public static RSAParameters ReadRSAPublicKey(Stream s)
{
using (StreamReader sR = new StreamReader(s))
{
if (sR.ReadLine() != "-----BEGIN RSA PUBLIC KEY-----")
{
throw new IOException("The data should begin with header: -----BEGIN RSA PUBLIC KEY-----");
}
StringBuilder base64Data = new StringBuilder(2048);
do
{
string line = sR.ReadLine();
if (line == "-----END RSA PUBLIC KEY-----")
{
break;
}
base64Data.Append(line);
}while (true);
return(DEREncoding.DecodeRSAPublicKey(Convert.FromBase64String(base64Data.ToString())));
}
}
public static void WriteRSAPrivateKey(RSAParameters parameters, Stream s)
{
byte[] header = Encoding.UTF8.GetBytes("-----BEGIN RSA PRIVATE KEY-----\n");
byte[] footer = Encoding.UTF8.GetBytes("-----END RSA PRIVATE KEY-----\n");
byte[] base64data;
//get base64 encoded DER formatted data
base64data = Encoding.UTF8.GetBytes(Convert.ToBase64String(DEREncoding.EncodeRSAPrivateKey(parameters)));
//write PEM format
s.Write(header, 0, header.Length);
int offset = 0;
int bytesRemaining = base64data.Length;
int count = 65;
while (bytesRemaining > 0)
{
if (bytesRemaining < count)
{
count = bytesRemaining;
}
s.Write(base64data, offset, count);
s.WriteByte(0x0A);
offset += count;
bytesRemaining -= count;
}
s.Write(footer, 0, footer.Length);
}
public static RSAParameters ReadRSAPrivateKey(Stream s)
{
using (StreamReader sR = new StreamReader(s))
{
if (sR.ReadLine() != "-----BEGIN RSA PRIVATE KEY-----")
{
throw new IOException("The data should begin with header: -----BEGIN RSA PRIVATE KEY-----");
}
StringBuilder base64Data = new StringBuilder(2048);
do
{
string line = sR.ReadLine();
if (line == "-----END RSA PRIVATE KEY-----")
{
break;
}
base64Data.Append(line);
}while (true);
DEREncoding obj = DEREncoding.Decode(Convert.FromBase64String(base64Data.ToString()));
using (Stream sV = obj.GetValueStream())
{
DEREncoding objVer = DEREncoding.Decode(sV);
if (objVer.Value[0] != 0)
{
throw new IOException("Unknown version number for RSA private key data.");
}
DEREncoding objModulus = DEREncoding.Decode(sV);
DEREncoding objExponent = DEREncoding.Decode(sV);
DEREncoding objD = DEREncoding.Decode(sV);
DEREncoding objP = DEREncoding.Decode(sV);
DEREncoding objQ = DEREncoding.Decode(sV);
DEREncoding objDP = DEREncoding.Decode(sV);
DEREncoding objDQ = DEREncoding.Decode(sV);
DEREncoding objInverseQ = DEREncoding.Decode(sV);
RSAParameters parameters = new RSAParameters();
parameters.Modulus = objModulus.GetIntegerValue();
parameters.Exponent = objExponent.GetIntegerValue();
parameters.D = objD.GetIntegerValue();
parameters.P = objP.GetIntegerValue();
parameters.Q = objQ.GetIntegerValue();
parameters.DP = objDP.GetIntegerValue();
parameters.DQ = objDQ.GetIntegerValue();
parameters.InverseQ = objInverseQ.GetIntegerValue();
return(parameters);
}
}
}
public static void WriteRSAPrivateKey(RSAParameters parameters, Stream s)
{
byte[] header = Encoding.UTF8.GetBytes("-----BEGIN RSA PRIVATE KEY-----\n");
byte[] footer = Encoding.UTF8.GetBytes("-----END RSA PRIVATE KEY-----\n");
byte[] base64data;
//encode using DER Encoding
using (MemoryStream derStream = new MemoryStream())
{
using (MemoryStream seqStream = new MemoryStream())
{
DEREncoding.Encode(DEREncodingASN1Type.INTEGER, new byte[] { 0 }, seqStream); //version
DEREncoding.EncodeIntegerValue(parameters.Modulus, seqStream);
DEREncoding.EncodeIntegerValue(parameters.Exponent, seqStream);
DEREncoding.EncodeIntegerValue(parameters.D, seqStream);
DEREncoding.EncodeIntegerValue(parameters.P, seqStream);
DEREncoding.EncodeIntegerValue(parameters.Q, seqStream);
DEREncoding.EncodeIntegerValue(parameters.DP, seqStream);
DEREncoding.EncodeIntegerValue(parameters.DQ, seqStream);
DEREncoding.EncodeIntegerValue(parameters.InverseQ, seqStream);
//write sequence
DEREncoding.Encode(DEREncodingASN1Type.SEQUENCE, seqStream.ToArray(), derStream);
}
//get base64 formatted DER data
base64data = Encoding.UTF8.GetBytes(Convert.ToBase64String(derStream.ToArray()));
}
//write PEM format
s.Write(header, 0, header.Length);
int offset = 0;
int bytesRemaining = base64data.Length;
int count = 65;
while (bytesRemaining > 0)
{
if (bytesRemaining < count)
{
count = bytesRemaining;
}
s.Write(base64data, offset, count);
s.WriteByte(0x0A);
offset += count;
bytesRemaining -= count;
}
s.Write(footer, 0, footer.Length);
}
public static RSAParameters DecodeRSAPublicKey(Stream s)
{
DEREncoding seq = Decode(s);
using (Stream seqStream = seq.GetValueStream())
{
DEREncoding objModulus = Decode(seqStream);
DEREncoding objExponent = Decode(seqStream);
RSAParameters parameters = new RSAParameters();
parameters.Modulus = objModulus.GetIntegerValue();
parameters.Exponent = objExponent.GetIntegerValue();
return(parameters);
}
}
public static RSAParameters DecodeRSAPrivateKey(Stream s)
{
DEREncoding seq = Decode(s);
using (Stream seqStream = seq.GetValueStream())
{
DEREncoding objVer = Decode(seqStream);
if (objVer.Value[0] != 0)
{
throw new IOException("Unknown version number for RSA private key data.");
}
DEREncoding objModulus = Decode(seqStream);
DEREncoding objExponent = Decode(seqStream);
DEREncoding objD = Decode(seqStream);
DEREncoding objP = Decode(seqStream);
DEREncoding objQ = Decode(seqStream);
DEREncoding objDP = Decode(seqStream);
DEREncoding objDQ = Decode(seqStream);
DEREncoding objInverseQ = Decode(seqStream);
RSAParameters parameters = new RSAParameters();
parameters.Modulus = objModulus.GetIntegerValue();
parameters.Exponent = objExponent.GetIntegerValue();
parameters.D = objD.GetIntegerValue();
parameters.P = objP.GetIntegerValue();
parameters.Q = objQ.GetIntegerValue();
parameters.DP = objDP.GetIntegerValue();
parameters.DQ = objDQ.GetIntegerValue();
parameters.InverseQ = objInverseQ.GetIntegerValue();
return(parameters);
}
}
