Python加载ERCA PEM公钥失败求助：行驶记录仪签名验证遇错

背景 #

正在开发行驶记录仪文件签名验证功能，根据文档要求，需先使用欧洲ERCA公钥解密章节证书，获取厂商公钥后再验证章节签名，但文档理解难度较高，目前卡在公钥加载环节。

公钥信息 #

我有一份PEM格式的ERCA公钥，内容如下：

------------ BEGIN ERCA PK ---------------
/UVDIAD//wHpgHY6REqVJQqVh4LR1UrPwyPSXzlGuBbpL8+dMrQqJhPRo2O05DUyoCZoYynI
lmPMwAH3J4IGtqtlrShxhIpoD2pX2P2h14LJtYEpA+pbZuKpvh2FvdD9rnakYIjXGmF2sfap
hBkQBCTcVtCEaqPIQ5DTUXoPEZLe3/dAkkzbpwAAAAAAAQAB
------------ END ERCA PK ---------------

加载代码 #

使用以下Python代码加载公钥：

file = open(".\\dddfiles\\EC_PK\\EC_PK.pem", 'rb')
b = file.read()
file.close()
rsa.PublicKey.load_pkcs1_openssl_der(b)

触发错误 #

运行代码后抛出如下错误：

File "C:\Users\Oscar\Documents\QanALL_CMD_Tools\src\ddd_parser.py", line 97, in <module>
    _7601_.validate()
  File "C:\Users\Oscar\Documents\QanALL_CMD_Tools\src\parser7601.py", line 89, in validate
    rsa.PublicKey.load_pkcs1_openssl_der(b)
  File "C:\Users\Oscar\AppData\Roaming\Python\Python311\site-packages\rsa\key.py", line 375, in load_pkcs1_openssl_der
    (keyinfo, _) = decoder.decode(keyfile, asn1Spec=OpenSSLPubKey())
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Oscar\AppData\Roaming\Python\Python311\site-packages\pyasn1\codec\ber\decoder.py", line 1618, in __call__
    raise error.PyAsn1Error(
pyasn1.error.PyAsn1Error: <TagSet object, tags 0:32:13> not in asn1Spec: <OpenSSLPubKey schema object, tagSet=<TagSet object, tags 0:32:16>, subtypeSpec=<ConstraintsIntersection object>, componentType=<NamedTypes object, types <NamedType object, type header=<PubKeyHeader schema object, tagSet=<TagSet object, tags 0:32:16>, subtypeSpec=<ConstraintsIntersection object>, componentType=<NamedTypes object, types <NamedType object, type oid=<ObjectIdentifier schema object, tagSet <TagSet object, tags 0:0:6>>>, <NamedType object, type parameters=<Null schema object, tagSet <TagSet object, tags 0:0:5>, subtypeSpec <ConstraintsIntersection object, consts <SingleValueConstraint object, consts b''>>, encoding iso-8859-1>>>, sizeSpec=<ConstraintsIntersection object>>>, <NamedType object, type key=<OctetString schema object, tagSet <TagSet object, tags 0:0:3>, encoding iso-8859-1>>>, sizeSpec=<ConstraintsIntersection object>>

已尝试方法 #

• 将公钥保存为BIN格式文件加载
• 将公钥保存为TXT格式文件加载

以上方法均无法解决问题，恳请提供可行的解决方案。

内容的提问来源于stack exchange，提问作者Oscar K