/// <summary>读取PEM文件到RSA参数</summary>
/// <param name="content"></param>
/// <returns></returns>
public static RSAParameters ReadPem(String content)
{
if (String.IsNullOrEmpty(content))
{
throw new ArgumentNullException(nameof(content));
}
// 公钥私钥分别处理
content = content.Trim();
if (content.StartsWithIgnoreCase("-----BEGIN RSA PRIVATE KEY-----", "-----BEGIN PRIVATE KEY-----"))
{
var content2 = content.TrimStart("-----BEGIN RSA PRIVATE KEY-----")
.TrimEnd("-----END RSA PRIVATE KEY-----")
.TrimStart("-----BEGIN PRIVATE KEY-----")
.TrimEnd("-----END PRIVATE KEY-----")
.Replace("\n", null).Replace("\r", null);
var data = Convert.FromBase64String(content2);
// PrivateKeyInfo: version + Algorithm(algorithm + parameters) + privateKey
var asn = Asn1Util.Read(data);
var keys = asn.Value as Asn1Util[];
// 可能直接key，也可能有Oid包装
var oids = asn.GetOids();
if (oids.Any(e => e.FriendlyName == "RSA"))
{
keys = Asn1Util.Read(keys[2].Value as Byte[]).Value as Asn1Util[];
}
// 参数数据
return(new RSAParameters
{
Modulus = keys[1].GetByteArray(true),
Exponent = keys[2].GetByteArray(false),
D = keys[3].GetByteArray(true),
P = keys[4].GetByteArray(true),
Q = keys[5].GetByteArray(true),
DP = keys[6].GetByteArray(true),
DQ = keys[7].GetByteArray(true),
InverseQ = keys[8].GetByteArray(true)
});
}
else
{
content = content.Replace("-----BEGIN PUBLIC KEY-----", null)
.Replace("-----END PUBLIC KEY-----", null)
.Replace("\n", null).Replace("\r", null);
var data = Convert.FromBase64String(content);
var asn = Asn1Util.Read(data);
var keys = asn.Value as Asn1Util[];
// 可能直接key，也可能有Oid包装
var oids = asn.GetOids();
if (oids.Any(e => e.FriendlyName == "RSA"))
{
keys = Asn1Util.Read(keys.FirstOrDefault(e => e.Tag == Asn1Tags.BitString).Value as Byte[]).Value as Asn1Util[];
}
// 参数数据
return(new RSAParameters
{
Modulus = keys[0].GetByteArray(true),
Exponent = keys[1].GetByteArray(false),
});
}
}
/// <summary>读取对象</summary>
/// <param name="reader"></param>
/// <returns></returns>
public static Asn1Util Read(BinaryReader reader)
{
var len = ReadTLV(reader, out var tag);
if (len < 0)
{
return(null);
}
var asn = new Asn1Util {
Length = len
};
var tagNo = tag & 0x1F;
//if (tagNo == 0x1F) tagNo = reader.BaseStream.ReadEncodedInt();
// isConstructed
asn.Tag = (Asn1Tags)tagNo;
if ((tag & (Byte)Asn1Tags.Constructed) != 0)
{
switch (asn.Tag)
{
case Asn1Tags.OctetString:
break;
case Asn1Tags.External:
break;
case Asn1Tags.Sequence:
var reader2 = new BinaryReader(new MemoryStream(reader.ReadBytes(len)));
var list = new List <Asn1Util>();
while (true)
{
var obj = Read(reader2);
if (obj == null)
{
break;
}
list.Add(obj);
}
asn.Value = list.ToArray();
return(asn);
case Asn1Tags.Set:
break;
}
}
// 基础类型
var buf = reader.ReadBytes(len);
asn.Value = buf;
switch (asn.Tag)
{
case Asn1Tags.Boolean:
break;
case Asn1Tags.Integer:
asn.Value = buf;
break;
case Asn1Tags.BitString:
if (buf.Length > 0 && buf[0] == 0)
{
buf = buf.ReadBytes(1);
}
asn.Value = buf;
break;
case Asn1Tags.OctetString:
asn.Value = buf;
break;
case Asn1Tags.Null:
break;
case Asn1Tags.ObjectIdentifier:
//asn.Value = reader.ReadBytes(len);
asn.Value = new Oid(MakeOidStringFromBytes(buf));
break;
case Asn1Tags.External:
break;
case Asn1Tags.Enumerated:
break;
//case Asn1Tags.Sequence:
// break;
//case Asn1Tags.SequenceOf:
// break;
case Asn1Tags.Set:
break;
//case Asn1Tags.SetOf:
// break;
case Asn1Tags.NumericString:
break;
case Asn1Tags.PrintableString:
break;
case Asn1Tags.T61String:
break;
case Asn1Tags.VideotexString:
break;
case Asn1Tags.IA5String:
break;
case Asn1Tags.UtcTime:
break;
case Asn1Tags.GeneralizedTime:
break;
case Asn1Tags.GraphicString:
break;
case Asn1Tags.VisibleString:
break;
case Asn1Tags.GeneralString:
break;
case Asn1Tags.UniversalString:
break;
case Asn1Tags.BmpString:
break;
case Asn1Tags.Utf8String:
break;
case Asn1Tags.Constructed:
break;
case Asn1Tags.Application:
break;
case Asn1Tags.Tagged:
break;
default:
break;
}
return(asn);
}
