import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

security/nss/lib/util/secplcy.c

@@ -0,0 +1,83 @@
+/* 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/. */
+
+#include "secplcy.h"
+#include "prmem.h"
+
+SECCipherFind *
+sec_CipherFindInit(PRBool onlyAllowed,
+                   secCPStruct *policy,
+                   long *ciphers)
+{
+    SECCipherFind *find = PR_NEWZAP(SECCipherFind);
+    if (find) {
+        find->policy = policy;
+        find->ciphers = ciphers;
+        find->onlyAllowed = onlyAllowed;
+        find->index = -1;
+    }
+    return find;
+}
+
+long
+sec_CipherFindNext(SECCipherFind *find)
+{
+    char *policy;
+    long rv = -1;
+    secCPStruct *policies = (secCPStruct *)find->policy;
+    long *ciphers = (long *)find->ciphers;
+    long numCiphers = policies->num_ciphers;
+
+    find->index++;
+    while ((find->index < numCiphers) && (rv == -1)) {
+        /* Translate index to cipher. */
+        rv = ciphers[find->index];
+
+        /* If we're only looking for allowed ciphers, and if this
+           cipher isn't allowed, loop around.*/
+        if (find->onlyAllowed) {
+            /* Find the appropriate policy flag. */
+            policy = (&(policies->begin_ciphers)) + find->index + 1;
+
+            /* If this cipher isn't allowed by policy, continue. */
+            if (!(*policy)) {
+                rv = -1;
+                find->index++;
+            }
+        }
+    }
+
+    return rv;
+}
+
+char
+sec_IsCipherAllowed(long cipher, secCPStruct *policies,
+                    long *ciphers)
+{
+    char result = SEC_CIPHER_NOT_ALLOWED; /* our default answer */
+    long numCiphers = policies->num_ciphers;
+    char *policy;
+    int i;
+
+    /* Convert the cipher number into a policy flag location. */
+    for (i = 0, policy = (&(policies->begin_ciphers) + 1);
+         i < numCiphers;
+         i++, policy++) {
+        if (cipher == ciphers[i])
+            break;
+    }
+
+    if (i < numCiphers) {
+        /* Found the cipher, get the policy value. */
+        result = *policy;
+    }
+
+    return result;
+}
+
+void
+sec_CipherFindEnd(SECCipherFind *find)
+{
+    PR_FREEIF(find);
+}