added support for composite private keys nested in OCTET STRING

minor refactor - removed use of toUpperCase() in BCMLDSAPrivateKey

Author: dghgit

prov/src/main/java/org/bouncycastle/jcajce/provider/asymmetric/compositesignatures/KeyFactorySpi.java

@@ -18,6 +18,7 @@
 import java.util.Map;
 
 import org.bouncycastle.asn1.ASN1BitString;
+import org.bouncycastle.asn1.ASN1Encodable;
 import org.bouncycastle.asn1.ASN1EncodableVector;
 import org.bouncycastle.asn1.ASN1ObjectIdentifier;
 import org.bouncycastle.asn1.ASN1OctetString;
@@ -192,7 +193,15 @@ public PrivateKey generatePrivate(PrivateKeyInfo keyInfo)
             // TODO: backwards compatibility code - should be deleted after 1.84.
             try
             {
-                seq = DERSequence.getInstance(keyInfo.parsePrivateKey());
+                ASN1Encodable obj = keyInfo.parsePrivateKey();
+                if (obj instanceof ASN1OctetString)
+                {
+                    seq = DERSequence.getInstance(ASN1OctetString.getInstance(obj).getOctets());
+                }
+                else
+                {
+                    seq = DERSequence.getInstance(obj);
+                }
             }
             catch (Exception e)
             {

prov/src/main/java/org/bouncycastle/jcajce/provider/asymmetric/mldsa/BCMLDSAPrivateKey.java

@@ -51,7 +51,7 @@ private void init(MLDSAPrivateKeyParameters params, ASN1Set attributes)
     {
         this.attributes = attributes;
         this.params = params;
-        algorithm = MLDSAParameterSpec.fromName(params.getParameters().getName()).getName().toUpperCase();
+        algorithm = Strings.toUpperCase(MLDSAParameterSpec.fromName(params.getParameters().getName()).getName());
     }
 
     /**