1 files changed, 150 insertions, 0 deletions
diff --git a/crypto/src/asn1/cmp/KemOtherInfo.cs b/crypto/src/asn1/cmp/KemOtherInfo.cs
new file mode 100644
index 000000000..3185495fc
--- /dev/null
+++ b/crypto/src/asn1/cmp/KemOtherInfo.cs
@@ -0,0 +1,150 @@
+using System;
+
+using Org.BouncyCastle.Asn1.X509;
+
+namespace Org.BouncyCastle.Asn1.Cmp
+{
+    /*
+     * <pre>
+     * KemOtherInfo ::= SEQUENCE {
+     *   staticString      PKIFreeText,  -- MUST be "CMP-KEM"
+     *   transactionID [0] OCTET STRING     OPTIONAL,
+     *   senderNonce   [1] OCTET STRING     OPTIONAL,
+     *   recipNonce    [2] OCTET STRING     OPTIONAL,
+     *   len               INTEGER (1..MAX),
+     *   mac               AlgorithmIdentifier{MAC-ALGORITHM, {...}}
+     *   ct                OCTET STRING
+     * }
+     * </pre>
+     */
+    public class KemOtherInfo
+        : Asn1Encodable
+    {
+        public static KemOtherInfo GetInstance(object obj)
+        {
+            if (obj == null)
+                return null;
+            if (obj is KemOtherInfo kemOtherInfo)
+                return kemOtherInfo;
+            return new KemOtherInfo(Asn1Sequence.GetInstance(obj));
+        }
+
+        public static KemOtherInfo GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit) =>
+            new KemOtherInfo(Asn1Sequence.GetInstance(taggedObject, declaredExplicit));
+
+        private static readonly PkiFreeText DEFAULT_staticString = new PkiFreeText("CMP-KEM");
+
+        private readonly PkiFreeText m_staticString;
+        private readonly Asn1OctetString m_transactionID;
+        private readonly Asn1OctetString m_senderNonce;
+        private readonly Asn1OctetString m_recipNonce;
+        private readonly DerInteger m_len;
+        private readonly AlgorithmIdentifier m_mac;
+        private readonly Asn1OctetString m_ct;
+
+        public KemOtherInfo(Asn1OctetString transactionID, Asn1OctetString senderNonce, Asn1OctetString recipNonce,
+            DerInteger len, AlgorithmIdentifier mac, Asn1OctetString ct)
+        {
+            m_staticString = DEFAULT_staticString;
+            m_transactionID = transactionID;
+            m_senderNonce = senderNonce;
+            m_recipNonce = recipNonce;
+            m_len = len;
+            m_mac = mac;
+            m_ct = ct;
+        }
+
+        public KemOtherInfo(Asn1OctetString transactionID, Asn1OctetString senderNonce, Asn1OctetString recipNonce,
+            long len, AlgorithmIdentifier mac, Asn1OctetString ct)
+            : this(transactionID, senderNonce, recipNonce, new DerInteger(len), mac, ct)
+        {
+        }
+
+        private KemOtherInfo(Asn1Sequence seq)
+        {
+            if (seq.Count < 4 || seq.Count > 7)
+                throw new ArgumentException("sequence size should be between 4 and 7 inclusive", nameof(seq));
+
+            int seqPos = 0;
+
+            m_staticString = PkiFreeText.GetInstance(seq[seqPos]);
+            if (!DEFAULT_staticString.Equals(m_staticString))
+                throw new ArgumentException("staticString field should be " + DEFAULT_staticString);
+
+            Asn1TaggedObject tagged = seq[++seqPos] as Asn1TaggedObject;
+
+            if (tagged != null &&
+                Asn1Utilities.TryGetContextBaseUniversal(tagged, 0, true, Asn1Tags.OctetString, out var transactionID))
+            {
+                m_transactionID = (Asn1OctetString)transactionID;
+                tagged = seq[++seqPos] as Asn1TaggedObject;
+            }
+
+            if (tagged != null &&
+                Asn1Utilities.TryGetContextBaseUniversal(tagged, 1, true, Asn1Tags.OctetString, out var senderNonce))
+            {
+                m_senderNonce = (Asn1OctetString)senderNonce;
+                tagged = seq[++seqPos] as Asn1TaggedObject;
+            }
+
+            if (tagged != null &&
+                Asn1Utilities.TryGetContextBaseUniversal(tagged, 2, true, Asn1Tags.OctetString, out var recipNonce))
+            {
+                m_recipNonce = (Asn1OctetString)recipNonce;
+                tagged = seq[++seqPos] as Asn1TaggedObject;
+            }
+
+            if (tagged != null)
+                throw new ArgumentException("unknown tag: " + Asn1Utilities.GetTagText(tagged));
+
+            m_len = DerInteger.GetInstance(seq[seqPos]);
+            m_mac = AlgorithmIdentifier.GetInstance(seq[++seqPos]);
+            m_ct = Asn1OctetString.GetInstance(seq[++seqPos]);
+
+            if (++seqPos != seq.Count)
+                throw new ArgumentException("unexpected data at end of sequence", nameof(seq));
+        }
+
+        public virtual Asn1OctetString TransactionID => m_transactionID;
+
+        public virtual Asn1OctetString SenderNonce => m_senderNonce;
+
+        public virtual Asn1OctetString RecipNonce => m_recipNonce;
+
+        public virtual DerInteger Len => m_len;
+
+        public virtual AlgorithmIdentifier Mac => m_mac;
+
+        public virtual Asn1OctetString Ct => m_ct;
+
+        /**
+         * <pre>
+         * KemOtherInfo ::= SEQUENCE {
+         *   staticString      PKIFreeText,   -- MUST be "CMP-KEM"
+         *   transactionID [0] OCTET STRING     OPTIONAL,
+         *   senderNonce   [1] OCTET STRING     OPTIONAL,
+         *   recipNonce    [2] OCTET STRING     OPTIONAL,
+         *   len               INTEGER (1..MAX),
+         *   mac               AlgorithmIdentifier{MAC-ALGORITHM, {...}}
+         *   ct                OCTET STRING
+         * }
+         * </pre>
+         *
+         * @return a basic ASN.1 object representation.
+         */
+        public override Asn1Object ToAsn1Object()
+        {
+            Asn1EncodableVector v = new Asn1EncodableVector(7);
+
+            v.Add(m_staticString);
+            v.AddOptionalTagged(true, 0, m_transactionID);
+            v.AddOptionalTagged(true, 1, m_senderNonce);
+            v.AddOptionalTagged(true, 2, m_recipNonce);
+            v.Add(m_len);
+            v.Add(m_mac);
+            v.Add(m_ct);
+
+            return new DerSequence(v);
+        }
+    }
+}