HDCP Repeater工作模式流程总结 ——第一阶段

本文详细介绍了HDCP协议认证的第一阶段，包括HDMI设备间的KSV交换、REPEATER bit判断、共享密钥Km的生成以及加密验证过程，确保设备间的合法连接。

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HDCP认证总共分三个阶段：

1. First Part ——协议认证,如果hdmi连接线两端的设备都有合法的Device Key Set，则第一步通过。

2. Second Part——适用于存在Repeater的情况下，Repeater设备上报自己下游所连接的KSVs.

3. Third Part——内容加密

首先了解这么几个单词的基本意思：

Key Selection Vector (KSV). Each HDCP Device contais a set of Device Private Keys .A set of Device Private Keys is associated with a KSV. Each HDCP Transmitter has assigned to it a unique KSV from all other HDCP Transmitters. Also ,echo HDCP Receiver has assigned to it a unique KSV from all other HDCP Receivers.The KSV is a 40-bit binary value.（密钥选择矢量：每个HDCP设备都包含一个KSV，KSV是一个40bit的二进制数值，由20个0和20个1组成）

Device Private Keys. A set of Device Private Keys consists of 40 different 56-bit values.These keys are to be protected from exposure outside of the HDCP Device.A set of Device Private Keys is associated with a unique Key Selection Vector .（设备密钥：每个HDCP设备都有一组40个56bit密钥组成的合集，这里面每一个密钥都必须是合法的。）