2016-03-18 05:18:31 +00:00
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< li class = "navelem" > < a class = "el" href = "../../dir_39dc0668bd5a501998f94e8b4e546c71.html" > media< / a > < / li > < li class = "navelem" > < a class = "el" href = "../../dir_c6ada2450b25ab5438a4dba6c9b890af.html" > base< / a > < / li > < / ul >
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< div class = "title" > aes_decryptor.cc< / div > < / div >
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< div class = "contents" >
< div class = "fragment" > < div class = "line" > < a name = "l00001" > < / a > < span class = "lineno" > 1< / span >   < span class = "comment" > // Copyright 2016 Google Inc. All rights reserved.< / span > < / div >
< div class = "line" > < a name = "l00002" > < / a > < span class = "lineno" > 2< / span >   < span class = "comment" > //< / span > < / div >
< div class = "line" > < a name = "l00003" > < / a > < span class = "lineno" > 3< / span >   < span class = "comment" > // Use of this source code is governed by a BSD-style< / span > < / div >
< div class = "line" > < a name = "l00004" > < / a > < span class = "lineno" > 4< / span >   < span class = "comment" > // license that can be found in the LICENSE file or at< / span > < / div >
< div class = "line" > < a name = "l00005" > < / a > < span class = "lineno" > 5< / span >   < span class = "comment" > // https://developers.google.com/open-source/licenses/bsd< / span > < / div >
< div class = "line" > < a name = "l00006" > < / a > < span class = "lineno" > 6< / span >   < / div >
< div class = "line" > < a name = "l00007" > < / a > < span class = "lineno" > 7< / span >   < span class = "preprocessor" > #include " packager/media/base/aes_decryptor.h" < / span > < / div >
< div class = "line" > < a name = "l00008" > < / a > < span class = "lineno" > 8< / span >   < / div >
< div class = "line" > < a name = "l00009" > < / a > < span class = "lineno" > 9< / span >   < span class = "preprocessor" > #include < openssl/aes.h> < / span > < / div >
< div class = "line" > < a name = "l00010" > < / a > < span class = "lineno" > 10< / span >   < span class = "preprocessor" > #include < openssl/err.h> < / span > < / div >
< div class = "line" > < a name = "l00011" > < / a > < span class = "lineno" > 11< / span >   < span class = "preprocessor" > #include < openssl/rand.h> < / span > < / div >
< div class = "line" > < a name = "l00012" > < / a > < span class = "lineno" > 12< / span >   < / div >
< div class = "line" > < a name = "l00013" > < / a > < span class = "lineno" > 13< / span >   < span class = "preprocessor" > #include " packager/base/logging.h" < / span > < / div >
< div class = "line" > < a name = "l00014" > < / a > < span class = "lineno" > 14< / span >   < / div >
< div class = "line" > < a name = "l00015" > < / a > < span class = "lineno" > 15< / span >   < span class = "keyword" > namespace < / span > {< / div >
< div class = "line" > < a name = "l00016" > < / a > < span class = "lineno" > 16< / span >   < / div >
< div class = "line" > < a name = "l00017" > < / a > < span class = "lineno" > 17< / span >   < span class = "comment" > // AES defines three key sizes: 128, 192 and 256 bits.< / span > < / div >
< div class = "line" > < a name = "l00018" > < / a > < span class = "lineno" > 18< / span >   < span class = "keywordtype" > bool< / span > IsKeySizeValidForAes(< span class = "keywordtype" > size_t< / span > key_size) {< / div >
< div class = "line" > < a name = "l00019" > < / a > < span class = "lineno" > 19< / span >   < span class = "keywordflow" > return< / span > key_size == 16 || key_size == 24 || key_size == 32;< / div >
< div class = "line" > < a name = "l00020" > < / a > < span class = "lineno" > 20< / span >   }< / div >
< div class = "line" > < a name = "l00021" > < / a > < span class = "lineno" > 21< / span >   < / div >
< div class = "line" > < a name = "l00022" > < / a > < span class = "lineno" > 22< / span >   } < span class = "comment" > // namespace< / span > < / div >
< div class = "line" > < a name = "l00023" > < / a > < span class = "lineno" > 23< / span >   < / div >
< div class = "line" > < a name = "l00024" > < / a > < span class = "lineno" > 24< / span >   < span class = "keyword" > namespace < / span > edash_packager {< / div >
< div class = "line" > < a name = "l00025" > < / a > < span class = "lineno" > 25< / span >   < span class = "keyword" > namespace < / span > media {< / div >
< div class = "line" > < a name = "l00026" > < / a > < span class = "lineno" > 26< / span >   < / div >
< div class = "line" > < a name = "l00027" > < / a > < span class = "lineno" > 27< / span >   AesDecryptor::AesDecryptor() {}< / div >
< div class = "line" > < a name = "l00028" > < / a > < span class = "lineno" > 28< / span >   AesDecryptor::~AesDecryptor() {}< / div >
< div class = "line" > < a name = "l00029" > < / a > < span class = "lineno" > 29< / span >   < / div >
< div class = "line" > < a name = "l00030" > < / a > < span class = "lineno" > 30< / span >   AesCtrDecryptor::AesCtrDecryptor() {}< / div >
< div class = "line" > < a name = "l00031" > < / a > < span class = "lineno" > 31< / span >   < / div >
< div class = "line" > < a name = "l00032" > < / a > < span class = "lineno" > 32< / span >   AesCtrDecryptor::~AesCtrDecryptor() {}< / div >
< div class = "line" > < a name = "l00033" > < / a > < span class = "lineno" > 33< / span >   < / div >
< div class = "line" > < a name = "l00034" > < / a > < span class = "lineno" > 34< / span >   < span class = "keywordtype" > bool< / span > AesCtrDecryptor::InitializeWithIv(< span class = "keyword" > const< / span > std::vector< uint8_t> & key,< / div >
< div class = "line" > < a name = "l00035" > < / a > < span class = "lineno" > 35< / span >   < span class = "keyword" > const< / span > std::vector< uint8_t> & iv) {< / div >
< div class = "line" > < a name = "l00036" > < / a > < span class = "lineno" > 36< / span >   encryptor_.reset(< span class = "keyword" > new< / span > AesCtrEncryptor);< / div >
< div class = "line" > < a name = "l00037" > < / a > < span class = "lineno" > 37< / span >   < span class = "keywordflow" > return< / span > encryptor_-> InitializeWithIv(key, iv);< / div >
< div class = "line" > < a name = "l00038" > < / a > < span class = "lineno" > 38< / span >   }< / div >
< div class = "line" > < a name = "l00039" > < / a > < span class = "lineno" > 39< / span >   < / div >
< div class = "line" > < a name = "l00040" > < / a > < span class = "lineno" > 40< / span >   < span class = "comment" > // For AES CTR, encryption and decryption are identical.< / span > < / div >
< div class = "line" > < a name = "l00041" > < / a > < span class = "lineno" > 41< / span >   < span class = "keywordtype" > bool< / span > AesCtrDecryptor::Decrypt(< span class = "keyword" > const< / span > uint8_t* ciphertext,< / div >
< div class = "line" > < a name = "l00042" > < / a > < span class = "lineno" > 42< / span >   < span class = "keywordtype" > size_t< / span > ciphertext_size,< / div >
< div class = "line" > < a name = "l00043" > < / a > < span class = "lineno" > 43< / span >   uint8_t* plaintext) {< / div >
< div class = "line" > < a name = "l00044" > < / a > < span class = "lineno" > 44< / span >   DCHECK(encryptor_);< / div >
< div class = "line" > < a name = "l00045" > < / a > < span class = "lineno" > 45< / span >   < span class = "keywordflow" > return< / span > encryptor_-> EncryptData(ciphertext, ciphertext_size, plaintext);< / div >
< div class = "line" > < a name = "l00046" > < / a > < span class = "lineno" > 46< / span >   }< / div >
< div class = "line" > < a name = "l00047" > < / a > < span class = "lineno" > 47< / span >   < / div >
< div class = "line" > < a name = "l00048" > < / a > < span class = "lineno" > 48< / span >   < span class = "keywordtype" > bool< / span > AesCtrDecryptor::Decrypt(< span class = "keyword" > const< / span > std::vector< uint8_t> & ciphertext,< / div >
< div class = "line" > < a name = "l00049" > < / a > < span class = "lineno" > 49< / span >   std::vector< uint8_t> * plaintext) {< / div >
< div class = "line" > < a name = "l00050" > < / a > < span class = "lineno" > 50< / span >   DCHECK(encryptor_);< / div >
< div class = "line" > < a name = "l00051" > < / a > < span class = "lineno" > 51< / span >   < span class = "keywordflow" > return< / span > encryptor_-> Encrypt(ciphertext, plaintext);< / div >
< div class = "line" > < a name = "l00052" > < / a > < span class = "lineno" > 52< / span >   }< / div >
< div class = "line" > < a name = "l00053" > < / a > < span class = "lineno" > 53< / span >   < / div >
< div class = "line" > < a name = "l00054" > < / a > < span class = "lineno" > 54< / span >   < span class = "keywordtype" > bool< / span > AesCtrDecryptor::Decrypt(< span class = "keyword" > const< / span > std::string& ciphertext,< / div >
< div class = "line" > < a name = "l00055" > < / a > < span class = "lineno" > 55< / span >   std::string* plaintext) {< / div >
< div class = "line" > < a name = "l00056" > < / a > < span class = "lineno" > 56< / span >   DCHECK(encryptor_);< / div >
< div class = "line" > < a name = "l00057" > < / a > < span class = "lineno" > 57< / span >   < span class = "keywordflow" > return< / span > encryptor_-> Encrypt(ciphertext, plaintext);< / div >
< div class = "line" > < a name = "l00058" > < / a > < span class = "lineno" > 58< / span >   }< / div >
< div class = "line" > < a name = "l00059" > < / a > < span class = "lineno" > 59< / span >   < / div >
< div class = "line" > < a name = "l00060" > < / a > < span class = "lineno" > < a class = "line" href = "../../df/d06/classedash__packager_1_1media_1_1AesCtrDecryptor.html#ad8a3e36af755f380c62fd1f058ee678b" > 60< / a > < / span >   < span class = "keywordtype" > bool< / span > < a class = "code" href = "../../df/d06/classedash__packager_1_1media_1_1AesCtrDecryptor.html#ad8a3e36af755f380c62fd1f058ee678b" > AesCtrDecryptor::SetIv< / a > (< span class = "keyword" > const< / span > std::vector< uint8_t> & iv) {< / div >
< div class = "line" > < a name = "l00061" > < / a > < span class = "lineno" > 61< / span >   DCHECK(encryptor_);< / div >
< div class = "line" > < a name = "l00062" > < / a > < span class = "lineno" > 62< / span >   < span class = "keywordflow" > return< / span > encryptor_-> SetIv(iv);< / div >
< div class = "line" > < a name = "l00063" > < / a > < span class = "lineno" > 63< / span >   }< / div >
< div class = "line" > < a name = "l00064" > < / a > < span class = "lineno" > 64< / span >   < / div >
< div class = "line" > < a name = "l00065" > < / a > < span class = "lineno" > 65< / span >   AesCbcPkcs5Decryptor::AesCbcPkcs5Decryptor() {}< / div >
< div class = "line" > < a name = "l00066" > < / a > < span class = "lineno" > 66< / span >   AesCbcPkcs5Decryptor::~AesCbcPkcs5Decryptor() {}< / div >
< div class = "line" > < a name = "l00067" > < / a > < span class = "lineno" > 67< / span >   < / div >
< div class = "line" > < a name = "l00068" > < / a > < span class = "lineno" > 68< / span >   < span class = "keywordtype" > bool< / span > AesCbcPkcs5Decryptor::InitializeWithIv(< span class = "keyword" > const< / span > std::vector< uint8_t> & key,< / div >
< div class = "line" > < a name = "l00069" > < / a > < span class = "lineno" > 69< / span >   < span class = "keyword" > const< / span > std::vector< uint8_t> & iv) {< / div >
< div class = "line" > < a name = "l00070" > < / a > < span class = "lineno" > 70< / span >   < span class = "keywordflow" > if< / span > (!IsKeySizeValidForAes(key.size())) {< / div >
< div class = "line" > < a name = "l00071" > < / a > < span class = "lineno" > 71< / span >   LOG(ERROR) < < < span class = "stringliteral" > " Invalid AES key size: " < / span > < < key.size();< / div >
< div class = "line" > < a name = "l00072" > < / a > < span class = "lineno" > 72< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00073" > < / a > < span class = "lineno" > 73< / span >   }< / div >
< div class = "line" > < a name = "l00074" > < / a > < span class = "lineno" > 74< / span >   < span class = "keywordflow" > if< / span > (iv.size() != AES_BLOCK_SIZE) {< / div >
< div class = "line" > < a name = "l00075" > < / a > < span class = "lineno" > 75< / span >   LOG(ERROR) < < < span class = "stringliteral" > " Invalid IV size: " < / span > < < iv.size();< / div >
< div class = "line" > < a name = "l00076" > < / a > < span class = "lineno" > 76< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00077" > < / a > < span class = "lineno" > 77< / span >   }< / div >
< div class = "line" > < a name = "l00078" > < / a > < span class = "lineno" > 78< / span >   < / div >
< div class = "line" > < a name = "l00079" > < / a > < span class = "lineno" > 79< / span >   aes_key_.reset(< span class = "keyword" > new< / span > AES_KEY());< / div >
< div class = "line" > < a name = "l00080" > < / a > < span class = "lineno" > 80< / span >   CHECK_EQ(AES_set_decrypt_key(& key[0], key.size() * 8, aes_key_.get()), 0);< / div >
< div class = "line" > < a name = "l00081" > < / a > < span class = "lineno" > 81< / span >   < / div >
< div class = "line" > < a name = "l00082" > < / a > < span class = "lineno" > 82< / span >   iv_ = iv;< / div >
< div class = "line" > < a name = "l00083" > < / a > < span class = "lineno" > 83< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00084" > < / a > < span class = "lineno" > 84< / span >   }< / div >
< div class = "line" > < a name = "l00085" > < / a > < span class = "lineno" > 85< / span >   < / div >
< div class = "line" > < a name = "l00086" > < / a > < span class = "lineno" > 86< / span >   < span class = "keywordtype" > bool< / span > AesCbcPkcs5Decryptor::Decrypt(< span class = "keyword" > const< / span > uint8_t* ciphertext,< / div >
< div class = "line" > < a name = "l00087" > < / a > < span class = "lineno" > 87< / span >   < span class = "keywordtype" > size_t< / span > ciphertext_size,< / div >
< div class = "line" > < a name = "l00088" > < / a > < span class = "lineno" > 88< / span >   uint8_t* plaintext) {< / div >
< div class = "line" > < a name = "l00089" > < / a > < span class = "lineno" > 89< / span >   NOTIMPLEMENTED();< / div >
< div class = "line" > < a name = "l00090" > < / a > < span class = "lineno" > 90< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00091" > < / a > < span class = "lineno" > 91< / span >   }< / div >
< div class = "line" > < a name = "l00092" > < / a > < span class = "lineno" > 92< / span >   < / div >
< div class = "line" > < a name = "l00093" > < / a > < span class = "lineno" > 93< / span >   < span class = "keywordtype" > bool< / span > AesCbcPkcs5Decryptor::Decrypt(< span class = "keyword" > const< / span > std::vector< uint8_t> & ciphertext,< / div >
< div class = "line" > < a name = "l00094" > < / a > < span class = "lineno" > 94< / span >   std::vector< uint8_t> * plaintext) {< / div >
< div class = "line" > < a name = "l00095" > < / a > < span class = "lineno" > 95< / span >   NOTIMPLEMENTED();< / div >
< div class = "line" > < a name = "l00096" > < / a > < span class = "lineno" > 96< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00097" > < / a > < span class = "lineno" > 97< / span >   }< / div >
< div class = "line" > < a name = "l00098" > < / a > < span class = "lineno" > 98< / span >   < / div >
< div class = "line" > < a name = "l00099" > < / a > < span class = "lineno" > 99< / span >   < span class = "keywordtype" > bool< / span > AesCbcPkcs5Decryptor::Decrypt(< span class = "keyword" > const< / span > std::string& ciphertext,< / div >
< div class = "line" > < a name = "l00100" > < / a > < span class = "lineno" > 100< / span >   std::string* plaintext) {< / div >
< div class = "line" > < a name = "l00101" > < / a > < span class = "lineno" > 101< / span >   < span class = "keywordflow" > if< / span > ((ciphertext.size() % AES_BLOCK_SIZE) != 0) {< / div >
< div class = "line" > < a name = "l00102" > < / a > < span class = "lineno" > 102< / span >   LOG(ERROR) < < < span class = "stringliteral" > " Expecting cipher text size to be multiple of " < / span > < / div >
< div class = "line" > < a name = "l00103" > < / a > < span class = "lineno" > 103< / span >   < < AES_BLOCK_SIZE < < < span class = "stringliteral" > " , got " < / span > < < ciphertext.size();< / div >
< div class = "line" > < a name = "l00104" > < / a > < span class = "lineno" > 104< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00105" > < / a > < span class = "lineno" > 105< / span >   }< / div >
< div class = "line" > < a name = "l00106" > < / a > < span class = "lineno" > 106< / span >   < / div >
< div class = "line" > < a name = "l00107" > < / a > < span class = "lineno" > 107< / span >   DCHECK(plaintext);< / div >
< div class = "line" > < a name = "l00108" > < / a > < span class = "lineno" > 108< / span >   DCHECK(aes_key_);< / div >
< div class = "line" > < a name = "l00109" > < / a > < span class = "lineno" > 109< / span >   < / div >
< div class = "line" > < a name = "l00110" > < / a > < span class = "lineno" > 110< / span >   plaintext-> resize(ciphertext.size());< / div >
< div class = "line" > < a name = "l00111" > < / a > < span class = "lineno" > 111< / span >   AES_cbc_encrypt(reinterpret_cast< const uint8_t*> (ciphertext.data()),< / div >
< div class = "line" > < a name = "l00112" > < / a > < span class = "lineno" > 112< / span >   reinterpret_cast< uint8_t*> (string_as_array(plaintext)),< / div >
< div class = "line" > < a name = "l00113" > < / a > < span class = "lineno" > 113< / span >   ciphertext.size(),< / div >
< div class = "line" > < a name = "l00114" > < / a > < span class = "lineno" > 114< / span >   aes_key_.get(),< / div >
< div class = "line" > < a name = "l00115" > < / a > < span class = "lineno" > 115< / span >   & iv_[0],< / div >
< div class = "line" > < a name = "l00116" > < / a > < span class = "lineno" > 116< / span >   AES_DECRYPT);< / div >
< div class = "line" > < a name = "l00117" > < / a > < span class = "lineno" > 117< / span >   < / div >
< div class = "line" > < a name = "l00118" > < / a > < span class = "lineno" > 118< / span >   < span class = "comment" > // Strip off PKCS5 padding bytes.< / span > < / div >
< div class = "line" > < a name = "l00119" > < / a > < span class = "lineno" > 119< / span >   < span class = "keyword" > const< / span > uint8_t num_padding_bytes = (*plaintext)[plaintext-> size() - 1];< / div >
< div class = "line" > < a name = "l00120" > < / a > < span class = "lineno" > 120< / span >   < span class = "keywordflow" > if< / span > (num_padding_bytes > AES_BLOCK_SIZE) {< / div >
< div class = "line" > < a name = "l00121" > < / a > < span class = "lineno" > 121< / span >   LOG(ERROR) < < < span class = "stringliteral" > " Padding length is too large : " < / span > < / div >
< div class = "line" > < a name = "l00122" > < / a > < span class = "lineno" > 122< / span >   < < < span class = "keyword" > static_cast< < / span > < span class = "keywordtype" > int< / span > < span class = "keyword" > > < / span > (num_padding_bytes);< / div >
< div class = "line" > < a name = "l00123" > < / a > < span class = "lineno" > 123< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00124" > < / a > < span class = "lineno" > 124< / span >   }< / div >
< div class = "line" > < a name = "l00125" > < / a > < span class = "lineno" > 125< / span >   plaintext-> resize(plaintext-> size() - num_padding_bytes);< / div >
< div class = "line" > < a name = "l00126" > < / a > < span class = "lineno" > 126< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00127" > < / a > < span class = "lineno" > 127< / span >   }< / div >
< div class = "line" > < a name = "l00128" > < / a > < span class = "lineno" > 128< / span >   < / div >
< div class = "line" > < a name = "l00129" > < / a > < span class = "lineno" > < a class = "line" href = "../../db/dfe/classedash__packager_1_1media_1_1AesCbcPkcs5Decryptor.html#ae656e1d162064360bb6adfb90bc8edfb" > 129< / a > < / span >   < span class = "keywordtype" > bool< / span > < a class = "code" href = "../../db/dfe/classedash__packager_1_1media_1_1AesCbcPkcs5Decryptor.html#ae656e1d162064360bb6adfb90bc8edfb" > AesCbcPkcs5Decryptor::SetIv< / a > (< span class = "keyword" > const< / span > std::vector< uint8_t> & iv) {< / div >
< div class = "line" > < a name = "l00130" > < / a > < span class = "lineno" > 130< / span >   < span class = "keywordflow" > if< / span > (iv.size() != AES_BLOCK_SIZE) {< / div >
< div class = "line" > < a name = "l00131" > < / a > < span class = "lineno" > 131< / span >   LOG(ERROR) < < < span class = "stringliteral" > " Invalid IV size: " < / span > < < iv.size();< / div >
< div class = "line" > < a name = "l00132" > < / a > < span class = "lineno" > 132< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00133" > < / a > < span class = "lineno" > 133< / span >   }< / div >
< div class = "line" > < a name = "l00134" > < / a > < span class = "lineno" > 134< / span >   < / div >
< div class = "line" > < a name = "l00135" > < / a > < span class = "lineno" > 135< / span >   iv_ = iv;< / div >
< div class = "line" > < a name = "l00136" > < / a > < span class = "lineno" > 136< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00137" > < / a > < span class = "lineno" > 137< / span >   }< / div >
< div class = "line" > < a name = "l00138" > < / a > < span class = "lineno" > 138< / span >   < / div >
< div class = "line" > < a name = "l00139" > < / a > < span class = "lineno" > 139< / span >   AesCbcCtsDecryptor::AesCbcCtsDecryptor() {}< / div >
< div class = "line" > < a name = "l00140" > < / a > < span class = "lineno" > 140< / span >   AesCbcCtsDecryptor::~AesCbcCtsDecryptor() {}< / div >
< div class = "line" > < a name = "l00141" > < / a > < span class = "lineno" > 141< / span >   < / div >
< div class = "line" > < a name = "l00142" > < / a > < span class = "lineno" > 142< / span >   < span class = "keywordtype" > bool< / span > AesCbcCtsDecryptor::InitializeWithIv(< span class = "keyword" > const< / span > std::vector< uint8_t> & key,< / div >
< div class = "line" > < a name = "l00143" > < / a > < span class = "lineno" > 143< / span >   < span class = "keyword" > const< / span > std::vector< uint8_t> & iv) {< / div >
< div class = "line" > < a name = "l00144" > < / a > < span class = "lineno" > 144< / span >   < span class = "keywordflow" > if< / span > (!IsKeySizeValidForAes(key.size())) {< / div >
< div class = "line" > < a name = "l00145" > < / a > < span class = "lineno" > 145< / span >   LOG(ERROR) < < < span class = "stringliteral" > " Invalid AES key size: " < / span > < < key.size();< / div >
< div class = "line" > < a name = "l00146" > < / a > < span class = "lineno" > 146< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00147" > < / a > < span class = "lineno" > 147< / span >   }< / div >
< div class = "line" > < a name = "l00148" > < / a > < span class = "lineno" > 148< / span >   < span class = "keywordflow" > if< / span > (iv.size() != AES_BLOCK_SIZE) {< / div >
< div class = "line" > < a name = "l00149" > < / a > < span class = "lineno" > 149< / span >   LOG(ERROR) < < < span class = "stringliteral" > " Invalid IV size: " < / span > < < iv.size();< / div >
< div class = "line" > < a name = "l00150" > < / a > < span class = "lineno" > 150< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00151" > < / a > < span class = "lineno" > 151< / span >   }< / div >
< div class = "line" > < a name = "l00152" > < / a > < span class = "lineno" > 152< / span >   < / div >
< div class = "line" > < a name = "l00153" > < / a > < span class = "lineno" > 153< / span >   aes_key_.reset(< span class = "keyword" > new< / span > AES_KEY());< / div >
< div class = "line" > < a name = "l00154" > < / a > < span class = "lineno" > 154< / span >   CHECK_EQ(AES_set_decrypt_key(& key[0], key.size() * 8, aes_key_.get()), 0);< / div >
< div class = "line" > < a name = "l00155" > < / a > < span class = "lineno" > 155< / span >   < / div >
< div class = "line" > < a name = "l00156" > < / a > < span class = "lineno" > 156< / span >   iv_ = iv;< / div >
< div class = "line" > < a name = "l00157" > < / a > < span class = "lineno" > 157< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00158" > < / a > < span class = "lineno" > 158< / span >   }< / div >
< div class = "line" > < a name = "l00159" > < / a > < span class = "lineno" > 159< / span >   < / div >
< div class = "line" > < a name = "l00160" > < / a > < span class = "lineno" > 160< / span >   < span class = "keywordtype" > bool< / span > AesCbcCtsDecryptor::Decrypt(< span class = "keyword" > const< / span > uint8_t* ciphertext,< / div >
< div class = "line" > < a name = "l00161" > < / a > < span class = "lineno" > 161< / span >   < span class = "keywordtype" > size_t< / span > ciphertext_size,< / div >
< div class = "line" > < a name = "l00162" > < / a > < span class = "lineno" > 162< / span >   uint8_t* plaintext) {< / div >
< div class = "line" > < a name = "l00163" > < / a > < span class = "lineno" > 163< / span >   DCHECK(ciphertext);< / div >
< div class = "line" > < a name = "l00164" > < / a > < span class = "lineno" > 164< / span >   DCHECK(plaintext);< / div >
< div class = "line" > < a name = "l00165" > < / a > < span class = "lineno" > 165< / span >   < / div >
< div class = "line" > < a name = "l00166" > < / a > < span class = "lineno" > 166< / span >   < span class = "keywordflow" > if< / span > (ciphertext_size < AES_BLOCK_SIZE) {< / div >
< div class = "line" > < a name = "l00167" > < / a > < span class = "lineno" > 167< / span >   < span class = "comment" > // Don' t have a full block, leave unencrypted.< / span > < / div >
< div class = "line" > < a name = "l00168" > < / a > < span class = "lineno" > 168< / span >   memcpy(plaintext, ciphertext, ciphertext_size);< / div >
< div class = "line" > < a name = "l00169" > < / a > < span class = "lineno" > 169< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00170" > < / a > < span class = "lineno" > 170< / span >   }< / div >
< div class = "line" > < a name = "l00171" > < / a > < span class = "lineno" > 171< / span >   < / div >
< div class = "line" > < a name = "l00172" > < / a > < span class = "lineno" > 172< / span >   std::vector< uint8_t> iv(iv_);< / div >
< div class = "line" > < a name = "l00173" > < / a > < span class = "lineno" > 173< / span >   < span class = "keywordtype" > size_t< / span > residual_block_size = ciphertext_size % AES_BLOCK_SIZE;< / div >
< div class = "line" > < a name = "l00174" > < / a > < span class = "lineno" > 174< / span >   < / div >
< div class = "line" > < a name = "l00175" > < / a > < span class = "lineno" > 175< / span >   < span class = "keywordflow" > if< / span > (residual_block_size == 0) {< / div >
< div class = "line" > < a name = "l00176" > < / a > < span class = "lineno" > 176< / span >   < span class = "comment" > // No residual block. No need to do ciphertext stealing.< / span > < / div >
< div class = "line" > < a name = "l00177" > < / a > < span class = "lineno" > 177< / span >   AES_cbc_encrypt(ciphertext,< / div >
< div class = "line" > < a name = "l00178" > < / a > < span class = "lineno" > 178< / span >   plaintext,< / div >
< div class = "line" > < a name = "l00179" > < / a > < span class = "lineno" > 179< / span >   ciphertext_size,< / div >
< div class = "line" > < a name = "l00180" > < / a > < span class = "lineno" > 180< / span >   aes_key_.get(),< / div >
< div class = "line" > < a name = "l00181" > < / a > < span class = "lineno" > 181< / span >   & iv[0],< / div >
< div class = "line" > < a name = "l00182" > < / a > < span class = "lineno" > 182< / span >   AES_DECRYPT);< / div >
< div class = "line" > < a name = "l00183" > < / a > < span class = "lineno" > 183< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00184" > < / a > < span class = "lineno" > 184< / span >   }< / div >
< div class = "line" > < a name = "l00185" > < / a > < span class = "lineno" > 185< / span >   < / div >
< div class = "line" > < a name = "l00186" > < / a > < span class = "lineno" > 186< / span >   < span class = "comment" > // AES-CBC decrypt everything up to the next-to-last full block.< / span > < / div >
< div class = "line" > < a name = "l00187" > < / a > < span class = "lineno" > 187< / span >   < span class = "keywordtype" > size_t< / span > cbc_size = ciphertext_size - residual_block_size;< / div >
< div class = "line" > < a name = "l00188" > < / a > < span class = "lineno" > 188< / span >   < span class = "keywordflow" > if< / span > (cbc_size > AES_BLOCK_SIZE) {< / div >
< div class = "line" > < a name = "l00189" > < / a > < span class = "lineno" > 189< / span >   AES_cbc_encrypt(ciphertext,< / div >
< div class = "line" > < a name = "l00190" > < / a > < span class = "lineno" > 190< / span >   plaintext,< / div >
< div class = "line" > < a name = "l00191" > < / a > < span class = "lineno" > 191< / span >   cbc_size - AES_BLOCK_SIZE,< / div >
< div class = "line" > < a name = "l00192" > < / a > < span class = "lineno" > 192< / span >   aes_key_.get(),< / div >
< div class = "line" > < a name = "l00193" > < / a > < span class = "lineno" > 193< / span >   & iv[0],< / div >
< div class = "line" > < a name = "l00194" > < / a > < span class = "lineno" > 194< / span >   AES_DECRYPT);< / div >
< div class = "line" > < a name = "l00195" > < / a > < span class = "lineno" > 195< / span >   }< / div >
< div class = "line" > < a name = "l00196" > < / a > < span class = "lineno" > 196< / span >   < / div >
< div class = "line" > < a name = "l00197" > < / a > < span class = "lineno" > 197< / span >   < span class = "comment" > // Determine what the last IV should be so that we can " skip ahead" in the< / span > < / div >
< div class = "line" > < a name = "l00198" > < / a > < span class = "lineno" > 198< / span >   < span class = "comment" > // CBC decryption.< / span > < / div >
< div class = "line" > < a name = "l00199" > < / a > < span class = "lineno" > 199< / span >   std::vector< uint8_t> last_iv(< / div >
< div class = "line" > < a name = "l00200" > < / a > < span class = "lineno" > 200< / span >   ciphertext + ciphertext_size - residual_block_size,< / div >
< div class = "line" > < a name = "l00201" > < / a > < span class = "lineno" > 201< / span >   ciphertext + ciphertext_size);< / div >
< div class = "line" > < a name = "l00202" > < / a > < span class = "lineno" > 202< / span >   last_iv.resize(AES_BLOCK_SIZE, 0);< / div >
< div class = "line" > < a name = "l00203" > < / a > < span class = "lineno" > 203< / span >   < / div >
< div class = "line" > < a name = "l00204" > < / a > < span class = "lineno" > 204< / span >   < span class = "comment" > // Decrypt the next-to-last block using the IV determined above. This decrypts< / span > < / div >
< div class = "line" > < a name = "l00205" > < / a > < span class = "lineno" > 205< / span >   < span class = "comment" > // the residual block bits.< / span > < / div >
< div class = "line" > < a name = "l00206" > < / a > < span class = "lineno" > 206< / span >   AES_cbc_encrypt(< / div >
< div class = "line" > < a name = "l00207" > < / a > < span class = "lineno" > 207< / span >   ciphertext + ciphertext_size - residual_block_size - AES_BLOCK_SIZE,< / div >
< div class = "line" > < a name = "l00208" > < / a > < span class = "lineno" > 208< / span >   plaintext + ciphertext_size - residual_block_size - AES_BLOCK_SIZE,< / div >
< div class = "line" > < a name = "l00209" > < / a > < span class = "lineno" > 209< / span >   AES_BLOCK_SIZE, aes_key_.get(), & last_iv[0], AES_DECRYPT);< / div >
< div class = "line" > < a name = "l00210" > < / a > < span class = "lineno" > 210< / span >   < / div >
< div class = "line" > < a name = "l00211" > < / a > < span class = "lineno" > 211< / span >   < span class = "comment" > // Swap back the residual block bits and the next-to-last full block.< / span > < / div >
< div class = "line" > < a name = "l00212" > < / a > < span class = "lineno" > 212< / span >   < span class = "keywordflow" > if< / span > (plaintext == ciphertext) {< / div >
< div class = "line" > < a name = "l00213" > < / a > < span class = "lineno" > 213< / span >   uint8_t* ptr1 = plaintext + ciphertext_size - residual_block_size;< / div >
< div class = "line" > < a name = "l00214" > < / a > < span class = "lineno" > 214< / span >   uint8_t* ptr2 = plaintext + ciphertext_size - residual_block_size - AES_BLOCK_SIZE;< / div >
< div class = "line" > < a name = "l00215" > < / a > < span class = "lineno" > 215< / span >   < span class = "keywordflow" > for< / span > (< span class = "keywordtype" > size_t< / span > i = 0; i < residual_block_size; ++i) {< / div >
< div class = "line" > < a name = "l00216" > < / a > < span class = "lineno" > 216< / span >   uint8_t temp = *ptr1;< / div >
< div class = "line" > < a name = "l00217" > < / a > < span class = "lineno" > 217< / span >   *ptr1 = *ptr2;< / div >
< div class = "line" > < a name = "l00218" > < / a > < span class = "lineno" > 218< / span >   *ptr2 = temp;< / div >
< div class = "line" > < a name = "l00219" > < / a > < span class = "lineno" > 219< / span >   ++ptr1;< / div >
< div class = "line" > < a name = "l00220" > < / a > < span class = "lineno" > 220< / span >   ++ptr2;< / div >
< div class = "line" > < a name = "l00221" > < / a > < span class = "lineno" > 221< / span >   }< / div >
< div class = "line" > < a name = "l00222" > < / a > < span class = "lineno" > 222< / span >   } < span class = "keywordflow" > else< / span > {< / div >
< div class = "line" > < a name = "l00223" > < / a > < span class = "lineno" > 223< / span >   uint8_t* residual_plaintext_block =< / div >
< div class = "line" > < a name = "l00224" > < / a > < span class = "lineno" > 224< / span >   plaintext + ciphertext_size - residual_block_size;< / div >
< div class = "line" > < a name = "l00225" > < / a > < span class = "lineno" > 225< / span >   memcpy(residual_plaintext_block, residual_plaintext_block - AES_BLOCK_SIZE,< / div >
< div class = "line" > < a name = "l00226" > < / a > < span class = "lineno" > 226< / span >   residual_block_size);< / div >
< div class = "line" > < a name = "l00227" > < / a > < span class = "lineno" > 227< / span >   memcpy(residual_plaintext_block - AES_BLOCK_SIZE,< / div >
< div class = "line" > < a name = "l00228" > < / a > < span class = "lineno" > 228< / span >   ciphertext + ciphertext_size - residual_block_size,< / div >
< div class = "line" > < a name = "l00229" > < / a > < span class = "lineno" > 229< / span >   residual_block_size);< / div >
< div class = "line" > < a name = "l00230" > < / a > < span class = "lineno" > 230< / span >   }< / div >
< div class = "line" > < a name = "l00231" > < / a > < span class = "lineno" > 231< / span >   < / div >
< div class = "line" > < a name = "l00232" > < / a > < span class = "lineno" > 232< / span >   < span class = "comment" > // Decrypt the last full block.< / span > < / div >
< div class = "line" > < a name = "l00233" > < / a > < span class = "lineno" > 233< / span >   AES_cbc_encrypt(< / div >
< div class = "line" > < a name = "l00234" > < / a > < span class = "lineno" > 234< / span >   plaintext + ciphertext_size - residual_block_size - AES_BLOCK_SIZE,< / div >
< div class = "line" > < a name = "l00235" > < / a > < span class = "lineno" > 235< / span >   plaintext + ciphertext_size - residual_block_size - AES_BLOCK_SIZE,< / div >
< div class = "line" > < a name = "l00236" > < / a > < span class = "lineno" > 236< / span >   AES_BLOCK_SIZE, aes_key_.get(), & iv[0], AES_DECRYPT);< / div >
< div class = "line" > < a name = "l00237" > < / a > < span class = "lineno" > 237< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00238" > < / a > < span class = "lineno" > 238< / span >   }< / div >
< div class = "line" > < a name = "l00239" > < / a > < span class = "lineno" > 239< / span >   < / div >
< div class = "line" > < a name = "l00240" > < / a > < span class = "lineno" > 240< / span >   < span class = "keywordtype" > bool< / span > AesCbcCtsDecryptor::Decrypt(< span class = "keyword" > const< / span > std::vector< uint8_t> & ciphertext,< / div >
< div class = "line" > < a name = "l00241" > < / a > < span class = "lineno" > 241< / span >   std::vector< uint8_t> * plaintext) {< / div >
< div class = "line" > < a name = "l00242" > < / a > < span class = "lineno" > 242< / span >   DCHECK(plaintext);< / div >
< div class = "line" > < a name = "l00243" > < / a > < span class = "lineno" > 243< / span >   < / div >
< div class = "line" > < a name = "l00244" > < / a > < span class = "lineno" > 244< / span >   plaintext-> resize(ciphertext.size(), 0);< / div >
< div class = "line" > < a name = "l00245" > < / a > < span class = "lineno" > 245< / span >   < span class = "keywordflow" > if< / span > (ciphertext.empty())< / div >
< div class = "line" > < a name = "l00246" > < / a > < span class = "lineno" > 246< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00247" > < / a > < span class = "lineno" > 247< / span >   < / div >
< div class = "line" > < a name = "l00248" > < / a > < span class = "lineno" > 248< / span >   < span class = "keywordflow" > return< / span > Decrypt(ciphertext.data(), ciphertext.size(), & (*plaintext)[0]);< / div >
< div class = "line" > < a name = "l00249" > < / a > < span class = "lineno" > 249< / span >   }< / div >
< div class = "line" > < a name = "l00250" > < / a > < span class = "lineno" > 250< / span >   < / div >
< div class = "line" > < a name = "l00251" > < / a > < span class = "lineno" > 251< / span >   < span class = "keywordtype" > bool< / span > AesCbcCtsDecryptor::Decrypt(< span class = "keyword" > const< / span > std::string& ciphertext,< / div >
< div class = "line" > < a name = "l00252" > < / a > < span class = "lineno" > 252< / span >   std::string* plaintext) {< / div >
< div class = "line" > < a name = "l00253" > < / a > < span class = "lineno" > 253< / span >   NOTIMPLEMENTED();< / div >
< div class = "line" > < a name = "l00254" > < / a > < span class = "lineno" > 254< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00255" > < / a > < span class = "lineno" > 255< / span >   }< / div >
< div class = "line" > < a name = "l00256" > < / a > < span class = "lineno" > 256< / span >   < / div >
< div class = "line" > < a name = "l00257" > < / a > < span class = "lineno" > < a class = "line" href = "../../dd/d96/classedash__packager_1_1media_1_1AesCbcCtsDecryptor.html#a7d8a104a275aac3d21da556c2ad6f86c" > 257< / a > < / span >   < span class = "keywordtype" > bool< / span > < a class = "code" href = "../../dd/d96/classedash__packager_1_1media_1_1AesCbcCtsDecryptor.html#a7d8a104a275aac3d21da556c2ad6f86c" > AesCbcCtsDecryptor::SetIv< / a > (< span class = "keyword" > const< / span > std::vector< uint8_t> & iv) {< / div >
< div class = "line" > < a name = "l00258" > < / a > < span class = "lineno" > 258< / span >   < span class = "keywordflow" > if< / span > (iv.size() != AES_BLOCK_SIZE) {< / div >
< div class = "line" > < a name = "l00259" > < / a > < span class = "lineno" > 259< / span >   LOG(ERROR) < < < span class = "stringliteral" > " Invalid IV size: " < / span > < < iv.size();< / div >
< div class = "line" > < a name = "l00260" > < / a > < span class = "lineno" > 260< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > false< / span > ;< / div >
< div class = "line" > < a name = "l00261" > < / a > < span class = "lineno" > 261< / span >   }< / div >
< div class = "line" > < a name = "l00262" > < / a > < span class = "lineno" > 262< / span >   < / div >
< div class = "line" > < a name = "l00263" > < / a > < span class = "lineno" > 263< / span >   iv_ = iv;< / div >
< div class = "line" > < a name = "l00264" > < / a > < span class = "lineno" > 264< / span >   < span class = "keywordflow" > return< / span > < span class = "keyword" > true< / span > ;< / div >
< div class = "line" > < a name = "l00265" > < / a > < span class = "lineno" > 265< / span >   }< / div >
< div class = "line" > < a name = "l00266" > < / a > < span class = "lineno" > 266< / span >   < / div >
< div class = "line" > < a name = "l00267" > < / a > < span class = "lineno" > 267< / span >   } < span class = "comment" > // namespace media< / span > < / div >
< div class = "line" > < a name = "l00268" > < / a > < span class = "lineno" > 268< / span >   } < span class = "comment" > // namespace edash_packager< / span > < / div >
< div class = "ttc" id = "classedash__packager_1_1media_1_1AesCbcCtsDecryptor_html_a7d8a104a275aac3d21da556c2ad6f86c" > < div class = "ttname" > < a href = "../../dd/d96/classedash__packager_1_1media_1_1AesCbcCtsDecryptor.html#a7d8a104a275aac3d21da556c2ad6f86c" > edash_packager::media::AesCbcCtsDecryptor::SetIv< / a > < / div > < div class = "ttdeci" > bool SetIv(const std::vector< uint8_t > & iv) override< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "../../da/df4/aes__decryptor_8cc_source.html#l00257" > aes_decryptor.cc:257< / a > < / div > < / div >
< div class = "ttc" id = "classedash__packager_1_1media_1_1AesCtrDecryptor_html_ad8a3e36af755f380c62fd1f058ee678b" > < div class = "ttname" > < a href = "../../df/d06/classedash__packager_1_1media_1_1AesCtrDecryptor.html#ad8a3e36af755f380c62fd1f058ee678b" > edash_packager::media::AesCtrDecryptor::SetIv< / a > < / div > < div class = "ttdeci" > bool SetIv(const std::vector< uint8_t > & iv) override< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "../../da/df4/aes__decryptor_8cc_source.html#l00060" > aes_decryptor.cc:60< / a > < / div > < / div >
< div class = "ttc" id = "classedash__packager_1_1media_1_1AesCbcPkcs5Decryptor_html_ae656e1d162064360bb6adfb90bc8edfb" > < div class = "ttname" > < a href = "../../db/dfe/classedash__packager_1_1media_1_1AesCbcPkcs5Decryptor.html#ae656e1d162064360bb6adfb90bc8edfb" > edash_packager::media::AesCbcPkcs5Decryptor::SetIv< / a > < / div > < div class = "ttdeci" > bool SetIv(const std::vector< uint8_t > & iv) override< / div > < div class = "ttdef" > < b > Definition:< / b > < a href = "../../da/df4/aes__decryptor_8cc_source.html#l00129" > aes_decryptor.cc:129< / a > < / div > < / div >
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