--- /dev/null
+/* -*-c-*-
+ *
+ * $Id: rc2.c,v 1.1 2000/06/17 11:54:34 mdw Exp $
+ *
+ * The RC2 block cipher
+ *
+ * (c) 2000 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------*
+ *
+ * This file is part of Catacomb.
+ *
+ * Catacomb is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * Catacomb is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with Catacomb; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+/*----- Revision history --------------------------------------------------*
+ *
+ * $Log: rc2.c,v $
+ * Revision 1.1 2000/06/17 11:54:34 mdw
+ * New cipher.
+ *
+ */
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <assert.h>
+#include <stdio.h>
+
+#include <mLib/bits.h>
+
+#include "blkc.h"
+#include "gcipher.h"
+#include "paranoia.h"
+#include "rc2.h"
+
+/*----- Global variables --------------------------------------------------*/
+
+const octet rc2_keysz[] = { KSZ_RANGE, RC2_KEYSZ, 1, 128, 1 };
+
+/*----- Important tables --------------------------------------------------*/
+
+static const octet pi[] = {
+ 0xd9, 0x78, 0xf9, 0xc4, 0x19, 0xdd, 0xb5, 0xed,
+ 0x28, 0xe9, 0xfd, 0x79, 0x4a, 0xa0, 0xd8, 0x9d,
+ 0xc6, 0x7e, 0x37, 0x83, 0x2b, 0x76, 0x53, 0x8e,
+ 0x62, 0x4c, 0x64, 0x88, 0x44, 0x8b, 0xfb, 0xa2,
+ 0x17, 0x9a, 0x59, 0xf5, 0x87, 0xb3, 0x4f, 0x13,
+ 0x61, 0x45, 0x6d, 0x8d, 0x09, 0x81, 0x7d, 0x32,
+ 0xbd, 0x8f, 0x40, 0xeb, 0x86, 0xb7, 0x7b, 0x0b,
+ 0xf0, 0x95, 0x21, 0x22, 0x5c, 0x6b, 0x4e, 0x82,
+ 0x54, 0xd6, 0x65, 0x93, 0xce, 0x60, 0xb2, 0x1c,
+ 0x73, 0x56, 0xc0, 0x14, 0xa7, 0x8c, 0xf1, 0xdc,
+ 0x12, 0x75, 0xca, 0x1f, 0x3b, 0xbe, 0xe4, 0xd1,
+ 0x42, 0x3d, 0xd4, 0x30, 0xa3, 0x3c, 0xb6, 0x26,
+ 0x6f, 0xbf, 0x0e, 0xda, 0x46, 0x69, 0x07, 0x57,
+ 0x27, 0xf2, 0x1d, 0x9b, 0xbc, 0x94, 0x43, 0x03,
+ 0xf8, 0x11, 0xc7, 0xf6, 0x90, 0xef, 0x3e, 0xe7,
+ 0x06, 0xc3, 0xd5, 0x2f, 0xc8, 0x66, 0x1e, 0xd7,
+ 0x08, 0xe8, 0xea, 0xde, 0x80, 0x52, 0xee, 0xf7,
+ 0x84, 0xaa, 0x72, 0xac, 0x35, 0x4d, 0x6a, 0x2a,
+ 0x96, 0x1a, 0xd2, 0x71, 0x5a, 0x15, 0x49, 0x74,
+ 0x4b, 0x9f, 0xd0, 0x5e, 0x04, 0x18, 0xa4, 0xec,
+ 0xc2, 0xe0, 0x41, 0x6e, 0x0f, 0x51, 0xcb, 0xcc,
+ 0x24, 0x91, 0xaf, 0x50, 0xa1, 0xf4, 0x70, 0x39,
+ 0x99, 0x7c, 0x3a, 0x85, 0x23, 0xb8, 0xb4, 0x7a,
+ 0xfc, 0x02, 0x36, 0x5b, 0x25, 0x55, 0x97, 0x31,
+ 0x2d, 0x5d, 0xfa, 0x98, 0xe3, 0x8a, 0x92, 0xae,
+ 0x05, 0xdf, 0x29, 0x10, 0x67, 0x6c, 0xba, 0xc9,
+ 0xd3, 0x00, 0xe6, 0xcf, 0xe1, 0x9e, 0xa8, 0x2c,
+ 0x63, 0x16, 0x01, 0x3f, 0x58, 0xe2, 0x89, 0xa9,
+ 0x0d, 0x38, 0x34, 0x1b, 0xab, 0x33, 0xff, 0xb0,
+ 0xbb, 0x48, 0x0c, 0x5f, 0xb9, 0xb1, 0xcd, 0x2e,
+ 0xc5, 0xf3, 0xdb, 0x47, 0xe5, 0xa5, 0x9c, 0x77,
+ 0x0a, 0xa6, 0x20, 0x68, 0xfe, 0x7f, 0xc1, 0xad
+};
+
+/*----- Main code ---------------------------------------------------------*/
+
+/* --- @rc2_braindamage@ --- *
+ *
+ * Arguments: @rc2_ctx *k@ = pointer to context to initialize
+ * @const void *buf@ = pointer to key material
+ * @size_t sz@ = size of key material in bytes
+ * @unsigned eb@ = desired effective key size, in bits
+ *
+ * Returns: ---
+ *
+ * Use: Initializes an RC2 expanded key, and braindamages it to the
+ * requested effective key size. This is here for compatibility
+ * reasons. You should be using @rc2_init@ in normal code,
+ * which doesn't actually apply braindamage.
+ */
+
+void rc2_braindamage(rc2_ctx *k, const void *buf, size_t sz, unsigned eb)
+{
+ unsigned t8;
+ uint16 tm;
+ unsigned i;
+ uint16 *kk;
+ octet l[128];
+
+ KSZ_ASSERT(rc2, sz);
+
+ /* --- Compute the braindamage parameters --- */
+
+ t8 = (eb + 7) / 8;
+ tm = 0xff & ((1 << (8 + eb - 8 * t8)) - 1);
+
+ /* --- Copy and expand the initial key --- */
+
+ if (sz > sizeof(l))
+ sz = sizeof(l);
+ memcpy(l, buf, sz);
+
+ for (i = sz; i < sizeof(l); i++)
+ l[i] = pi[U8(l[i - 1] + l[i - sz])];
+
+ /* --- Braindamage the key --- */
+
+ i = sizeof(l) - t8;
+ l[i] = pi[l[i] & tm];
+ while (i) {
+ i--;
+ l[i] = pi[U8(l[i + 1] ^ l[i + t8])];
+ }
+
+ /* --- Write it to the key block --- */
+
+ kk = k->k;
+ for (i = 0; i < sizeof(l); i += 2)
+ *kk++ = LOAD16_L(l + i);
+ BURN(l);
+}
+
+/* --- @rc2_init@ --- *
+ *
+ * Arguments: @rc2_ctx *k@ = pointer to context to initialize
+ * @const void *buf@ = pointer to key material
+ * @size_t sz@ = size of key material in bytes
+ *
+ * Returns: ---
+ *
+ * Use: Initializes an RC2 expanded key. The effective key size is
+ * set to be equal to the real key size, in bits.
+ */
+
+void rc2_init(rc2_ctx *k, const void *buf, size_t sz)
+{
+ rc2_braindamage(k, buf, sz, sz * 8);
+}
+
+/*----- Encryption and decryption -----------------------------------------*/
+
+#define MIX(a, b, c, d, r, kk) do { \
+ a += *kk++ + (d & c) + (~d & b); \
+ a = ROL16(a, r); \
+} while (0)
+
+#define MASH(a, d, k) do { \
+ a += k[d & 63]; \
+} while (0)
+
+#define UNMIX(a, b, c, d, r, kk) do { \
+ a = ROR16(a, r); \
+ a -= *--kk + (d & c) + (~d & b); \
+} while (0)
+
+#define UNMASH(a, d, k) do { \
+ a -= k[d & 63]; \
+} while (0)
+
+/* --- @rc2_eblk@, @rc2_dblk@ --- *
+ *
+ * Arguments: @const rc2_ctx *k@ = pointer to RC2 context
+ * @const uint32 s[2]@ = pointer to source block
+ * @const uint32 d[2]@ = pointer to destination block
+ *
+ * Returns: ---
+ *
+ * Use: Low-level block encryption and decryption.
+ */
+
+void rc2_eblk(const rc2_ctx *k, const uint32 *s, uint32 *dst)
+{
+ uint16 a = U16(s[0] >> 0), b = U16(s[0] >> 16);
+ uint16 c = U16(s[1] >> 0), d = U16(s[1] >> 16);
+ const uint16 *kk = k->k;
+
+ MIX(a, b, c, d, 1, kk); MIX(b, c, d, a, 2, kk);
+ MIX(c, d, a, b, 3, kk); MIX(d, a, b, c, 5, kk);
+ MIX(a, b, c, d, 1, kk); MIX(b, c, d, a, 2, kk);
+ MIX(c, d, a, b, 3, kk); MIX(d, a, b, c, 5, kk);
+ MIX(a, b, c, d, 1, kk); MIX(b, c, d, a, 2, kk);
+ MIX(c, d, a, b, 3, kk); MIX(d, a, b, c, 5, kk);
+ MIX(a, b, c, d, 1, kk); MIX(b, c, d, a, 2, kk);
+ MIX(c, d, a, b, 3, kk); MIX(d, a, b, c, 5, kk);
+ MIX(a, b, c, d, 1, kk); MIX(b, c, d, a, 2, kk);
+ MIX(c, d, a, b, 3, kk); MIX(d, a, b, c, 5, kk);
+ MASH(a, d, k->k); MASH(b, a, k->k);
+ MASH(c, b, k->k); MASH(d, c, k->k);
+ MIX(a, b, c, d, 1, kk); MIX(b, c, d, a, 2, kk);
+ MIX(c, d, a, b, 3, kk); MIX(d, a, b, c, 5, kk);
+ MIX(a, b, c, d, 1, kk); MIX(b, c, d, a, 2, kk);
+ MIX(c, d, a, b, 3, kk); MIX(d, a, b, c, 5, kk);
+ MIX(a, b, c, d, 1, kk); MIX(b, c, d, a, 2, kk);
+ MIX(c, d, a, b, 3, kk); MIX(d, a, b, c, 5, kk);
+ MIX(a, b, c, d, 1, kk); MIX(b, c, d, a, 2, kk);
+ MIX(c, d, a, b, 3, kk); MIX(d, a, b, c, 5, kk);
+ MIX(a, b, c, d, 1, kk); MIX(b, c, d, a, 2, kk);
+ MIX(c, d, a, b, 3, kk); MIX(d, a, b, c, 5, kk);
+ MIX(a, b, c, d, 1, kk); MIX(b, c, d, a, 2, kk);
+ MIX(c, d, a, b, 3, kk); MIX(d, a, b, c, 5, kk);
+ MASH(a, d, k->k); MASH(b, a, k->k);
+ MASH(c, b, k->k); MASH(d, c, k->k);
+ MIX(a, b, c, d, 1, kk); MIX(b, c, d, a, 2, kk);
+ MIX(c, d, a, b, 3, kk); MIX(d, a, b, c, 5, kk);
+ MIX(a, b, c, d, 1, kk); MIX(b, c, d, a, 2, kk);
+ MIX(c, d, a, b, 3, kk); MIX(d, a, b, c, 5, kk);
+ MIX(a, b, c, d, 1, kk); MIX(b, c, d, a, 2, kk);
+ MIX(c, d, a, b, 3, kk); MIX(d, a, b, c, 5, kk);
+ MIX(a, b, c, d, 1, kk); MIX(b, c, d, a, 2, kk);
+ MIX(c, d, a, b, 3, kk); MIX(d, a, b, c, 5, kk);
+ MIX(a, b, c, d, 1, kk); MIX(b, c, d, a, 2, kk);
+ MIX(c, d, a, b, 3, kk); MIX(d, a, b, c, 5, kk);
+
+ dst[0] = a | (b << 16); dst[1] = c | (d << 16);
+}
+
+void rc2_dblk(const rc2_ctx *k, const uint32 *s, uint32 *dst)
+{
+ uint16 a = U16(s[0] >> 0), b = U16(s[0] >> 16);
+ uint16 c = U16(s[1] >> 0), d = U16(s[1] >> 16);
+ const uint16 *kk = k->k + 64;
+
+ UNMIX(d, a, b, c, 5, kk); UNMIX(c, d, a, b, 3, kk);
+ UNMIX(b, c, d, a, 2, kk); UNMIX(a, b, c, d, 1, kk);
+ UNMIX(d, a, b, c, 5, kk); UNMIX(c, d, a, b, 3, kk);
+ UNMIX(b, c, d, a, 2, kk); UNMIX(a, b, c, d, 1, kk);
+ UNMIX(d, a, b, c, 5, kk); UNMIX(c, d, a, b, 3, kk);
+ UNMIX(b, c, d, a, 2, kk); UNMIX(a, b, c, d, 1, kk);
+ UNMIX(d, a, b, c, 5, kk); UNMIX(c, d, a, b, 3, kk);
+ UNMIX(b, c, d, a, 2, kk); UNMIX(a, b, c, d, 1, kk);
+ UNMIX(d, a, b, c, 5, kk); UNMIX(c, d, a, b, 3, kk);
+ UNMIX(b, c, d, a, 2, kk); UNMIX(a, b, c, d, 1, kk);
+ UNMASH(d, c, k->k); UNMASH(c, b, k->k);
+ UNMASH(b, a, k->k); UNMASH(a, d, k->k);
+ UNMIX(d, a, b, c, 5, kk); UNMIX(c, d, a, b, 3, kk);
+ UNMIX(b, c, d, a, 2, kk); UNMIX(a, b, c, d, 1, kk);
+ UNMIX(d, a, b, c, 5, kk); UNMIX(c, d, a, b, 3, kk);
+ UNMIX(b, c, d, a, 2, kk); UNMIX(a, b, c, d, 1, kk);
+ UNMIX(d, a, b, c, 5, kk); UNMIX(c, d, a, b, 3, kk);
+ UNMIX(b, c, d, a, 2, kk); UNMIX(a, b, c, d, 1, kk);
+ UNMIX(d, a, b, c, 5, kk); UNMIX(c, d, a, b, 3, kk);
+ UNMIX(b, c, d, a, 2, kk); UNMIX(a, b, c, d, 1, kk);
+ UNMIX(d, a, b, c, 5, kk); UNMIX(c, d, a, b, 3, kk);
+ UNMIX(b, c, d, a, 2, kk); UNMIX(a, b, c, d, 1, kk);
+ UNMIX(d, a, b, c, 5, kk); UNMIX(c, d, a, b, 3, kk);
+ UNMIX(b, c, d, a, 2, kk); UNMIX(a, b, c, d, 1, kk);
+ UNMASH(d, c, k->k); UNMASH(c, b, k->k);
+ UNMASH(b, a, k->k); UNMASH(a, d, k->k);
+ UNMIX(d, a, b, c, 5, kk); UNMIX(c, d, a, b, 3, kk);
+ UNMIX(b, c, d, a, 2, kk); UNMIX(a, b, c, d, 1, kk);
+ UNMIX(d, a, b, c, 5, kk); UNMIX(c, d, a, b, 3, kk);
+ UNMIX(b, c, d, a, 2, kk); UNMIX(a, b, c, d, 1, kk);
+ UNMIX(d, a, b, c, 5, kk); UNMIX(c, d, a, b, 3, kk);
+ UNMIX(b, c, d, a, 2, kk); UNMIX(a, b, c, d, 1, kk);
+ UNMIX(d, a, b, c, 5, kk); UNMIX(c, d, a, b, 3, kk);
+ UNMIX(b, c, d, a, 2, kk); UNMIX(a, b, c, d, 1, kk);
+ UNMIX(d, a, b, c, 5, kk); UNMIX(c, d, a, b, 3, kk);
+ UNMIX(b, c, d, a, 2, kk); UNMIX(a, b, c, d, 1, kk);
+
+ dst[0] = a | (b << 16); dst[1] = c | (d << 16);
+}
+
+/*----- Custom test rig ---------------------------------------------------*
+ *
+ * I need to test the braindamage feature.
+ */
+
+#ifdef TEST_RIG
+
+#include <mLib/quis.h>
+#include <mLib/testrig.h>
+
+static int verify(dstr *v)
+{
+ rc2_ctx k;
+ uint32 p[RC2_BLKSZ / 4];
+ uint32 c[RC2_BLKSZ / 4];
+ uint32 d[RC2_BLKSZ / 4];
+ dstr b = DSTR_INIT;
+ unsigned bd = *(unsigned *)v[1].buf;
+ int ok = 1;
+
+ /* --- Initialize the key buffer --- */
+
+ dstr_ensure(&b, RC2_BLKSZ);
+ b.len = RC2_BLKSZ;
+ rc2_braindamage(&k, v[0].buf, v[0].len, bd);
+ BLKC_LOAD(RC2, p, v[2].buf);
+ BLKC_LOAD(RC2, c, v[3].buf);
+
+ /* --- Test encryption --- */
+
+ BLKC_MOVE(RC2, d, p);
+ rc2_eblk(&k, d, d);
+ BLKC_STORE(RC2, b.buf, d);
+ if (memcmp(b.buf, v[3].buf, RC2_BLKSZ)) {
+ ok = 0;
+ printf("\nfail encryption:"
+ "\n\tkey = ");
+ type_hex.dump(&v[0], stdout);
+ printf("\n\tbraindamage= %u", bd);
+ printf("\n\tplaintext = "); type_hex.dump(&v[2], stdout);
+ printf("\n\texpected = "); type_hex.dump(&v[3], stdout);
+ printf("\n\tcalculated = "); type_hex.dump(&b, stdout);
+ putchar('\n');
+ }
+
+ /* --- Test decryption --- */
+
+ BLKC_MOVE(RC2, d, c);
+ rc2_dblk(&k, d, d);
+ BLKC_STORE(RC2, b.buf, d);
+ if (memcmp(b.buf, v[2].buf, RC2_BLKSZ)) {
+ ok = 0;
+ printf("\nfail decryption:"
+ "\n\tkey = ");
+ type_hex.dump(&v[0], stdout);
+ printf("\n\tbraindamage= %u", bd);
+ printf("\n\tciphertext = "); type_hex.dump(&v[3], stdout);
+ printf("\n\texpected = "); type_hex.dump(&v[2], stdout);
+ printf("\n\tcalculated = "); type_hex.dump(&b, stdout);
+ putchar('\n');
+ }
+
+ /* --- Return --- */
+
+ return (ok);
+}
+
+static test_chunk defs[] = {
+ { "rc2", verify, { &type_hex, &type_int, &type_hex, &type_hex, 0 } },
+ { 0, 0, { 0 } }
+};
+
+int main(int argc, char *argv[])
+{
+ test_run(argc, argv, defs, SRCDIR"/tests/rc2");
+ return (0);
+}
+
+#endif
+
+/*----- That's all, folks -------------------------------------------------*/
projects / u / mdw / catacomb / blobdiff