Implements pattern-based encryption/decryption. More...

Inheritance diagram for shaka::media::AesPatternCryptor:

Public Types
enum	PatternEncryptionMode { kEncryptIfCryptByteBlockRemaining , kSkipIfCryptByteBlockRemaining }

Public Types inherited from shaka::media::AesCryptor
enum	ConstantIvFlag { kUseConstantIv , kDontUseConstantIv }

Public Member Functions
	AesPatternCryptor (uint8_t crypt_byte_block, uint8_t skip_byte_block, PatternEncryptionMode encryption_mode, ConstantIvFlag constant_iv_flag, std::unique_ptr< AesCryptor > cryptor)

AesCryptor implementation overrides.
bool	InitializeWithIv (const std::vector< uint8_t > &key, const std::vector< uint8_t > &iv) override

Public Member Functions inherited from shaka::media::AesCryptor
	AesCryptor (ConstantIvFlag constant_iv_flag)

virtual size_t	RequiredOutputSize (size_t plaintext_size)

bool	SetIv (const std::vector< uint8_t > &iv)

void	UpdateIv ()

const std::vector< uint8_t > &	iv () const

bool	use_constant_iv () const

bool	Crypt (const std::vector< uint8_t > &text, std::vector< uint8_t > *crypt_text)

bool	Crypt (const std::string &text, std::string *crypt_text)

bool	Crypt (const uint8_t text, size_t text_size, uint8_t crypt_text)

bool	Crypt (const uint8_t text, size_t text_size, uint8_t crypt_text, size_t *crypt_text_size)

Additional Inherited Members
Static Public Member Functions inherited from shaka::media::AesCryptor
static bool	GenerateRandomIv (FourCC protection_scheme, std::vector< uint8_t > *iv)

Protected Types inherited from shaka::media::AesCryptor
enum	CipherMode { kCtrMode , kCbcMode }

Protected Member Functions inherited from shaka::media::AesCryptor
bool	SetupCipher (size_t key_size, CipherMode mode)

Protected Attributes inherited from shaka::media::AesCryptor
mbedtls_cipher_context_t	cipher_ctx_

Detailed Description

Implements pattern-based encryption/decryption.

Definition at line 16 of file aes_pattern_cryptor.h.

Member Enumeration Documentation

Enumerator for controling encrytion/decryption mode for the last encryption/decrytion block(s).

Enumerator
kEncryptIfCryptByteBlockRemaining	Use kEncryptIfCryptByteBlockRemaining to encrypt all the full 16-byte blocks even if the remaining bytes are less than encryption_block_bytes. IOW: if (remaining_bytes <= encryption_block_bytes) encrypt(block_aligned_remaining_data)
kSkipIfCryptByteBlockRemaining	Use kSkipIfCryptByteBlockRemaining to not encrypt/decrypt the remaining bytes if it is less than or equal to encryption_block_bytes. if (remaining_bytes > encryption_block_bytes) encrypt(). Use this mode for HLS SAMPLE-AES.

Definition at line 20 of file aes_pattern_cryptor.h.

shaka::media::AesPatternCryptor::AesPatternCryptor	(	uint8_t	crypt_byte_block,
		uint8_t	skip_byte_block,
		PatternEncryptionMode	encryption_mode,
		ConstantIvFlag	constant_iv_flag,
		std::unique_ptr< AesCryptor >	cryptor
	)

Parameters

crypt_byte_block	indicates number of encrypted blocks (16-byte) in pattern based encryption.
skip_byte_block	indicates number of unencrypted blocks (16-byte) in pattern based encryption.
encryption_mode	is used to determine the behavior for the last block.
constant_iv_flag	indicates whether a constant iv is used, kUseConstantIv means that the same iv is used for all Crypt calls until iv is changed via SetIv; otherwise, iv can be incremented (for counter mode) or chained (for cipher block chaining mode) internally inside Crypt call, i.e. iv will be updated across Crypt calls.
cryptor	points to an AesCryptor instance which performs the actual encryption/decryption. Note that cryptor shall not use constant iv.

Definition at line 19 of file aes_pattern_cryptor.cc.

bool shaka::media::AesPatternCryptor::InitializeWithIv	(	const std::vector< uint8_t > &	key,
		const std::vector< uint8_t > &	iv
	)

overridevirtual

Initialize the cryptor with specified key and IV.

Definition at line 38 of file aes_pattern_cryptor.cc.

The documentation for this class was generated from the following files: