1 files changed, 117 insertions, 0 deletions
diff --git a/src/lib/crypto/nss/pbkdf2.c b/src/lib/crypto/nss/pbkdf2.c
new file mode 100644
index 0000000..b1b1e35
--- /dev/null
+++ b/src/lib/crypto/nss/pbkdf2.c
@@ -0,0 +1,117 @@
+/*
+ * lib/crypto/nss/pbkdf2.c
+ *
+ * Copyright 2002, 2008, 2009 by the Massachusetts Institute of Technology.
+ * All Rights Reserved.
+ *
+ * Export of this software from the United States of America may
+ *   require a specific license from the United States Government.
+ *   It is the responsibility of any person or organization contemplating
+ *   export to obtain such a license before exporting.
+ *
+ * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
+ * distribute this software and its documentation for any purpose and
+ * without fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright notice and
+ * this permission notice appear in supporting documentation, and that
+ * the name of M.I.T. not be used in advertising or publicity pertaining
+ * to distribution of the software without specific, written prior
+ * permission.  Furthermore if you modify this software you must label
+ * your software as modified software and not distribute it in such a
+ * fashion that it might be confused with the original M.I.T. software.
+ * M.I.T. makes no representations about the suitability of
+ * this software for any purpose.  It is provided "as is" without express
+ * or implied warranty.
+ *
+ *
+ * Implementation of PBKDF2 from RFC 2898.
+ * Not currently used; likely to be used when we get around to AES support.
+ */
+
+#include <ctype.h>
+#include "k5-int.h"
+#include "hash_provider.h"
+#include "pk11pub.h"
+#include "nss_gen.h"
+
+
+krb5_error_code
+krb5int_pbkdf2_hmac_sha1 (const krb5_data *out, unsigned long count,
+			  const krb5_data *pass, const krb5_data *salt)
+{
+
+    PK11SlotInfo *slot = NULL;
+    SECAlgorithmID *algid = NULL;
+    PK11SymKey *symKey = NULL;
+    SECItem saltItem, pwItem;
+    const SECItem *keydata = NULL;
+    SECOidTag  pbeAlg = SEC_OID_PKCS5_PBKDF2;
+    SECOidTag  cipherAlg = SEC_OID_AES_256_CBC; 
+    SECOidTag  prfAlg = SEC_OID_HMAC_SHA1;
+    krb5_error_code ret;
+
+    ret = k5_nss_init();
+    if (ret) return ret;
+
+    slot = PK11_GetBestSlot(PK11_AlgtagToMechanism(pbeAlg), NULL);
+    if (slot == NULL) {
+	return k5_nss_map_last_error();
+    }
+
+    saltItem.type = siBuffer;
+    saltItem.data = (unsigned char *)salt->data;
+    saltItem.len = salt->length;
+
+    /* PKCS 5 was designed to be DER encoded. Algid's carry all the
+     * information needed to describe the encoding the the recipient.
+     * This usually allows for crypto agility in the protocol automatically.
+     * Kerberos already had to solve it's crypto agility issues, so the
+     * algid is just and extra step we need that we will throw away */
+    algid = PK11_CreatePBEV2AlgorithmID(pbeAlg, cipherAlg, prfAlg,
+					out->length, count, &saltItem);
+    if (algid == NULL) {
+	ret = k5_nss_map_last_error();
+	goto loser;
+    }
+
+    pwItem.type = siBuffer;
+    pwItem.data = (unsigned char *)pass->data;
+    pwItem.len = pass->length;
+
+    symKey = PK11_PBEKeyGen(slot, algid, &pwItem, PR_FALSE, NULL);
+    if (symKey == NULL) {
+	ret = k5_nss_map_last_error();
+	goto loser;
+    }
+    /* at this point we should return symKey as a key, but kerberos is
+     * still passing bits around instead of key handles */
+    PK11_ExtractKeyValue(symKey);
+
+    /* keydata here is a const * and is valid as long as the key has not been
+     * destroyed. */
+    keydata = PK11_GetKeyData(symKey);
+    if (keydata == NULL) {
+	ret = k5_nss_map_last_error();
+	goto loser;
+    }
+
+    if (out->length != keydata->len) {
+	ret = -1; /* XXXXX */
+	goto loser;
+    }
+    memcpy(out->data, keydata->data, keydata->len);
+    ret = 0;
+
+loser:
+    if (symKey) {
+	PK11_FreeSymKey(symKey);
+    }
+    if (algid) {
+	SECOID_DestroyAlgorithmID(algid, PR_TRUE);
+    }
+    if (slot) {
+	PK11_FreeSlot(slot);
+    }
+    
+    return ret;
+}