环境：VS 2019、Core 3.1、C# 8.0
我在尝试将 .cer 和 .key 文件添加到我的 httpClientHandler 时收到以下错误：
{"ASN1 corrupted data."}
Data: {System.Collections.ListDictionaryInternal}
HResult: -2146233087
HelpLink: null
InnerException: null
Message: "ASN1 corrupted data."
Source: "System.Security.Cryptography.Algorithms"
StackTrace: " at System.Security.Cryptography.Asn1.AsnReader.CheckExpectedTag(Asn1Tag tag, Asn1Tag expectedTag, UniversalTagNumber tagNumber)\r\n at System.Security.Cryptography.Asn1.AsnReader.ReadSequence(Asn1Tag expectedTag)\r\n at System.Security.Cryptography.Asn1.RSAPrivateKeyAsn.Decode(AsnReader reader, Asn1Tag expectedTag, RSAPrivateKeyAsn& decoded)\r\n at System.Security.Cryptography.Asn1.RSAPrivateKeyAsn.Decode(Asn1Tag expectedTag, ReadOnlyMemory`1 encoded, AsnEncodingRules ruleSet)\r\n at System.Security.Cryptography.Asn1.RSAPrivateKeyAsn.Decode(ReadOnlyMemory`1 encoded, AsnEncodingRules ruleSet)\r\n at System.Security.Cryptography.RSAKeyFormatHelper.FromPkcs1PrivateKey(ReadOnlyMemory`1 keyData, AlgorithmIdentifierAsn& algId, RSAParameters& ret)\r\n at System.Security.Cryptography.RSA.ImportRSAPrivateKey(ReadOnlySpan`1 source, Int32& bytesRead)\r\n at BnyMellon.Program.CreateFromCertFile(String cerFile, String keyFile) in C:\\Users\\bbernzweig.AD\\source\\repos\\HttpClientExample\\
BnyMellon\\Program.cs:line 150" …不使用第三方BouncyCastle库，是否可以读取自定义私钥并对消息签名？（使用私钥进行sha256哈希+加密）