1 files changed, 96 insertions, 0 deletions
diff --git a/src/lib/crypto/krb/dk/stringtokey.c b/src/lib/crypto/krb/dk/stringtokey.c
new file mode 100644
index 0000000..0e54b84
--- /dev/null
+++ b/src/lib/crypto/krb/dk/stringtokey.c
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 1998 by the FundsXpress, INC.
+ * 
+ * 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 FundsXpress. not be used in advertising or publicity pertaining
+ * to distribution of the software without specific, written prior
+ * permission.  FundsXpress makes no representations about the suitability of
+ * this software for any purpose.  It is provided "as is" without express
+ * or implied warranty.
+ * 
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+#include "dk.h"
+
+static const unsigned char kerberos[] = "kerberos";
+#define kerberos_len (sizeof(kerberos)-1)
+
+krb5_error_code
+krb5int_dk_string_to_key(const struct krb5_enc_provider *enc,
+			 const krb5_data *string, const krb5_data *salt,
+			 const krb5_data *parms, krb5_keyblock *key)
+{
+    krb5_error_code ret;
+    size_t keybytes, keylength, concatlen;
+    unsigned char *concat, *foldstring, *foldkeydata;
+    krb5_data indata;
+    krb5_keyblock foldkey;
+
+    /* key->length is checked by krb5_derive_key */
+
+    keybytes = enc->keybytes;
+    keylength = enc->keylength;
+
+    concatlen = string->length+(salt?salt->length:0);
+
+    if ((concat = (unsigned char *) malloc(concatlen)) == NULL)
+	return(ENOMEM);
+    if ((foldstring = (unsigned char *) malloc(keybytes)) == NULL) {
+	free(concat);
+	return(ENOMEM);
+    }
+    if ((foldkeydata = (unsigned char *) malloc(keylength)) == NULL) {
+	free(foldstring);
+	free(concat);
+	return(ENOMEM);
+    }
+
+    /* construct input string ( = string + salt), fold it, make_key it */
+
+    memcpy(concat, string->data, string->length);
+    if (salt)
+	memcpy(concat+string->length, salt->data, salt->length);
+
+    krb5_nfold(concatlen*8, concat, keybytes*8, foldstring);
+
+    indata.length = keybytes;
+    indata.data = (char *) foldstring;
+    foldkey.length = keylength;
+    foldkey.contents = foldkeydata;
+
+    (*(enc->make_key))(&indata, &foldkey);
+
+    /* now derive the key from this one */
+
+    indata.length = kerberos_len;
+    indata.data = (char *) kerberos;
+
+    if ((ret = krb5_derive_key(enc, &foldkey, key, &indata)))
+	memset(key->contents, 0, key->length);
+
+    /* ret is set correctly by the prior call */
+
+    memset(concat, 0, concatlen);
+    memset(foldstring, 0, keybytes);
+    memset(foldkeydata, 0, keylength);
+
+    free(foldkeydata);
+    free(foldstring);
+    free(concat);
+
+    return(ret);
+}