Add CAST encryption, implementation by Steve Reid <sreid@sea-to-sky.net>.

Man pages will come soon, I hope.

2 files changed, 242 insertions, 2 deletions

diff --git a/lib/libc/crypt/Makefile.inc b/lib/libc/crypt/Makefile.inc
index 7866f46a8e9..9d96d657dbe 100644
--- a/lib/libc/crypt/Makefile.inc
+++ b/lib/libc/crypt/Makefile.inc
@@ -1,8 +1,8 @@
-#	$OpenBSD: Makefile.inc,v 1.9 1997/04/16 12:11:27 deraadt Exp $
+#	$OpenBSD: Makefile.inc,v 1.10 1998/07/21 22:23:20 provos Exp $
 
 .PATH: ${.CURDIR}/arch/${MACHINE_ARCH}/crypt ${.CURDIR}/crypt
 
-SRCS+=	crypt.c morecrypt.c md5crypt.c arc4random.c blowfish.c
+SRCS+=	cast.c crypt.c morecrypt.c md5crypt.c arc4random.c blowfish.c
 SRCS+=  bcrypt.c
 
 MAN+=	crypt.3 blowfish.3 arc4random.3
diff --git a/lib/libc/crypt/cast.c b/lib/libc/crypt/cast.c
new file mode 100644
index 00000000000..69dad6b6d23
--- /dev/null
+++ b/lib/libc/crypt/cast.c
@@ -0,0 +1,240 @@
+/*      $OpenBSD: cast.c,v 1.1 1998/07/21 22:23:19 provos Exp $       */
+/*
+ *	CAST-128 in C
+ *	Written by Steve Reid <sreid@sea-to-sky.net>
+ *	100% Public Domain - no warranty
+ *	Released 1997.10.11
+ */
+
+#include <netinet/ip_cast.h>
+#include <netinet/ip_castsb.h>
+
+/* Macros to access 8-bit bytes out of a 32-bit word */
+#define U8a(x) ( (u8) (x>>24) )
+#define U8b(x) ( (u8) ((x>>16)&255) )
+#define U8c(x) ( (u8) ((x>>8)&255) )
+#define U8d(x) ( (u8) ((x)&255) )
+
+/* Circular left shift */
+#define ROL(x, n) ( ((x)<<(n)) | ((x)>>(32-(n))) )
+
+/* CAST-128 uses three different round functions */
+#define F1(l, r, i) \
+	t = ROL(key->xkey[i] + r, key->xkey[i+16]); \
+	l ^= ((cast_sbox1[U8a(t)] ^ cast_sbox2[U8b(t)]) - \
+	 cast_sbox3[U8c(t)]) + cast_sbox4[U8d(t)];
+#define F2(l, r, i) \
+	t = ROL(key->xkey[i] ^ r, key->xkey[i+16]); \
+	l ^= ((cast_sbox1[U8a(t)] - cast_sbox2[U8b(t)]) + \
+	 cast_sbox3[U8c(t)]) ^ cast_sbox4[U8d(t)];
+#define F3(l, r, i) \
+	t = ROL(key->xkey[i] - r, key->xkey[i+16]); \
+	l ^= ((cast_sbox1[U8a(t)] + cast_sbox2[U8b(t)]) ^ \
+	 cast_sbox3[U8c(t)]) - cast_sbox4[U8d(t)];
+
+
+/***** Encryption Function *****/
+
+void cast_encrypt(cast_key* key, u8* inblock, u8* outblock)
+{
+u32 t, l, r;
+
+	/* Get inblock into l,r */
+	l = ((u32)inblock[0] << 24) | ((u32)inblock[1] << 16) |
+	 ((u32)inblock[2] << 8) | (u32)inblock[3];
+	r = ((u32)inblock[4] << 24) | ((u32)inblock[5] << 16) |
+	 ((u32)inblock[6] << 8) | (u32)inblock[7];
+	/* Do the work */
+	F1(l, r,  0);
+	F2(r, l,  1);
+	F3(l, r,  2);
+	F1(r, l,  3);
+	F2(l, r,  4);
+	F3(r, l,  5);
+	F1(l, r,  6);
+	F2(r, l,  7);
+	F3(l, r,  8);
+	F1(r, l,  9);
+	F2(l, r, 10);
+	F3(r, l, 11);
+	/* Only do full 16 rounds if key length > 80 bits */
+	if (key->rounds > 12) {
+		F1(l, r, 12);
+		F2(r, l, 13);
+		F3(l, r, 14);
+		F1(r, l, 15);
+	}
+	/* Put l,r into outblock */
+	outblock[0] = U8a(r);
+	outblock[1] = U8b(r);
+	outblock[2] = U8c(r);
+	outblock[3] = U8d(r);
+	outblock[4] = U8a(l);
+	outblock[5] = U8b(l);
+	outblock[6] = U8c(l);
+	outblock[7] = U8d(l);
+	/* Wipe clean */
+	t = l = r = 0;
+}
+
+
+/***** Decryption Function *****/
+
+void cast_decrypt(cast_key* key, u8* inblock, u8* outblock)
+{
+u32 t, l, r;
+
+	/* Get inblock into l,r */
+	r = ((u32)inblock[0] << 24) | ((u32)inblock[1] << 16) |
+	 ((u32)inblock[2] << 8) | (u32)inblock[3];
+	l = ((u32)inblock[4] << 24) | ((u32)inblock[5] << 16) |
+	 ((u32)inblock[6] << 8) | (u32)inblock[7];
+	/* Do the work */
+	/* Only do full 16 rounds if key length > 80 bits */
+	if (key->rounds > 12) {
+		F1(r, l, 15);
+		F3(l, r, 14);
+		F2(r, l, 13);
+		F1(l, r, 12);
+	}
+	F3(r, l, 11);
+	F2(l, r, 10);
+	F1(r, l,  9);
+	F3(l, r,  8);
+	F2(r, l,  7);
+	F1(l, r,  6);
+	F3(r, l,  5);
+	F2(l, r,  4);
+	F1(r, l,  3);
+	F3(l, r,  2);
+	F2(r, l,  1);
+	F1(l, r,  0);
+	/* Put l,r into outblock */
+	outblock[0] = U8a(l);
+	outblock[1] = U8b(l);
+	outblock[2] = U8c(l);
+	outblock[3] = U8d(l);
+	outblock[4] = U8a(r);
+	outblock[5] = U8b(r);
+	outblock[6] = U8c(r);
+	outblock[7] = U8d(r);
+	/* Wipe clean */
+	t = l = r = 0;
+}
+
+
+/***** Key Schedual *****/
+
+void cast_setkey(cast_key* key, u8* rawkey, int keybytes)
+{
+u32 t[4], z[4], x[4];
+int i;
+
+	/* Set number of rounds to 12 or 16, depending on key length */
+	key->rounds = (keybytes <= 10 ? 12 : 16);
+
+	/* Copy key to workspace x */
+	for (i = 0; i < 4; i++) {
+		x[i] = 0;
+		if ((i*4+0) < keybytes) x[i] = (u32)rawkey[i*4+0] << 24;
+		if ((i*4+1) < keybytes) x[i] |= (u32)rawkey[i*4+1] << 16;
+		if ((i*4+2) < keybytes) x[i] |= (u32)rawkey[i*4+2] << 8;
+		if ((i*4+3) < keybytes) x[i] |= (u32)rawkey[i*4+3];
+	}
+	/* Generate 32 subkeys, four at a time */
+	for (i = 0; i < 32; i+=4) {
+		switch (i & 4) {
+		 case 0:
+			t[0] = z[0] = x[0] ^ cast_sbox5[U8b(x[3])] ^
+			 cast_sbox6[U8d(x[3])] ^ cast_sbox7[U8a(x[3])] ^
+			 cast_sbox8[U8c(x[3])] ^ cast_sbox7[U8a(x[2])];
+			t[1] = z[1] = x[2] ^ cast_sbox5[U8a(z[0])] ^
+			 cast_sbox6[U8c(z[0])] ^ cast_sbox7[U8b(z[0])] ^
+			 cast_sbox8[U8d(z[0])] ^ cast_sbox8[U8c(x[2])];
+			t[2] = z[2] = x[3] ^ cast_sbox5[U8d(z[1])] ^
+			 cast_sbox6[U8c(z[1])] ^ cast_sbox7[U8b(z[1])] ^
+			 cast_sbox8[U8a(z[1])] ^ cast_sbox5[U8b(x[2])];
+			t[3] = z[3] = x[1] ^ cast_sbox5[U8c(z[2])] ^
+			 cast_sbox6[U8b(z[2])] ^ cast_sbox7[U8d(z[2])] ^
+			 cast_sbox8[U8a(z[2])] ^ cast_sbox6[U8d(x[2])];
+			break;
+		 case 4:
+			t[0] = x[0] = z[2] ^ cast_sbox5[U8b(z[1])] ^
+			 cast_sbox6[U8d(z[1])] ^ cast_sbox7[U8a(z[1])] ^
+			 cast_sbox8[U8c(z[1])] ^ cast_sbox7[U8a(z[0])];
+			t[1] = x[1] = z[0] ^ cast_sbox5[U8a(x[0])] ^
+			 cast_sbox6[U8c(x[0])] ^ cast_sbox7[U8b(x[0])] ^
+			 cast_sbox8[U8d(x[0])] ^ cast_sbox8[U8c(z[0])];
+			t[2] = x[2] = z[1] ^ cast_sbox5[U8d(x[1])] ^
+			 cast_sbox6[U8c(x[1])] ^ cast_sbox7[U8b(x[1])] ^
+			 cast_sbox8[U8a(x[1])] ^ cast_sbox5[U8b(z[0])];
+			t[3] = x[3] = z[3] ^ cast_sbox5[U8c(x[2])] ^
+			 cast_sbox6[U8b(x[2])] ^ cast_sbox7[U8d(x[2])] ^
+			 cast_sbox8[U8a(x[2])] ^ cast_sbox6[U8d(z[0])];
+			break;
+		}
+		switch (i & 12) {
+		 case 0:
+		 case 12:
+			key->xkey[i+0] = cast_sbox5[U8a(t[2])] ^ cast_sbox6[U8b(t[2])] ^
+			 cast_sbox7[U8d(t[1])] ^ cast_sbox8[U8c(t[1])];
+			key->xkey[i+1] = cast_sbox5[U8c(t[2])] ^ cast_sbox6[U8d(t[2])] ^
+			 cast_sbox7[U8b(t[1])] ^ cast_sbox8[U8a(t[1])];
+			key->xkey[i+2] = cast_sbox5[U8a(t[3])] ^ cast_sbox6[U8b(t[3])] ^
+			 cast_sbox7[U8d(t[0])] ^ cast_sbox8[U8c(t[0])];
+			key->xkey[i+3] = cast_sbox5[U8c(t[3])] ^ cast_sbox6[U8d(t[3])] ^
+			 cast_sbox7[U8b(t[0])] ^ cast_sbox8[U8a(t[0])];
+			break;
+		 case 4:
+		 case 8:
+			key->xkey[i+0] = cast_sbox5[U8d(t[0])] ^ cast_sbox6[U8c(t[0])] ^
+			 cast_sbox7[U8a(t[3])] ^ cast_sbox8[U8b(t[3])];
+			key->xkey[i+1] = cast_sbox5[U8b(t[0])] ^ cast_sbox6[U8a(t[0])] ^
+			 cast_sbox7[U8c(t[3])] ^ cast_sbox8[U8d(t[3])];
+			key->xkey[i+2] = cast_sbox5[U8d(t[1])] ^ cast_sbox6[U8c(t[1])] ^
+			 cast_sbox7[U8a(t[2])] ^ cast_sbox8[U8b(t[2])];
+			key->xkey[i+3] = cast_sbox5[U8b(t[1])] ^ cast_sbox6[U8a(t[1])] ^
+			 cast_sbox7[U8c(t[2])] ^ cast_sbox8[U8d(t[2])];
+			break;
+		}
+		switch (i & 12) {
+		 case 0:
+			key->xkey[i+0] ^= cast_sbox5[U8c(z[0])];
+			key->xkey[i+1] ^= cast_sbox6[U8c(z[1])];
+			key->xkey[i+2] ^= cast_sbox7[U8b(z[2])];
+			key->xkey[i+3] ^= cast_sbox8[U8a(z[3])];
+			break;
+		 case 4:
+			key->xkey[i+0] ^= cast_sbox5[U8a(x[2])];
+			key->xkey[i+1] ^= cast_sbox6[U8b(x[3])];
+			key->xkey[i+2] ^= cast_sbox7[U8d(x[0])];
+			key->xkey[i+3] ^= cast_sbox8[U8d(x[1])];
+			break;
+		 case 8:
+			key->xkey[i+0] ^= cast_sbox5[U8b(z[2])];
+			key->xkey[i+1] ^= cast_sbox6[U8a(z[3])];
+			key->xkey[i+2] ^= cast_sbox7[U8c(z[0])];
+			key->xkey[i+3] ^= cast_sbox8[U8c(z[1])];
+			break;
+		 case 12:
+			key->xkey[i+0] ^= cast_sbox5[U8d(x[0])];
+			key->xkey[i+1] ^= cast_sbox6[U8d(x[1])];
+			key->xkey[i+2] ^= cast_sbox7[U8a(x[2])];
+			key->xkey[i+3] ^= cast_sbox8[U8b(x[3])];
+			break;
+		}
+		if (i >= 16) {
+			key->xkey[i+0] &= 31;
+			key->xkey[i+1] &= 31;
+			key->xkey[i+2] &= 31;
+			key->xkey[i+3] &= 31;
+		}
+	}
+	/* Wipe clean */
+	for (i = 0; i < 4; i++) {
+		t[i] = x[i] = z[i] = 0;
+	}
+}
+
+/* Made in Canada */
+