diff --git a/dtbhtool/mkbootimg.c b/dtbhtool/mkbootimg.c
index bb1528e..7b59139 100644
--- a/dtbhtool/mkbootimg.c
+++ b/dtbhtool/mkbootimg.c
@@ -36,7 +36,7 @@
 
 #include <dtbimg.h>
 
-#include "mincrypt/sha.h"
+#include <openssl/sha.h>
 #include "bootimg.h"
 
 static void *load_file(const char *fn, unsigned *_sz)
@@ -131,7 +131,7 @@
     unsigned pagesize = 2048;
     int fd;
     SHA_CTX ctx;
-    uint8_t* sha;
+    uint8_t sha[SHA_DIGEST_LENGTH];
     unsigned base           = 0x10000000;
     unsigned kernel_offset  = 0x00008000;
     unsigned ramdisk_offset = 0x01000000;
@@ -283,20 +283,20 @@
     /* put a hash of the contents in the header so boot images can be
      * differentiated based on their first 2k.
      */
-    SHA_init(&ctx);
-    SHA_update(&ctx, kernel_data, hdr.kernel_size);
-    SHA_update(&ctx, &hdr.kernel_size, sizeof(hdr.kernel_size));
-    SHA_update(&ctx, ramdisk_data, hdr.ramdisk_size);
-    SHA_update(&ctx, &hdr.ramdisk_size, sizeof(hdr.ramdisk_size));
-    SHA_update(&ctx, second_data, hdr.second_size);
-    SHA_update(&ctx, &hdr.second_size, sizeof(hdr.second_size));
+    SHA1_Init(&ctx);
+    SHA1_Update(&ctx, kernel_data, hdr.kernel_size);
+    SHA1_Update(&ctx, &hdr.kernel_size, sizeof(hdr.kernel_size));
+    SHA1_Update(&ctx, ramdisk_data, hdr.ramdisk_size);
+    SHA1_Update(&ctx, &hdr.ramdisk_size, sizeof(hdr.ramdisk_size));
+    SHA1_Update(&ctx, second_data, hdr.second_size);
+    SHA1_Update(&ctx, &hdr.second_size, sizeof(hdr.second_size));
     if(dt_data) {
-        SHA_update(&ctx, dt_data, hdr.dt_size);
-        SHA_update(&ctx, &hdr.dt_size, sizeof(hdr.dt_size));
+        SHA1_Update(&ctx, dt_data, hdr.dt_size);
+        SHA1_Update(&ctx, &hdr.dt_size, sizeof(hdr.dt_size));
     }
-    sha = SHA_final(&ctx);
+    SHA1_Final(sha, &ctx);
     memcpy(hdr.id, sha,
-           SHA_DIGEST_SIZE > sizeof(hdr.id) ? sizeof(hdr.id) : SHA_DIGEST_SIZE);
+           SHA_DIGEST_LENGTH > sizeof(hdr.id) ? sizeof(hdr.id) : SHA_DIGEST_LENGTH);
 
     fd = open(bootimg, O_CREAT | O_TRUNC | O_WRONLY, 0644);
     if(fd < 0) {