# Generate symmetric keys with the AWS CloudHSM KMU Use the [genSymKey](key_mgmt_util-genSymKey.md) command in AWS CloudHSM key\_mgmt\_util (KMU) to generate AES and other types of symmetric keys for AWS CloudHSM. To see all available options, use the **genSymKey -h** command. The following example creates a 256-bit AES key. ``` Command: genSymKey -t 31 -s 32 -l aes256 Cfm3GenerateSymmetricKey returned: 0x00 : HSM Return: SUCCESS Symmetric Key Created. Key Handle: 524295 Cluster Error Status Node id 0 and err state 0x00000000 : HSM Return: SUCCESS Node id 1 and err state 0x00000000 : HSM Return: SUCCESS Node id 2 and err state 0x00000000 : HSM Return: SUCCESS ```