Implemented FixedEncryptorSource.
FixedEncryptorSource takes hardcoded key id and content key. Implemented an AES Encryptor using OpenSSL. Change-Id: I59ba9a41fc0f40925d697045dd1b147b7351c2f9
This commit is contained in:
Kongqun Yang
parent
855ab753c0
commit
e9b77add23
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// Copyright (c) 2013 Google Inc. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "media/base/aes_encryptor.h"
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#include <openssl/aes.h>
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#include "base/logging.h"
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#include "base/rand_util.h"
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namespace {
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// Increment an 8-byte counter by 1. Return true if overflowed.
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bool Increment64(uint8* counter) {
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DCHECK(counter);
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for (int i = 7; i >= 0; --i)
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if (++counter[i] != 0)
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return false;
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return true;
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}
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// According to ISO/IEC FDIS 23001-7: CENC spec, IV should be either
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// 64-bit (8-byte) or 128-bit (16-byte).
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bool IsIvSizeValid(size_t iv_size) { return iv_size == 8 || iv_size == 16; }
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// CENC protection scheme uses 128-bit keys in counter mode.
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const uint32 kCencKeySize = 16;
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} // namespace
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namespace media {
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AesCtrEncryptor::AesCtrEncryptor()
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: block_offset_(0),
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encrypted_counter_(AES_BLOCK_SIZE, 0),
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counter_overflow_(false) {
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COMPILE_ASSERT(AES_BLOCK_SIZE == kCencKeySize,
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cenc_key_size_should_be_the_same_as_aes_block_size);
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}
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AesCtrEncryptor::~AesCtrEncryptor() {}
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bool AesCtrEncryptor::InitializeWithRandomIv(const std::vector<uint8>& key,
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uint8 iv_size) {
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CHECK(IsIvSizeValid(iv_size));
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// TODO(kqyang): should we use RAND_bytes provided by openssl instead?
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std::vector<uint8> iv(iv_size, 0);
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base::RandBytes(&iv[0], iv_size);
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return InitializeWithIv(key, iv);
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}
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bool AesCtrEncryptor::InitializeWithIv(const std::vector<uint8>& key,
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const std::vector<uint8>& iv) {
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CHECK_EQ(kCencKeySize, key.size());
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CHECK(IsIvSizeValid(iv.size()));
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aes_key_.reset(new AES_KEY());
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if (AES_set_encrypt_key(&key[0], AES_BLOCK_SIZE * 8, aes_key_.get()) != 0) {
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aes_key_.reset();
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LOG(ERROR) << "Failed to setup encryption key.";
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return false;
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}
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SetIv(iv);
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return true;
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}
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bool AesCtrEncryptor::Encrypt(const uint8* plaintext,
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size_t plaintext_size,
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uint8* ciphertext) {
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DCHECK(plaintext != NULL && plaintext_size > 0 && ciphertext != NULL);
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DCHECK(aes_key_ != NULL);
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for (size_t i = 0; i < plaintext_size; ++i) {
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if (block_offset_ == 0) {
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AES_encrypt(&counter_[0], &encrypted_counter_[0], aes_key_.get());
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// As mentioned in ISO/IEC FDIS 23001-7: CENC spec, of the 16 byte counter
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// block, bytes 8 to 15 (i.e. the least significant bytes) are used as a
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// simple 64 bit unsigned integer that is incremented by one for each
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// subsequent block of sample data processed and is kept in network byte
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// order.
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if (Increment64(&counter_[8]))
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counter_overflow_ = true;
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}
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ciphertext[i] = plaintext[i] ^ encrypted_counter_[block_offset_];
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block_offset_ = (block_offset_ + 1) % AES_BLOCK_SIZE;
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}
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return true;
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}
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void AesCtrEncryptor::UpdateIv() {
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block_offset_ = 0;
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// As recommended in ISO/IEC FDIS 23001-7: CENC spec, for 64-bit (8-byte)
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// IV_Sizes, initialization vectors for subsequent samples can be created by
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// incrementing the initialization vector of the previous sample.
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// For 128-bit (16-byte) IV_Sizes, initialization vectors for subsequent
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// samples should be created by adding the block count of the previous sample
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// to the initialization vector of the previous sample.
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if (iv_.size() == 8) {
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Increment64(&iv_[0]);
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counter_ = iv_;
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counter_.resize(AES_BLOCK_SIZE, 0);
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} else {
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DCHECK_EQ(16, iv_.size());
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// Even though the block counter portion of the counter (bytes 8 to 15) is
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// treated as a 64-bit number, it is recommended that the initialization
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// vector is treated as a 128-bit number when calculating the next
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// initialization vector from the previous one. The block counter portion
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// is already incremented by number of blocks, the other 64 bits of the
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// counter (bytes 0 to 7) is incremented here if the block counter portion
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// has overflowed.
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if (counter_overflow_)
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Increment64(&counter_[0]);
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iv_ = counter_;
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}
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counter_overflow_ = false;
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}
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void AesCtrEncryptor::SetIv(const std::vector<uint8>& iv) {
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CHECK(IsIvSizeValid(iv.size()));
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block_offset_ = 0;
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counter_ = iv_ = iv;
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counter_.resize(AES_BLOCK_SIZE, 0);
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}
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} // namespace
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// Copyright (c) 2013 Google Inc. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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//
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// AES Encryptor implementation using openssl.
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#ifndef MEDIA_BASE_AES_ENCRYPTOR_H_
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#define MEDIA_BASE_AES_ENCRYPTOR_H_
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#include <string>
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#include <vector>
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#include "base/memory/scoped_ptr.h"
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struct aes_key_st;
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typedef struct aes_key_st AES_KEY;
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namespace media {
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class AesCtrEncryptor {
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public:
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AesCtrEncryptor();
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~AesCtrEncryptor();
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// Initialize the encryptor with specified key. A random iv will be generated.
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// |key| size should be 16. |iv_size| should be either 8 or 16.
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// |block_offset_| is set to 0.
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bool InitializeWithRandomIv(const std::vector<uint8>& key, uint8 iv_size);
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// Initialize the encryptor with specified key and iv.
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// |key| size should be 16. |iv| size should be either 8 or 16.
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// |block_offset_| is set to 0.
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bool InitializeWithIv(const std::vector<uint8>& key,
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const std::vector<uint8>& iv);
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// Various forms of encrypt calls. |block_offset_| will be updated according
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// to input plaintext size.
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bool Encrypt(const uint8* plaintext,
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size_t plaintext_size,
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uint8* ciphertext);
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bool Encrypt(const std::vector<uint8>& plaintext,
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std::vector<uint8>* ciphertext) {
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ciphertext->resize(plaintext.size());
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return Encrypt(&plaintext[0], plaintext.size(), &(*ciphertext)[0]);
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}
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bool Encrypt(const std::string& plaintext, std::string* ciphertext) {
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ciphertext->resize(plaintext.size());
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return Encrypt(reinterpret_cast<const uint8*>(plaintext.data()),
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plaintext.size(),
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reinterpret_cast<uint8*>(&(*ciphertext)[0]));
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}
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// For AES CTR, encryption and decryption are identical.
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bool Decrypt(const uint8* ciphertext,
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size_t ciphertext_size,
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uint8* plaintext) {
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return Encrypt(ciphertext, ciphertext_size, plaintext);
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}
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bool Decrypt(const std::vector<uint8>& ciphertext,
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std::vector<uint8>* plaintext) {
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return Encrypt(ciphertext, plaintext);
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}
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bool Decrypt(const std::string& ciphertext, std::string* plaintext) {
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return Encrypt(ciphertext, plaintext);
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}
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// Update IV for next sample. |block_offset_| is reset to 0.
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// As recommended in ISO/IEC FDIS 23001-7: CENC spec,
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// For 64-bit IV size, new_iv = old_iv + 1;
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// For 128-bit IV size, new_iv = old_iv + previous_sample_block_count.
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void UpdateIv();
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// Set IV. |block_offset_| is reset to 0.
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void SetIv(const std::vector<uint8>& iv);
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const std::vector<uint8>& iv() const { return iv_; }
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uint32 block_offset() const { return block_offset_; }
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private:
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// Initialization vector, with size 8 or 16.
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std::vector<uint8> iv_;
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// Current block offset.
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uint32 block_offset_;
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// Openssl AES_KEY.
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scoped_ptr<AES_KEY> aes_key_;
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// Current AES-CTR counter.
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std::vector<uint8> counter_;
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// Encrypted counter.
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std::vector<uint8> encrypted_counter_;
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// Keep track of whether the counter has overflowed.
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bool counter_overflow_;
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DISALLOW_COPY_AND_ASSIGN(AesCtrEncryptor);
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};
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// TODO(kqyang): implement AesCbcEncryptor.
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} // namespace
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#endif // MEDIA_BASE_AES_ENCRYPTOR_H_
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@ -0,0 +1,298 @@
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// Copyright (c) 2013 Google Inc. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "media/base/aes_encryptor.h"
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#include "base/logging.h"
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#include "base/memory/scoped_ptr.h"
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#include "base/strings/string_number_conversions.h"
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#include "testing/gtest/include/gtest/gtest.h"
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namespace {
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const uint32 kAesBlockSize = 16;
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// From NIST SP 800-38a test case: - F.5.1 CTR-AES128.Encrypt
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// http://csrc.nist.gov/publications/nistpubs/800-38a/sp800-38a.pdf
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const uint8 kAesCtrKey[] = {0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6,
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0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c};
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const uint8 kAesCtrIv[] = {0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
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0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff};
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const uint8 kAesCtrPlaintext[] = {
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// Block #1
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0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96,
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0xe9, 0x3d, 0x7e, 0x11, 0x73, 0x93, 0x17, 0x2a,
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// Block #2
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0xae, 0x2d, 0x8a, 0x57, 0x1e, 0x03, 0xac, 0x9c,
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0x9e, 0xb7, 0x6f, 0xac, 0x45, 0xaf, 0x8e, 0x51,
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// Block #3
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0x30, 0xc8, 0x1c, 0x46, 0xa3, 0x5c, 0xe4, 0x11,
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0xe5, 0xfb, 0xc1, 0x19, 0x1a, 0x0a, 0x52, 0xef,
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// Block #4
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0xf6, 0x9f, 0x24, 0x45, 0xdf, 0x4f, 0x9b, 0x17,
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0xad, 0x2b, 0x41, 0x7b, 0xe6, 0x6c, 0x37, 0x10};
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const uint8 kAesCtrCiphertext[] = {
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// Block #1
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0x87, 0x4d, 0x61, 0x91, 0xb6, 0x20, 0xe3, 0x26,
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0x1b, 0xef, 0x68, 0x64, 0x99, 0x0d, 0xb6, 0xce,
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// Block #2
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0x98, 0x06, 0xf6, 0x6b, 0x79, 0x70, 0xfd, 0xff,
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0x86, 0x17, 0x18, 0x7b, 0xb9, 0xff, 0xfd, 0xff,
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// Block #3
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0x5a, 0xe4, 0xdf, 0x3e, 0xdb, 0xd5, 0xd3, 0x5e,
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0x5b, 0x4f, 0x09, 0x02, 0x0d, 0xb0, 0x3e, 0xab,
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// Block #4
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0x1e, 0x03, 0x1d, 0xda, 0x2f, 0xbe, 0x03, 0xd1,
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0x79, 0x21, 0x70, 0xa0, 0xf3, 0x00, 0x9c, 0xee};
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// Subsample test cases.
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struct SubsampleTestCase {
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const uint8* subsample_sizes;
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uint32 subsample_count;
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};
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const uint8 kSubsampleTest1[] = {64};
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const uint8 kSubsampleTest2[] = {13, 51};
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const uint8 kSubsampleTest3[] = {52, 12};
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const uint8 kSubsampleTest4[] = {16, 48};
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const uint8 kSubsampleTest5[] = {3, 16, 45};
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const uint8 kSubsampleTest6[] = {18, 16, 34};
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const uint8 kSubsampleTest7[] = {8, 16, 2, 38};
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const uint8 kSubsampleTest8[] = {10, 1, 33, 20};
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const uint8 kSubsampleTest9[] = {7, 19, 6, 32};
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const uint8 kSubsampleTest10[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 9};
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const SubsampleTestCase kSubsampleTestCases[] = {
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{kSubsampleTest1, arraysize(kSubsampleTest1)},
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{kSubsampleTest2, arraysize(kSubsampleTest2)},
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{kSubsampleTest3, arraysize(kSubsampleTest3)},
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{kSubsampleTest4, arraysize(kSubsampleTest4)},
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{kSubsampleTest5, arraysize(kSubsampleTest5)},
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{kSubsampleTest6, arraysize(kSubsampleTest6)},
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{kSubsampleTest7, arraysize(kSubsampleTest7)},
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{kSubsampleTest8, arraysize(kSubsampleTest8)},
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{kSubsampleTest9, arraysize(kSubsampleTest9)},
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{kSubsampleTest10, arraysize(kSubsampleTest10)}, };
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// IV test values.
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const uint32 kTextSizeInBytes = 60; // 3 full blocks + 1 partial block.
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const uint8 kIv128Zero[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
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const uint8 kIv128Two[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2};
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const uint8 kIv128Four[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4};
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const uint8 kIv128Max64[] = {0, 0, 0, 0, 0, 0, 0, 0,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
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const uint8 kIv128OneAndThree[] = {0, 0, 0, 0, 0, 0, 0, 1,
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0, 0, 0, 0, 0, 0, 0, 3};
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const uint8 kIv128MaxMinusOne[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xfe};
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const uint8 kIv64Zero[] = {0, 0, 0, 0, 0, 0, 0, 0};
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const uint8 kIv64One[] = {0, 0, 0, 0, 0, 0, 0, 1};
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const uint8 kIv64MaxMinusOne[] = {0xff, 0xff, 0xff, 0xff,
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0xff, 0xff, 0xff, 0xfe};
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const uint8 kIv64Max[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
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struct IvTestCase {
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const uint8* iv_test;
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uint32 iv_size;
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const uint8* iv_expected;
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};
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// As recommended in ISO/IEC FDIS 23001-7: CENC spec,
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// For 64-bit (8-byte) IV_Sizes, initialization vectors for subsequent samples
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// can be created by incrementing the initialization vector of the previous
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// sample. For 128-bit (16-byte) IV_Sizes, initialization vectors for subsequent
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// samples should be created by adding the block count of the previous sample to
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// the initialization vector of the previous sample.
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const IvTestCase kIvTestCases[] = {
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{kIv128Zero, arraysize(kIv128Zero), kIv128Four},
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{kIv128Max64, arraysize(kIv128Max64), kIv128OneAndThree},
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{kIv128MaxMinusOne, arraysize(kIv128MaxMinusOne), kIv128Two},
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{kIv64Zero, arraysize(kIv64Zero), kIv64One},
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{kIv64MaxMinusOne, arraysize(kIv64MaxMinusOne), kIv64Max},
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{kIv64Max, arraysize(kIv64Max), kIv64Zero}, };
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// We support AES 128, i.e. 16 bytes key only.
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const uint8 kInvalidKey[] = {0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2,
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0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, };
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// We support Iv of size 8 or 16 only as defined in CENC spec.
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const uint8 kInvalidIv[] = {0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
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0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, };
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} // namespace
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namespace media {
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class AesEncryptorTest : public testing::Test {
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public:
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virtual void SetUp() {
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key_.assign(kAesCtrKey, kAesCtrKey + arraysize(kAesCtrKey));
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iv_.assign(kAesCtrIv, kAesCtrIv + arraysize(kAesCtrIv));
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plaintext_.assign(kAesCtrPlaintext,
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kAesCtrPlaintext + arraysize(kAesCtrPlaintext));
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ciphertext_.assign(kAesCtrCiphertext,
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kAesCtrCiphertext + arraysize(kAesCtrCiphertext));
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ASSERT_TRUE(encryptor_.InitializeWithIv(key_, iv_));
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}
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protected:
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std::vector<uint8> key_;
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std::vector<uint8> iv_;
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std::vector<uint8> plaintext_;
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std::vector<uint8> ciphertext_;
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AesCtrEncryptor encryptor_;
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};
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TEST_F(AesEncryptorTest, NistTestCase) {
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std::vector<uint8> encrypted;
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EXPECT_TRUE(encryptor_.Encrypt(plaintext_, &encrypted));
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EXPECT_EQ(ciphertext_, encrypted);
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encryptor_.SetIv(iv_);
|
||||
std::vector<uint8> decrypted;
|
||||
EXPECT_TRUE(encryptor_.Decrypt(encrypted, &decrypted));
|
||||
EXPECT_EQ(plaintext_, decrypted);
|
||||
}
|
||||
|
||||
TEST_F(AesEncryptorTest, NistTestCaseInplaceEncryptionDecryption) {
|
||||
std::vector<uint8> buffer = plaintext_;
|
||||
EXPECT_TRUE(encryptor_.Encrypt(&buffer[0], buffer.size(), &buffer[0]));
|
||||
EXPECT_EQ(ciphertext_, buffer);
|
||||
|
||||
encryptor_.SetIv(iv_);
|
||||
EXPECT_TRUE(encryptor_.Decrypt(&buffer[0], buffer.size(), &buffer[0]));
|
||||
EXPECT_EQ(plaintext_, buffer);
|
||||
}
|
||||
|
||||
TEST_F(AesEncryptorTest, EncryptDecryptString) {
|
||||
static const char kPlaintext[] = "normal plaintext of random length";
|
||||
static const char kExpectedCiphertextInHex[] =
|
||||
"82E3AD1EF90C5CC09EB37F1B9EFBD99016441A1C15123F0777CD57BB993E14DA02";
|
||||
|
||||
std::string ciphertext;
|
||||
EXPECT_TRUE(encryptor_.Encrypt(kPlaintext, &ciphertext));
|
||||
EXPECT_EQ(kExpectedCiphertextInHex,
|
||||
base::HexEncode(ciphertext.data(), ciphertext.size()));
|
||||
|
||||
std::string decrypted;
|
||||
encryptor_.SetIv(iv_);
|
||||
EXPECT_TRUE(encryptor_.Decrypt(ciphertext, &decrypted));
|
||||
EXPECT_EQ(kPlaintext, decrypted);
|
||||
}
|
||||
|
||||
TEST_F(AesEncryptorTest, 128BitIVBoundaryCaseEncryption) {
|
||||
// There are four blocks of text in |plaintext_|. The first block should be
|
||||
// encrypted with IV = kIv128Max64, the subsequent blocks should be encrypted
|
||||
// with iv 0 to 3.
|
||||
std::vector<uint8> iv_max64(kIv128Max64,
|
||||
kIv128Max64 + arraysize(kIv128Max64));
|
||||
ASSERT_TRUE(encryptor_.InitializeWithIv(key_, iv_max64));
|
||||
std::vector<uint8> encrypted;
|
||||
EXPECT_TRUE(encryptor_.Encrypt(plaintext_, &encrypted));
|
||||
|
||||
std::vector<uint8> iv_one_and_three(
|
||||
kIv128OneAndThree, kIv128OneAndThree + arraysize(kIv128OneAndThree));
|
||||
encryptor_.UpdateIv();
|
||||
EXPECT_EQ(iv_one_and_three, encryptor_.iv());
|
||||
|
||||
ASSERT_TRUE(encryptor_.InitializeWithIv(key_, iv_max64));
|
||||
std::vector<uint8> encrypted_verify(plaintext_.size(), 0);
|
||||
EXPECT_TRUE(
|
||||
encryptor_.Encrypt(&plaintext_[0], kAesBlockSize, &encrypted_verify[0]));
|
||||
std::vector<uint8> iv_zero(kIv128Zero, kIv128Zero + arraysize(kIv128Zero));
|
||||
ASSERT_TRUE(encryptor_.InitializeWithIv(key_, iv_zero));
|
||||
EXPECT_TRUE(encryptor_.Encrypt(&plaintext_[kAesBlockSize],
|
||||
kAesBlockSize * 3,
|
||||
&encrypted_verify[kAesBlockSize]));
|
||||
EXPECT_EQ(encrypted, encrypted_verify);
|
||||
}
|
||||
|
||||
TEST_F(AesEncryptorTest, InitWithRandomIv) {
|
||||
const uint8 kIvSize = 8;
|
||||
ASSERT_TRUE(encryptor_.InitializeWithRandomIv(key_, kIvSize));
|
||||
ASSERT_EQ(kIvSize, encryptor_.iv().size());
|
||||
LOG(INFO) << "Random IV: " << base::HexEncode(&encryptor_.iv()[0],
|
||||
encryptor_.iv().size());
|
||||
}
|
||||
|
||||
TEST_F(AesEncryptorTest, UnsupportedKeySize) {
|
||||
std::vector<uint8> key(kInvalidKey, kInvalidKey + arraysize(kInvalidKey));
|
||||
ASSERT_DEATH(encryptor_.InitializeWithIv(key, iv_), "");
|
||||
}
|
||||
|
||||
TEST_F(AesEncryptorTest, UnsupportedIV) {
|
||||
std::vector<uint8> iv(kInvalidIv, kInvalidIv + arraysize(kInvalidIv));
|
||||
ASSERT_DEATH(encryptor_.InitializeWithIv(key_, iv), "");
|
||||
}
|
||||
|
||||
TEST_F(AesEncryptorTest, IncorrectIvSize) {
|
||||
ASSERT_DEATH(encryptor_.InitializeWithRandomIv(key_, 15), "");
|
||||
}
|
||||
|
||||
class AesCtrEncryptorSubsampleTest
|
||||
: public AesEncryptorTest,
|
||||
public ::testing::WithParamInterface<SubsampleTestCase> {};
|
||||
|
||||
TEST_P(AesCtrEncryptorSubsampleTest, NistTestCaseSubsamples) {
|
||||
const SubsampleTestCase* test_case = &GetParam();
|
||||
|
||||
std::vector<uint8> encrypted(plaintext_.size(), 0);
|
||||
for (uint32 i = 0, offset = 0; i < test_case->subsample_count; ++i) {
|
||||
uint32 len = test_case->subsample_sizes[i];
|
||||
EXPECT_TRUE(
|
||||
encryptor_.Encrypt(&plaintext_[offset], len, &encrypted[offset]));
|
||||
offset += len;
|
||||
EXPECT_EQ(offset % kAesBlockSize, encryptor_.block_offset());
|
||||
}
|
||||
EXPECT_EQ(ciphertext_, encrypted);
|
||||
|
||||
encryptor_.SetIv(iv_);
|
||||
std::vector<uint8> decrypted(encrypted.size(), 0);
|
||||
for (uint32 i = 0, offset = 0; i < test_case->subsample_count; ++i) {
|
||||
uint32 len = test_case->subsample_sizes[i];
|
||||
EXPECT_TRUE(
|
||||
encryptor_.Decrypt(&encrypted[offset], len, &decrypted[offset]));
|
||||
offset += len;
|
||||
EXPECT_EQ(offset % kAesBlockSize, encryptor_.block_offset());
|
||||
}
|
||||
EXPECT_EQ(plaintext_, decrypted);
|
||||
}
|
||||
|
||||
INSTANTIATE_TEST_CASE_P(SubsampleTestCases,
|
||||
AesCtrEncryptorSubsampleTest,
|
||||
::testing::ValuesIn(kSubsampleTestCases));
|
||||
|
||||
class AesCtrEncryptorIvTest : public ::testing::TestWithParam<IvTestCase> {};
|
||||
|
||||
TEST_P(AesCtrEncryptorIvTest, IvTest) {
|
||||
// Some dummy key and plaintext.
|
||||
std::vector<uint8> key(16, 1);
|
||||
std::vector<uint8> plaintext(kTextSizeInBytes, 3);
|
||||
|
||||
std::vector<uint8> iv_test(GetParam().iv_test,
|
||||
GetParam().iv_test + GetParam().iv_size);
|
||||
std::vector<uint8> iv_expected(GetParam().iv_expected,
|
||||
GetParam().iv_expected + GetParam().iv_size);
|
||||
|
||||
AesCtrEncryptor encryptor;
|
||||
ASSERT_TRUE(encryptor.InitializeWithIv(key, iv_test));
|
||||
|
||||
std::vector<uint8> encrypted;
|
||||
EXPECT_TRUE(encryptor.Encrypt(plaintext, &encrypted));
|
||||
encryptor.UpdateIv();
|
||||
EXPECT_EQ(iv_expected, encryptor.iv());
|
||||
}
|
||||
|
||||
INSTANTIATE_TEST_CASE_P(IvTestCases,
|
||||
AesCtrEncryptorIvTest,
|
||||
::testing::ValuesIn(kIvTestCases));
|
||||
|
||||
} // namespace media
|
||||
|
|
@ -0,0 +1,22 @@
|
|||
// Copyright (c) 2013 Google Inc. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style license that can be
|
||||
// found in the LICENSE file.
|
||||
|
||||
#include "media/base/encryptor_source.h"
|
||||
|
||||
namespace {
|
||||
const char kWidevineSystemId[] = {0xed, 0xef, 0x8b, 0xa9, 0x79, 0xd6,
|
||||
0x4a, 0xce, 0xa3, 0xc8, 0x27, 0xdc,
|
||||
0xd5, 0x1d, 0x21, 0xed};
|
||||
} // namespace
|
||||
|
||||
namespace media {
|
||||
|
||||
EncryptorSource::EncryptorSource()
|
||||
: key_system_id_(kWidevineSystemId,
|
||||
kWidevineSystemId + arraysize(kWidevineSystemId)),
|
||||
clear_milliseconds_(0) {}
|
||||
|
||||
EncryptorSource::~EncryptorSource() {}
|
||||
|
||||
} // namespace media
|
||||
|
|
@ -7,23 +7,57 @@
|
|||
#ifndef MEDIA_BASE_ENCRYPTOR_SOURCE_H_
|
||||
#define MEDIA_BASE_ENCRYPTOR_SOURCE_H_
|
||||
|
||||
#include <vector>
|
||||
|
||||
#include "base/memory/scoped_ptr.h"
|
||||
#include "media/base/container_names.h"
|
||||
#include "media/base/aes_encryptor.h"
|
||||
#include "media/base/status.h"
|
||||
|
||||
namespace media {
|
||||
|
||||
class EncryptorSource {
|
||||
public:
|
||||
EncryptorSource() {}
|
||||
virtual ~EncryptorSource() {}
|
||||
EncryptorSource();
|
||||
virtual ~EncryptorSource();
|
||||
|
||||
virtual Status Init() = 0;
|
||||
virtual Status Initialize() = 0;
|
||||
|
||||
// Refreshes the encryptor. NOP except for key rotation encryptor source.
|
||||
// TODO(kqyang): Do we need to pass in duration or fragment number?
|
||||
virtual void RefreshEncryptor() {}
|
||||
|
||||
// EncryptorSource retains the ownership of |encryptor_|.
|
||||
AesCtrEncryptor* encryptor() { return encryptor_.get(); }
|
||||
const std::vector<uint8>& key_id() const { return key_id_; }
|
||||
const std::vector<uint8>& key() const { return key_; }
|
||||
const std::vector<uint8>& pssh() const { return pssh_; }
|
||||
uint32 clear_milliseconds() const { return clear_milliseconds_; }
|
||||
const std::vector<uint8>& key_system_id() const { return key_system_id_; }
|
||||
|
||||
protected:
|
||||
// EncryptorSource takes ownership of |encryptor|.
|
||||
void set_encryptor(scoped_ptr<AesCtrEncryptor> encryptor) {
|
||||
encryptor_ = encryptor.Pass();
|
||||
}
|
||||
void set_key_id(const std::vector<uint8>& key_id) { key_id_ = key_id; }
|
||||
void set_key(const std::vector<uint8>& key) { key_ = key; }
|
||||
void set_pssh(const std::vector<uint8>& pssh) { pssh_ = pssh; }
|
||||
void set_clear_milliseconds(uint32 clear_milliseconds) {
|
||||
clear_milliseconds_ = clear_milliseconds;
|
||||
}
|
||||
|
||||
private:
|
||||
scoped_ptr<AesCtrEncryptor> encryptor_;
|
||||
std::vector<uint8> key_id_;
|
||||
std::vector<uint8> key_;
|
||||
std::vector<uint8> pssh_;
|
||||
// The first |clear_milliseconds_| of the result media should be in the clear
|
||||
// text, i.e. should not be encrypted.
|
||||
uint32 clear_milliseconds_;
|
||||
const std::vector<uint8> key_system_id_;
|
||||
|
||||
DISALLOW_COPY_AND_ASSIGN(EncryptorSource);
|
||||
};
|
||||
|
||||
}
|
||||
|
||||
#endif // MEDIA_BASE_ENCRYPTOR_SOURCE_H_
|
||||
|
|
|
|||
|
|
@ -0,0 +1,60 @@
|
|||
// Copyright (c) 2013 Google Inc. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style license that can be
|
||||
// found in the LICENSE file.
|
||||
|
||||
#include "media/base/fixed_encryptor_source.h"
|
||||
|
||||
#include "base/logging.h"
|
||||
#include "base/strings/string_number_conversions.h"
|
||||
#include "media/base/aes_encryptor.h"
|
||||
|
||||
namespace {
|
||||
// The size of generated IV for this encryptor source.
|
||||
const uint8 kIvSize = 8;
|
||||
} // namespace
|
||||
|
||||
namespace media {
|
||||
|
||||
FixedEncryptorSource::FixedEncryptorSource(const std::string& key_id_hex,
|
||||
const std::string& key_hex,
|
||||
const std::string& pssh_hex,
|
||||
uint32 clear_milliseconds)
|
||||
: key_id_hex_(key_id_hex),
|
||||
key_hex_(key_hex),
|
||||
pssh_hex_(pssh_hex) {
|
||||
set_clear_milliseconds(clear_milliseconds);
|
||||
}
|
||||
|
||||
FixedEncryptorSource::~FixedEncryptorSource() {}
|
||||
|
||||
Status FixedEncryptorSource::Initialize() {
|
||||
std::vector<uint8> key_id;
|
||||
if (!base::HexStringToBytes(key_id_hex_, &key_id)) {
|
||||
LOG(ERROR) << "Cannot parse key_id_hex " << key_id_hex_;
|
||||
return Status(error::INVALID_ARGUMENT, "Cannot parse input key_id_hex.");
|
||||
}
|
||||
|
||||
std::vector<uint8> key;
|
||||
if (!base::HexStringToBytes(key_hex_, &key)) {
|
||||
LOG(ERROR) << "Cannot parse key_hex " << key_hex_;
|
||||
return Status(error::INVALID_ARGUMENT, "Cannot parse input key_hex.");
|
||||
}
|
||||
|
||||
std::vector<uint8> pssh;
|
||||
if (!base::HexStringToBytes(pssh_hex_, &pssh)) {
|
||||
LOG(ERROR) << "Cannot parse pssh_hex " << pssh_hex_;
|
||||
return Status(error::INVALID_ARGUMENT, "Cannot parse input pssh_hex.");
|
||||
}
|
||||
|
||||
scoped_ptr<AesCtrEncryptor> encryptor(new AesCtrEncryptor());
|
||||
if (!encryptor->InitializeWithRandomIv(key, kIvSize))
|
||||
return Status(error::UNKNOWN, "Failed to initialize the encryptor.");
|
||||
|
||||
set_encryptor(encryptor.Pass());
|
||||
set_key_id(key_id);
|
||||
set_key(key);
|
||||
set_pssh(pssh);
|
||||
return Status::OK;
|
||||
}
|
||||
|
||||
} // namespace media
|
||||
|
|
@ -0,0 +1,35 @@
|
|||
// Copyright (c) 2013 Google Inc. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style license that can be
|
||||
// found in the LICENSE file.
|
||||
//
|
||||
// Defines a fixed encryptor source with keys provided by user.
|
||||
|
||||
#ifndef MEDIA_BASE_FIXED_ENCRYPTOR_SOURCE_H_
|
||||
#define MEDIA_BASE_FIXED_ENCRYPTOR_SOURCE_H_
|
||||
|
||||
#include "media/base/encryptor_source.h"
|
||||
|
||||
namespace media {
|
||||
|
||||
class FixedEncryptorSource : public EncryptorSource {
|
||||
public:
|
||||
FixedEncryptorSource(const std::string& key_id_hex,
|
||||
const std::string& key_hex,
|
||||
const std::string& pssh_hex,
|
||||
uint32 clear_milliseconds);
|
||||
virtual ~FixedEncryptorSource();
|
||||
|
||||
// EncryptorSource implementation.
|
||||
virtual Status Initialize() OVERRIDE;
|
||||
|
||||
private:
|
||||
std::string key_id_hex_;
|
||||
std::string key_hex_;
|
||||
std::string pssh_hex_;
|
||||
|
||||
DISALLOW_COPY_AND_ASSIGN(FixedEncryptorSource);
|
||||
};
|
||||
|
||||
} // namespace media
|
||||
|
||||
#endif // MEDIA_BASE_FIXED_ENCRYPTOR_SOURCE_H_
|
||||
Loading…
Reference in New Issue