third_party/openssl: add ChaCha20+Poly1305 support.

openssl/crypto/poly1305/poly1305_arm.c

Index: openssl/crypto/poly1305/poly1305_arm.c
diff --git a/openssl/crypto/poly1305/poly1305_arm.c b/openssl/crypto/poly1305/poly1305_arm.c
new file mode 100644
index 0000000000000000000000000000000000000000..34e339d97fdbc6c56e533069e6bc6e5e5dd190c0
--- /dev/null
+++ b/openssl/crypto/poly1305/poly1305_arm.c
@@ -0,0 +1,338 @@
+/* ====================================================================
+ * Copyright (c) 2011-2013 The OpenSSL Project.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * 3. All advertising materials mentioning features or use of this
+ *    software must display the following acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
+ *
+ * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+ *    endorse or promote products derived from this software without
+ *    prior written permission. For written permission, please contact
+ *    licensing@OpenSSL.org.
+ *
+ * 5. Products derived from this software may not be called "OpenSSL"
+ *    nor may "OpenSSL" appear in their names without prior written
+ *    permission of the OpenSSL Project.
+ *
+ * 6. Redistributions of any form whatsoever must retain the following
+ *    acknowledgment:
+ *    "This product includes software developed by the OpenSSL Project
+ *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+ * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ====================================================================
+ */
+
+/* This implementation was taken from the public domain, neon2 version in
+ * SUPERCOP by D. J. Bernstein and Peter Schwabe. */
+
+#include <stdint.h>
+#include <string.h>
+
+#include <openssl/poly1305.h>
+
+#if !defined(OPENSSL_NO_POLY1305)
+
+typedef struct {
+  uint32_t v[12]; /* for alignment; only using 10 */
+} fe1305x2;
+
+#define addmulmod openssl_poly1305_neon2_addmulmod
+#define blocks openssl_poly1305_neon2_blocks
+
+extern void addmulmod(fe1305x2 *r, const fe1305x2 *x, const fe1305x2 *y, const fe1305x2 *c);
+
+extern int blocks(fe1305x2 *h, const fe1305x2 *precomp, const unsigned char *in, unsigned int inlen);
+
+static void freeze(fe1305x2 *r)
+	{
+	int i;
+
+	uint32_t x0 = r->v[0];
+	uint32_t x1 = r->v[2];
+	uint32_t x2 = r->v[4];
+	uint32_t x3 = r->v[6];
+	uint32_t x4 = r->v[8];
+	uint32_t y0;
+	uint32_t y1;
+	uint32_t y2;
+	uint32_t y3;
+	uint32_t y4;
+	uint32_t swap;
+
+	for (i = 0;i < 3;++i)
+		{
+		x1 += x0 >> 26; x0 &= 0x3ffffff;
+		x2 += x1 >> 26; x1 &= 0x3ffffff;
+		x3 += x2 >> 26; x2 &= 0x3ffffff;
+		x4 += x3 >> 26; x3 &= 0x3ffffff;
+		x0 += 5*(x4 >> 26); x4 &= 0x3ffffff;
+		}
+
+	y0 = x0 + 5;
+	y1 = x1 + (y0 >> 26); y0 &= 0x3ffffff;
+	y2 = x2 + (y1 >> 26); y1 &= 0x3ffffff;
+	y3 = x3 + (y2 >> 26); y2 &= 0x3ffffff;
+	y4 = x4 + (y3 >> 26); y3 &= 0x3ffffff;
+	swap = -(y4 >> 26); y4 &= 0x3ffffff;
+
+	y0 ^= x0;
+	y1 ^= x1;
+	y2 ^= x2;
+	y3 ^= x3;
+	y4 ^= x4;
+
+	y0 &= swap;
+	y1 &= swap;
+	y2 &= swap;
+	y3 &= swap;
+	y4 &= swap;
+
+	y0 ^= x0;
+	y1 ^= x1;
+	y2 ^= x2;
+	y3 ^= x3;
+	y4 ^= x4;
+
+	r->v[0] = y0;
+	r->v[2] = y1;
+	r->v[4] = y2;
+	r->v[6] = y3;
+	r->v[8] = y4;
+	}
+
+static void fe1305x2_tobytearray(unsigned char *r, fe1305x2 *x)
+	{
+	uint32_t x0 = x->v[0];
+	uint32_t x1 = x->v[2];
+	uint32_t x2 = x->v[4];
+	uint32_t x3 = x->v[6];
+	uint32_t x4 = x->v[8];
+
+	x1 += x0 >> 26;
+	x0 &= 0x3ffffff;
+	x2 += x1 >> 26;
+	x1 &= 0x3ffffff;
+	x3 += x2 >> 26;
+	x2 &= 0x3ffffff;
+	x4 += x3 >> 26;
+	x3 &= 0x3ffffff;
+
+	*(uint32_t *) r = x0 + (x1 << 26);
+	*(uint32_t *) (r + 4) = (x1 >> 6) + (x2 << 20);
+	*(uint32_t *) (r + 8) = (x2 >> 12) + (x3 << 14);
+	*(uint32_t *) (r + 12) = (x3 >> 18) + (x4 << 8);
+	}
+
+/* load32 exists to avoid breaking strict aliasing rules in
+ * fe1305x2_frombytearray. */
+static uint32_t load32(unsigned char *t)
+	{
+	uint32_t tmp;
+	memcpy(&tmp, t, sizeof(tmp));
+	return tmp;
+	}
+
+static void fe1305x2_frombytearray(fe1305x2 *r, const unsigned char *x, unsigned long long xlen)
+	{
+	int i;
+	unsigned char t[17];
+
+	for (i = 0; (i < 16) && (i < xlen); i++)
+		t[i] = x[i];
+	xlen -= i;
+	x += i;
+	t[i++] = 1;
+	for (; i<17; i++)
+		t[i] = 0;
+
+	r->v[0] = 0x3ffffff & load32(t);
+	r->v[2] = 0x3ffffff & (load32(t + 3) >> 2);
+	r->v[4] = 0x3ffffff & (load32(t + 6) >> 4);
+	r->v[6] = 0x3ffffff & (load32(t + 9) >> 6);
+	r->v[8] = load32(t + 13);
+
+	if (xlen)
+		{
+		for (i = 0; (i < 16) && (i < xlen); i++)
+			t[i] = x[i];
+		t[i++] = 1;
+		for (; i<17; i++)
+			t[i] = 0;
+
+		r->v[1] = 0x3ffffff & load32(t);
+		r->v[3] = 0x3ffffff & (load32(t + 3) >> 2);
+		r->v[5] = 0x3ffffff & (load32(t + 6) >> 4);
+		r->v[7] = 0x3ffffff & (load32(t + 9) >> 6);
+		r->v[9] = load32(t + 13);
+		}
+	else
+		r->v[1] = r->v[3] = r->v[5] = r->v[7] = r->v[9] = 0;
+	}
+
+static const fe1305x2 zero __attribute__ ((aligned (16)));
+
+struct poly1305_state_st {
+	unsigned char data[sizeof(fe1305x2[5]) + 128];
+	unsigned char buf[32];
+	unsigned int buf_used;
+	unsigned char key[16];
+};
+
+void CRYPTO_poly1305_init_neon(poly1305_state *state,
+			       const unsigned char key[32])
+	{
+	struct poly1305_state_st *st = (struct poly1305_state_st*) (state);
+	fe1305x2 *const r = (fe1305x2 *) (st->data + (15 & (-(int) st->data)));
+	fe1305x2 *const h = r + 1;
+	fe1305x2 *const c = h + 1;
+	fe1305x2 *const precomp = c + 1;
+	unsigned int j;
+
+	r->v[1] = r->v[0] = 0x3ffffff & *(uint32_t *) key;
+	r->v[3] = r->v[2] = 0x3ffff03 & ((*(uint32_t *) (key + 3)) >> 2);
+	r->v[5] = r->v[4] = 0x3ffc0ff & ((*(uint32_t *) (key + 6)) >> 4);
+	r->v[7] = r->v[6] = 0x3f03fff & ((*(uint32_t *) (key + 9)) >> 6);
+	r->v[9] = r->v[8] = 0x00fffff & ((*(uint32_t *) (key + 12)) >> 8);
+
+	for (j = 0; j < 10; j++)
+		h->v[j] = 0; /* XXX: should fast-forward a bit */
+
+	addmulmod(precomp,r,r,&zero);                 /* precompute r^2 */
+	addmulmod(precomp + 1,precomp,precomp,&zero); /* precompute r^4 */
+
+	memcpy(st->key, key + 16, 16);
+	st->buf_used = 0;
+	}
+
+void CRYPTO_poly1305_update_neon(poly1305_state *state, const unsigned char *in,
+				 size_t in_len)
+	{
+	struct poly1305_state_st *st = (struct poly1305_state_st*) (state);
+	fe1305x2 *const r = (fe1305x2 *) (st->data + (15 & (-(int) st->data)));
+	fe1305x2 *const h = r + 1;
+	fe1305x2 *const c = h + 1;
+	fe1305x2 *const precomp = c + 1;
+	unsigned int i;
+	unsigned char data[sizeof(fe1305x2) + 16];
+	fe1305x2 *const r2r = (fe1305x2 *) (data + (15 & (-(int) data)));
+
+	if (st->buf_used)
+		{
+		unsigned int todo = 32 - st->buf_used;
+		if (todo > in_len)
+			todo = in_len;
+		for (i = 0; i < todo; i++)
+			st->buf[st->buf_used + i] = in[i];
+		st->buf_used += todo;
+		in_len -= todo;
+		in += todo;
+
+		if (st->buf_used == sizeof(st->buf))
+			{
+			fe1305x2_frombytearray(c, st->buf, sizeof(st->buf));
+			r2r->v[0] = precomp->v[0];
+			r2r->v[2] = precomp->v[2];
+			r2r->v[4] = precomp->v[4];
+			r2r->v[6] = precomp->v[6];
+			r2r->v[8] = precomp->v[8];
+			r2r->v[1] = r->v[1];
+			r2r->v[3] = r->v[3];
+			r2r->v[5] = r->v[5];
+			r2r->v[7] = r->v[7];
+			r2r->v[9] = r->v[9];
+			addmulmod(h,h,r2r,c);
+			st->buf_used = 0;
+			}
+		}
+
+	while (in_len > 32)
+		{
+		unsigned int tlen = 1048576;
+		if (in_len < 1048576)
+			tlen = in_len;
+		tlen -= blocks(h, precomp, in, tlen);
+		in_len -= tlen;
+		in += tlen;
+		}
+
+	if (in_len)
+		{
+		for (i = 0; i < in_len; i++)
+			st->buf[i] = in[i];
+		st->buf_used = in_len;
+		}
+	}
+
+void CRYPTO_poly1305_finish_neon(poly1305_state* state, unsigned char mac[16])
+	{
+	struct poly1305_state_st *st = (struct poly1305_state_st*) (state);
+	fe1305x2 *const r = (fe1305x2 *) (st->data + (15 & (-(int) st->data)));
+	fe1305x2 *const h = r + 1;
+	fe1305x2 *const c = h + 1;
+	fe1305x2 *const precomp = c + 1;
+
+	if (st->buf_used > 16)
+		{
+		fe1305x2_frombytearray(c, st->buf, st->buf_used);
+		precomp->v[1] = r->v[1];
+		precomp->v[3] = r->v[3];
+		precomp->v[5] = r->v[5];
+		precomp->v[7] = r->v[7];
+		precomp->v[9] = r->v[9];
+		addmulmod(h,h,precomp,c);
+		}
+	else if (st->buf_used > 0)
+		{
+		fe1305x2_frombytearray(c, st->buf, st->buf_used);
+		r->v[1] = 1;
+		r->v[3] = 0;
+		r->v[5] = 0;
+		r->v[7] = 0;
+		r->v[9] = 0;
+		addmulmod(h,h,r,c);
+		}
+
+	h->v[0] += h->v[1];
+	h->v[2] += h->v[3];
+	h->v[4] += h->v[5];
+	h->v[6] += h->v[7];
+	h->v[8] += h->v[9];
+	freeze(h);
+
+	fe1305x2_frombytearray(c, st->key, 16);
+	c->v[8] ^= (1 << 24);
+
+	h->v[0] += c->v[0];
+	h->v[2] += c->v[2];
+	h->v[4] += c->v[4];
+	h->v[6] += c->v[6];
+	h->v[8] += c->v[8];
+	fe1305x2_tobytearray(mac, h);
+	}
+
+#endif  /* !OPENSSL_NO_POLY1305 */