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Legrandin committed Sep 29, 2024
1 parent 19494e0 commit f108e91
Showing 1 changed file with 11 additions and 0 deletions.
11 changes: 11 additions & 0 deletions lib/Crypto/PublicKey/ECC.py
Original file line number Diff line number Diff line change
Expand Up @@ -826,18 +826,25 @@ def _import_rfc5915_der(encoded, passphrase, curve_oid=None):
# publicKey [1] BIT STRING OPTIONAL
# }

print("************************************************")
print("Processing %d bytes" % len(encoded))

ec_private_key = DerSequence().decode(encoded, nr_elements=(2, 3, 4))
if ec_private_key[0] != 1:
print("Incorrect version")
raise ValueError("Incorrect ECC private key version")

scalar_bytes = DerOctetString().decode(ec_private_key[1]).payload
print("Payload is %d bytes" % scalar_bytes)

next_element = 2

# Try to decode 'parameters'
if next_element < len(ec_private_key):
print("Decoding parameters")
try:
parameters = DerObjectId(explicit=0).decode(ec_private_key[next_element]).value
print("Parameters is", parameters)
if curve_oid is not None and parameters != curve_oid:
raise ValueError("Curve mismatch")
curve_oid = parameters
Expand All @@ -846,19 +853,23 @@ def _import_rfc5915_der(encoded, passphrase, curve_oid=None):
pass

if curve_oid is None:
print("No curve_oid")
raise ValueError("No curve found")

for curve_name, curve in _curves.items():
if curve.oid == curve_oid:
break
else:
print("Unknown curve_oid", curve_oid)
raise UnsupportedEccFeature("Unsupported ECC curve (OID: %s)" % curve_oid)

modulus_bytes = curve.p.size_in_bytes()
if len(scalar_bytes) != modulus_bytes:
print("Small modulus %d bytes", len(modulus_bytes))
raise ValueError("Private key is too small")

# Try to decode 'publicKey'
print("Decode public key")
point_x = point_y = None
if next_element < len(ec_private_key):
try:
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