diff --git a/Crypto/src/asn1/pkcs/RSAPrivateKeyStructure.cs b/Crypto/src/asn1/pkcs/RSAPrivateKeyStructure.cs
new file mode 100644
index 000000000..dbb07c744
--- /dev/null
+++ b/Crypto/src/asn1/pkcs/RSAPrivateKeyStructure.cs
@@ -0,0 +1,131 @@
+using System;
+using System.Collections;
+
+using Org.BouncyCastle.Asn1;
+using Org.BouncyCastle.Math;
+
+namespace Org.BouncyCastle.Asn1.Pkcs
+{
+ public class RsaPrivateKeyStructure
+ : Asn1Encodable
+ {
+ private readonly BigInteger modulus;
+ private readonly BigInteger publicExponent;
+ private readonly BigInteger privateExponent;
+ private readonly BigInteger prime1;
+ private readonly BigInteger prime2;
+ private readonly BigInteger exponent1;
+ private readonly BigInteger exponent2;
+ private readonly BigInteger coefficient;
+
+ public RsaPrivateKeyStructure(
+ BigInteger modulus,
+ BigInteger publicExponent,
+ BigInteger privateExponent,
+ BigInteger prime1,
+ BigInteger prime2,
+ BigInteger exponent1,
+ BigInteger exponent2,
+ BigInteger coefficient)
+ {
+ this.modulus = modulus;
+ this.publicExponent = publicExponent;
+ this.privateExponent = privateExponent;
+ this.prime1 = prime1;
+ this.prime2 = prime2;
+ this.exponent1 = exponent1;
+ this.exponent2 = exponent2;
+ this.coefficient = coefficient;
+ }
+
+ public RsaPrivateKeyStructure(
+ Asn1Sequence seq)
+ {
+ BigInteger version = ((DerInteger) seq[0]).Value;
+ if (version.IntValue != 0)
+ throw new ArgumentException("wrong version for RSA private key");
+
+ modulus = ((DerInteger) seq[1]).Value;
+ publicExponent = ((DerInteger) seq[2]).Value;
+ privateExponent = ((DerInteger) seq[3]).Value;
+ prime1 = ((DerInteger) seq[4]).Value;
+ prime2 = ((DerInteger) seq[5]).Value;
+ exponent1 = ((DerInteger) seq[6]).Value;
+ exponent2 = ((DerInteger) seq[7]).Value;
+ coefficient = ((DerInteger) seq[8]).Value;
+ }
+
+ public BigInteger Modulus
+ {
+ get { return modulus; }
+ }
+
+ public BigInteger PublicExponent
+ {
+ get { return publicExponent; }
+ }
+
+ public BigInteger PrivateExponent
+ {
+ get { return privateExponent; }
+ }
+
+ public BigInteger Prime1
+ {
+ get { return prime1; }
+ }
+
+ public BigInteger Prime2
+ {
+ get { return prime2; }
+ }
+
+ public BigInteger Exponent1
+ {
+ get { return exponent1; }
+ }
+
+ public BigInteger Exponent2
+ {
+ get { return exponent2; }
+ }
+
+ public BigInteger Coefficient
+ {
+ get { return coefficient; }
+ }
+
+ /**
+ * This outputs the key in Pkcs1v2 format.
+ * <pre>
+ * RsaPrivateKey ::= Sequence {
+ * version Version,
+ * modulus Integer, -- n
+ * publicExponent Integer, -- e
+ * privateExponent Integer, -- d
+ * prime1 Integer, -- p
+ * prime2 Integer, -- q
+ * exponent1 Integer, -- d mod (p-1)
+ * exponent2 Integer, -- d mod (q-1)
+ * coefficient Integer -- (inverse of q) mod p
+ * }
+ *
+ * Version ::= Integer
+ * </pre>
+ * <p>This routine is written to output Pkcs1 version 0, private keys.</p>
+ */
+ public override Asn1Object ToAsn1Object()
+ {
+ return new DerSequence(
+ new DerInteger(0), // version
+ new DerInteger(Modulus),
+ new DerInteger(PublicExponent),
+ new DerInteger(PrivateExponent),
+ new DerInteger(Prime1),
+ new DerInteger(Prime2),
+ new DerInteger(Exponent1),
+ new DerInteger(Exponent2),
+ new DerInteger(Coefficient));
+ }
+ }
+}
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