Programming the Secure Signing Key
After the boot image is signed, the private key is retained in secure storage at the original equipment manufacturer (OEM) to protect it. The public key is programmed into the device. For some signing key types, a hash of the public key is programmed.
The signing key type determines the location of the public key. The available signing key types and corresponding locations are described in the following table.
|Root Key||Key Type||Description|
|Secure User Key||Fuse||
You generate secure key pair for boot ROM to attempt authentication. The SHA256 hash of the public key is stored in the User Access Fuses (UAF) of the device. This configuration provides a secure boot.
For information about secure fuses, refer to the Secure Fuses section in the SoC Security chapter of the Intel® Arria® 10 Hard Processor System Technical Reference Manual.
|FPGA Key||FPGA||The public key originates from your bitstream. The key is stored in FPGA on-chip RAM and accessed by the first stage boot ROM for image authentication. When you store the FPGA key in on-chip RAM, you must turn on the Enable boot from fpga signals option on the FPGA Interfaces tab of the Intel® Arria® 10 Hard Processor System Intel® Arria® 10 FPGA IP GUI.|
|Unsecured User Key||User||You generate a secure key pair but it is not stored on the device. This configuration is unsecure and is for testing only. You include the root key result in the image header and the boot ROM uses it for authentication.|
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