srktool question

_andev_ — Fri, 15 May 2015 09:44:54 GMT

Hi,

Am I wondering how the SRK_1_2_3_4_fuse.bin file is created from SRK_1_2_3_4_table.bin.

Our keys are SRK?_sha256_4096_65537_v3_ca_crt.der/pem then I suppose srktool uses SHA-256

hash algorithm but I'm not a security expert.

I would like to get the fuse.bin file from the table.bin with some console commands, is it possible?

Regards

Re: srktool question

Yuri — Wed, 10 Jun 2015 09:50:02 GMT

From app note AN4581 : “To generate an SRK table, the CST provides the srktool […]”.

The fuse.bin file is “the SRK hash eFuse result of the srktool for an SRK table consisting
of four keys”. It should be burned to the fuses. Please refer to section 5.4 (Provisioning

the SRK Hash eFuse Field for i.MX50 and i.MX 6 Series).

The SRK is intended to check “our keys”. “SRK: Super Root Key, an RSA key pair which forms
the start of the boot-time authentication chain. The hash of the SRK public key is embedded
in the processor using OTP hardware. The SRK private key is held by the CA. Unless explicitly
noted, SRK in this document refers to the publickey only.”

Have a great day,
Yuri

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