RISC-V ISA Explorer · Cryptography (Zk*)

Zknd: NIST AES Decrypt

Ratified 2022-02 · version 1.0.1

Accelerates AES decryption rounds and the inverse key schedule in the general-purpose registers.

Typical use: AES decryption instructions

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Dependencies

Required by

Zkn

Instructions (7)

Mnemonic	Name	Encoding	Match	Mask
`AES32DSI`	AES final round decryption instruction for RV32	`--10101----------000-----0110011`	`0x2a000033`	`0x3e00707f`
`AES32DSMI`	AES middle round decryption instruction for RV32	`--10111----------000-----0110011`	`0x2e000033`	`0x3e00707f`
`AES64DS`	AES decrypt final round	`0011101----------000-----0110011`	`0x3a000033`	`0xfe00707f`
`AES64DSM`	AES decrypt middle round	`0011111----------000-----0110011`	`0x3e000033`	`0xfe00707f`
`AES64IM`	AES Decrypt KeySchedule MixColumns	`001100000000-----001-----0010011`	`0x30001013`	`0xfff0707f`
`AES64KS1I`	AES Key Schedule Instruction 1	`00110001---------001-----0010011`	`0x31001013`	`0xff00707f`
`AES64KS2`	AES Key Schedule Instruction 2	`0111111----------000-----0110011`	`0x7e000033`	`0xfe00707f`