private byte[] RSAExport(RSAParam key, eRSAKeyFormat format)
{
RSAWriter writer = new RSAWriter();
/* output key type */
writer.WriteByte((byte)format);
/* output modulus and exponent*/
writer.WriteBignum(key.Modulus);
writer.WriteBignum(key.Exponent);
if (format == eRSAKeyFormat.PK_PRIVATE_OPTIMIZED || format == eRSAKeyFormat.PK_PRIVATE)
{
writer.WriteBignum(key.D);
}
if (format == eRSAKeyFormat.PK_PRIVATE_OPTIMIZED)
{
writer.WriteBignum(key.DQ);
writer.WriteBignum(key.DP);
writer.WriteBignum(key.pQ);
writer.WriteBignum(key.qP);
writer.WriteBignum(key.P);
writer.WriteBignum(key.Q);
}
return(writer.GetBuffer());
}
public bool RSAImport(byte[] exportedkey)
{
RSAReader reader = new RSAReader(exportedkey);
eRSAKeyFormat format = (eRSAKeyFormat)reader.ReadByte();
RSAParam key = new RSAParam();
/* input modulus and exponent*/
key.Modulus = reader.ReadBignum();
key.Exponent = reader.ReadBignum();
if (format == eRSAKeyFormat.PK_PRIVATE_OPTIMIZED || format == eRSAKeyFormat.PK_PRIVATE)
{
key.D = reader.ReadBignum();
}
if (format == eRSAKeyFormat.PK_PRIVATE_OPTIMIZED)
{
key.DQ = reader.ReadBignum();
key.DP = reader.ReadBignum();
key.pQ = reader.ReadBignum();
key.qP = reader.ReadBignum();
key.P = reader.ReadBignum();
key.Q = reader.ReadBignum();
}
//skip version at end of buffer
this.ImportParam(key);
return(true);
}
//for that it s strange because it s a quite different of DecryptValue and encryptvalue
//but maybe it s the same thanks to math ;)
//so need to do some math to check...
public byte[] RSAExptmod(byte[] PacketIn, eRSAKeyFormat format)
{
BigInteger tmp, tmpa, tmpb;
//todo more check key generate format packet in and out null...
tmp = new BigInteger(PacketIn);
/* are we using the private exponent */
if (format == eRSAKeyFormat.PK_PRIVATE)
{
// m1 = c^dp mod p
tmpa = tmp.ModPow(dp, p);
tmpb = tmp.ModPow(dq, q);
tmp = (tmpa * qP + tmpb * pQ).ModPow(0, n);
}
else
{
tmp = tmp.ModPow(e, n);
}
/* convert it */
return(tmp.GetBytes());
}
public byte[] Export(eRSAKeyFormat type)
{
RSAWriter writer = new RSAWriter();
byte[] exported_key_buffer;
/* store packet header */
/* store version number */
writer.WriteByte(0x91);
writer.WriteByte(0x00); //low endian of version
/* store section and subsection */
writer.WriteByte(0x00);
writer.WriteByte(0x00);
RSAParam param = this.ExportParam(false);
exported_key_buffer = RSAExport(param, eRSAKeyFormat.PK_PRIVATE_OPTIMIZED);
int outlen = exported_key_buffer.Length;
writer.WriteShort((ushort)outlen);
writer.WriteShort((ushort)outlen); //need to be get out?
writer.Write(exported_key_buffer, 0, exported_key_buffer.Length);
//protocole version
writer.WriteByte(0);
writer.WriteByte(0);
writer.WriteByte(0);
writer.WriteByte(1);
writer.WriteByte(0);
writer.WriteByte(1);
return(writer.GetBuffer());
}
private byte[] RSAExport(RSAParam key,eRSAKeyFormat format)
{
RSAWriter writer = new RSAWriter();
/* output key type */
writer.WriteByte((byte)format);
/* output modulus and exponent*/
writer.WriteBignum(key.Modulus);
writer.WriteBignum(key.Exponent);
if (format == eRSAKeyFormat.PK_PRIVATE_OPTIMIZED || format == eRSAKeyFormat.PK_PRIVATE)
{
writer.WriteBignum(key.D);
}
if (format == eRSAKeyFormat.PK_PRIVATE_OPTIMIZED)
{
writer.WriteBignum(key.DQ);
writer.WriteBignum(key.DP);
writer.WriteBignum(key.pQ);
writer.WriteBignum(key.qP);
writer.WriteBignum(key.P);
writer.WriteBignum(key.Q);
}
return writer.GetBuffer();
}
//for that it s strange because it s a quite different of DecryptValue and encryptvalue
//but maybe it s the same thanks to math ;)
//so need to do some math to check...
public byte[] RSAExptmod(byte[] PacketIn, eRSAKeyFormat format)
{
BigInteger tmp, tmpa, tmpb;
//todo more check key generate format packet in and out null...
tmp = new BigInteger(PacketIn);
/* are we using the private exponent */
if (format == eRSAKeyFormat.PK_PRIVATE )
{
// m1 = c^dp mod p
tmpa = tmp.ModPow (dp, p);
tmpb = tmp.ModPow (dq, q);
tmp = (tmpa * qP + tmpb*pQ).ModPow (0, n);
}
else
{
tmp = tmp.ModPow (e, n);
}
/* convert it */
return tmp.GetBytes();
}
public byte[] Export(eRSAKeyFormat type)
{
RSAWriter writer = new RSAWriter();
byte[] exported_key_buffer;
/* store packet header */
/* store version number */
writer.WriteByte(0x91);
writer.WriteByte(0x00);//low endian of version
/* store section and subsection */
writer.WriteByte(0x00);
writer.WriteByte(0x00);
RSAParam param = this.ExportParam(false);
exported_key_buffer = RSAExport(param,eRSAKeyFormat.PK_PRIVATE_OPTIMIZED);
int outlen = exported_key_buffer.Length;
writer.WriteShort((ushort)outlen);
writer.WriteShort((ushort)outlen);//need to be get out?
writer.Write(exported_key_buffer, 0, exported_key_buffer.Length);
//protocole version
writer.WriteByte(0);
writer.WriteByte(0);
writer.WriteByte(0);
writer.WriteByte(1);
writer.WriteByte(0);
writer.WriteByte(1);
return writer.GetBuffer();
}
