topic Re: OPENSSL to verify CSF & IMG certificates in i.MX Processors

OPENSSL to verify CSF & IMG certificates

satyadamarla — Wed, 12 Jul 2017 08:13:32 GMT

Hello,

There are three certificates: SRK, CSF & IMG.

SRK is kind of intermediary certificate, whereas CSF and IMG are subordinate or user certificate. The SRK certificate is signed by CA whereas the CSF/IMG are signed by SRK.

I tried to verify the SRK and it works well:

openssl verify -CAfile CA1_sha256_3072_65537_v3_ca_crt.pem SRK1_sha256_3072_65537_v3_ca_crt.pem
SRK1_sha256_3072_65537_v3_ca_crt.pem: OK

Whereas when I try to verify the IMG and CSF with SRK or CA, it doesn't work:

openssl verify -CAfile SRK1_sha256_3072_65537_v3_ca_crt.pem CSF1_1_sha256_3072_65537_v3_usr_crt.pem
CSF1_1_sha256_3072_65537_v3_usr_crt.pem: CN = SRK1_sha256_3072_65537_v3_ca
error 2 at 1 depth lookup:unable to get issuer certificate

openssl verify -CAfile SRK1_sha256_3072_65537_v3_ca_crt.pem IMG1_1_sha256_3072_65537_v3_usr_crt.pem
IMG1_1_sha256_3072_65537_v3_usr_crt.pem: CN = SRK1_sha256_3072_65537_v3_ca
error 2 at 1 depth lookup:unable to get issuer certificate

Can anyone suggest me how to verify CSF & IMG certificates properly?

Greets,

Satya

Re: OPENSSL to verify CSF & IMG certificates

satyadamarla — Wed, 12 Jul 2017 08:59:20 GMT

Hi,

I found the solution myself after a bit of googling. It's important to create the chain. So, I did the following

cat SRK1_sha256_3072_65537_v3_ca_crt.pem CA1_sha256_3072_65537_v3_ca_crt.pem > SRK1-CA-chain.pem

openssl verify -CAfile SRK1-CA-chain.pem CSF1_1_sha256_3072_65537_v3_usr_crt.pem
CSF1_1_sha256_3072_65537_v3_usr_crt.pem: OK

openssl verify -CAfile SRK1-CA-chain.pem IMG1_1_sha256_3072_65537_v3_usr_crt.pem
IMG1_1_sha256_3072_65537_v3_usr_crt.pem: OK

Greets,

Satya

Re: OPENSSL to verify CSF & IMG certificates

Yuri — Wed, 12 Jul 2017 09:08:05 GMT

Hello,

Hope the following helps.

https://knowledge.symantec.com/support/mpki-support/index?page=content&id=SO12792&actp=RSS&viewlocale=en_US

Have a great day,
Yuri

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Re: OPENSSL to verify CSF & IMG certificates

satyadamarla — Wed, 12 Jul 2017 10:52:57 GMT

Thanks Yuri.

That is exactly what I did. I combined the certificates of CA and SRK1 into one (CA-SRK1-chain.pem) and then I used that to verify. It worked.

Greetsm

Satya