From 9d2dc7cc3b2f43eea418d26146713b0692e741fe Mon Sep 17 00:00:00 2001
From: Helder Eijs <helderijs@gmail.com>
Date: Sun, 29 Sep 2024 21:46:22 +0200
Subject: [PATCH] Debug

---
 .github/workflows/wheels.yml |  2 +-
 lib/Crypto/PublicKey/ECC.py  | 13 +++++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/wheels.yml b/.github/workflows/wheels.yml
index 3c541d8b..487a1e26 100644
--- a/.github/workflows/wheels.yml
+++ b/.github/workflows/wheels.yml
@@ -78,7 +78,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ ubuntu-20.04, windows-latest, macos-12 ]
+        os: [ ubuntu-20.04, macos-12 ]
         arch: [ multi-arch ]
         # Python 2 on Windows requires manual toolchain setup (per-arch) due to newer MSVC used here
         exclude:
diff --git a/lib/Crypto/PublicKey/ECC.py b/lib/Crypto/PublicKey/ECC.py
index cd674f83..3d64a5a3 100644
--- a/lib/Crypto/PublicKey/ECC.py
+++ b/lib/Crypto/PublicKey/ECC.py
@@ -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" % len(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
@@ -846,23 +853,28 @@ 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'
     point_x = point_y = None
     if next_element < len(ec_private_key):
         try:
+            print("Decode public key I")
             public_key_enc = DerBitString(explicit=1).decode(ec_private_key[next_element]).value
+            print("Decode public key II")
             public_key = _import_public_der(public_key_enc, curve_oid=curve_oid)
             point_x = public_key.pointQ.x
             point_y = public_key.pointQ.y
@@ -870,6 +882,7 @@ def _import_rfc5915_der(encoded, passphrase, curve_oid=None):
         except ValueError:
             pass
 
+    print("Build private key")
     d = Integer.from_bytes(scalar_bytes)
     return construct(curve=curve_name, d=d, point_x=point_x, point_y=point_y)