--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nss/lib/certdb/xauthkid.c	Mon Jul 28 10:47:06 2014 +0200
@@ -0,0 +1,128 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * X.509 v3 Subject Key Usage Extension 
+ *
+ */
+
+#include "prtypes.h"
+#include "seccomon.h"
+#include "secdert.h"
+#include "secoidt.h"
+#include "secasn1t.h"
+#include "secasn1.h"
+#include "secport.h"
+#include "certt.h"  
+#include "genname.h"
+#include "secerr.h"
+
+SEC_ASN1_MKSUB(SEC_IntegerTemplate)
+SEC_ASN1_MKSUB(SEC_OctetStringTemplate)
+
+const SEC_ASN1Template CERTAuthKeyIDTemplate[] = {
+    { SEC_ASN1_SEQUENCE, 0, NULL, sizeof(CERTAuthKeyID) },
+    { SEC_ASN1_OPTIONAL | SEC_ASN1_CONTEXT_SPECIFIC | SEC_ASN1_XTRN | 0,
+	  offsetof(CERTAuthKeyID,keyID), SEC_ASN1_SUB(SEC_OctetStringTemplate)},
+    { SEC_ASN1_OPTIONAL | SEC_ASN1_CONSTRUCTED | SEC_ASN1_CONTEXT_SPECIFIC  | 1,
+          offsetof(CERTAuthKeyID, DERAuthCertIssuer), CERT_GeneralNamesTemplate},
+    { SEC_ASN1_OPTIONAL | SEC_ASN1_CONTEXT_SPECIFIC | SEC_ASN1_XTRN | 2,
+	  offsetof(CERTAuthKeyID,authCertSerialNumber),
+          SEC_ASN1_SUB(SEC_IntegerTemplate) },
+    { 0 }
+};
+
+
+
+SECStatus CERT_EncodeAuthKeyID (PLArenaPool *arena, CERTAuthKeyID *value, SECItem *encodedValue)
+{
+    SECStatus rv = SECFailure;
+ 
+    PORT_Assert (value);
+    PORT_Assert (arena);
+    PORT_Assert (value->DERAuthCertIssuer == NULL);
+    PORT_Assert (encodedValue);
+
+    do {
+	
+	/* If both of the authCertIssuer and the serial number exist, encode
+	   the name first.  Otherwise, it is an error if one exist and the other
+	   is not.
+	 */
+	if (value->authCertIssuer) {
+	    if (!value->authCertSerialNumber.data) {
+		PORT_SetError (SEC_ERROR_EXTENSION_VALUE_INVALID);
+		break;
+	    }
+
+	    value->DERAuthCertIssuer = cert_EncodeGeneralNames
+		(arena, value->authCertIssuer);
+	    if (!value->DERAuthCertIssuer) {
+		PORT_SetError (SEC_ERROR_EXTENSION_VALUE_INVALID);
+		break;
+	    }
+	}
+	else if (value->authCertSerialNumber.data) {
+		PORT_SetError (SEC_ERROR_EXTENSION_VALUE_INVALID);
+		break;
+	}
+
+	if (SEC_ASN1EncodeItem (arena, encodedValue, value,
+				CERTAuthKeyIDTemplate) == NULL)
+	    break;
+	rv = SECSuccess;
+
+    } while (0);
+     return(rv);
+}
+
+CERTAuthKeyID *
+CERT_DecodeAuthKeyID (PLArenaPool *arena, const SECItem *encodedValue)
+{
+    CERTAuthKeyID * value = NULL;
+    SECStatus       rv    = SECFailure;
+    void *          mark;
+    SECItem         newEncodedValue;
+
+    PORT_Assert (arena);
+   
+    do {
+	mark = PORT_ArenaMark (arena);
+	value = (CERTAuthKeyID*)PORT_ArenaZAlloc (arena, sizeof (*value));
+	if (value == NULL)
+	    break;
+	value->DERAuthCertIssuer = NULL;
+        /* copy the DER into the arena, since Quick DER returns data that points
+           into the DER input, which may get freed by the caller */
+        rv = SECITEM_CopyItem(arena, &newEncodedValue, encodedValue);
+        if ( rv != SECSuccess ) {
+	    break;
+        }
+
+        rv = SEC_QuickDERDecodeItem
+	     (arena, value, CERTAuthKeyIDTemplate, &newEncodedValue);
+	if (rv != SECSuccess)
+	    break;
+
+        value->authCertIssuer = cert_DecodeGeneralNames (arena, value->DERAuthCertIssuer);
+	if (value->authCertIssuer == NULL)
+	    break;
+	
+	/* what if the general name contains other format but not URI ?
+	   hl
+	 */
+	if ((value->authCertSerialNumber.data && !value->authCertIssuer) ||
+	    (!value->authCertSerialNumber.data && value->authCertIssuer)){
+	    PORT_SetError (SEC_ERROR_EXTENSION_VALUE_INVALID);
+	    break;
+	}
+    } while (0);
+
+    if (rv != SECSuccess) {
+	PORT_ArenaRelease (arena, mark);
+	return ((CERTAuthKeyID *)NULL);	    
+    } 
+    PORT_ArenaUnmark(arena, mark);
+    return (value);
+}