Ashley Mills
This is a port of cyaSSL 2.7.0.
Dependents: CyaSSL_DTLS_Cellular CyaSSL_DTLS_Ethernet
Diff: ctaocrypt/src/hc128.c
- Revision:
- 0:714293de3836
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/ctaocrypt/src/hc128.c Thu Sep 05 10:33:04 2013 +0000
@@ -0,0 +1,393 @@
+/* hc128.c
+ *
+ * Copyright (C) 2006-2013 wolfSSL Inc.
+ *
+ * This file is part of CyaSSL.
+ *
+ * CyaSSL is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * CyaSSL 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#ifdef HAVE_CONFIG_H
+ #include <config.h>
+#endif
+
+#include <cyassl/ctaocrypt/settings.h>
+
+#ifdef HAVE_HC128
+
+#include <cyassl/ctaocrypt/hc128.h>
+#include <cyassl/ctaocrypt/ctaoerror2.h>
+#include <cyassl/ctaocrypt/logging.h>
+#ifdef NO_INLINE
+ #include <cyassl/ctaocrypt/hc128.h>
+ #include <cyassl/ctaocrypt/misc.h>
+#else
+ #include <ctaocrypt/src/misc.c>
+#endif
+
+
+#ifdef BIG_ENDIAN_ORDER
+ #define LITTLE32(x) ByteReverseWord32(x)
+#else
+ #define LITTLE32(x) (x)
+#endif
+
+
+/*h1 function*/
+#define h1(ctx, x, y) { \
+ byte a,c; \
+ a = (byte) (x); \
+ c = (byte) ((x) >> 16); \
+ y = (ctx->T[512+a])+(ctx->T[512+256+c]); \
+}
+
+/*h2 function*/
+#define h2(ctx, x, y) { \
+ byte a,c; \
+ a = (byte) (x); \
+ c = (byte) ((x) >> 16); \
+ y = (ctx->T[a])+(ctx->T[256+c]); \
+}
+
+/*one step of HC-128, update P and generate 32 bits keystream*/
+#define step_P(ctx,u,v,a,b,c,d,n){ \
+ word32 tem0,tem1,tem2,tem3; \
+ h1((ctx),(ctx->X[(d)]),tem3); \
+ tem0 = rotrFixed((ctx->T[(v)]),23); \
+ tem1 = rotrFixed((ctx->X[(c)]),10); \
+ tem2 = rotrFixed((ctx->X[(b)]),8); \
+ (ctx->T[(u)]) += tem2+(tem0 ^ tem1); \
+ (ctx->X[(a)]) = (ctx->T[(u)]); \
+ (n) = tem3 ^ (ctx->T[(u)]) ; \
+}
+
+/*one step of HC-128, update Q and generate 32 bits keystream*/
+#define step_Q(ctx,u,v,a,b,c,d,n){ \
+ word32 tem0,tem1,tem2,tem3; \
+ h2((ctx),(ctx->Y[(d)]),tem3); \
+ tem0 = rotrFixed((ctx->T[(v)]),(32-23)); \
+ tem1 = rotrFixed((ctx->Y[(c)]),(32-10)); \
+ tem2 = rotrFixed((ctx->Y[(b)]),(32-8)); \
+ (ctx->T[(u)]) += tem2 + (tem0 ^ tem1); \
+ (ctx->Y[(a)]) = (ctx->T[(u)]); \
+ (n) = tem3 ^ (ctx->T[(u)]) ; \
+}
+
+/*16 steps of HC-128, generate 512 bits keystream*/
+static void generate_keystream(HC128* ctx, word32* keystream)
+{
+ word32 cc,dd;
+ cc = ctx->counter1024 & 0x1ff;
+ dd = (cc+16)&0x1ff;
+
+ if (ctx->counter1024 < 512)
+ {
+ ctx->counter1024 = (ctx->counter1024 + 16) & 0x3ff;
+ step_P(ctx, cc+0, cc+1, 0, 6, 13,4, keystream[0]);
+ step_P(ctx, cc+1, cc+2, 1, 7, 14,5, keystream[1]);
+ step_P(ctx, cc+2, cc+3, 2, 8, 15,6, keystream[2]);
+ step_P(ctx, cc+3, cc+4, 3, 9, 0, 7, keystream[3]);
+ step_P(ctx, cc+4, cc+5, 4, 10,1, 8, keystream[4]);
+ step_P(ctx, cc+5, cc+6, 5, 11,2, 9, keystream[5]);
+ step_P(ctx, cc+6, cc+7, 6, 12,3, 10,keystream[6]);
+ step_P(ctx, cc+7, cc+8, 7, 13,4, 11,keystream[7]);
+ step_P(ctx, cc+8, cc+9, 8, 14,5, 12,keystream[8]);
+ step_P(ctx, cc+9, cc+10,9, 15,6, 13,keystream[9]);
+ step_P(ctx, cc+10,cc+11,10,0, 7, 14,keystream[10]);
+ step_P(ctx, cc+11,cc+12,11,1, 8, 15,keystream[11]);
+ step_P(ctx, cc+12,cc+13,12,2, 9, 0, keystream[12]);
+ step_P(ctx, cc+13,cc+14,13,3, 10,1, keystream[13]);
+ step_P(ctx, cc+14,cc+15,14,4, 11,2, keystream[14]);
+ step_P(ctx, cc+15,dd+0, 15,5, 12,3, keystream[15]);
+ }
+ else
+ {
+ ctx->counter1024 = (ctx->counter1024 + 16) & 0x3ff;
+ step_Q(ctx, 512+cc+0, 512+cc+1, 0, 6, 13,4, keystream[0]);
+ step_Q(ctx, 512+cc+1, 512+cc+2, 1, 7, 14,5, keystream[1]);
+ step_Q(ctx, 512+cc+2, 512+cc+3, 2, 8, 15,6, keystream[2]);
+ step_Q(ctx, 512+cc+3, 512+cc+4, 3, 9, 0, 7, keystream[3]);
+ step_Q(ctx, 512+cc+4, 512+cc+5, 4, 10,1, 8, keystream[4]);
+ step_Q(ctx, 512+cc+5, 512+cc+6, 5, 11,2, 9, keystream[5]);
+ step_Q(ctx, 512+cc+6, 512+cc+7, 6, 12,3, 10,keystream[6]);
+ step_Q(ctx, 512+cc+7, 512+cc+8, 7, 13,4, 11,keystream[7]);
+ step_Q(ctx, 512+cc+8, 512+cc+9, 8, 14,5, 12,keystream[8]);
+ step_Q(ctx, 512+cc+9, 512+cc+10,9, 15,6, 13,keystream[9]);
+ step_Q(ctx, 512+cc+10,512+cc+11,10,0, 7, 14,keystream[10]);
+ step_Q(ctx, 512+cc+11,512+cc+12,11,1, 8, 15,keystream[11]);
+ step_Q(ctx, 512+cc+12,512+cc+13,12,2, 9, 0, keystream[12]);
+ step_Q(ctx, 512+cc+13,512+cc+14,13,3, 10,1, keystream[13]);
+ step_Q(ctx, 512+cc+14,512+cc+15,14,4, 11,2, keystream[14]);
+ step_Q(ctx, 512+cc+15,512+dd+0, 15,5, 12,3, keystream[15]);
+ }
+}
+
+
+/* The following defines the initialization functions */
+#define f1(x) (rotrFixed((x),7) ^ rotrFixed((x),18) ^ ((x) >> 3))
+#define f2(x) (rotrFixed((x),17) ^ rotrFixed((x),19) ^ ((x) >> 10))
+
+/*update table P*/
+#define update_P(ctx,u,v,a,b,c,d){ \
+ word32 tem0,tem1,tem2,tem3; \
+ tem0 = rotrFixed((ctx->T[(v)]),23); \
+ tem1 = rotrFixed((ctx->X[(c)]),10); \
+ tem2 = rotrFixed((ctx->X[(b)]),8); \
+ h1((ctx),(ctx->X[(d)]),tem3); \
+ (ctx->T[(u)]) = ((ctx->T[(u)]) + tem2+(tem0^tem1)) ^ tem3; \
+ (ctx->X[(a)]) = (ctx->T[(u)]); \
+}
+
+/*update table Q*/
+#define update_Q(ctx,u,v,a,b,c,d){ \
+ word32 tem0,tem1,tem2,tem3; \
+ tem0 = rotrFixed((ctx->T[(v)]),(32-23)); \
+ tem1 = rotrFixed((ctx->Y[(c)]),(32-10)); \
+ tem2 = rotrFixed((ctx->Y[(b)]),(32-8)); \
+ h2((ctx),(ctx->Y[(d)]),tem3); \
+ (ctx->T[(u)]) = ((ctx->T[(u)]) + tem2+(tem0^tem1)) ^ tem3; \
+ (ctx->Y[(a)]) = (ctx->T[(u)]); \
+}
+
+/*16 steps of HC-128, without generating keystream, */
+/*but use the outputs to update P and Q*/
+static void setup_update(HC128* ctx) /*each time 16 steps*/
+{
+ word32 cc,dd;
+ cc = ctx->counter1024 & 0x1ff;
+ dd = (cc+16)&0x1ff;
+
+ if (ctx->counter1024 < 512)
+ {
+ ctx->counter1024 = (ctx->counter1024 + 16) & 0x3ff;
+ update_P(ctx, cc+0, cc+1, 0, 6, 13, 4);
+ update_P(ctx, cc+1, cc+2, 1, 7, 14, 5);
+ update_P(ctx, cc+2, cc+3, 2, 8, 15, 6);
+ update_P(ctx, cc+3, cc+4, 3, 9, 0, 7);
+ update_P(ctx, cc+4, cc+5, 4, 10,1, 8);
+ update_P(ctx, cc+5, cc+6, 5, 11,2, 9);
+ update_P(ctx, cc+6, cc+7, 6, 12,3, 10);
+ update_P(ctx, cc+7, cc+8, 7, 13,4, 11);
+ update_P(ctx, cc+8, cc+9, 8, 14,5, 12);
+ update_P(ctx, cc+9, cc+10,9, 15,6, 13);
+ update_P(ctx, cc+10,cc+11,10,0, 7, 14);
+ update_P(ctx, cc+11,cc+12,11,1, 8, 15);
+ update_P(ctx, cc+12,cc+13,12,2, 9, 0);
+ update_P(ctx, cc+13,cc+14,13,3, 10, 1);
+ update_P(ctx, cc+14,cc+15,14,4, 11, 2);
+ update_P(ctx, cc+15,dd+0, 15,5, 12, 3);
+ }
+ else
+ {
+ ctx->counter1024 = (ctx->counter1024 + 16) & 0x3ff;
+ update_Q(ctx, 512+cc+0, 512+cc+1, 0, 6, 13, 4);
+ update_Q(ctx, 512+cc+1, 512+cc+2, 1, 7, 14, 5);
+ update_Q(ctx, 512+cc+2, 512+cc+3, 2, 8, 15, 6);
+ update_Q(ctx, 512+cc+3, 512+cc+4, 3, 9, 0, 7);
+ update_Q(ctx, 512+cc+4, 512+cc+5, 4, 10,1, 8);
+ update_Q(ctx, 512+cc+5, 512+cc+6, 5, 11,2, 9);
+ update_Q(ctx, 512+cc+6, 512+cc+7, 6, 12,3, 10);
+ update_Q(ctx, 512+cc+7, 512+cc+8, 7, 13,4, 11);
+ update_Q(ctx, 512+cc+8, 512+cc+9, 8, 14,5, 12);
+ update_Q(ctx, 512+cc+9, 512+cc+10,9, 15,6, 13);
+ update_Q(ctx, 512+cc+10,512+cc+11,10,0, 7, 14);
+ update_Q(ctx, 512+cc+11,512+cc+12,11,1, 8, 15);
+ update_Q(ctx, 512+cc+12,512+cc+13,12,2, 9, 0);
+ update_Q(ctx, 512+cc+13,512+cc+14,13,3, 10, 1);
+ update_Q(ctx, 512+cc+14,512+cc+15,14,4, 11, 2);
+ update_Q(ctx, 512+cc+15,512+dd+0, 15,5, 12, 3);
+ }
+}
+
+
+/* for the 128-bit key: key[0]...key[15]
+* key[0] is the least significant byte of ctx->key[0] (K_0);
+* key[3] is the most significant byte of ctx->key[0] (K_0);
+* ...
+* key[12] is the least significant byte of ctx->key[3] (K_3)
+* key[15] is the most significant byte of ctx->key[3] (K_3)
+*
+* for the 128-bit iv: iv[0]...iv[15]
+* iv[0] is the least significant byte of ctx->iv[0] (IV_0);
+* iv[3] is the most significant byte of ctx->iv[0] (IV_0);
+* ...
+* iv[12] is the least significant byte of ctx->iv[3] (IV_3)
+* iv[15] is the most significant byte of ctx->iv[3] (IV_3)
+*/
+
+
+
+static void Hc128_SetIV(HC128* ctx, const byte* iv)
+{
+ word32 i;
+
+ for (i = 0; i < (128 >> 5); i++)
+ ctx->iv[i] = LITTLE32(((word32*)iv)[i]);
+
+ for (; i < 8; i++) ctx->iv[i] = ctx->iv[i-4];
+
+ /* expand the key and IV into the table T */
+ /* (expand the key and IV into the table P and Q) */
+
+ for (i = 0; i < 8; i++) ctx->T[i] = ctx->key[i];
+ for (i = 8; i < 16; i++) ctx->T[i] = ctx->iv[i-8];
+
+ for (i = 16; i < (256+16); i++)
+ ctx->T[i] = f2(ctx->T[i-2]) + ctx->T[i-7] + f1(ctx->T[i-15]) +
+ ctx->T[i-16]+i;
+
+ for (i = 0; i < 16; i++) ctx->T[i] = ctx->T[256+i];
+
+ for (i = 16; i < 1024; i++)
+ ctx->T[i] = f2(ctx->T[i-2]) + ctx->T[i-7] + f1(ctx->T[i-15]) +
+ ctx->T[i-16]+256+i;
+
+ /* initialize counter1024, X and Y */
+ ctx->counter1024 = 0;
+ for (i = 0; i < 16; i++) ctx->X[i] = ctx->T[512-16+i];
+ for (i = 0; i < 16; i++) ctx->Y[i] = ctx->T[512+512-16+i];
+
+ /* run the cipher 1024 steps before generating the output */
+ for (i = 0; i < 64; i++) setup_update(ctx);
+}
+
+
+static INLINE int DoKey(HC128* ctx, const byte* key, const byte* iv)
+{
+ word32 i;
+
+ /* Key size in bits 128 */
+ for (i = 0; i < (128 >> 5); i++)
+ ctx->key[i] = LITTLE32(((word32*)key)[i]);
+
+ for ( ; i < 8 ; i++) ctx->key[i] = ctx->key[i-4];
+
+ Hc128_SetIV(ctx, iv);
+
+ return 0;
+}
+
+
+/* Key setup */
+int Hc128_SetKey(HC128* ctx, const byte* key, const byte* iv)
+{
+#ifdef XSTREAM_ALIGN
+ if ((word)key % 4 || (word)iv % 4) {
+ int alignKey[4];
+ int alignIv[4];
+
+ CYASSL_MSG("Hc128SetKey unaligned key/iv");
+
+ XMEMCPY(alignKey, key, sizeof(alignKey));
+ XMEMCPY(alignIv, iv, sizeof(alignIv));
+
+ return DoKey(ctx, (const byte*)alignKey, (const byte*)alignIv);
+ }
+#endif /* XSTREAM_ALIGN */
+
+ return DoKey(ctx, key, iv);
+}
+
+
+
+/* The following defines the encryption of data stream */
+static INLINE int DoProcess(HC128* ctx, byte* output, const byte* input,
+ word32 msglen)
+{
+ word32 i, keystream[16];
+
+ for ( ; msglen >= 64; msglen -= 64, input += 64, output += 64)
+ {
+ generate_keystream(ctx, keystream);
+
+ /* unroll loop */
+ ((word32*)output)[0] = ((word32*)input)[0] ^ LITTLE32(keystream[0]);
+ ((word32*)output)[1] = ((word32*)input)[1] ^ LITTLE32(keystream[1]);
+ ((word32*)output)[2] = ((word32*)input)[2] ^ LITTLE32(keystream[2]);
+ ((word32*)output)[3] = ((word32*)input)[3] ^ LITTLE32(keystream[3]);
+ ((word32*)output)[4] = ((word32*)input)[4] ^ LITTLE32(keystream[4]);
+ ((word32*)output)[5] = ((word32*)input)[5] ^ LITTLE32(keystream[5]);
+ ((word32*)output)[6] = ((word32*)input)[6] ^ LITTLE32(keystream[6]);
+ ((word32*)output)[7] = ((word32*)input)[7] ^ LITTLE32(keystream[7]);
+ ((word32*)output)[8] = ((word32*)input)[8] ^ LITTLE32(keystream[8]);
+ ((word32*)output)[9] = ((word32*)input)[9] ^ LITTLE32(keystream[9]);
+ ((word32*)output)[10] = ((word32*)input)[10] ^ LITTLE32(keystream[10]);
+ ((word32*)output)[11] = ((word32*)input)[11] ^ LITTLE32(keystream[11]);
+ ((word32*)output)[12] = ((word32*)input)[12] ^ LITTLE32(keystream[12]);
+ ((word32*)output)[13] = ((word32*)input)[13] ^ LITTLE32(keystream[13]);
+ ((word32*)output)[14] = ((word32*)input)[14] ^ LITTLE32(keystream[14]);
+ ((word32*)output)[15] = ((word32*)input)[15] ^ LITTLE32(keystream[15]);
+ }
+
+ if (msglen > 0)
+ {
+ generate_keystream(ctx, keystream);
+
+#ifdef BIG_ENDIAN_ORDER
+ {
+ word32 wordsLeft = msglen / sizeof(word32);
+ if (msglen % sizeof(word32)) wordsLeft++;
+
+ ByteReverseWords(keystream, keystream, wordsLeft * sizeof(word32));
+ }
+#endif
+
+ for (i = 0; i < msglen; i++)
+ output[i] = input[i] ^ ((byte*)keystream)[i];
+ }
+
+ return 0;
+}
+
+
+/* Encrypt/decrypt a message of any size */
+int Hc128_Process(HC128* ctx, byte* output, const byte* input, word32 msglen)
+{
+#ifdef XSTREAM_ALIGN
+ if ((word)input % 4 || (word)output % 4) {
+ #ifndef NO_CYASSL_ALLOC_ALIGN
+ byte* tmp;
+ CYASSL_MSG("Hc128Process unaligned");
+
+ tmp = (byte*)XMALLOC(msglen, NULL, DYNAMIC_TYPE_TMP_BUFFER);
+ if (tmp == NULL) return MEMORY_E;
+
+ XMEMCPY(tmp, input, msglen);
+ DoProcess(ctx, tmp, tmp, msglen);
+ XMEMCPY(output, tmp, msglen);
+
+ XFREE(tmp, NULL, DYNAMIC_TYPE_TMP_BUFFER);
+
+ return 0;
+ #else
+ return BAD_ALIGN_E;
+ #endif
+ }
+#endif /* XSTREAM_ALIGN */
+
+ return DoProcess(ctx, output, input, msglen);
+}
+
+
+#else /* HAVE_HC128 */
+
+
+#ifdef _MSC_VER
+ /* 4206 warning for blank file */
+ #pragma warning(disable: 4206)
+#endif
+
+
+#endif /* HAVE_HC128 */
