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Quickest way to get SHA-1 thumbprint of a cert from a SecCertificateRef?

Subject: Quickest way to get SHA-1 thumbprint of a cert from a SecCertificateRef?
From: Nathan Herring <email@hidden>
Date: Tue, 26 Sep 2006 20:38:25 -0700
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Thread-topic: Quickest way to get SHA-1 thumbprint of a cert from a SecCertificateRef?

I could go through the certificate and do the SHA-1 calculation via SecCertificateGetData, CSSM_CreateDigestDataContext, etc., but is there just some key field that I could pull out of the CL layer? From looking at the docs, X509V1Signature looks potentially useful, but perhaps not what I want – the related Signature OIDs (e.g., X509V1SignatureCStruct) don’t appear to have a definition as to what would their format for me to read out of.

Thx,

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