1 files changed, 103 insertions, 0 deletions
diff --git a/crypto/kerberosIV/lib/krb/str2key.c b/crypto/kerberosIV/lib/krb/str2key.c
new file mode 100644
index 0000000..2b00fc1
--- /dev/null
+++ b/crypto/kerberosIV/lib/krb/str2key.c
@@ -0,0 +1,103 @@
+/* This defines the Andrew string_to_key function.  It accepts a password
+ * string as input and converts its via a one-way encryption algorithm to a DES
+ * encryption key.  It is compatible with the original Andrew authentication
+ * service password database.
+ */
+
+#include "krb_locl.h"
+
+RCSID("$Id: str2key.c,v 1.10 1997/03/23 03:53:19 joda Exp $");
+
+static void
+mklower(char *s)
+{
+    for (; *s; s++)
+        if ('A' <= *s && *s <= 'Z')
+            *s = *s - 'A' + 'a';
+}
+
+/*
+ * Short passwords, i.e 8 characters or less.
+ */
+static void
+afs_cmu_StringToKey (char *str, char *cell, des_cblock *key)
+{
+    char  password[8+1];	/* crypt is limited to 8 chars anyway */
+    int   i;
+    int   passlen;
+
+    memset (key, 0, sizeof(key));
+    memset(password, 0, sizeof(password));
+
+    strncpy (password, cell, 8);
+    passlen = strlen (str);
+    if (passlen > 8) passlen = 8;
+
+    for (i=0; i<passlen; i++)
+        password[i] = str[i] ^ cell[i];	/* make sure cell is zero padded */
+
+    for (i=0; i<8; i++)
+        if (password[i] == '\0') password[i] = 'X';
+
+    /* crypt only considers the first 8 characters of password but for some
+       reason returns eleven characters of result (plus the two salt chars). */
+    strncpy((char *)key, (char *)crypt(password, "#~") + 2, sizeof(des_cblock));
+
+    /* parity is inserted into the LSB so leftshift each byte up one bit.  This
+       allows ascii characters with a zero MSB to retain as much significance
+       as possible. */
+    {   char *keybytes = (char *)key;
+        unsigned int temp;
+
+        for (i = 0; i < 8; i++) {
+            temp = (unsigned int) keybytes[i];
+            keybytes[i] = (unsigned char) (temp << 1);
+        }
+    }
+    des_fixup_key_parity (key);
+}
+
+/*
+ * Long passwords, i.e 9 characters or more.
+ */
+static void
+afs_transarc_StringToKey (char *str, char *cell, des_cblock *key)
+{
+    des_key_schedule schedule;
+    des_cblock temp_key;
+    des_cblock ivec;
+    char password[512];
+    int  passlen;
+
+    strncpy (password, str, sizeof(password));
+    if ((passlen = strlen (password)) < sizeof(password)-1)
+        strncat (password, cell, sizeof(password)-passlen);
+    if ((passlen = strlen(password)) > sizeof(password)) passlen = sizeof(password);
+
+    memcpy(&ivec, "kerberos", 8);
+    memcpy(&temp_key, "kerberos", 8);
+    des_fixup_key_parity (&temp_key);
+    des_key_sched (&temp_key, schedule);
+    des_cbc_cksum ((des_cblock *)password, &ivec, passlen, schedule, &ivec);
+
+    memcpy(&temp_key, &ivec, 8);
+    des_fixup_key_parity (&temp_key);
+    des_key_sched (&temp_key, schedule);
+    des_cbc_cksum ((des_cblock *)password, key, passlen, schedule, &ivec);
+
+    des_fixup_key_parity (key);
+}
+
+void
+afs_string_to_key(char *str, char *cell, des_cblock *key)
+{
+    char realm[REALM_SZ+1];
+    strncpy(realm, cell, REALM_SZ);
+    realm[REALM_SZ] = 0;
+    mklower(realm);
+
+    if (strlen(str) > 8)
+        afs_transarc_StringToKey (str, realm, key);
+    else
+        afs_cmu_StringToKey (str, realm, key);
+}