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-rw-r--r--code/core/crypto/chacha/Makefile14
-rw-r--r--code/core/crypto/chacha/chacha-merged.c270
-rw-r--r--code/core/crypto/chacha/chacha.c77
3 files changed, 361 insertions, 0 deletions
diff --git a/code/core/crypto/chacha/Makefile b/code/core/crypto/chacha/Makefile
new file mode 100644
index 0000000..dae3373
--- /dev/null
+++ b/code/core/crypto/chacha/Makefile
@@ -0,0 +1,14 @@
+CFLAGS=-I../include -D__BEGIN_HIDDEN_DECLS= -D__END_HIDDEN_DECLS= -O3 $(PIC)
+obj = chacha.o
+
+all: libchacha.a
+dep: all
+
+%.o: %.c
+ $(CC) $(CFLAGS) -c $<
+
+libchacha.a: $(obj)
+ $(AR) rcs $@ $(obj)
+
+clean:
+ rm -f *.o *.a
diff --git a/code/core/crypto/chacha/chacha-merged.c b/code/core/crypto/chacha/chacha-merged.c
new file mode 100644
index 0000000..557dfd5
--- /dev/null
+++ b/code/core/crypto/chacha/chacha-merged.c
@@ -0,0 +1,270 @@
+/* $OpenBSD: chacha-merged.c,v 1.7 2014/07/11 08:47:47 bcook Exp $ */
+/*
+chacha-merged.c version 20080118
+D. J. Bernstein
+Public domain.
+*/
+
+#include <sys/types.h>
+
+#include <stdint.h>
+
+#define CHACHA_MINKEYLEN 16
+#define CHACHA_NONCELEN 8
+#define CHACHA_CTRLEN 8
+#define CHACHA_STATELEN (CHACHA_NONCELEN+CHACHA_CTRLEN)
+#define CHACHA_BLOCKLEN 64
+
+struct chacha_ctx {
+ u_int input[16];
+ uint8_t ks[CHACHA_BLOCKLEN];
+ uint8_t unused;
+};
+
+static inline void chacha_keysetup(struct chacha_ctx *x, const u_char *k,
+ u_int kbits)
+ __attribute__((__bounded__(__minbytes__, 2, CHACHA_MINKEYLEN)));
+static inline void chacha_ivsetup(struct chacha_ctx *x, const u_char *iv,
+ const u_char *ctr)
+ __attribute__((__bounded__(__minbytes__, 2, CHACHA_NONCELEN)))
+ __attribute__((__bounded__(__minbytes__, 3, CHACHA_CTRLEN)));
+static inline void chacha_encrypt_bytes(struct chacha_ctx *x, const u_char *m,
+ u_char *c, u_int bytes)
+ __attribute__((__bounded__(__buffer__, 2, 4)))
+ __attribute__((__bounded__(__buffer__, 3, 4)));
+
+typedef unsigned char u8;
+typedef unsigned int u32;
+
+typedef struct chacha_ctx chacha_ctx;
+
+#define U8C(v) (v##U)
+#define U32C(v) (v##U)
+
+#define U8V(v) ((u8)(v) & U8C(0xFF))
+#define U32V(v) ((u32)(v) & U32C(0xFFFFFFFF))
+
+#define ROTL32(v, n) \
+ (U32V((v) << (n)) | ((v) >> (32 - (n))))
+
+#define U8TO32_LITTLE(p) \
+ (((u32)((p)[0])) | \
+ ((u32)((p)[1]) << 8) | \
+ ((u32)((p)[2]) << 16) | \
+ ((u32)((p)[3]) << 24))
+
+#define U32TO8_LITTLE(p, v) \
+ do { \
+ (p)[0] = U8V((v)); \
+ (p)[1] = U8V((v) >> 8); \
+ (p)[2] = U8V((v) >> 16); \
+ (p)[3] = U8V((v) >> 24); \
+ } while (0)
+
+#define ROTATE(v,c) (ROTL32(v,c))
+#define XOR(v,w) ((v) ^ (w))
+#define PLUS(v,w) (U32V((v) + (w)))
+#define PLUSONE(v) (PLUS((v),1))
+
+#define QUARTERROUND(a,b,c,d) \
+ a = PLUS(a,b); d = ROTATE(XOR(d,a),16); \
+ c = PLUS(c,d); b = ROTATE(XOR(b,c),12); \
+ a = PLUS(a,b); d = ROTATE(XOR(d,a), 8); \
+ c = PLUS(c,d); b = ROTATE(XOR(b,c), 7);
+
+static const char sigma[16] = "expand 32-byte k";
+static const char tau[16] = "expand 16-byte k";
+
+static inline void
+chacha_keysetup(chacha_ctx *x, const u8 *k, u32 kbits)
+{
+ const char *constants;
+
+ x->input[4] = U8TO32_LITTLE(k + 0);
+ x->input[5] = U8TO32_LITTLE(k + 4);
+ x->input[6] = U8TO32_LITTLE(k + 8);
+ x->input[7] = U8TO32_LITTLE(k + 12);
+ if (kbits == 256) { /* recommended */
+ k += 16;
+ constants = sigma;
+ } else { /* kbits == 128 */
+ constants = tau;
+ }
+ x->input[8] = U8TO32_LITTLE(k + 0);
+ x->input[9] = U8TO32_LITTLE(k + 4);
+ x->input[10] = U8TO32_LITTLE(k + 8);
+ x->input[11] = U8TO32_LITTLE(k + 12);
+ x->input[0] = U8TO32_LITTLE(constants + 0);
+ x->input[1] = U8TO32_LITTLE(constants + 4);
+ x->input[2] = U8TO32_LITTLE(constants + 8);
+ x->input[3] = U8TO32_LITTLE(constants + 12);
+}
+
+static inline void
+chacha_ivsetup(chacha_ctx *x, const u8 *iv, const u8 *counter)
+{
+ x->input[12] = counter == NULL ? 0 : U8TO32_LITTLE(counter + 0);
+ x->input[13] = counter == NULL ? 0 : U8TO32_LITTLE(counter + 4);
+ x->input[14] = U8TO32_LITTLE(iv + 0);
+ x->input[15] = U8TO32_LITTLE(iv + 4);
+}
+
+static inline void
+chacha_encrypt_bytes(chacha_ctx *x, const u8 *m, u8 *c, u32 bytes)
+{
+ u32 x0, x1, x2, x3, x4, x5, x6, x7;
+ u32 x8, x9, x10, x11, x12, x13, x14, x15;
+ u32 j0, j1, j2, j3, j4, j5, j6, j7;
+ u32 j8, j9, j10, j11, j12, j13, j14, j15;
+ u8 *ctarget = NULL;
+ u8 tmp[64];
+ u_int i;
+
+ if (!bytes)
+ return;
+
+ j0 = x->input[0];
+ j1 = x->input[1];
+ j2 = x->input[2];
+ j3 = x->input[3];
+ j4 = x->input[4];
+ j5 = x->input[5];
+ j6 = x->input[6];
+ j7 = x->input[7];
+ j8 = x->input[8];
+ j9 = x->input[9];
+ j10 = x->input[10];
+ j11 = x->input[11];
+ j12 = x->input[12];
+ j13 = x->input[13];
+ j14 = x->input[14];
+ j15 = x->input[15];
+
+ for (;;) {
+ if (bytes < 64) {
+ for (i = 0; i < bytes; ++i)
+ tmp[i] = m[i];
+ m = tmp;
+ ctarget = c;
+ c = tmp;
+ }
+ x0 = j0;
+ x1 = j1;
+ x2 = j2;
+ x3 = j3;
+ x4 = j4;
+ x5 = j5;
+ x6 = j6;
+ x7 = j7;
+ x8 = j8;
+ x9 = j9;
+ x10 = j10;
+ x11 = j11;
+ x12 = j12;
+ x13 = j13;
+ x14 = j14;
+ x15 = j15;
+ for (i = 20; i > 0; i -= 2) {
+ QUARTERROUND(x0, x4, x8, x12)
+ QUARTERROUND(x1, x5, x9, x13)
+ QUARTERROUND(x2, x6, x10, x14)
+ QUARTERROUND(x3, x7, x11, x15)
+ QUARTERROUND(x0, x5, x10, x15)
+ QUARTERROUND(x1, x6, x11, x12)
+ QUARTERROUND(x2, x7, x8, x13)
+ QUARTERROUND(x3, x4, x9, x14)
+ }
+ x0 = PLUS(x0, j0);
+ x1 = PLUS(x1, j1);
+ x2 = PLUS(x2, j2);
+ x3 = PLUS(x3, j3);
+ x4 = PLUS(x4, j4);
+ x5 = PLUS(x5, j5);
+ x6 = PLUS(x6, j6);
+ x7 = PLUS(x7, j7);
+ x8 = PLUS(x8, j8);
+ x9 = PLUS(x9, j9);
+ x10 = PLUS(x10, j10);
+ x11 = PLUS(x11, j11);
+ x12 = PLUS(x12, j12);
+ x13 = PLUS(x13, j13);
+ x14 = PLUS(x14, j14);
+ x15 = PLUS(x15, j15);
+
+ if (bytes < 64) {
+ U32TO8_LITTLE(x->ks + 0, x0);
+ U32TO8_LITTLE(x->ks + 4, x1);
+ U32TO8_LITTLE(x->ks + 8, x2);
+ U32TO8_LITTLE(x->ks + 12, x3);
+ U32TO8_LITTLE(x->ks + 16, x4);
+ U32TO8_LITTLE(x->ks + 20, x5);
+ U32TO8_LITTLE(x->ks + 24, x6);
+ U32TO8_LITTLE(x->ks + 28, x7);
+ U32TO8_LITTLE(x->ks + 32, x8);
+ U32TO8_LITTLE(x->ks + 36, x9);
+ U32TO8_LITTLE(x->ks + 40, x10);
+ U32TO8_LITTLE(x->ks + 44, x11);
+ U32TO8_LITTLE(x->ks + 48, x12);
+ U32TO8_LITTLE(x->ks + 52, x13);
+ U32TO8_LITTLE(x->ks + 56, x14);
+ U32TO8_LITTLE(x->ks + 60, x15);
+ }
+
+ x0 = XOR(x0, U8TO32_LITTLE(m + 0));
+ x1 = XOR(x1, U8TO32_LITTLE(m + 4));
+ x2 = XOR(x2, U8TO32_LITTLE(m + 8));
+ x3 = XOR(x3, U8TO32_LITTLE(m + 12));
+ x4 = XOR(x4, U8TO32_LITTLE(m + 16));
+ x5 = XOR(x5, U8TO32_LITTLE(m + 20));
+ x6 = XOR(x6, U8TO32_LITTLE(m + 24));
+ x7 = XOR(x7, U8TO32_LITTLE(m + 28));
+ x8 = XOR(x8, U8TO32_LITTLE(m + 32));
+ x9 = XOR(x9, U8TO32_LITTLE(m + 36));
+ x10 = XOR(x10, U8TO32_LITTLE(m + 40));
+ x11 = XOR(x11, U8TO32_LITTLE(m + 44));
+ x12 = XOR(x12, U8TO32_LITTLE(m + 48));
+ x13 = XOR(x13, U8TO32_LITTLE(m + 52));
+ x14 = XOR(x14, U8TO32_LITTLE(m + 56));
+ x15 = XOR(x15, U8TO32_LITTLE(m + 60));
+
+ j12 = PLUSONE(j12);
+ if (!j12) {
+ j13 = PLUSONE(j13);
+ /*
+ * Stopping at 2^70 bytes per nonce is the user's
+ * responsibility.
+ */
+ }
+
+ U32TO8_LITTLE(c + 0, x0);
+ U32TO8_LITTLE(c + 4, x1);
+ U32TO8_LITTLE(c + 8, x2);
+ U32TO8_LITTLE(c + 12, x3);
+ U32TO8_LITTLE(c + 16, x4);
+ U32TO8_LITTLE(c + 20, x5);
+ U32TO8_LITTLE(c + 24, x6);
+ U32TO8_LITTLE(c + 28, x7);
+ U32TO8_LITTLE(c + 32, x8);
+ U32TO8_LITTLE(c + 36, x9);
+ U32TO8_LITTLE(c + 40, x10);
+ U32TO8_LITTLE(c + 44, x11);
+ U32TO8_LITTLE(c + 48, x12);
+ U32TO8_LITTLE(c + 52, x13);
+ U32TO8_LITTLE(c + 56, x14);
+ U32TO8_LITTLE(c + 60, x15);
+
+ if (bytes <= 64) {
+ if (bytes < 64) {
+ for (i = 0; i < bytes; ++i)
+ ctarget[i] = c[i];
+ }
+ x->input[12] = j12;
+ x->input[13] = j13;
+ x->unused = 64 - bytes;
+ return;
+ }
+ bytes -= 64;
+ c += 64;
+ m += 64;
+ }
+}
diff --git a/code/core/crypto/chacha/chacha.c b/code/core/crypto/chacha/chacha.c
new file mode 100644
index 0000000..fba03c9
--- /dev/null
+++ b/code/core/crypto/chacha/chacha.c
@@ -0,0 +1,77 @@
+/* $OpenBSD: chacha.c,v 1.7 2015/12/09 14:07:55 bcook Exp $ */
+/*
+ * Copyright (c) 2014 Joel Sing <jsing@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <stdint.h>
+
+#include <chacha.h>
+
+#include "chacha-merged.c"
+
+void
+ChaCha_set_key(ChaCha_ctx *ctx, const unsigned char *key, uint32_t keybits)
+{
+ chacha_keysetup((chacha_ctx *)ctx, key, keybits);
+ ctx->unused = 0;
+}
+
+void
+ChaCha_set_iv(ChaCha_ctx *ctx, const unsigned char *iv,
+ const unsigned char *counter)
+{
+ chacha_ivsetup((chacha_ctx *)ctx, iv, counter);
+ ctx->unused = 0;
+}
+
+void
+ChaCha(ChaCha_ctx *ctx, unsigned char *out, const unsigned char *in, size_t len)
+{
+ unsigned char *k;
+ int i, l;
+
+ /* Consume remaining keystream, if any exists. */
+ if (ctx->unused > 0) {
+ k = ctx->ks + 64 - ctx->unused;
+ l = (len > ctx->unused) ? ctx->unused : len;
+ for (i = 0; i < l; i++)
+ *(out++) = *(in++) ^ *(k++);
+ ctx->unused -= l;
+ len -= l;
+ }
+
+ chacha_encrypt_bytes((chacha_ctx *)ctx, in, out, (uint32_t)len);
+}
+
+void
+CRYPTO_chacha_20(unsigned char *out, const unsigned char *in, size_t len,
+ const unsigned char key[32], const unsigned char iv[8], uint64_t counter)
+{
+ struct chacha_ctx ctx;
+
+ /*
+ * chacha_ivsetup expects the counter to be in u8. Rather than
+ * converting size_t to u8 and then back again, pass a counter of
+ * NULL and manually assign it afterwards.
+ */
+ chacha_keysetup(&ctx, key, 256);
+ chacha_ivsetup(&ctx, iv, NULL);
+ if (counter != 0) {
+ ctx.input[12] = (uint32_t)counter;
+ ctx.input[13] = (uint32_t)(counter >> 32);
+ }
+
+ chacha_encrypt_bytes(&ctx, in, out, (uint32_t)len);
+}
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