I have a task to access keys(private) and certificates from iPhone kechain using Openssl, read them and use those keys and certificates to sign, verify, encrypt and decrypt data on the iphone.
I have a task to access keys(private) and certificates from iPhone kechain using Openssl,
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No, you have access only to your local app (apps) keychain. So if you want to use some certificate to authenticate you should install it firstly in your keychain.
But you can check server certificate using iOS SDK (trusted/untrusted server).