code: def verify_rsa_sha1(request, rsa_public_key):
      
      norm_params = normalize_parameters(request.params)
      bs_uri = base_string_uri(request.uri)
      sig_base_str = signature_base_string(request.http_method, bs_uri,
                                           norm_params).encode('utf-8')
      sig = binascii.a2b_base64(request.signature.encode('utf-8'))
  
      alg = _jwt_rs1_signing_algorithm()
      key = _prepare_key_plus(alg, rsa_public_key)
  
      verify_ok = alg.verify(sig_base_str, key, sig)
      if not verify_ok:
          log.debug('Verify RSA-SHA1 failed: signature base string: %s',
                    sig_base_str)
      return verify_ok
docs: Verify a RSASSA-PKCS #1 v1.5 base64 encoded signature.
  
      Per `section 3.4.3`_ of the spec.
  
      Note this method requires the jwt and cryptography libraries.
  
      .. _`section 3.4.3`: https://tools.ietf.org/html/rfc5849#section-3.4.3
  
      To satisfy `RFC2616 section 5.2`_ item 1, the request argument's uri
      attribute MUST be an absolute URI whose netloc part identifies the
      origin server or gateway on which the resource resides. Any Host
      item of the request argument's headers dict attribute will be
      ignored.
  
      .. _`RFC2616 section 5.2`: https://tools.ietf.org/html/rfc2616#section-5.2