bcrypt: Add a builtin sha256 implementation.

Signed-off-by: Michael Müller <michael@fds-team.de>
Signed-off-by: Sebastian Lackner <sebastian@fds-team.de>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>

dlls/bcrypt/Makefile.in

@@ -4,6 +4,7 @@ IMPORTLIB = bcrypt
 EXTRAINCL = $(GNUTLS_CFLAGS)
 
 C_SRCS = \
-	bcrypt_main.c
+	bcrypt_main.c \
+	sha256.c
 
 RC_SRCS = version.rc

dlls/bcrypt/bcrypt_internal.h

@@ -25,6 +25,17 @@
 #include "windef.h"
 #include "winbase.h"
 
+typedef struct
+{
+    ULONG64 len;
+    DWORD h[8];
+    UCHAR buf[64];
+} SHA256_CTX;
+
+void sha256_init(SHA256_CTX *ctx) DECLSPEC_HIDDEN;
+void sha256_update(SHA256_CTX *ctx, const UCHAR *buffer, ULONG len) DECLSPEC_HIDDEN;
+void sha256_finalize(SHA256_CTX *ctx, UCHAR *buffer) DECLSPEC_HIDDEN;
+
 /* Definitions from advapi32 */
 typedef struct
 {

dlls/bcrypt/bcrypt_main.c

@@ -448,6 +448,7 @@ struct hash_impl
     {
         MD5_CTX md5;
         SHA_CTX sha1;
+        SHA256_CTX sha256;
     } u;
 };
 
@@ -463,6 +464,10 @@ static NTSTATUS hash_init( struct hash_impl *hash, enum alg_id alg_id )
         A_SHAInit( &hash->u.sha1 );
         break;
 
+    case ALG_ID_SHA256:
+        sha256_init( &hash->u.sha256 );
+        break;
+
     default:
         ERR( "unhandled id %u\n", alg_id );
         return STATUS_NOT_IMPLEMENTED;
@@ -483,6 +488,10 @@ static NTSTATUS hash_update( struct hash_impl *hash, enum alg_id alg_id,
         A_SHAUpdate( &hash->u.sha1, input, size );
         break;
 
+    case ALG_ID_SHA256:
+        sha256_update( &hash->u.sha256, input, size );
+        break;
+
     default:
         ERR( "unhandled id %u\n", alg_id );
         return STATUS_NOT_IMPLEMENTED;
@@ -504,6 +513,10 @@ static NTSTATUS hash_finish( struct hash_impl *hash, enum alg_id alg_id,
         A_SHAFinal( &hash->u.sha1, (ULONG *)output );
         break;
 
+    case ALG_ID_SHA256:
+        sha256_finalize( &hash->u.sha256, output );
+        break;
+
     default:
         ERR( "unhandled id %u\n", alg_id );
         return STATUS_NOT_IMPLEMENTED;

dlls/bcrypt/sha256.c

@@ -0,0 +1,169 @@
+/*
+ * Copyright 2016 Michael Müller
+ *
+ * This library 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 library 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 library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ *
+ */
+
+/* Based on public domain implementation from
+   https://git.musl-libc.org/cgit/musl/tree/src/crypt/crypt_sha256.c */
+
+#include "bcrypt_internal.h"
+
+static DWORD ror(DWORD n, int k) { return (n >> k) | (n << (32-k)); }
+#define Ch(x,y,z)  (z ^ (x & (y ^ z)))
+#define Maj(x,y,z) ((x & y) | (z & (x | y)))
+#define S0(x)      (ror(x,2) ^ ror(x,13) ^ ror(x,22))
+#define S1(x)      (ror(x,6) ^ ror(x,11) ^ ror(x,25))
+#define R0(x)      (ror(x,7) ^ ror(x,18) ^ (x>>3))
+#define R1(x)      (ror(x,17) ^ ror(x,19) ^ (x>>10))
+
+static const DWORD K[64] =
+{
+  0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
+  0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
+  0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
+  0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
+  0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
+  0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
+  0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
+  0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
+};
+
+static void processblock(SHA256_CTX *ctx, const UCHAR *buffer)
+{
+    DWORD W[64], t1, t2, a, b, c, d, e, f, g, h;
+    int i;
+
+    for (i = 0; i < 16; i++)
+    {
+        W[i]  = (DWORD)buffer[4*i]<<24;
+        W[i] |= (DWORD)buffer[4*i+1]<<16;
+        W[i] |= (DWORD)buffer[4*i+2]<<8;
+        W[i] |= buffer[4*i+3];
+    }
+
+    for (; i < 64; i++)
+        W[i] = R1(W[i-2]) + W[i-7] + R0(W[i-15]) + W[i-16];
+
+    a = ctx->h[0];
+    b = ctx->h[1];
+    c = ctx->h[2];
+    d = ctx->h[3];
+    e = ctx->h[4];
+    f = ctx->h[5];
+    g = ctx->h[6];
+    h = ctx->h[7];
+
+    for (i = 0; i < 64; i++)
+    {
+        t1 = h + S1(e) + Ch(e,f,g) + K[i] + W[i];
+        t2 = S0(a) + Maj(a,b,c);
+        h = g;
+        g = f;
+        f = e;
+        e = d + t1;
+        d = c;
+        c = b;
+        b = a;
+        a = t1 + t2;
+    }
+
+    ctx->h[0] += a;
+    ctx->h[1] += b;
+    ctx->h[2] += c;
+    ctx->h[3] += d;
+    ctx->h[4] += e;
+    ctx->h[5] += f;
+    ctx->h[6] += g;
+    ctx->h[7] += h;
+}
+
+static void pad(SHA256_CTX *ctx)
+{
+    ULONG64 r = ctx->len % 64;
+
+    ctx->buf[r++] = 0x80;
+
+    if (r > 56)
+    {
+        memset(ctx->buf + r, 0, 64 - r);
+        r = 0;
+        processblock(ctx, ctx->buf);
+    }
+
+    memset(ctx->buf + r, 0, 56 - r);
+    ctx->len *= 8;
+    ctx->buf[56] = ctx->len >> 56;
+    ctx->buf[57] = ctx->len >> 48;
+    ctx->buf[58] = ctx->len >> 40;
+    ctx->buf[59] = ctx->len >> 32;
+    ctx->buf[60] = ctx->len >> 24;
+    ctx->buf[61] = ctx->len >> 16;
+    ctx->buf[62] = ctx->len >> 8;
+    ctx->buf[63] = ctx->len;
+
+    processblock(ctx, ctx->buf);
+}
+
+void sha256_init(SHA256_CTX *ctx)
+{
+    ctx->len = 0;
+    ctx->h[0] = 0x6a09e667;
+    ctx->h[1] = 0xbb67ae85;
+    ctx->h[2] = 0x3c6ef372;
+    ctx->h[3] = 0xa54ff53a;
+    ctx->h[4] = 0x510e527f;
+    ctx->h[5] = 0x9b05688c;
+    ctx->h[6] = 0x1f83d9ab;
+    ctx->h[7] = 0x5be0cd19;
+}
+
+void sha256_update(SHA256_CTX *ctx, const UCHAR *buffer, ULONG len)
+{
+    const UCHAR *p = buffer;
+    ULONG64 r = ctx->len % 64;
+
+    ctx->len += len;
+    if (r)
+    {
+        if (len < 64 - r)
+        {
+            memcpy(ctx->buf + r, p, len);
+            return;
+        }
+        memcpy(ctx->buf + r, p, 64 - r);
+        len -= 64 - r;
+        p += 64 - r;
+        processblock(ctx, ctx->buf);
+    }
+    for (; len >= 64; len -= 64, p += 64)
+        processblock(ctx, p);
+    memcpy(ctx->buf, p, len);
+}
+
+void sha256_finalize(SHA256_CTX *ctx, UCHAR *buffer)
+{
+    int i;
+
+    pad(ctx);
+    for (i = 0; i < 8; i++)
+    {
+        buffer[4*i]   = ctx->h[i] >> 24;
+        buffer[4*i+1] = ctx->h[i] >> 16;
+        buffer[4*i+2] = ctx->h[i] >> 8;
+        buffer[4*i+3] = ctx->h[i];
+    }
+}