To create a custom authorizer

The following create-authorizer example creates a custom authorizer that uses the specified Lambda function as part of a custom authentication service.

   aws iot create-authorizer \
       --authorizer-name "CustomAuthorizer" \
       --authorizer-function-arn "arn:aws:lambda:us-west-2:123456789012:function:CustomAuthorizerFunction" \
       --token-key-name "MyAuthToken" \
       --status ACTIVE \
       --token-signing-public-keys FIRST_KEY="-----BEGIN PUBLIC KEY-----
MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA1uJOB4lQPgG/lM6ZfIwo
Z+7ENxAio9q6QD4FFqjGZsvjtYwjoe1RKK0U8Eq9xb5O3kRSmyIwTzwzm/f4Gf0Y
ZUloJ+t3PUUwHrmbYTAgTrCUgRFygjfgVwGCPs5ZAX4Eyqt5cr+AIHIiUDbxSa7p
zwOBKPeic0asNJpqT8PkBbRaKyleJh5oo81NDHHmVtbBm5A5YiJjqYXLaVAowKzZ
+GqsNvAQ9Jy1wI2VrEa1OfL8flDB/BJLm7zjpfPOHDJQgID0XnZwAlNnZcOhCwIx
50g2LW2Oy9R/dmqtDmJiVP97Z4GykxPvwlYHrUXY0iW1R3AR/Ac1NhCTGZMwVDB1
lQIDAQAB
-----END PUBLIC KEY-----"

Output:

{
    "authorizerName": "CustomAuthorizer",
    "authorizerArn": "arn:aws:iot:us-west-2:123456789012:authorizer/CustomAuthorizer2"
}

For more information, see CreateAuthorizer in the AWS IoT API Reference.