public static void MyClassInitialize(TestContext testContext)
{
//
// generate issuer parameters
//
IssuerSetupParameters isp = new IssuerSetupParameters(maxNumberOfAttributes);
isp.UidP = new byte[] { (byte)0 };
//isp.NumberOfAttributes = 1;
isp.E = new byte[] { (byte)0 }; // encode xid directly has an
IssuerKeyAndParameters ikap = isp.Generate();
ip = ikap.IssuerParameters;
//
// issue a token
//
xid = ip.Gq.FieldZq.GetRandomElement(false);
IssuerProtocolParameters ipp = new IssuerProtocolParameters(ikap);
ProverProtocolParameters ppp = new ProverProtocolParameters(ip);
attributes = new byte[][] { xid.ToByteArray() };
ipp.Attributes = ppp.Attributes = attributes;
ipp.NumberOfTokens = ppp.NumberOfTokens = 1;
Issuer issuer = ipp.CreateIssuer();
Prover prover = ppp.CreateProver();
upkt = prover.GenerateTokens(issuer.GenerateThirdMessage(prover.GenerateSecondMessage(issuer.GenerateFirstMessage())))[0];
}
/// <summary>
/// Returns an array of Zero and One FieldZqElements, in Small Endian notation.
/// So sum result[i] * 2^i = integer. If decompositionLength is too short,
/// returns the minimum length array with the correct decomposition.
/// </summary>
/// <param name="integer">Integer to decompose</param>
/// <param name="decompositionLength">Minimum number of bits.</param>
/// <param name="fieldZq">Field</param>
/// <returns></returns>
public static BitArray GetBitDecomposition(FieldZqElement integer, int decompositionLength, FieldZq fieldZq)
{
// get bit array
BitArray bits = new BitArray(VerifierBitDecompositionParameters.Reverse(integer.ToByteArray()));
// compute minimum decompositionLength
if ((decompositionLength < IndexOfMostSignificantNonZeroBit(bits) + 1))
{
decompositionLength = IndexOfMostSignificantNonZeroBit(bits) + 1;
}
// translate bits into array of FieldZqElements
BitArray bitDecomposition = new BitArray(decompositionLength);
for (int bitIndex = 0; bitIndex < bitDecomposition.Length; ++bitIndex)
{
if ((bitIndex < bits.Length) && bits.Get(bitIndex))
{
bitDecomposition.Set(bitIndex, true);
}
else
{
bitDecomposition.Set(bitIndex, false);
}
}
return(bitDecomposition);
}
/// <summary>
/// Convert a FieldElement to a base64 representation.
/// </summary>
/// <param name="fieldElement">The value to convert.</param>
/// <returns>The base64 representation.</returns>
public static String ToBase64String(this FieldZqElement fieldElement)
{
if (fieldElement == null)
{
return(null);
}
return(Convert.ToBase64String(fieldElement.ToByteArray()));
}
/// <summary>
/// Hash a FieldZqElement.
/// </summary>
/// <param name="value">A field Zq element to be hashed.</param>
public void Hash(FieldZqElement value)
{
if (value == null)
{
HashNull();
return;
}
Hash(value.ToByteArray());
}
public void EncodingTest()
{
// a large value
byte[] modulus = new byte[] {
0xef, 0x09, 0x90, 0x06, 0x1d, 0xb6, 0x7a, 0x9e,
0xae, 0xba, 0x26, 0x5f, 0x1b, 0x8f, 0xa1, 0x2b,
0x55, 0x33, 0x90, 0xa8, 0x17, 0x5b, 0xcb, 0x3d,
0x0c, 0x2e, 0x5e, 0xe5, 0xdf, 0xb8, 0x26, 0xe2,
0x29, 0xad, 0x37, 0x43, 0x11, 0x48, 0xce, 0x31,
0xf8, 0xb0, 0xe5, 0x31, 0x77, 0x7f, 0x19, 0xc1,
0xe3, 0x81, 0xc6, 0x23, 0xe6, 0x00, 0xbf, 0xf7,
0xc5, 0x5a, 0x23, 0xa8, 0xe6, 0x49, 0xcc, 0xbc,
0xf8, 0x33, 0xf2, 0xdb, 0xa9, 0x9e, 0x6a, 0xd6,
0x6e, 0x52, 0x37, 0x8e, 0x92, 0xf7, 0x49, 0x2b,
0x24, 0xff, 0x8c, 0x1e, 0x6f, 0xb1, 0x89, 0xfa,
0x84, 0x34, 0xf5, 0x40, 0x2f, 0xe4, 0x15, 0x24,
0x9a, 0xe0, 0x2b, 0xf9, 0x2b, 0x3e, 0xd8, 0xea,
0xaa, 0xa2, 0x20, 0x2e, 0xc3, 0x41, 0x7b, 0x20,
0x79, 0xda, 0x4f, 0x35, 0xe9, 0x85, 0xbb, 0x42,
0xa4, 0x21, 0xcf, 0xab, 0xa8, 0x16, 0x0b, 0x66,
0x94, 0x99, 0x83, 0x38, 0x4e, 0x56, 0x36, 0x5a,
0x44, 0x86, 0xc0, 0x46, 0x22, 0x9f, 0xc8, 0xc8,
0x18, 0xf9, 0x30, 0xb8, 0x0a, 0x60, 0xd6, 0xc2,
0xc2, 0xe2, 0x0c, 0x5d, 0xf8, 0x80, 0x53, 0x4d,
0x42, 0x40, 0xd0, 0xd8, 0x1e, 0x9a, 0x37, 0x0e,
0xef, 0x67, 0x6a, 0x1c, 0x3b, 0x0e, 0xd1, 0xd8,
0xff, 0x30, 0x34, 0x0a, 0x96, 0xb2, 0x1b, 0x89,
0xf6, 0x9c, 0x54, 0xce, 0xb8, 0xf3, 0xdf, 0x17,
0xe3, 0x1b, 0xc2, 0x0c, 0x5b, 0x60, 0x1e, 0x99,
0x44, 0x45, 0xa1, 0xd3, 0x47, 0xa4, 0x5d, 0x95,
0xf4, 0x1a, 0xe0, 0x71, 0x76, 0xc7, 0x38, 0x0c,
0x60, 0xdb, 0x2a, 0xce, 0xdd, 0xee, 0xda, 0x5c,
0x59, 0x80, 0x96, 0x43, 0x62, 0xe3, 0xa8, 0xdd,
0x3f, 0x97, 0x3d, 0x6d, 0x4b, 0x24, 0x1b, 0xcf,
0x91, 0x0c, 0x7f, 0x7a, 0x02, 0xed, 0x3b, 0x60,
0x38, 0x3a, 0x01, 0x02, 0xd8, 0x06, 0x0c, 0x27
};
FieldZq field = FieldZq.CreateFieldZq(modulus);
for (int i = 0; i < 20; i++)
{
FieldZqElement r = field.GetRandomElement(false);
FieldZqElement r2 = field.GetElement(r.ToByteArray());
Assert.AreEqual <FieldZqElement>(r, r2);
}
}
