1 files changed, 415 insertions, 0 deletions
diff --git a/lib/sm3.c b/lib/sm3.c
new file mode 100644
index 0000000..dc12802
--- /dev/null
+++ b/lib/sm3.c
@@ -0,0 +1,415 @@
+/* sm3.c - Functions to compute SM3 message digest of files or memory blocks
+   according to the specification GM/T 004-2012 Cryptographic Hash Algorithm
+   SM3, published by State Encryption Management Bureau, China.
+
+   SM3 cryptographic hash algorithm.
+   <http://www.sca.gov.cn/sca/xwdt/2010-12/17/content_1002389.shtml>
+
+   Copyright (C) 2017-2023 Free Software Foundation, Inc.
+
+   This file 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.
+
+   This file 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 <https://www.gnu.org/licenses/>.  */
+
+/* Written by Jia Zhang <qianyue.zj@alibaba-inc.com>, 2017,
+   considerably copypasting from David Madore's sha256.c */
+
+#include <config.h>
+
+/* Specification.  */
+#if HAVE_OPENSSL_SM3
+# define GL_OPENSSL_INLINE _GL_EXTERN_INLINE
+#endif
+#include "sm3.h"
+
+#include <stdint.h>
+#include <string.h>
+
+#include <byteswap.h>
+#ifdef WORDS_BIGENDIAN
+# define SWAP(n) (n)
+#else
+# define SWAP(n) bswap_32 (n)
+#endif
+
+#ifndef DEBUG_SM3
+# define DEBUG_SM3 0
+#endif
+
+#if ! DEBUG_SM3
+# define dbg_printf(fmt, ...) do { } while (0)
+#else
+# define dbg_printf printf
+#endif
+
+#if ! HAVE_OPENSSL_SM3
+
+/* This array contains the bytes used to pad the buffer to the next
+   64-byte boundary.  */
+static const unsigned char fillbuf[64] = { 0x80, 0 /* , 0, 0, ...  */ };
+
+
+/*
+  Takes a pointer to a 256 bit block of data (eight 32 bit ints) and
+  initializes it to the start constants of the SM3 algorithm.  This
+  must be called before using hash in the call to sm3_hash
+*/
+void
+sm3_init_ctx (struct sm3_ctx *ctx)
+{
+  ctx->state[0] = 0x7380166fUL;
+  ctx->state[1] = 0x4914b2b9UL;
+  ctx->state[2] = 0x172442d7UL;
+  ctx->state[3] = 0xda8a0600UL;
+  ctx->state[4] = 0xa96f30bcUL;
+  ctx->state[5] = 0x163138aaUL;
+  ctx->state[6] = 0xe38dee4dUL;
+  ctx->state[7] = 0xb0fb0e4eUL;
+
+  ctx->total[0] = ctx->total[1] = 0;
+  ctx->buflen = 0;
+}
+
+/* Copy the value from v into the memory location pointed to by *cp,
+   If your architecture allows unaligned access this is equivalent to
+   * (uint32_t *) cp = v  */
+static void
+set_uint32 (char *cp, uint32_t v)
+{
+  memcpy (cp, &v, sizeof v);
+}
+
+/* Put result from CTX in first 32 bytes following RESBUF.  The result
+   must be in little endian byte order.  */
+void *
+sm3_read_ctx (const struct sm3_ctx *ctx, void *resbuf)
+{
+  int i;
+  char *r = resbuf;
+
+  for (i = 0; i < 8; i++)
+    set_uint32 (r + i * sizeof ctx->state[0], SWAP (ctx->state[i]));
+
+  return resbuf;
+}
+
+/* Process the remaining bytes in the internal buffer and the usual
+   prolog according to the standard and write the result to RESBUF.  */
+static void
+sm3_conclude_ctx (struct sm3_ctx *ctx)
+{
+  /* Take yet unprocessed bytes into account.  */
+  size_t bytes = ctx->buflen;
+  size_t size = (bytes < 56) ? 64 / 4 : 64 * 2 / 4;
+
+  /* Now count remaining bytes.  */
+  ctx->total[0] += bytes;
+  if (ctx->total[0] < bytes)
+    ++ctx->total[1];
+
+  /* Put the 64-bit file length in *bits* at the end of the buffer.
+     Use set_uint32 rather than a simple assignment, to avoid risk of
+     unaligned access.  */
+  set_uint32 ((char *) &ctx->buffer[size - 2],
+              SWAP ((ctx->total[1] << 3) | (ctx->total[0] >> 29)));
+  set_uint32 ((char *) &ctx->buffer[size - 1],
+              SWAP (ctx->total[0] << 3));
+
+  memcpy (&((char *) ctx->buffer)[bytes], fillbuf, (size - 2) * 4 - bytes);
+
+  /* Process last bytes.  */
+  sm3_process_block (ctx->buffer, size * 4, ctx);
+}
+
+void *
+sm3_finish_ctx (struct sm3_ctx *ctx, void *resbuf)
+{
+  sm3_conclude_ctx (ctx);
+  return sm3_read_ctx (ctx, resbuf);
+}
+
+/* Compute SM3 message digest for LEN bytes beginning at BUFFER.  The
+   result is always in little endian byte order, so that a byte-wise
+   output yields to the wanted ASCII representation of the message
+   digest.  */
+void *
+sm3_buffer (const char *buffer, size_t len, void *resblock)
+{
+  struct sm3_ctx ctx;
+
+  /* Initialize the computation context.  */
+  sm3_init_ctx (&ctx);
+
+  /* Process whole buffer but last len % 64 bytes.  */
+  sm3_process_bytes (buffer, len, &ctx);
+
+  /* Put result in desired memory area.  */
+  return sm3_finish_ctx (&ctx, resblock);
+}
+
+void
+sm3_process_bytes (const void *buffer, size_t len, struct sm3_ctx *ctx)
+{
+  /* When we already have some bits in our internal buffer concatenate
+     both inputs first.  */
+  if (ctx->buflen != 0)
+    {
+      size_t left_over = ctx->buflen;
+      size_t add = 128 - left_over > len ? len : 128 - left_over;
+
+      memcpy (&((char *) ctx->buffer)[left_over], buffer, add);
+      ctx->buflen += add;
+
+      if (ctx->buflen > 64)
+        {
+          sm3_process_block (ctx->buffer, ctx->buflen & ~63, ctx);
+
+          ctx->buflen &= 63;
+          /* The regions in the following copy operation cannot overlap,
+             because ctx->buflen < 64 ≤ (left_over + add) & ~63.  */
+          memcpy (ctx->buffer,
+                  &((char *) ctx->buffer)[(left_over + add) & ~63],
+                  ctx->buflen);
+        }
+
+      buffer = (const char *) buffer + add;
+      len -= add;
+    }
+
+  /* Process available complete blocks.  */
+  if (len >= 64)
+    {
+#if !(_STRING_ARCH_unaligned || _STRING_INLINE_unaligned)
+# define UNALIGNED_P(p) ((uintptr_t) (p) % alignof (uint32_t) != 0)
+      if (UNALIGNED_P (buffer))
+        while (len > 64)
+          {
+            sm3_process_block (memcpy (ctx->buffer, buffer, 64), 64, ctx);
+            buffer = (const char *) buffer + 64;
+            len -= 64;
+          }
+      else
+#endif
+        {
+          sm3_process_block (buffer, len & ~63, ctx);
+          buffer = (const char *) buffer + (len & ~63);
+          len &= 63;
+        }
+    }
+
+  /* Move remaining bytes in internal buffer.  */
+  if (len > 0)
+    {
+      size_t left_over = ctx->buflen;
+
+      memcpy (&((char *) ctx->buffer)[left_over], buffer, len);
+      left_over += len;
+      if (left_over >= 64)
+        {
+          sm3_process_block (ctx->buffer, 64, ctx);
+          left_over -= 64;
+          /* The regions in the following copy operation cannot overlap,
+             because left_over ≤ 64.  */
+          memcpy (ctx->buffer, &ctx->buffer[16], left_over);
+        }
+      ctx->buflen = left_over;
+    }
+}
+
+/* --- Code below is the primary difference between sha256.c and sm3.c --- */
+
+/* SM3 round constants */
+#define T(j) sm3_round_constants[j]
+static const uint32_t sm3_round_constants[64] = {
+  0x79cc4519UL, 0xf3988a32UL, 0xe7311465UL, 0xce6228cbUL,
+  0x9cc45197UL, 0x3988a32fUL, 0x7311465eUL, 0xe6228cbcUL,
+  0xcc451979UL, 0x988a32f3UL, 0x311465e7UL, 0x6228cbceUL,
+  0xc451979cUL, 0x88a32f39UL, 0x11465e73UL, 0x228cbce6UL,
+  0x9d8a7a87UL, 0x3b14f50fUL, 0x7629ea1eUL, 0xec53d43cUL,
+  0xd8a7a879UL, 0xb14f50f3UL, 0x629ea1e7UL, 0xc53d43ceUL,
+  0x8a7a879dUL, 0x14f50f3bUL, 0x29ea1e76UL, 0x53d43cecUL,
+  0xa7a879d8UL, 0x4f50f3b1UL, 0x9ea1e762UL, 0x3d43cec5UL,
+  0x7a879d8aUL, 0xf50f3b14UL, 0xea1e7629UL, 0xd43cec53UL,
+  0xa879d8a7UL, 0x50f3b14fUL, 0xa1e7629eUL, 0x43cec53dUL,
+  0x879d8a7aUL, 0x0f3b14f5UL, 0x1e7629eaUL, 0x3cec53d4UL,
+  0x79d8a7a8UL, 0xf3b14f50UL, 0xe7629ea1UL, 0xcec53d43UL,
+  0x9d8a7a87UL, 0x3b14f50fUL, 0x7629ea1eUL, 0xec53d43cUL,
+  0xd8a7a879UL, 0xb14f50f3UL, 0x629ea1e7UL, 0xc53d43ceUL,
+  0x8a7a879dUL, 0x14f50f3bUL, 0x29ea1e76UL, 0x53d43cecUL,
+  0xa7a879d8UL, 0x4f50f3b1UL, 0x9ea1e762UL, 0x3d43cec5UL,
+};
+
+/* Round functions.  */
+#define FF1(X,Y,Z) ( X ^ Y ^ Z )
+#define FF2(X,Y,Z) ( ( X & Y ) | ( X & Z ) | ( Y & Z ) )
+#define GG1(X,Y,Z) ( X ^ Y ^ Z )
+#define GG2(X,Y,Z) ( ( X & Y ) | ( ~X & Z ) )
+
+/* Process LEN bytes of BUFFER, accumulating context into CTX.
+   It is assumed that LEN % 64 == 0.
+   Most of this code comes from David Madore's sha256.c.  */
+
+void
+sm3_process_block (const void *buffer, size_t len, struct sm3_ctx *ctx)
+{
+  const uint32_t *words = buffer;
+  size_t nwords = len / sizeof (uint32_t);
+  const uint32_t *endp = words + nwords;
+  uint32_t x[16];
+  uint32_t a = ctx->state[0];
+  uint32_t b = ctx->state[1];
+  uint32_t c = ctx->state[2];
+  uint32_t d = ctx->state[3];
+  uint32_t e = ctx->state[4];
+  uint32_t f = ctx->state[5];
+  uint32_t g = ctx->state[6];
+  uint32_t h = ctx->state[7];
+  uint32_t lolen = len;
+
+  /* First increment the byte count.  GM/T 004-2012 specifies the possible
+     length of the file up to 2^64 bits.  Here we only compute the
+     number of bytes.  Do a double word increment.  */
+  ctx->total[0] += lolen;
+  ctx->total[1] += (len >> 31 >> 1) + (ctx->total[0] < lolen);
+
+#define rol(x, n) (((x) << ((n) & 31)) | ((x) >> ((32 - (n)) & 31)))
+#define P0(x) ((x)^rol(x,9)^rol(x,17))
+#define P1(x) ((x)^rol(x,15)^rol(x,23))
+
+#define W1(I) ( x[I&0x0f] )
+#define W2(I) ( tw =   P1(x[I&0x0f]^x[(I-9)&0x0f]^rol(x[(I-3)&0x0f],15)) \
+                     ^ rol(x[(I-13)&0x0f],7) ^ x[(I-6)&0x0f] \
+                , x[I&0x0f] = tw )
+
+#define R(i,A,B,C,D,E,F,G,H,T,W1,W2) \
+  do { \
+       if (++j) \
+         dbg_printf("%2d %08x %08x %08x %08x %08x %08x %08x %08x\n", \
+                    j-1, A, B, C, D, E, F, G, H); \
+       ss1 = rol(rol(A,12) + E + T,7); \
+       ss2 = ss1 ^ rol(A,12); \
+       D += FF##i(A,B,C) + ss2 + (W1 ^ W2); \
+       H += GG##i(E,F,G) + ss1 + W1; \
+       B = rol(B,9); \
+       F = rol(F,19); \
+       H = P0(H); \
+     } while(0)
+
+#define R1(A,B,C,D,E,F,G,H,T,W1,W2) R(1,A,B,C,D,E,F,G,H,T,W1,W2)
+#define R2(A,B,C,D,E,F,G,H,T,W1,W2) R(2,A,B,C,D,E,F,G,H,T,W1,W2)
+
+  while (words < endp)
+    {
+      uint32_t tw;
+      uint32_t ss1, ss2;
+      int j;
+
+      for (j = 0; j < 16; j++)
+        {
+          x[j] = SWAP (*words);
+          words++;
+        }
+
+      j = -1;
+
+      dbg_printf (" j    A        B        C        D        E  "
+                  "      F        G        H\n"
+                  "   %08x %08x %08x %08x %08x %08x %08x %08x\n",
+                  a, b, c, d, e, f, g, h);
+
+      R1( a, b, c, d, e, f, g, h, T( 0), W1( 0), W1( 4) );
+      R1( d, a, b, c, h, e, f, g, T( 1), W1( 1), W1( 5) );
+      R1( c, d, a, b, g, h, e, f, T( 2), W1( 2), W1( 6) );
+      R1( b, c, d, a, f, g, h, e, T( 3), W1( 3), W1( 7) );
+      R1( a, b, c, d, e, f, g, h, T( 4), W1( 4), W1( 8) );
+      R1( d, a, b, c, h, e, f, g, T( 5), W1( 5), W1( 9) );
+      R1( c, d, a, b, g, h, e, f, T( 6), W1( 6), W1(10) );
+      R1( b, c, d, a, f, g, h, e, T( 7), W1( 7), W1(11) );
+      R1( a, b, c, d, e, f, g, h, T( 8), W1( 8), W1(12) );
+      R1( d, a, b, c, h, e, f, g, T( 9), W1( 9), W1(13) );
+      R1( c, d, a, b, g, h, e, f, T(10), W1(10), W1(14) );
+      R1( b, c, d, a, f, g, h, e, T(11), W1(11), W1(15) );
+      R1( a, b, c, d, e, f, g, h, T(12), W1(12), W2(16) );
+      R1( d, a, b, c, h, e, f, g, T(13), W1(13), W2(17) );
+      R1( c, d, a, b, g, h, e, f, T(14), W1(14), W2(18) );
+      R1( b, c, d, a, f, g, h, e, T(15), W1(15), W2(19) );
+      R2( a, b, c, d, e, f, g, h, T(16), W1(16), W2(20) );
+      R2( d, a, b, c, h, e, f, g, T(17), W1(17), W2(21) );
+      R2( c, d, a, b, g, h, e, f, T(18), W1(18), W2(22) );
+      R2( b, c, d, a, f, g, h, e, T(19), W1(19), W2(23) );
+      R2( a, b, c, d, e, f, g, h, T(20), W1(20), W2(24) );
+      R2( d, a, b, c, h, e, f, g, T(21), W1(21), W2(25) );
+      R2( c, d, a, b, g, h, e, f, T(22), W1(22), W2(26) );
+      R2( b, c, d, a, f, g, h, e, T(23), W1(23), W2(27) );
+      R2( a, b, c, d, e, f, g, h, T(24), W1(24), W2(28) );
+      R2( d, a, b, c, h, e, f, g, T(25), W1(25), W2(29) );
+      R2( c, d, a, b, g, h, e, f, T(26), W1(26), W2(30) );
+      R2( b, c, d, a, f, g, h, e, T(27), W1(27), W2(31) );
+      R2( a, b, c, d, e, f, g, h, T(28), W1(28), W2(32) );
+      R2( d, a, b, c, h, e, f, g, T(29), W1(29), W2(33) );
+      R2( c, d, a, b, g, h, e, f, T(30), W1(30), W2(34) );
+      R2( b, c, d, a, f, g, h, e, T(31), W1(31), W2(35) );
+      R2( a, b, c, d, e, f, g, h, T(32), W1(32), W2(36) );
+      R2( d, a, b, c, h, e, f, g, T(33), W1(33), W2(37) );
+      R2( c, d, a, b, g, h, e, f, T(34), W1(34), W2(38) );
+      R2( b, c, d, a, f, g, h, e, T(35), W1(35), W2(39) );
+      R2( a, b, c, d, e, f, g, h, T(36), W1(36), W2(40) );
+      R2( d, a, b, c, h, e, f, g, T(37), W1(37), W2(41) );
+      R2( c, d, a, b, g, h, e, f, T(38), W1(38), W2(42) );
+      R2( b, c, d, a, f, g, h, e, T(39), W1(39), W2(43) );
+      R2( a, b, c, d, e, f, g, h, T(40), W1(40), W2(44) );
+      R2( d, a, b, c, h, e, f, g, T(41), W1(41), W2(45) );
+      R2( c, d, a, b, g, h, e, f, T(42), W1(42), W2(46) );
+      R2( b, c, d, a, f, g, h, e, T(43), W1(43), W2(47) );
+      R2( a, b, c, d, e, f, g, h, T(44), W1(44), W2(48) );
+      R2( d, a, b, c, h, e, f, g, T(45), W1(45), W2(49) );
+      R2( c, d, a, b, g, h, e, f, T(46), W1(46), W2(50) );
+      R2( b, c, d, a, f, g, h, e, T(47), W1(47), W2(51) );
+      R2( a, b, c, d, e, f, g, h, T(48), W1(48), W2(52) );
+      R2( d, a, b, c, h, e, f, g, T(49), W1(49), W2(53) );
+      R2( c, d, a, b, g, h, e, f, T(50), W1(50), W2(54) );
+      R2( b, c, d, a, f, g, h, e, T(51), W1(51), W2(55) );
+      R2( a, b, c, d, e, f, g, h, T(52), W1(52), W2(56) );
+      R2( d, a, b, c, h, e, f, g, T(53), W1(53), W2(57) );
+      R2( c, d, a, b, g, h, e, f, T(54), W1(54), W2(58) );
+      R2( b, c, d, a, f, g, h, e, T(55), W1(55), W2(59) );
+      R2( a, b, c, d, e, f, g, h, T(56), W1(56), W2(60) );
+      R2( d, a, b, c, h, e, f, g, T(57), W1(57), W2(61) );
+      R2( c, d, a, b, g, h, e, f, T(58), W1(58), W2(62) );
+      R2( b, c, d, a, f, g, h, e, T(59), W1(59), W2(63) );
+      R2( a, b, c, d, e, f, g, h, T(60), W1(60), W2(64) );
+      R2( d, a, b, c, h, e, f, g, T(61), W1(61), W2(65) );
+      R2( c, d, a, b, g, h, e, f, T(62), W1(62), W2(66) );
+      R2( b, c, d, a, f, g, h, e, T(63), W1(63), W2(67) );
+
+      dbg_printf("%2d %08x %08x %08x %08x %08x %08x %08x %08x\n",
+                 j, a, b, c, d, e, f, g, h);
+
+      a = ctx->state[0] ^= a;
+      b = ctx->state[1] ^= b;
+      c = ctx->state[2] ^= c;
+      d = ctx->state[3] ^= d;
+      e = ctx->state[4] ^= e;
+      f = ctx->state[5] ^= f;
+      g = ctx->state[6] ^= g;
+      h = ctx->state[7] ^= h;
+    }
+}
+
+#endif
+
+/*
+ * Hey Emacs!
+ * Local Variables:
+ * coding: utf-8
+ * End:
+ */