19 lines
492 B
Python
Executable File
19 lines
492 B
Python
Executable File
#!/usr/bin/env python3
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"""DANE's SPKI hash calculator
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"""
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from base64 import standard_b64decode
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from hashlib import sha256
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import sys
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from pygost.asn1schemas.x509 import Certificate
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lines = sys.stdin.read().split("-----")
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idx = lines.index("BEGIN CERTIFICATE")
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if idx == -1:
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raise ValueError("PEM has no CERTIFICATE")
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cert_raw = standard_b64decode(lines[idx + 1])
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cert = Certificate().decod(cert_raw)
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print(sha256(cert["tbsCertificate"]["subjectPublicKeyInfo"].encode()).hexdigest())
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