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HDCP Encryption/Decryption Code Released
rtj writes "We have released an open-source (BSD licensed) implementation of the HDCP encryption/decryption algorithms. The code includes the block cipher, stream cipher, and hashing algorithms necessary to perform an HDCP handshake and to encrypt or decrypt video. The code passes the test vectors provided in the HDCP specification and can encrypt video at a rate of about 180 640x480 frames/second on a 2.33GHz Intel Xeon CPU. This isn't quite fast enough to decrypt 1080p content in real-time on a single core, but decryption can be parallelized across multiple cores. There are also many opportunities for further optimisation, such as using SSE instructions. We are releasing the code in hopes that others will further optimize it and use it in their HDCP-related projects."
Intel's statement had to do with the security of the use case of HDCP: digital video encrypted with HDCP being transported over HDMI cables. In other words, the hardware Intel claims is required, is specialized hardware which interfaces with HDMI ports. This software implementation is not interesting for cracking encrypted video if it cannot communicate with the Blu-Ray or other media player in question in a way which tricks the media player into thinking that the computer running the software is a certified display device.
Errrrr the point of this software is to perform the handshake which authenticates it as a legitimate source or sink device. The master key also allows you to simply generate a NEW device key if the one you are using happens to get blacklisted by a firmware update.
The reason this is useful is not for bluray, it is for first-run broadcast content.