International Business Machines Corporation

Martijn Diede Berkers

Silvia Melitta Mueller

Debapriya Chatterjee

Niels Fricke

Kattamuri Ekanadham

Maarten Jakob Boersma

A processor includes a register file and an execution unit. The execution unit includes a hash circuit including at least a state register, a state update circuit coupled to the state register, and a control circuit. Based on a hash instruction, the hash circuit receives from the register file and buffers within the state register a current state of a message being hashed. The state update circuit performs state update function on contents of the state register, where performing the state update function includes performing a plurality of iterative rounds of processing on contents of the state register and returning a result of each of the plurality of iterative rounds of processing to the state register. Following completion of all of the plurality of iterative rounds of processing, the execution unit stores contents of the state register to the register file as an updated state of the message.

Hardware-based implementation of secure hash algorithms

A processor includes an execution unit for executing a message padding instruction including an operand field indicating a register buffering a message block segment of a message block to be padded and a mode field indicating which hash functions is to be applied to the message block. The execution unit includes a padding circuit configured to receive a message block segment from a register indicated by the operand field, where the message block spans multiple registers in a register file. Based on which hash function is indicated by the mode field, the padding circuit selects a byte location in the message block segment at which to insert at least one padding byte and inserts the at least one padding byte at the byte location within the message block segment. The message block segment as padded by the at least one padding byte is written back to the register file.

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Boeblingen, Germany

Martijn Diede Berkers