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-rw-r--r--test/monniaux/BearSSL/src/symcipher/des_support.c166
1 files changed, 166 insertions, 0 deletions
diff --git a/test/monniaux/BearSSL/src/symcipher/des_support.c b/test/monniaux/BearSSL/src/symcipher/des_support.c
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+++ b/test/monniaux/BearSSL/src/symcipher/des_support.c
@@ -0,0 +1,166 @@
+/*
+ * Copyright (c) 2016 Thomas Pornin <pornin@bolet.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "inner.h"
+
+/* see inner.h */
+void
+br_des_do_IP(uint32_t *xl, uint32_t *xr)
+{
+ /*
+ * Permutation algorithm is initially from Richard Outerbridge;
+ * implementation here is adapted from Crypto++ "des.cpp" file
+ * (which is in public domain).
+ */
+ uint32_t l, r, t;
+
+ l = *xl;
+ r = *xr;
+ t = ((l >> 4) ^ r) & (uint32_t)0x0F0F0F0F;
+ r ^= t;
+ l ^= t << 4;
+ t = ((l >> 16) ^ r) & (uint32_t)0x0000FFFF;
+ r ^= t;
+ l ^= t << 16;
+ t = ((r >> 2) ^ l) & (uint32_t)0x33333333;
+ l ^= t;
+ r ^= t << 2;
+ t = ((r >> 8) ^ l) & (uint32_t)0x00FF00FF;
+ l ^= t;
+ r ^= t << 8;
+ t = ((l >> 1) ^ r) & (uint32_t)0x55555555;
+ r ^= t;
+ l ^= t << 1;
+ *xl = l;
+ *xr = r;
+}
+
+/* see inner.h */
+void
+br_des_do_invIP(uint32_t *xl, uint32_t *xr)
+{
+ /*
+ * See br_des_do_IP().
+ */
+ uint32_t l, r, t;
+
+ l = *xl;
+ r = *xr;
+ t = ((l >> 1) ^ r) & 0x55555555;
+ r ^= t;
+ l ^= t << 1;
+ t = ((r >> 8) ^ l) & 0x00FF00FF;
+ l ^= t;
+ r ^= t << 8;
+ t = ((r >> 2) ^ l) & 0x33333333;
+ l ^= t;
+ r ^= t << 2;
+ t = ((l >> 16) ^ r) & 0x0000FFFF;
+ r ^= t;
+ l ^= t << 16;
+ t = ((l >> 4) ^ r) & 0x0F0F0F0F;
+ r ^= t;
+ l ^= t << 4;
+ *xl = l;
+ *xr = r;
+}
+
+/* see inner.h */
+void
+br_des_keysched_unit(uint32_t *skey, const void *key)
+{
+ uint32_t xl, xr, kl, kr;
+ int i;
+
+ xl = br_dec32be(key);
+ xr = br_dec32be((const unsigned char *)key + 4);
+
+ /*
+ * Permutation PC-1 is quite similar to the IP permutation.
+ * Definition of IP (in FIPS 46-3 notations) is:
+ * 58 50 42 34 26 18 10 2
+ * 60 52 44 36 28 20 12 4
+ * 62 54 46 38 30 22 14 6
+ * 64 56 48 40 32 24 16 8
+ * 57 49 41 33 25 17 9 1
+ * 59 51 43 35 27 19 11 3
+ * 61 53 45 37 29 21 13 5
+ * 63 55 47 39 31 23 15 7
+ *
+ * Definition of PC-1 is:
+ * 57 49 41 33 25 17 9 1
+ * 58 50 42 34 26 18 10 2
+ * 59 51 43 35 27 19 11 3
+ * 60 52 44 36
+ * 63 55 47 39 31 23 15 7
+ * 62 54 46 38 30 22 14 6
+ * 61 53 45 37 29 21 13 5
+ * 28 20 12 4
+ */
+ br_des_do_IP(&xl, &xr);
+ kl = ((xr & (uint32_t)0xFF000000) >> 4)
+ | ((xl & (uint32_t)0xFF000000) >> 12)
+ | ((xr & (uint32_t)0x00FF0000) >> 12)
+ | ((xl & (uint32_t)0x00FF0000) >> 20);
+ kr = ((xr & (uint32_t)0x000000FF) << 20)
+ | ((xl & (uint32_t)0x0000FF00) << 4)
+ | ((xr & (uint32_t)0x0000FF00) >> 4)
+ | ((xl & (uint32_t)0x000F0000) >> 16);
+
+ /*
+ * For each round, rotate the two 28-bit words kl and kr.
+ * The extraction of the 48-bit subkey (PC-2) is not done yet.
+ */
+ for (i = 0; i < 16; i ++) {
+ if ((1 << i) & 0x8103) {
+ kl = (kl << 1) | (kl >> 27);
+ kr = (kr << 1) | (kr >> 27);
+ } else {
+ kl = (kl << 2) | (kl >> 26);
+ kr = (kr << 2) | (kr >> 26);
+ }
+ kl &= (uint32_t)0x0FFFFFFF;
+ kr &= (uint32_t)0x0FFFFFFF;
+ skey[(i << 1) + 0] = kl;
+ skey[(i << 1) + 1] = kr;
+ }
+}
+
+/* see inner.h */
+void
+br_des_rev_skey(uint32_t *skey)
+{
+ int i;
+
+ for (i = 0; i < 16; i += 2) {
+ uint32_t t;
+
+ t = skey[i + 0];
+ skey[i + 0] = skey[30 - i];
+ skey[30 - i] = t;
+ t = skey[i + 1];
+ skey[i + 1] = skey[31 - i];
+ skey[31 - i] = t;
+ }
+}