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APPARATUS FOR GENERATING A DECRYPTION KEY FOR USE TO DECRYPT A BLOCK OF ENCRYPTED INSTRUCTION DATA BEING FETCHED FROM AN INSTRUCTION CACHE IN A MICROPROCESSOR
APPARATUS FOR GENERATING A DECRYPTION KEY FOR USE TO DECRYPT A BLOCK OF ENCRYPTED INSTRUCTION DATA BEING FETCHED FROM AN INSTRUCTION CACHE IN A MICROPROCESSOR
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机译:用于生成解密密钥的设备,该解密密钥用于解密从微处理器中的指令缓存中获取的加密指令数据块
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摘要
An apparatus for generating a decryption key for use to decrypt a block of encrypted instruction data being fetched from an instruction cache in a microprocessor at a fetch address includes a first multiplexer that selects a first key value from a plurality of key values based on a first portion of the fetch address. A second multiplexer selects a second key value from the plurality of key values based on the first portion of the fetch address. A rotater rotates the first key value based on a second portion of the fetch address. An arithmetic unit selectively adds or subtracts the rotated first key value to or from the second key value based on a third portion of the fetch address to generate the decryption key.
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