1 files changed, 93 insertions, 8 deletions

diff --git a/libavutil/xtea.c b/libavutil/xtea.c
index d1efebf590..5bb4cf7bf5 100644
--- a/libavutil/xtea.c
+++ b/libavutil/xtea.c
@@ -4,20 +4,20 @@
  *
  * loosely based on the implementation of David Wheeler and Roger Needham
  *
- * This file is part of Libav.
+ * This file is part of FFmpeg.
  *
- * Libav is free software; you can redistribute it and/or
+ * FFmpeg 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.
  *
- * Libav is distributed in the hope that it will be useful,
+ * FFmpeg 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 Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
@@ -38,32 +38,116 @@ static void xtea_crypt_ecb(AVXTEA *ctx, uint8_t *dst, const uint8_t *src,
                            int decrypt, uint8_t *iv)
 {
     uint32_t v0, v1;
-    int i;
+#if !CONFIG_SMALL
+    uint32_t k0 = ctx->key[0];
+    uint32_t k1 = ctx->key[1];
+    uint32_t k2 = ctx->key[2];
+    uint32_t k3 = ctx->key[3];
+#endif
 
     v0 = AV_RB32(src);
     v1 = AV_RB32(src + 4);
 
     if (decrypt) {
-        uint32_t delta = 0x9E3779B9, sum = delta * 32;
+#if CONFIG_SMALL
+        int i;
+        uint32_t delta = 0x9E3779B9U, sum = delta * 32;
 
         for (i = 0; i < 32; i++) {
             v1 -= (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + ctx->key[(sum >> 11) & 3]);
             sum -= delta;
             v0 -= (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + ctx->key[sum & 3]);
         }
+#else
+#define DSTEP(SUM, K0, K1) \
+            v1 -= (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (SUM + K0); \
+            v0 -= (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (SUM - 0x9E3779B9U + K1)
+
+        DSTEP(0xC6EF3720U, k2, k3);
+        DSTEP(0x28B7BD67U, k3, k2);
+        DSTEP(0x8A8043AEU, k0, k1);
+        DSTEP(0xEC48C9F5U, k1, k0);
+        DSTEP(0x4E11503CU, k2, k3);
+        DSTEP(0xAFD9D683U, k2, k2);
+        DSTEP(0x11A25CCAU, k3, k1);
+        DSTEP(0x736AE311U, k0, k0);
+        DSTEP(0xD5336958U, k1, k3);
+        DSTEP(0x36FBEF9FU, k1, k2);
+        DSTEP(0x98C475E6U, k2, k1);
+        DSTEP(0xFA8CFC2DU, k3, k0);
+        DSTEP(0x5C558274U, k0, k3);
+        DSTEP(0xBE1E08BBU, k1, k2);
+        DSTEP(0x1FE68F02U, k1, k1);
+        DSTEP(0x81AF1549U, k2, k0);
+        DSTEP(0xE3779B90U, k3, k3);
+        DSTEP(0x454021D7U, k0, k2);
+        DSTEP(0xA708A81EU, k1, k1);
+        DSTEP(0x08D12E65U, k1, k0);
+        DSTEP(0x6A99B4ACU, k2, k3);
+        DSTEP(0xCC623AF3U, k3, k2);
+        DSTEP(0x2E2AC13AU, k0, k1);
+        DSTEP(0x8FF34781U, k0, k0);
+        DSTEP(0xF1BBCDC8U, k1, k3);
+        DSTEP(0x5384540FU, k2, k2);
+        DSTEP(0xB54CDA56U, k3, k1);
+        DSTEP(0x1715609DU, k0, k0);
+        DSTEP(0x78DDE6E4U, k0, k3);
+        DSTEP(0xDAA66D2BU, k1, k2);
+        DSTEP(0x3C6EF372U, k2, k1);
+        DSTEP(0x9E3779B9U, k3, k0);
+#endif
         if (iv) {
             v0 ^= AV_RB32(iv);
             v1 ^= AV_RB32(iv + 4);
             memcpy(iv, src, 8);
         }
     } else {
-        uint32_t sum = 0, delta = 0x9E3779B9;
+#if CONFIG_SMALL
+        int i;
+        uint32_t sum = 0, delta = 0x9E3779B9U;
 
         for (i = 0; i < 32; i++) {
             v0 += (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + ctx->key[sum & 3]);
             sum += delta;
             v1 += (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + ctx->key[(sum >> 11) & 3]);
         }
+#else
+#define ESTEP(SUM, K0, K1) \
+            v0 += (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (SUM + K0);\
+            v1 += (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (SUM + 0x9E3779B9U + K1)
+        ESTEP(0x00000000U, k0, k3);
+        ESTEP(0x9E3779B9U, k1, k2);
+        ESTEP(0x3C6EF372U, k2, k1);
+        ESTEP(0xDAA66D2BU, k3, k0);
+        ESTEP(0x78DDE6E4U, k0, k0);
+        ESTEP(0x1715609DU, k1, k3);
+        ESTEP(0xB54CDA56U, k2, k2);
+        ESTEP(0x5384540FU, k3, k1);
+        ESTEP(0xF1BBCDC8U, k0, k0);
+        ESTEP(0x8FF34781U, k1, k0);
+        ESTEP(0x2E2AC13AU, k2, k3);
+        ESTEP(0xCC623AF3U, k3, k2);
+        ESTEP(0x6A99B4ACU, k0, k1);
+        ESTEP(0x08D12E65U, k1, k1);
+        ESTEP(0xA708A81EU, k2, k0);
+        ESTEP(0x454021D7U, k3, k3);
+        ESTEP(0xE3779B90U, k0, k2);
+        ESTEP(0x81AF1549U, k1, k1);
+        ESTEP(0x1FE68F02U, k2, k1);
+        ESTEP(0xBE1E08BBU, k3, k0);
+        ESTEP(0x5C558274U, k0, k3);
+        ESTEP(0xFA8CFC2DU, k1, k2);
+        ESTEP(0x98C475E6U, k2, k1);
+        ESTEP(0x36FBEF9FU, k3, k1);
+        ESTEP(0xD5336958U, k0, k0);
+        ESTEP(0x736AE311U, k1, k3);
+        ESTEP(0x11A25CCAU, k2, k2);
+        ESTEP(0xAFD9D683U, k3, k2);
+        ESTEP(0x4E11503CU, k0, k1);
+        ESTEP(0xEC48C9F5U, k1, k0);
+        ESTEP(0x8A8043AEU, k2, k3);
+        ESTEP(0x28B7BD67U, k3, k2);
+#endif
     }
 
     AV_WB32(dst, v0);
@@ -159,7 +243,7 @@ int main(void)
     AVXTEA ctx;
     uint8_t buf[8], iv[8];
     int i;
-    const uint8_t src[32] = "HelloWorldHelloWorldHelloWorld";
+    static const uint8_t src[32] = "HelloWorldHelloWorldHelloWorld";
     uint8_t ct[32];
     uint8_t pl[32];
 
@@ -180,6 +264,7 @@ int main(void)
         memcpy(iv, "HALLO123", 8);
         test_xtea(&ctx, ct, ct, src, 4, iv, 1, "CBC inplace decryption");
     }
+
     printf("Test encryption/decryption success.\n");
 
     return 0;