1 files changed, 114 insertions, 0 deletions
diff --git a/Crypto/src/bcpg/RsaSecretBcpgKey.cs b/Crypto/src/bcpg/RsaSecretBcpgKey.cs
new file mode 100644
index 000000000..5c04d9f85
--- /dev/null
+++ b/Crypto/src/bcpg/RsaSecretBcpgKey.cs
@@ -0,0 +1,114 @@
+using System;
+
+using Org.BouncyCastle.Math;
+
+namespace Org.BouncyCastle.Bcpg
+{
+ /// <remarks>Base class for an RSA secret (or priate) key.</remarks>
+ public class RsaSecretBcpgKey
+ : BcpgObject, IBcpgKey
+ {
+ private readonly MPInteger d, p, q, u;
+ private readonly BigInteger expP, expQ, crt;
+
+ public RsaSecretBcpgKey(
+ BcpgInputStream bcpgIn)
+ {
+ this.d = new MPInteger(bcpgIn);
+ this.p = new MPInteger(bcpgIn);
+ this.q = new MPInteger(bcpgIn);
+ this.u = new MPInteger(bcpgIn);
+
+ this.expP = d.Value.Remainder(p.Value.Subtract(BigInteger.One));
+ this.expQ = d.Value.Remainder(q.Value.Subtract(BigInteger.One));
+ this.crt = q.Value.ModInverse(p.Value);
+ }
+
+ public RsaSecretBcpgKey(
+ BigInteger d,
+ BigInteger p,
+ BigInteger q)
+ {
+ // PGP requires (p < q)
+ int cmp = p.CompareTo(q);
+ if (cmp >= 0)
+ {
+ if (cmp == 0)
+ throw new ArgumentException("p and q cannot be equal");
+
+ BigInteger tmp = p;
+ p = q;
+ q = tmp;
+ }
+
+ this.d = new MPInteger(d);
+ this.p = new MPInteger(p);
+ this.q = new MPInteger(q);
+ this.u = new MPInteger(p.ModInverse(q));
+
+ this.expP = d.Remainder(p.Subtract(BigInteger.One));
+ this.expQ = d.Remainder(q.Subtract(BigInteger.One));
+ this.crt = q.ModInverse(p);
+ }
+
+ public BigInteger Modulus
+ {
+ get { return p.Value.Multiply(q.Value); }
+ }
+
+ public BigInteger PrivateExponent
+ {
+ get { return d.Value; }
+ }
+
+ public BigInteger PrimeP
+ {
+ get { return p.Value; }
+ }
+
+ public BigInteger PrimeQ
+ {
+ get { return q.Value; }
+ }
+
+ public BigInteger PrimeExponentP
+ {
+ get { return expP; }
+ }
+
+ public BigInteger PrimeExponentQ
+ {
+ get { return expQ; }
+ }
+
+ public BigInteger CrtCoefficient
+ {
+ get { return crt; }
+ }
+
+ /// <summary>The format, as a string, always "PGP".</summary>
+ public string Format
+ {
+ get { return "PGP"; }
+ }
+
+ /// <summary>Return the standard PGP encoding of the key.</summary>
+ public override byte[] GetEncoded()
+ {
+ try
+ {
+ return base.GetEncoded();
+ }
+ catch (Exception)
+ {
+ return null;
+ }
+ }
+
+ public override void Encode(
+ BcpgOutputStream bcpgOut)
+ {
+ bcpgOut.WriteObjects(d, p, q, u);
+ }
+ }
+}
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