From 16a3580ef3a27d7f1fb0f76441a973b71a35b527 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timo=20Ter=C3=A4s?= <timo.teras@iki.fi>
Date: Mon, 13 Jan 2014 13:05:14 +0200
Subject: [PATCH] add legacy functions setkey() and encrypt()

---
 src/crypt/crypt_des.c | 12 ++++-----
 src/crypt/encrypt.c   | 60 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 66 insertions(+), 6 deletions(-)
 create mode 100644 src/crypt/encrypt.c

diff --git a/src/crypt/crypt_des.c b/src/crypt/crypt_des.c
index dc95dcaa..d5766a7a 100644
--- a/src/crypt/crypt_des.c
+++ b/src/crypt/crypt_des.c
@@ -692,7 +692,7 @@ static uint32_t setup_salt(uint32_t salt)
 	return saltbits;
 }
 
-static void des_setkey(const unsigned char *key, struct expanded_key *ekey)
+void __des_setkey(const unsigned char *key, struct expanded_key *ekey)
 {
 	uint32_t k0, k1, rawkey0, rawkey1;
 	unsigned int shifts, round, i, ibit;
@@ -753,7 +753,7 @@ static void des_setkey(const unsigned char *key, struct expanded_key *ekey)
 /*
  * l_in, r_in, l_out, and r_out are in pseudo-"big-endian" format.
  */
-static void do_des(uint32_t l_in, uint32_t r_in,
+void __do_des(uint32_t l_in, uint32_t r_in,
     uint32_t *l_out, uint32_t *r_out,
     uint32_t count, uint32_t saltbits, const struct expanded_key *ekey)
 {
@@ -862,7 +862,7 @@ static void des_cipher(const unsigned char *in, unsigned char *out,
 	    ((uint32_t)in[5] << 16) |
 	    ((uint32_t)in[4] << 24);
 
-	do_des(rawl, rawr, &l_out, &r_out, count, saltbits, ekey);
+	__do_des(rawl, rawr, &l_out, &r_out, count, saltbits, ekey);
 
 	out[0] = l_out >> 24;
 	out[1] = l_out >> 16;
@@ -894,7 +894,7 @@ static char *_crypt_extended_r_uut(const char *_key, const char *_setting, char
 		if (*key)
 			key++;
 	}
-	des_setkey(keybuf, &ekey);
+	__des_setkey(keybuf, &ekey);
 
 	if (*setting == _PASSWORD_EFMT1) {
 		/*
@@ -929,7 +929,7 @@ static char *_crypt_extended_r_uut(const char *_key, const char *_setting, char
 			q = keybuf;
 			while (q <= &keybuf[sizeof(keybuf) - 1] && *key)
 				*q++ ^= *key++ << 1;
-			des_setkey(keybuf, &ekey);
+			__des_setkey(keybuf, &ekey);
 		}
 
 		memcpy(output, setting, 9);
@@ -957,7 +957,7 @@ static char *_crypt_extended_r_uut(const char *_key, const char *_setting, char
 	/*
 	 * Do it.
 	 */
-	do_des(0, 0, &r0, &r1, count, setup_salt(salt), &ekey);
+	__do_des(0, 0, &r0, &r1, count, setup_salt(salt), &ekey);
 
 	/*
 	 * Now encode the result...
diff --git a/src/crypt/encrypt.c b/src/crypt/encrypt.c
new file mode 100644
index 00000000..9332a6de
--- /dev/null
+++ b/src/crypt/encrypt.c
@@ -0,0 +1,60 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+struct expanded_key {
+        uint32_t l[16], r[16];
+};
+
+void __des_setkey(const unsigned char *key, struct expanded_key *ekey);
+void __do_des(uint32_t l_in, uint32_t r_in,
+    uint32_t *l_out, uint32_t *r_out,
+    uint32_t count, uint32_t saltbits, const struct expanded_key *ekey);
+
+
+static struct expanded_key __encrypt_key;
+
+void setkey(const char *key)
+{
+	unsigned char bkey[8];
+	int i, j;
+
+	for (i = 0; i < 8; i++) {
+		bkey[i] = 0;
+		for (j = 7; j >= 0; j--, key++)
+			bkey[i] |= (uint32_t)(*key & 1) << j;
+	}
+
+	__des_setkey(bkey, &__encrypt_key);
+}
+
+void encrypt(char *block, int edflag)
+{
+	struct expanded_key decrypt_key, *key;
+	uint32_t b[2];
+	int i, j;
+	char *p;
+
+	p = block;
+	for (i = 0; i < 2; i++) {
+		b[i] = 0;
+		for (j = 31; j >= 0; j--, p++)
+			b[i] |= (uint32_t)(*p & 1) << j;
+	}
+
+	key = &__encrypt_key;
+	if (edflag) {
+		key = &decrypt_key;
+		for (i = 0; i < 16; i++) {
+			decrypt_key.l[i] = __encrypt_key.l[15-i];
+			decrypt_key.r[i] = __encrypt_key.r[15-i];
+		}
+	}
+
+	__do_des(b[0], b[1], b, b + 1, 1, 0, key);
+
+	p = block;
+	for (i = 0; i < 2; i++)
+		for (j = 31; j >= 0; j--)
+			*p++ = b[i]>>j & 1;
+}