97 lines
2.9 KiB
C++
97 lines
2.9 KiB
C++
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <utils/Errors.h>
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#ifndef CRYPTO_API_H_
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#define CRYPTO_API_H_
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namespace android {
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struct AString;
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struct CryptoPlugin;
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struct CryptoFactory {
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CryptoFactory() {}
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virtual ~CryptoFactory() {}
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virtual bool isCryptoSchemeSupported(const uint8_t uuid[16]) const = 0;
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virtual status_t createPlugin(
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const uint8_t uuid[16], const void *data, size_t size,
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CryptoPlugin **plugin) = 0;
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private:
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CryptoFactory(const CryptoFactory &);
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CryptoFactory &operator=(const CryptoFactory &);
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};
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struct CryptoPlugin {
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enum Mode {
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kMode_Unencrypted = 0,
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kMode_AES_CTR = 1,
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// Neither key nor iv are being used in this mode.
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// Each subsample is encrypted w/ an iv of all zeroes.
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kMode_AES_WV = 2, // FIX constant
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};
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struct SubSample {
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size_t mNumBytesOfClearData;
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size_t mNumBytesOfEncryptedData;
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};
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CryptoPlugin() {}
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virtual ~CryptoPlugin() {}
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// If this method returns false, a non-secure decoder will be used to
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// decode the data after decryption. The decrypt API below will have
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// to support insecure decryption of the data (secure = false) for
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// media data of the given mime type.
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virtual bool requiresSecureDecoderComponent(const char *mime) const = 0;
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// If the error returned falls into the range
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// ERROR_DRM_VENDOR_MIN..ERROR_DRM_VENDOR_MAX, errorDetailMsg should be
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// filled in with an appropriate string.
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// At the java level these special errors will then trigger a
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// MediaCodec.CryptoException that gives clients access to both
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// the error code and the errorDetailMsg.
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// Returns a non-negative result to indicate the number of bytes written
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// to the dstPtr, or a negative result to indicate an error.
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virtual ssize_t decrypt(
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bool secure,
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const uint8_t key[16],
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const uint8_t iv[16],
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Mode mode,
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const void *srcPtr,
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const SubSample *subSamples, size_t numSubSamples,
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void *dstPtr,
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AString *errorDetailMsg) = 0;
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private:
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CryptoPlugin(const CryptoPlugin &);
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CryptoPlugin &operator=(const CryptoPlugin &);
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};
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} // namespace android
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extern "C" {
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extern android::CryptoFactory *createCryptoFactory();
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}
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#endif // CRYPTO_API_H_
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