private static bool Secp256K1EcdsaSignRecoverable(Context ctx, EcdsaRecoverableSignature signature, byte[] msg32, byte[] seckey, NonceFunction noncefp, byte[] noncedata)
{
if (ctx == null || msg32 == null || signature == null || seckey == null)
{
throw new NullReferenceException();
}
if (!EcMultGen.ContextIsBuilt(ctx.EcMultGenCtx))
{
throw new ArithmeticException();
}
if (noncefp == null)
{
noncefp = Secp256K1T.NonceFunctionDefault;
}
Scalar r, s;
Scalar sec, non, msg;
byte recid = 1;
bool ret = false;
var overflow = false;
sec = new Scalar();
Scalar.SetB32(sec, seckey, ref overflow);
r = new Scalar();
s = new Scalar();
/* Fail if the secret key is invalid. */
if (!overflow && !Scalar.IsZero(sec))
{
var nonce32 = new byte[32];
uint count = 0;
msg = new Scalar();
Scalar.SetB32(msg, msg32);
non = new Scalar();
while (true)
{
ret = noncefp(nonce32, msg32, seckey, null, noncedata, count);
if (!ret)
{
break;
}
Scalar.SetB32(non, nonce32, ref overflow);
if (!Scalar.IsZero(non) && !overflow)
{
if (Secp256K1EcdsaSigSign(ctx.EcMultGenCtx, r, s, sec, msg, non, out recid))
{
break;
}
}
count++;
}
Util.MemSet(nonce32, 0, 32); //memset(nonce32, 0, 32);
Scalar.Clear(msg);
Scalar.Clear(non);
Scalar.Clear(sec);
}
if (ret)
{
Secp256K1EcdsaRecoverableSignatureSave(signature, r, s, recid);
}
else
{
Util.MemSet(signature.Data, 0, EcdsaRecoverableSignature.Size); //memset(signature, 0, sizeof(* signature));
}
return(ret);
}
private static bool Secp256K1EcdsaSignRecoverable(Context ctx, EcdsaRecoverableSignature signature, byte[] msg32, byte[] seckey, NonceFunction noncefp, byte[] noncedata)
{
if (ctx == null || msg32 == null || (signature == null || seckey == null))
{
throw new NullReferenceException();
}
if (!EcMultGen.ContextIsBuilt(ctx.EcMultGenCtx))
{
throw new ArithmeticException();
}
if (noncefp == null)
{
noncefp = Secp256K1T.NonceFunctionDefault;
}
byte recid = 1;
bool flag = false;
bool overflow = false;
Scalar scalar1 = new Scalar();
Scalar.SetB32(scalar1, seckey, ref overflow);
Scalar scalar2 = new Scalar();
Scalar scalar3 = new Scalar();
if (!overflow && !Scalar.IsZero(scalar1))
{
byte[] numArray = new byte[32];
uint attempt = 0;
Scalar scalar4 = new Scalar();
Scalar.SetB32(scalar4, msg32);
Scalar scalar5 = new Scalar();
while (true)
{
flag = noncefp(numArray, msg32, seckey, (byte[])null, noncedata, attempt);
if (flag)
{
Scalar.SetB32(scalar5, numArray, ref overflow);
if (Scalar.IsZero(scalar5) || overflow || !Secp256K1Manager.Secp256K1EcdsaSigSign(ctx.EcMultGenCtx, scalar2, scalar3, scalar1, scalar4, scalar5, out recid))
{
++attempt;
}
else
{
break;
}
}
else
{
break;
}
}
Util.MemSet(numArray, (byte)0, 32);
Scalar.Clear(scalar4);
Scalar.Clear(scalar5);
Scalar.Clear(scalar1);
}
if (flag)
{
Secp256K1Manager.Secp256K1EcdsaRecoverableSignatureSave(signature, scalar2, scalar3, recid);
}
else
{
Util.MemSet(signature.Data, (byte)0, 65);
}
return(flag);
}