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."
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