Intel Advanced Encryption Standard New Instructions

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You'll find these instructions on any mid-tier Intel CPU since about 2010 and any AMD CPU since about 2011. Support for these is indicated by checking bit 25 in ecx after calling CPUID with eax = 0x00000001.

Overview

Instruction	Description
AESENC	encrypt a round
AESENCLAST	encrypt last round
AESDEC	decrypt a round
AESDECLAST	decrypt last round
AESIMC	AES inverse mix columns
AESKEYGENASSIST	used for key expansion

See Also

Articles

• AES instruction set

External Links

• Intel Paper, including C code samples
• A blog post showing an example implementation using GCC's builtins