INSTRUCTIONS FOR PERFORMING DATA ENCRYPTION STANDARD (DES) COMPUTATIONS USING GENERAL-PURPOSE REGISTERS
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United States of America Patent
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Issued Date -
Dec 30, 2010
app pub date -
Jun 30, 2009
filing date -
Jun 30, 2009
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Abandoned
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Abstract
Some embodiments of the present invention provide a processor, which includes a set of general-purpose registers and at least one execution unit. Each general-purpose register in the set of general-purpose registers is at least 64 bits wide, and the execution unit supports one or more Data Encryption Standard (DES) instructions. Specifically, the execution unit may support a permutation-rotation instruction for performing DES permutation operations and DES rotation operations. The execution unit may also support a round instruction to perform a DES round operation. Since the DES instructions use general-purpose registers instead of special-purpose registers to perform DES-specific operations, the processor's circuit complexity and area are reduced. Furthermore, in some embodiments, since the DES instructions require at most two operands, the number of bits required to specify the location of the operands are reduced, thereby enabling a larger number of instructions to be supported by the processor.
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