Cipher message assist instructions

A computer program product for executing a cipher message instruction in a computer system the computer program product comprising:

• a storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising:
• fetching the cipher message instruction for execution;
• and
• executing the fetched cipher message instruction, the executing step comprising the steps of;
• obtaining cipher message information from a predefined general, register, the cipher message information comprising a function code field, the function code field containing a function field value, the function field value indicating a cipher message function to be performed;
• wherein the function code value comprises an indication of a cipher message function to be performed consisting of any one of a KM-Query operation, a KM-DEA 64-bit key cryptographic operation, a KM-Triple DEA two 64-bit key cryptographic operation or a KM-Triple DEA three 64-bit key cryptographic operation;
• based on the obtained function field value, if the cipher message function La be performed is a cipher operation, performing steps a) through d), comprising;
• a) obtaining a cryptographic key from a parameter block in memory, the parameter block having an address specified by a general register of a plurality of general registers;
• b) obtaining a first operand from memory;
• c) performing the cipher message function indicated by the function field value on the obtained first operand using the obtained cryptographic key;
• and
• d) storing a result of the cipher message function performed as a second operand in memory;
• and
• based on the obtained function field value, if the cipher message function to be performed is a function query operation, performing steps i) through j) comprising;
• i) determining for each of one or more cipher message functions whether the cipher message function is installed on the computer system for execution by a cipher message instruction;
• and
• j) saving a status word in a parameter block in memory, the parameter block having an address specified by a general register of plurality of general registers, the status word comprising one or more status word bits, each one of the one or more status word bits indicating whether a corresponding one of said one or more cipher message functions is installed on said computer system, each one of the one or more status word bits having a position in the status word corresponding to the function field value of the corresponding cipher message function.

A system for executing a cipher message instruction in a computer system, the cipher message instruction comprising a query function, the system comprising

• a computer memory;
• a plurality of general registers, a general purpose processor in communications with the computer memory, the processor comprising one or more execution units, the execution units configured to execute instructions fetched from the computer memory;
• wherein the computer system performs a method comprising the steps of;
• fetching the cipher message instruction for execution;
• and
• executing the fetched cipher message instruction, the executing step comprising the steps of;
• obtaining cipher message information from a predefined general register, the cipher message information comprising a function code field, the function code field containing a function field value, the function field value indicating a cipher message function to be performed;
• wherein the function code value comprises an indication of a cipher message function to be performed consisting of any one of a KM-Query operation, a KM-DEA 64-bit key cryptographic operation, a KM-Triple DEA two 64-bit key cryptographic operation or a KM-Triple DEA three 64-bit key cryptographic operation;
• based on the obtained function field value) if the cipher message function to be performed is a cipher operation, performing steps a) through j), comprising;
• a) obtaining a cryptographic key from a parameter black in memory, the parameter block having an address specified by a general register of a plurality of general registers;
• b) obtaining a first operand from memory;
• c) performing the cipher message function indicated by the function field value on the obtained first operand using the obtained cryptographic key;
• and
• d) storing a result of the cipher message function performed as a second operand in memory;
• and
• based on the obtained function field value, it the cipher message function to be performed is a function query operation, performing steps i) through j) comprising;
• i) determining for each of one or more cipher message functions whether the cipher message function is installed on the computer system for execution by a cipher message instruction;
• and
• j) saving a status word in a parameter block in memory, the parameter block having an address specified by a general register of a plurality of general registers, the status word comprising one or more status word bits, each one of the one or more status word bits indicating whether a corresponding one of said one or more cipher message functions is installed on said computer system each one of the one or more status word bits having a position in the status word corresponding to the function field value of the corresponding cipher message function.