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Python: Document x5t certificate thumbprint hashing in Copilot Studio agent #14270

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Merged
SergeyMenshykh merged 2 commits into from
Aug 5, 2026
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Python: Document x5t certificate thumbprint hashing in Copilot Studio agent #14270

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Python: Document x5t certificate thumbprint hashing in Copilot Studio…
SergeyMenshykh Aug 4, 2026
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Potential fix for pull request finding
SergeyMenshykh Aug 4, 2026
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5 changes: 4 additions & 1 deletion python/semantic_kernel/agents/copilot_studio/copilot_studio_agent.py
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Original file line number Diff line number Diff line change
Expand Up @@ -181,7 +181,10 @@ def _cert_thumbprint(cert_path: Path) -> str:

pem_bytes = Path(cert_path).read_bytes()
der_bytes = ssl.PEM_cert_to_DER_cert(pem_bytes.decode())
return hashlib.sha1(der_bytes, usedforsecurity=False).hexdigest().upper()
# SHA-1 is not used here as a security primitive; it is required to compute the X.509 certificate thumbprint
# (the `x5t` JWT header value), which MSAL and Microsoft Entra ID mandate to be a SHA-1 digest for the
# `thumbprint` client credential. Hence the `usedforsecurity=False` flag.
return hashlib.sha1(der_bytes, usedforsecurity=False).hexdigest().upper() # CodeQL [SM02167] x5t thumbprint


# endregion
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