44 lines
1.8 KiB
C++
44 lines
1.8 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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// Copyright 2016 Google LLC.
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//
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// This software is licensed under the terms defined in the Widevine Master
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// License Agreement. For a copy of this agreement, please contact
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// widevine-licensing@google.com.
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////////////////////////////////////////////////////////////////////////////////
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#ifndef COMMON_AES_CBC_UTIL_H_
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#define COMMON_AES_CBC_UTIL_H_
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#include <string>
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namespace widevine {
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namespace crypto_util {
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// Helper for wrapping AES CBC encryption. Uses PKCS7 padding.
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std::string EncryptAesCbc(const std::string& key, const std::string& iv,
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const std::string& plaintext);
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// Helper for wrapping AES CBC encryption. Adds no padding, so the input
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// must be an multiple of the 16-byte AES block size. Returns empty std::string
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// on error.
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std::string EncryptAesCbcNoPad(const std::string& key, const std::string& iv,
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const std::string& plaintext);
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// Helper for common Keybox decrypt operations; wraps AES-CBC. Returns an
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// empty std::string on error or the plaintext on success. Expects PKCS7 padding.
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std::string DecryptAesCbc(const std::string& key, const std::string& iv,
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const std::string& ciphertext);
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// Helper for common Keybox decrypt operations; wraps AES-CBC. Returns an
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// empty std::string on error or the plaintext on success.
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// Uses no padding; fails if the ciphertext is not a multiple of 16 bytes.
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// This is used to decrypt the encrypted blob in the WVM keyboxes, with
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// a zero iv.
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std::string DecryptAesCbcNoPad(const std::string& key, const std::string& iv,
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const std::string& ciphertext);
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} // namespace crypto_util
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} // namespace widevine
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#endif // COMMON_AES_CBC_UTIL_H_
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