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diff --git a/comm/third_party/libgcrypt/cipher/bufhelp.h b/comm/third_party/libgcrypt/cipher/bufhelp.h
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+/* bufhelp.h - Some buffer manipulation helpers
+ * Copyright (C) 2012-2017 Jussi Kivilinna <jussi.kivilinna@iki.fi>
+ *
+ * This file is part of Libgcrypt.
+ *
+ * Libgcrypt is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * Libgcrypt 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef GCRYPT_BUFHELP_H
+#define GCRYPT_BUFHELP_H
+
+
+#include "g10lib.h"
+#include "bithelp.h"
+
+
+#undef BUFHELP_UNALIGNED_ACCESS
+#if defined(HAVE_GCC_ATTRIBUTE_PACKED) && \
+ defined(HAVE_GCC_ATTRIBUTE_ALIGNED) && \
+ defined(HAVE_GCC_ATTRIBUTE_MAY_ALIAS)
+/* Compiler is supports attributes needed for automatically issuing unaligned
+ memory access instructions.
+ */
+# define BUFHELP_UNALIGNED_ACCESS 1
+#endif
+
+
+#ifndef BUFHELP_UNALIGNED_ACCESS
+
+/* Functions for loading and storing unaligned u32 values of different
+ endianness. */
+static inline u32 buf_get_be32(const void *_buf)
+{
+ const byte *in = _buf;
+ return ((u32)in[0] << 24) | ((u32)in[1] << 16) | \
+ ((u32)in[2] << 8) | (u32)in[3];
+}
+
+static inline u32 buf_get_le32(const void *_buf)
+{
+ const byte *in = _buf;
+ return ((u32)in[3] << 24) | ((u32)in[2] << 16) | \
+ ((u32)in[1] << 8) | (u32)in[0];
+}
+
+static inline void buf_put_be32(void *_buf, u32 val)
+{
+ byte *out = _buf;
+ out[0] = val >> 24;
+ out[1] = val >> 16;
+ out[2] = val >> 8;
+ out[3] = val;
+}
+
+static inline void buf_put_le32(void *_buf, u32 val)
+{
+ byte *out = _buf;
+ out[3] = val >> 24;
+ out[2] = val >> 16;
+ out[1] = val >> 8;
+ out[0] = val;
+}
+
+
+/* Functions for loading and storing unaligned u64 values of different
+ endianness. */
+static inline u64 buf_get_be64(const void *_buf)
+{
+ const byte *in = _buf;
+ return ((u64)in[0] << 56) | ((u64)in[1] << 48) | \
+ ((u64)in[2] << 40) | ((u64)in[3] << 32) | \
+ ((u64)in[4] << 24) | ((u64)in[5] << 16) | \
+ ((u64)in[6] << 8) | (u64)in[7];
+}
+
+static inline u64 buf_get_le64(const void *_buf)
+{
+ const byte *in = _buf;
+ return ((u64)in[7] << 56) | ((u64)in[6] << 48) | \
+ ((u64)in[5] << 40) | ((u64)in[4] << 32) | \
+ ((u64)in[3] << 24) | ((u64)in[2] << 16) | \
+ ((u64)in[1] << 8) | (u64)in[0];
+}
+
+static inline void buf_put_be64(void *_buf, u64 val)
+{
+ byte *out = _buf;
+ out[0] = val >> 56;
+ out[1] = val >> 48;
+ out[2] = val >> 40;
+ out[3] = val >> 32;
+ out[4] = val >> 24;
+ out[5] = val >> 16;
+ out[6] = val >> 8;
+ out[7] = val;
+}
+
+static inline void buf_put_le64(void *_buf, u64 val)
+{
+ byte *out = _buf;
+ out[7] = val >> 56;
+ out[6] = val >> 48;
+ out[5] = val >> 40;
+ out[4] = val >> 32;
+ out[3] = val >> 24;
+ out[2] = val >> 16;
+ out[1] = val >> 8;
+ out[0] = val;
+}
+
+#else /*BUFHELP_UNALIGNED_ACCESS*/
+
+typedef struct bufhelp_u32_s
+{
+ u32 a;
+} __attribute__((packed, aligned(1), may_alias)) bufhelp_u32_t;
+
+/* Functions for loading and storing unaligned u32 values of different
+ endianness. */
+static inline u32 buf_get_be32(const void *_buf)
+{
+ return be_bswap32(((const bufhelp_u32_t *)_buf)->a);
+}
+
+static inline u32 buf_get_le32(const void *_buf)
+{
+ return le_bswap32(((const bufhelp_u32_t *)_buf)->a);
+}
+
+static inline void buf_put_be32(void *_buf, u32 val)
+{
+ bufhelp_u32_t *out = _buf;
+ out->a = be_bswap32(val);
+}
+
+static inline void buf_put_le32(void *_buf, u32 val)
+{
+ bufhelp_u32_t *out = _buf;
+ out->a = le_bswap32(val);
+}
+
+
+typedef struct bufhelp_u64_s
+{
+ u64 a;
+} __attribute__((packed, aligned(1), may_alias)) bufhelp_u64_t;
+
+/* Functions for loading and storing unaligned u64 values of different
+ endianness. */
+static inline u64 buf_get_be64(const void *_buf)
+{
+ return be_bswap64(((const bufhelp_u64_t *)_buf)->a);
+}
+
+static inline u64 buf_get_le64(const void *_buf)
+{
+ return le_bswap64(((const bufhelp_u64_t *)_buf)->a);
+}
+
+static inline void buf_put_be64(void *_buf, u64 val)
+{
+ bufhelp_u64_t *out = _buf;
+ out->a = be_bswap64(val);
+}
+
+static inline void buf_put_le64(void *_buf, u64 val)
+{
+ bufhelp_u64_t *out = _buf;
+ out->a = le_bswap64(val);
+}
+
+#endif /*BUFHELP_UNALIGNED_ACCESS*/
+
+
+/* Host-endian get/put macros */
+#ifdef WORDS_BIGENDIAN
+# define buf_get_he32 buf_get_be32
+# define buf_put_he32 buf_put_be32
+# define buf_get_he64 buf_get_be64
+# define buf_put_he64 buf_put_be64
+#else
+# define buf_get_he32 buf_get_le32
+# define buf_put_he32 buf_put_le32
+# define buf_get_he64 buf_get_le64
+# define buf_put_he64 buf_put_le64
+#endif
+
+
+
+/* Optimized function for small buffer copying */
+static inline void
+buf_cpy(void *_dst, const void *_src, size_t len)
+{
+ byte *dst = _dst;
+ const byte *src = _src;
+
+#if __GNUC__ >= 4
+ if (!__builtin_constant_p (len))
+ {
+ if (UNLIKELY(len == 0))
+ return;
+ memcpy(_dst, _src, len);
+ return;
+ }
+#endif
+
+ while (len >= sizeof(u64))
+ {
+ buf_put_he64(dst, buf_get_he64(src));
+ dst += sizeof(u64);
+ src += sizeof(u64);
+ len -= sizeof(u64);
+ }
+
+ if (len >= sizeof(u32))
+ {
+ buf_put_he32(dst, buf_get_he32(src));
+ dst += sizeof(u32);
+ src += sizeof(u32);
+ len -= sizeof(u32);
+ }
+
+ /* Handle tail. */
+ for (; len; len--)
+ *dst++ = *src++;
+}
+
+
+/* Optimized function for buffer xoring */
+static inline void
+buf_xor(void *_dst, const void *_src1, const void *_src2, size_t len)
+{
+ byte *dst = _dst;
+ const byte *src1 = _src1;
+ const byte *src2 = _src2;
+
+ while (len >= sizeof(u64))
+ {
+ buf_put_he64(dst, buf_get_he64(src1) ^ buf_get_he64(src2));
+ dst += sizeof(u64);
+ src1 += sizeof(u64);
+ src2 += sizeof(u64);
+ len -= sizeof(u64);
+ }
+
+ if (len > sizeof(u32))
+ {
+ buf_put_he32(dst, buf_get_he32(src1) ^ buf_get_he32(src2));
+ dst += sizeof(u32);
+ src1 += sizeof(u32);
+ src2 += sizeof(u32);
+ len -= sizeof(u32);
+ }
+
+ /* Handle tail. */
+ for (; len; len--)
+ *dst++ = *src1++ ^ *src2++;
+}
+
+
+/* Optimized function for buffer xoring with two destination buffers. Used
+ mainly by CFB mode encryption. */
+static inline void
+buf_xor_2dst(void *_dst1, void *_dst2, const void *_src, size_t len)
+{
+ byte *dst1 = _dst1;
+ byte *dst2 = _dst2;
+ const byte *src = _src;
+
+ while (len >= sizeof(u64))
+ {
+ u64 temp = buf_get_he64(dst2) ^ buf_get_he64(src);
+ buf_put_he64(dst2, temp);
+ buf_put_he64(dst1, temp);
+ dst2 += sizeof(u64);
+ dst1 += sizeof(u64);
+ src += sizeof(u64);
+ len -= sizeof(u64);
+ }
+
+ if (len >= sizeof(u32))
+ {
+ u32 temp = buf_get_he32(dst2) ^ buf_get_he32(src);
+ buf_put_he32(dst2, temp);
+ buf_put_he32(dst1, temp);
+ dst2 += sizeof(u32);
+ dst1 += sizeof(u32);
+ src += sizeof(u32);
+ len -= sizeof(u32);
+ }
+
+ /* Handle tail. */
+ for (; len; len--)
+ *dst1++ = (*dst2++ ^= *src++);
+}
+
+
+/* Optimized function for combined buffer xoring and copying. Used by mainly
+ CBC mode decryption. */
+static inline void
+buf_xor_n_copy_2(void *_dst_xor, const void *_src_xor, void *_srcdst_cpy,
+ const void *_src_cpy, size_t len)
+{
+ byte *dst_xor = _dst_xor;
+ byte *srcdst_cpy = _srcdst_cpy;
+ const byte *src_xor = _src_xor;
+ const byte *src_cpy = _src_cpy;
+
+ while (len >= sizeof(u64))
+ {
+ u64 temp = buf_get_he64(src_cpy);
+ buf_put_he64(dst_xor, buf_get_he64(srcdst_cpy) ^ buf_get_he64(src_xor));
+ buf_put_he64(srcdst_cpy, temp);
+ dst_xor += sizeof(u64);
+ srcdst_cpy += sizeof(u64);
+ src_xor += sizeof(u64);
+ src_cpy += sizeof(u64);
+ len -= sizeof(u64);
+ }
+
+ if (len >= sizeof(u32))
+ {
+ u32 temp = buf_get_he32(src_cpy);
+ buf_put_he32(dst_xor, buf_get_he32(srcdst_cpy) ^ buf_get_he32(src_xor));
+ buf_put_he32(srcdst_cpy, temp);
+ dst_xor += sizeof(u32);
+ srcdst_cpy += sizeof(u32);
+ src_xor += sizeof(u32);
+ src_cpy += sizeof(u32);
+ len -= sizeof(u32);
+ }
+
+ /* Handle tail. */
+ for (; len; len--)
+ {
+ byte temp = *src_cpy++;
+ *dst_xor++ = *srcdst_cpy ^ *src_xor++;
+ *srcdst_cpy++ = temp;
+ }
+}
+
+
+/* Optimized function for combined buffer xoring and copying. Used by mainly
+ CFB mode decryption. */
+static inline void
+buf_xor_n_copy(void *_dst_xor, void *_srcdst_cpy, const void *_src, size_t len)
+{
+ buf_xor_n_copy_2(_dst_xor, _src, _srcdst_cpy, _src, len);
+}
+
+
+/* Constant-time compare of two buffers. Returns 1 if buffers are equal,
+ and 0 if buffers differ. */
+static inline int
+buf_eq_const(const void *_a, const void *_b, size_t len)
+{
+ const byte *a = _a;
+ const byte *b = _b;
+ int ab, ba;
+ size_t i;
+
+ /* Constant-time compare. */
+ for (i = 0, ab = 0, ba = 0; i < len; i++)
+ {
+ /* If a[i] != b[i], either ab or ba will be negative. */
+ ab |= a[i] - b[i];
+ ba |= b[i] - a[i];
+ }
+
+ /* 'ab | ba' is negative when buffers are not equal. */
+ return (ab | ba) >= 0;
+}
+
+
+#endif /*GCRYPT_BUFHELP_H*/
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