/// <summary>读取PEM文件到RSA参数</summary>
/// <param name="content"></param>
/// <returns></returns>
public static ECKey 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 = Asn1.Read(data);
var keys = asn.Value as Asn1[];
// Algorithm(algorithm + parameters)
var oids = asn.GetOids();
var algorithm = oids[0];
var parameters = oids[1];
if (algorithm.FriendlyName != "ECC")
{
throw new InvalidDataException($"Invalid key {algorithm}");
}
keys = Asn1.Read(keys[2].Value as Byte[]).Value as Asn1[];
// 里面是一个字节前缀，后面X+Y
var k2 = Asn1.Read(keys[2].Value as Byte[]).Value as Byte[];
var len = (k2.Length - 1) / 2;
// 参数
var ek = new ECKey
{
D = keys[1].Value as Byte[],
X = k2.ReadBytes(1, len),
Y = k2.ReadBytes(1 + len, len),
};
ek.SetAlgorithm(parameters, true);
return(ek);
}
else
{
content = content.Replace("-----BEGIN PUBLIC KEY-----", null)
.Replace("-----END PUBLIC KEY-----", null)
.Replace("\n", null).Replace("\r", null);
var data = Convert.FromBase64String(content);
var asn = Asn1.Read(data);
var keys = asn.Value as Asn1[];
// Algorithm(algorithm + parameters)
var oids = asn.GetOids();
var algorithm = oids[0];
var parameters = oids[1];
if (algorithm.FriendlyName != "ECC")
{
throw new InvalidDataException($"Invalid key {algorithm}");
}
// 里面是一个字节前缀，后面X+Y
var k2 = keys[1].Value as Byte[];
var len = (k2.Length - 1) / 2;
// 参数
var ek = new ECKey
{
X = k2.ReadBytes(1, len),
Y = k2.ReadBytes(1 + len, len),
};
ek.SetAlgorithm(parameters, false);
return(ek);
}
}
/// <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 = Asn1.Read(data);
var keys = asn.Value as Asn1[];
// 可能直接key，也可能有Oid包装
var oids = asn.GetOids();
if (oids.Any(e => e.FriendlyName == "RSA"))
{
keys = Asn1.Read(keys[2].Value as Byte[]).Value as Asn1[];
}
// 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 = Asn1.Read(data);
var keys = asn.Value as Asn1[];
// 可能直接key，也可能有Oid包装
var oids = asn.GetOids();
if (oids.Any(e => e.FriendlyName == "RSA"))
{
keys = Asn1.Read(keys.FirstOrDefault(e => e.Tag == Asn1Tags.BitString).Value as Byte[]).Value as Asn1[];
}
// 参数数据
return(new RSAParameters
{
Modulus = keys[0].GetByteArray(true),
Exponent = keys[1].GetByteArray(false),
});
}
}