_cursor
) -> c_int

Another helper function to check a computed sigv4a signature.