private static BigInteger ImplRandomFieldElementMult(SecureRandom r, BigInteger p)
{
BigInteger x;
do
{
x = BigIntegers.CreateRandomBigInteger(p.BitLength, r);
}while (x.SignValue <= 0 || x.CompareTo(p) >= 0);
return(x);
}
private static BigInteger ImplRandomFieldElementMult(SecureRandom r, int m)
{
BigInteger x;
do
{
x = BigIntegers.CreateRandomBigInteger(m, r);
}while (x.SignValue <= 0);
return(x);
}
public BigInteger[] GenerateSignature(byte[] message)
{
if (!forSigning)
{
throw new InvalidOperationException("not initialized for signing");
}
byte[] mRev = new byte[message.Length]; // conversion is little-endian
for (int i = 0; i != mRev.Length; i++)
{
mRev[i] = message[mRev.Length - 1 - i];
}
BigInteger e = new BigInteger(1, mRev);
ECDomainParameters ec = key.Parameters;
BigInteger n = ec.N;
BigInteger d = ((ECPrivateKeyParameters)key).D;
BigInteger r, s;
ECMultiplier basePointMultiplier = CreateBasePointMultiplier();
do // generate s
{
BigInteger k;
do // generate r
{
do
{
k = BigIntegers.CreateRandomBigInteger(n.BitLength, secureRandom);
}while (k.Equals(BigInteger.Zero)); // ECConstants.ZERO));
ECPoint p = basePointMultiplier.Multiply(ec.G, k).Normalize();
r = p.AffineXCoord.ToBigInteger().Mod(n);
}while (r.Equals(BigInteger.Zero)); // ECConstants.ZERO));
s = (k.Multiply(e)).Add(d.Multiply(r)).Mod(n);
}while (s.Equals(BigInteger.Zero)); // ECConstants.ZERO));
return(new BigInteger[] { r, s });
}
public static byte[] GetSignedCertificate(AlgParSet parameters, Subj subj)
{
X509Certificate root = new X509CertificateParser().ReadCertificate(GetRootCertificate());
Cert data = CreateDatabaseInfoFromCertificate(root);
var keys = GenerateKeyPair(parameters);
string serial = string.Empty;
do
{
serial = BigIntegers.CreateRandomBigInteger(512, new SecureRandom()).ToString();
}while (DatabaseInstance.GetInstance().Certs.FirstOrDefault(elm => elm.SerialNumber_Cert == serial) != null);
Cert certificate = new Cert
{
Ver_Cert = DatabaseInstance.GetInstance().Vers.FirstOrDefault(),
SignAlg_Cert = new SignAlg
{
AlgParSet_SignAlg = parameters,
PrivateKey_SignAlg = PrivateKeyInfoFactory.CreatePrivateKeyInfo(keys.Private).ToAsn1Object().GetEncoded(),
PublicKey_SignAlg = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(keys.Public).ToAsn1Object().GetEncoded()
},
Issuer_Cert = data.Issuer_Cert,
Subj_Cert = subj,
SerialNumber_Cert = serial,
ValidFrom_Cert = DateTime.Now,
ValidBy_Cert = DateTimeOffset.Now.AddYears(5).UtcDateTime,
SignSerialNumber_Cert = data.SerialNumber_Cert
};
var cert = CreateCertificateFromDatabaseInfo(certificate);
certificate.SignValue_Cert = string.Join("", BitConverter.ToString(cert.GetSignature()).Split('-'));
DatabaseInstance.GetInstance().Certs.Add(certificate);
DatabaseInstance.GetInstance().SaveChanges();
return(cert.GetEncoded());
}
public static byte[] GetRootCertificate()
{
Issuer certificationAuthority = GetCurrentCertificationAuthority();
if (certificationAuthority == null)
{
throw new Exception("Cannot find certification authority!");
}
var certificate = DatabaseInstance.GetInstance().Certs
.Include(elm => elm.Ver_Cert)
.Include(elm => elm.SignAlg_Cert).ThenInclude(elm => elm.AlgParSet_SignAlg).ThenInclude(elm => elm.AlgName_AlgParSet)
.Include(elm => elm.SignAlg_Cert).ThenInclude(elm => elm.AlgParSet_SignAlg).ThenInclude(elm => elm.HashType_AlgParSet)
.Include(elm => elm.SignAlg_Cert).ThenInclude(elm => elm.AlgParSet_SignAlg).ThenInclude(elm => elm.Len_AlgParSet)
.Include(elm => elm.Subj_Cert).ThenInclude(elm => elm.Gender_Subj)
.Include(elm => elm.Subj_Cert).ThenInclude(elm => elm.Citizen_Subj)
.Include(elm => elm.Subj_Cert).ThenInclude(elm => elm.City_Subj).ThenInclude(elm => elm.Region_City).ThenInclude(elm => elm.Country_Region)
.Include(elm => elm.Issuer_Cert).ThenInclude(elm => elm.City_Issuer).ThenInclude(elm => elm.Region_City).ThenInclude(elm => elm.Country_Region)
.FirstOrDefault(elm => elm.SerialNumber_Cert == elm.SignSerialNumber_Cert);
if (certificate == null || !IsValid(CreateCertificateFromDatabaseInfo(certificate).GetEncoded()))
{
var par = DatabaseInstance.GetInstance().AlgParSets
.Include(elm => elm.Len_AlgParSet)
.Include(elm => elm.AlgName_AlgParSet)
.Include(elm => elm.HashType_AlgParSet)
.FirstOrDefault(elm => elm.Len_AlgParSet.Value_Len == 256);
var keys = GenerateKeyPair(par);
string serial = string.Empty;
do
{
serial = BigIntegers.CreateRandomBigInteger(512, new SecureRandom()).ToString();
}while (DatabaseInstance.GetInstance().Certs.FirstOrDefault(elm => elm.SerialNumber_Cert == serial) != null);
certificate = new Cert
{
Ver_Cert = DatabaseInstance.GetInstance().Vers.FirstOrDefault(),
SignAlg_Cert = new SignAlg
{
AlgParSet_SignAlg = par,
PrivateKey_SignAlg = PrivateKeyInfoFactory.CreatePrivateKeyInfo(keys.Private).ToAsn1Object().GetEncoded(),
PublicKey_SignAlg = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(keys.Public).ToAsn1Object().GetEncoded()
},
Issuer_Cert = certificationAuthority,
Subj_Cert = new Subj
{
Surname_Subj = "",
Name_Subj = certificationAuthority.Name_Issuer,
BirthDate_Subj = DateTime.Now,
Gender_Subj = DatabaseInstance.GetInstance().Genders.FirstOrDefault(),
Citizen_Subj = DatabaseInstance.GetInstance().Citizens.FirstOrDefault(),
City_Subj = certificationAuthority.City_Issuer,
Phone_Subj = certificationAuthority.Phone_Issuer,
EMail_Subj = certificationAuthority.EMail_Issuer,
PassportSerias_Subj = "",
PassportNumber_Subj = "",
INN_Subj = certificationAuthority.INN_Issuer,
SNILS_Subj = ""
},
SerialNumber_Cert = serial,
ValidFrom_Cert = DateTime.Now,
ValidBy_Cert = DateTimeOffset.Now.AddYears(5).UtcDateTime,
SignSerialNumber_Cert = serial
};
var cert = CreateCertificateFromDatabaseInfo(certificate);
certificate.SignValue_Cert = string.Join("", BitConverter.ToString(cert.GetSignature()).Split('-'));
DatabaseInstance.GetInstance().Certs.Add(certificate);
DatabaseInstance.GetInstance().SaveChanges();
return(cert.GetEncoded());
}
return(CreateCertificateFromDatabaseInfo(certificate).GetEncoded());
}
public override ECFieldElement RandomFieldElement(SecureRandom r)
{
int m = FieldSize;
return(FromBigInteger(BigIntegers.CreateRandomBigInteger(m, r)));
}