Refactor and cleanup codes. No functional changes.

common/python/BUILD

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+################################################################################
+# Copyright 2016 Google LLC.
+#
+# This software is licensed under the terms defined in the Widevine Master
+# License Agreement. For a copy of this agreement, please contact
+# widevine-licensing@google.com.
+################################################################################
+
+#
+# Description:
+#   Build file for CLIF wrappers of Widevine common modules.
+
+package(default_visibility = ["//visibility:public"])
+
+load("//devtools/clif/python:clif_build_rule.bzl", "py_clif_cc")
+
+py_clif_cc(
+    name = "aes_cbc_util",
+    srcs = ["aes_cbc_util.clif"],
+    deps = [
+        "//common:aes_cbc_util",
+    ],
+)
+
+py_clif_cc(
+    name = "certificate_type",
+    srcs = ["certificate_type.clif"],
+    deps = [
+        "//common:certificate_type",
+    ],
+)
+
+py_clif_cc(
+    name = "crypto_util",
+    srcs = ["crypto_util.clif"],
+    deps = [
+        "//common:crypto_util",
+    ],
+)
+
+py_clif_cc(
+    name = "drm_root_certificate",
+    srcs = ["drm_root_certificate.clif"],
+    clif_deps = [
+        ":certificate_type",
+    ],
+    pyclif_deps = [
+        "//protos/public:drm_certificate_pyclif",
+        "//protos/public:signed_drm_certificate_pyclif",
+    ],
+    deps = [
+        "//util/task/python:status_clif",
+        "//common:drm_root_certificate",
+    ],
+)
+
+py_clif_cc(
+    name = "rsa_test_keys",
+    testonly = 1,
+    srcs = ["rsa_test_keys.clif"],
+    deps = [
+        "//common:rsa_test_keys",
+    ],
+)
+
+py_clif_cc(
+    name = "rsa_key",
+    srcs = ["rsa_key.clif"],
+    deps = [
+        "//common:rsa_key",
+    ],
+)
+
+py_clif_cc(
+    name = "drm_service_certificate",
+    srcs = ["drm_service_certificate.clif"],
+    clif_deps = [
+        ":certificate_type",
+        ":drm_root_certificate",
+    ],
+    deps = [
+        "//util/task/python:status_clif",
+        "//common:drm_service_certificate",
+    ],
+)
+
+py_clif_cc(
+    name = "signing_key_util",
+    srcs = ["signing_key_util.clif"],
+    pyclif_deps = [
+        "//protos/public:license_protocol_pyclif",
+    ],
+    deps = [
+        "//common:signing_key_util",
+    ],
+)
+
+py_clif_cc(
+    name = "test_drm_certificates",
+    testonly = 1,
+    srcs = ["test_drm_certificates.clif"],
+    deps = [
+        "//common:test_drm_certificates",
+    ],
+)

common/python/aes_cbc_util.clif

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+################################################################################
+# Copyright 2018 Google LLC.
+#
+# This software is licensed under the terms defined in the Widevine Master
+# License Agreement. For a copy of this agreement, please contact
+# widevine-licensing@google.com.
+################################################################################
+
+from "common/aes_cbc_util.h":
+  namespace `widevine::crypto_util`:
+    def `EncryptAesCbc` as Encrypt(key: bytes, iv: bytes, plaintext: bytes) -> bytes

common/python/certificate_type.clif

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+################################################################################
+# Copyright 2018 Google LLC.
+#
+# This software is licensed under the terms defined in the Widevine Master
+# License Agreement. For a copy of this agreement, please contact
+# widevine-licensing@google.com.
+################################################################################
+
+from "common/certificate_type.h":
+  namespace `widevine`:
+    enum CertificateType

common/python/crypto_util.clif

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+################################################################################
+# Copyright 2018 Google LLC.
+#
+# This software is licensed under the terms defined in the Widevine Master
+# License Agreement. For a copy of this agreement, please contact
+# widevine-licensing@google.com.
+################################################################################
+
+from "common/crypto_util.h":
+  namespace `widevine::crypto_util`:
+    const `kSigningKeyLabel` as SIGNING_KEY_LABEL: bytes
+    const `kSigningKeySizeBits` as SIGNING_KEY_SIZE_BITS: int
+
+    def DeriveKey(key: bytes, label: bytes, context: bytes, size_bits: uint32_t) -> bytes
+    def CreateSignatureHmacSha256(key: bytes, message: bytes) -> bytes

common/python/drm_root_certificate.clif

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+################################################################################
+# Copyright 2018 Google LLC.
+#
+# This software is licensed under the terms defined in the Widevine Master
+# License Agreement. For a copy of this agreement, please contact
+# widevine-licensing@google.com.
+################################################################################
+
+from "util/task/python/clif.h" import *
+from "common/python/certificate_type.h" import *
+from "protos/public/drm_certificate_pyclif.h" import *
+from "protos/public/signed_drm_certificate_pyclif.h" import *
+
+from "common/drm_root_certificate.h":
+  namespace `widevine`:
+    class DrmRootCertificate:
+      def VerifyCertificate(self,
+                            serialized_certificate: bytes) -> (status: Status,
+							       signed_certificate: SignedDrmCertificate,
+						               certificate: DrmCertificate)
+    staticmethods from `DrmRootCertificate`:
+      def CreateByType(cert_type: CertificateType) -> (new_root_cert: DrmRootCertificate,
+                                                       status: Status)

common/python/drm_service_certificate.clif

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+################################################################################
+# Copyright 2018 Google LLC.
+#
+# This software is licensed under the terms defined in the Widevine Master
+# License Agreement. For a copy of this agreement, please contact
+# widevine-licensing@google.com.
+################################################################################
+
+from "util/task/python/clif.h" import *
+from "common/python/drm_root_certificate.h" import *
+from "common/drm_service_certificate.h":
+  namespace `widevine`:
+    staticmethods from `DrmServiceCertificate`:
+      def AddDrmServiceCertificate(
+              root_certificate: DrmRootCertificate,
+              service_certificate: bytes,
+              service_private_key: bytes,
+              service_private_key_passphrase: bytes) -> Status

common/python/rsa_key.clif

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+################################################################################
+# Copyright 2018 Google LLC.
+#
+# This software is licensed under the terms defined in the Widevine Master
+# License Agreement. For a copy of this agreement, please contact
+# widevine-licensing@google.com.
+################################################################################
+
+from "common/rsa_key.h":
+  namespace `widevine`:
+    class RsaPublicKey:
+      def VerifySignature(self, message: bytes, signature: bytes) -> bool
+
+    staticmethods from `RsaPublicKey`:
+      def Create(serialized_key: bytes) -> RsaPublicKey

common/python/rsa_test_keys.clif

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+################################################################################
+# Copyright 2018 Google LLC.
+#
+# This software is licensed under the terms defined in the Widevine Master
+# License Agreement. For a copy of this agreement, please contact
+# widevine-licensing@google.com.
+################################################################################
+
+from "common/rsa_test_keys.h":
+  namespace `widevine`:
+    class RsaTestKeys:
+      def private_test_key_1_3072_bits(self) -> bytes
+      def public_test_key_1_3072_bits(self) -> bytes
+      def private_test_key_2_2048_bits(self) -> bytes
+      def public_test_key_2_2048_bits(self) -> bytes
+      def private_test_key_3_2048_bits(self) -> bytes
+      def public_test_key_3_2048_bits(self) -> bytes
+      def private_test_key_2_carmichael_totient_2048_bits(self) -> bytes
+      def private_test_key_3_carmichael_totient_2048_bits(self) -> bytes
+      def private_test_key_4_carmichael_totient_2048_bits(self) -> bytes

common/python/signing_key_util.clif

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+################################################################################
+# Copyright 2018 Google LLC.
+#
+# This software is licensed under the terms defined in the Widevine Master
+# License Agreement. For a copy of this agreement, please contact
+# widevine-licensing@google.com.
+################################################################################
+
+from "protos/public/license_protocol_pyclif.h" import *
+
+from "common/signing_key_util.h":
+  namespace `widevine`:
+    def SigningKeyMaterialSizeBits(protocol_version: ProtocolVersion) -> uint32_t
+    def GetClientSigningKey(derived_key: bytes, protocol_version: ProtocolVersion) -> bytes

common/python/test_drm_certificates.clif

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+################################################################################
+# Copyright 2018 Google LLC.
+#
+# This software is licensed under the terms defined in the Widevine Master
+# License Agreement. For a copy of this agreement, please contact
+# widevine-licensing@google.com.
+################################################################################
+
+from "common/test_drm_certificates.h":
+  namespace `widevine`:
+    class TestDrmCertificates:
+      def test_root_certificate(self) -> bytes
+      def test_intermediate_certificate(self) -> bytes
+      def test_user_device_certificate(self) -> bytes
+      def test_service_certificate(self) -> bytes