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+/*
+ * This function implements the "bigcrypt" algorithm specifically for
+ * Linux-PAM.
+ *
+ * This algorithm is algorithm 0 (default) shipped with the C2 secure
+ * implementation of Digital UNIX.
+ *
+ * Disclaimer: This work is not based on the source code to Digital
+ * UNIX, nor am I connected to Digital Equipment Corp, in any way
+ * other than as a customer. This code is based on published
+ * interfaces and reasonable guesswork.
+ *
+ * Description: The cleartext is divided into blocks of SEGMENT_SIZE=8
+ * characters or less. Each block is encrypted using the standard UNIX
+ * libc crypt function. The result of the encryption for one block
+ * provides the salt for the suceeding block.
+ *
+ * Restrictions: The buffer used to hold the encrypted result is
+ * statically allocated. (see MAX_PASS_LEN below). This is necessary,
+ * as the returned pointer points to "static data that are overwritten
+ * by each call", (XPG3: XSI System Interface + Headers pg 109), and
+ * this is a drop in replacement for crypt();
+ *
+ * Andy Phillips <atp@mssl.ucl.ac.uk>
+ */
+
+#include <string.h>
+#include <security/_pam_macros.h>
+
+char *crypt(const char *key, const char *salt);
+char *bigcrypt(const char *key, const char *salt);
+
+/*
+ * Max cleartext password length in segments of 8 characters this
+ * function can deal with (16 segments of 8 chars= max 128 character
+ * password).
+ */
+
+#define MAX_PASS_LEN 16
+#define SEGMENT_SIZE 8
+#define SALT_SIZE 2
+#define KEYBUF_SIZE ((MAX_PASS_LEN*SEGMENT_SIZE)+SALT_SIZE)
+#define ESEGMENT_SIZE 11
+#define CBUF_SIZE ((MAX_PASS_LEN*ESEGMENT_SIZE)+SALT_SIZE+1)
+
+char *bigcrypt(const char *key, const char *salt)
+{
+ static char dec_c2_cryptbuf[CBUF_SIZE]; /* static storage area */
+
+ unsigned long int keylen, n_seg, j;
+ char *cipher_ptr, *plaintext_ptr, *tmp_ptr, *salt_ptr;
+ char keybuf[KEYBUF_SIZE + 1];
+
+ D(("called with key='%s', salt='%s'.", key, salt));
+
+ /* reset arrays */
+ memset(keybuf, 0, KEYBUF_SIZE + 1);
+ memset(dec_c2_cryptbuf, 0, CBUF_SIZE);
+
+ /* fill KEYBUF_SIZE with key */
+ strncpy(keybuf, key, KEYBUF_SIZE);
+
+ /* deal with case that we are doing a password check for a
+ conventially encrypted password: the salt will be
+ SALT_SIZE+ESEGMENT_SIZE long. */
+ if (strlen(salt) == (SALT_SIZE + ESEGMENT_SIZE))
+ keybuf[SEGMENT_SIZE] = '\0'; /* terminate password early(?) */
+
+ keylen = strlen(keybuf);
+
+ if (!keylen) {
+ n_seg = 1;
+ } else {
+ /* work out how many segments */
+ n_seg = 1 + ((keylen - 1) / SEGMENT_SIZE);
+ }
+
+ if (n_seg > MAX_PASS_LEN)
+ n_seg = MAX_PASS_LEN; /* truncate at max length */
+
+ /* set up some pointers */
+ cipher_ptr = dec_c2_cryptbuf;
+ plaintext_ptr = keybuf;
+
+ /* do the first block with supplied salt */
+ tmp_ptr = crypt(plaintext_ptr, salt); /* libc crypt() */
+
+ /* and place in the static area */
+ strncpy(cipher_ptr, tmp_ptr, 13);
+ cipher_ptr += ESEGMENT_SIZE + SALT_SIZE;
+ plaintext_ptr += SEGMENT_SIZE; /* first block of SEGMENT_SIZE */
+
+ /* change the salt (1st 2 chars of previous block) - this was found
+ by dowsing */
+
+ salt_ptr = cipher_ptr - ESEGMENT_SIZE;
+
+ /* so far this is identical to "return crypt(key, salt);", if
+ there is more than one block encrypt them... */
+
+ if (n_seg > 1) {
+ for (j = 2; j <= n_seg; j++) {
+
+ tmp_ptr = crypt(plaintext_ptr, salt_ptr);
+
+ /* skip the salt for seg!=0 */
+ strncpy(cipher_ptr, (tmp_ptr + SALT_SIZE), ESEGMENT_SIZE);
+
+ cipher_ptr += ESEGMENT_SIZE;
+ plaintext_ptr += SEGMENT_SIZE;
+ salt_ptr = cipher_ptr - ESEGMENT_SIZE;
+ }
+ }
+ D(("key=|%s|, salt=|%s|\nbuf=|%s|\n", key, salt, dec_c2_cryptbuf));
+
+ /* this is the <NUL> terminated encrypted password */
+
+ return dec_c2_cryptbuf;
+}