public bool verify(byte[] sig)
{
cs.Close();
System.Security.Cryptography.DSACryptoServiceProvider DSA = new System.Security.Cryptography.DSACryptoServiceProvider();
DSA.ImportParameters(DSAKeyInfo);
System.Security.Cryptography.DSASignatureDeformatter DSADeformatter = new System.Security.Cryptography.DSASignatureDeformatter(DSA);
DSADeformatter.SetHashAlgorithm("SHA1");
long i=0;
long j=0;
byte[] tmp;
//This makes sure sig is always 40 bytes?
if(sig[0]==0 && sig[1]==0 && sig[2]==0)
{
long i1 = (sig[i++]<<24)&0xff000000;
long i2 = (sig[i++]<<16)&0x00ff0000;
long i3 = (sig[i++]<<8)&0x0000ff00;
long i4 = (sig[i++])&0x000000ff;
j = i1 | i2 | i3 | i4;
i+=j;
i1 = (sig[i++]<<24)&0xff000000;
i2 = (sig[i++]<<16)&0x00ff0000;
i3 = (sig[i++]<<8)&0x0000ff00;
i4 = (sig[i++])&0x000000ff;
j = i1 | i2 | i3 | i4;
tmp=new byte[j];
Array.Copy(sig, i, tmp, 0, j); sig=tmp;
}
bool res = DSADeformatter.VerifySignature(sha1, sig);
return res;
}
public byte[] sign()
{
//byte[] sig=signature.sign();
cs.Close();
System.Security.Cryptography.DSACryptoServiceProvider DSA = new System.Security.Cryptography.DSACryptoServiceProvider();
DSA.ImportParameters(DSAKeyInfo);
System.Security.Cryptography.DSASignatureFormatter DSAFormatter = new System.Security.Cryptography.DSASignatureFormatter(DSA);
DSAFormatter.SetHashAlgorithm("SHA1");
byte[] sig = DSAFormatter.CreateSignature(sha1);
return(sig);
}
public byte[] sign()
{
//byte[] sig=signature.sign();
cs.Close();
System.Security.Cryptography.DSACryptoServiceProvider DSA = new System.Security.Cryptography.DSACryptoServiceProvider();
DSA.ImportParameters(DSAKeyInfo);
System.Security.Cryptography.DSASignatureFormatter DSAFormatter = new System.Security.Cryptography.DSASignatureFormatter(DSA);
DSAFormatter.SetHashAlgorithm("SHA1");
byte[] sig =DSAFormatter.CreateSignature( sha1 );
return sig;
}
public bool verify(byte[] sig)
{
cs.Close();
System.Security.Cryptography.DSACryptoServiceProvider DSA = new System.Security.Cryptography.DSACryptoServiceProvider();
DSA.ImportParameters(DSAKeyInfo);
System.Security.Cryptography.DSASignatureDeformatter DSADeformatter = new System.Security.Cryptography.DSASignatureDeformatter(DSA);
DSADeformatter.SetHashAlgorithm("SHA1");
long i = 0;
long j = 0;
byte[] tmp;
//This makes sure sig is always 40 bytes?
if (sig[0] == 0 && sig[1] == 0 && sig[2] == 0)
{
long i1 = (sig[i++] << 24) & 0xff000000;
long i2 = (sig[i++] << 16) & 0x00ff0000;
long i3 = (sig[i++] << 8) & 0x0000ff00;
long i4 = (sig[i++]) & 0x000000ff;
j = i1 | i2 | i3 | i4;
i += j;
i1 = (sig[i++] << 24) & 0xff000000;
i2 = (sig[i++] << 16) & 0x00ff0000;
i3 = (sig[i++] << 8) & 0x0000ff00;
i4 = (sig[i++]) & 0x000000ff;
j = i1 | i2 | i3 | i4;
tmp = new byte[j];
Array.Copy(sig, i, tmp, 0, j);
sig = tmp;
}
bool res = DSADeformatter.VerifySignature(sha1, sig);
return(res);
}
//This method will probably won't work, we need to get rid of the ASN.1 format (Tamir)
public byte[] sign()
{
//byte[] sig=signature.sign();
cs.Close();
System.Security.Cryptography.DSACryptoServiceProvider DSA = new System.Security.Cryptography.DSACryptoServiceProvider();
DSA.ImportParameters(DSAKeyInfo);
System.Security.Cryptography.DSASignatureFormatter DSAFormatter = new System.Security.Cryptography.DSASignatureFormatter(DSA);
DSAFormatter.SetHashAlgorithm("SHA1");
byte[] sig =DSAFormatter.CreateSignature( sha1 );
/*
System.out.print("sign["+sig.length+"] ");
for(int i=0; i<sig.length;i++){
System.out.print(Integer.toHexString(sig[i]&0xff)+":");
}
System.out.println("");
*/
// sig is in ASN.1
// SEQUENCE::={ r INTEGER, s INTEGER }
int len=0;
int index=3;
len=sig[index++]&0xff;
//System.out.println("! len="+len);
byte[] r=new byte[len];
Array.Copy(sig, index, r, 0, r.Length);
index=index+len+1;
len=sig[index++]&0xff;
//System.out.println("!! len="+len);
byte[] s=new byte[len];
Array.Copy(sig, index, s, 0, s.Length);
byte[] result=new byte[40];
// result must be 40 bytes, but length of r and s may not be 20 bytes
Array.Copy(r, (r.Length>20)?1:0,
result, (r.Length>20)?0:20-r.Length,
(r.Length>20)?20:r.Length);
Array.Copy(s, (s.Length>20)?1:0,
result, (s.Length>20)?20:40-s.Length,
(s.Length>20)?20:s.Length);
// System.arraycopy(sig, (sig[3]==20?4:5), result, 0, 20);
// System.arraycopy(sig, sig.length-20, result, 20, 20);
return result;
}
public bool verify(byte[] sig)
{
cs.Close();
System.Security.Cryptography.DSACryptoServiceProvider DSA = new System.Security.Cryptography.DSACryptoServiceProvider();
DSA.ImportParameters(DSAKeyInfo);
System.Security.Cryptography.DSASignatureDeformatter DSADeformatter = new System.Security.Cryptography.DSASignatureDeformatter(DSA);
DSADeformatter.SetHashAlgorithm("SHA1");
int i=0;
int j=0;
byte[] tmp;
if(sig[0]==0 && sig[1]==0 && sig[2]==0)
{
j=(int)((sig[i++]<<24)&0xff000000)|(byte)((sig[i++]<<16)&0x00ff0000)|(byte)
((sig[i++]<<8)&0x0000ff00)|(byte)((sig[i++])&0x000000ff);
i+=j;
j=(int)((sig[i++]<<24)&0xff000000)|(byte)((sig[i++]<<16)&0x00ff0000)|(byte)
((sig[i++]<<8)&0x0000ff00)|(byte)((sig[i++])&0x000000ff);
tmp=new byte[j];
Array.Copy(sig, i, tmp, 0, j); sig=tmp;
}
// // ASN.1
// int frst=((sig[0]&0x80)!=0?1:0);
// int scnd=((sig[20]&0x80)!=0?1:0);
// //System.out.println("frst: "+frst+", scnd: "+scnd);
//
// int length=sig.Length+6+frst+scnd;
// tmp=new byte[length];
// tmp[0]=(byte)0x30; tmp[1]=(byte)0x2c;
// tmp[1]+=(byte)frst; tmp[1]+=(byte)scnd;
// tmp[2]=(byte)0x02; tmp[3]=(byte)0x14;
// tmp[3]+=(byte)frst;
// Array.Copy(sig, 0, tmp, 4+frst, 20);
// tmp[4+tmp[3]]=(byte)0x02; tmp[5+tmp[3]]=(byte)0x14;
// tmp[5+tmp[3]]+=(byte)scnd;
// Array.Copy(sig, 20, tmp, 6+tmp[3]+scnd, 20);
// sig=tmp;
/*
tmp=new byte[sig.length+6];
tmp[0]=(byte)0x30; tmp[1]=(byte)0x2c;
tmp[2]=(byte)0x02; tmp[3]=(byte)0x14;
System.arraycopy(sig, 0, tmp, 4, 20);
tmp[24]=(byte)0x02; tmp[25]=(byte)0x14;
System.arraycopy(sig, 20, tmp, 26, 20); sig=tmp;
*/
//return signature.verify(sig);
//Console.WriteLine("Sig Length = "+sig.Length);
//bool res = DSADeformatter.VerifySignature(sha1, Util.FixDsaSig2(sig));
bool res = DSADeformatter.VerifySignature(sha1, sig);
return res;
}