From c4db6fcb2c45b800cd46e088f8265ccc0631b6fc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= <berrange@redhat.com>
Date: Mon, 14 Oct 2019 17:28:27 +0100
Subject: [PATCH] crypto: add support for nettle's native XTS impl
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Nettle 3.5.0 will add support for the XTS mode. Use this because long
term we wish to delete QEMU's XTS impl to avoid carrying private crypto
algorithm impls.

Unfortunately this degrades nettle performance from 612 MB/s to 568 MB/s
as nettle's XTS impl isn't so well optimized yet.

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 configure              | 18 ++++++++++++++++++
 crypto/cipher-nettle.c | 18 ++++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/configure b/configure
index 577533e9ed..5dcaac3b95 100755
--- a/configure
+++ b/configure
@@ -473,6 +473,7 @@ gtk_gl="no"
 tls_priority="NORMAL"
 gnutls=""
 nettle=""
+nettle_xts="no"
 gcrypt=""
 gcrypt_hmac="no"
 auth_pam=""
@@ -2918,6 +2919,19 @@ if test "$nettle" != "no"; then
             pass="yes"
         fi
     fi
+    if test "$pass" = "yes"
+    then
+        cat > $TMPC << EOF
+#include <nettle/xts.h>
+int main(void) {
+  return 0;
+}
+EOF
+        if compile_prog "$nettle_cflags" "$nettle_libs" ; then
+            nettle_xts=yes
+            qemu_private_xts=no
+        fi
+    fi
     if test "$pass" = "no" && test "$nettle" = "yes"; then
         feature_not_found "nettle" "Install nettle devel >= 2.7.1"
     else
@@ -6391,6 +6405,10 @@ echo "TLS priority      $tls_priority"
 echo "GNUTLS support    $gnutls"
 echo "libgcrypt         $gcrypt"
 echo "nettle            $nettle $(echo_version $nettle $nettle_version)"
+if test "$nettle" = "yes"
+then
+   echo "  XTS             $nettle_xts"
+fi
 echo "libtasn1          $tasn1"
 echo "PAM               $auth_pam"
 echo "iconv support     $iconv"
diff --git a/crypto/cipher-nettle.c b/crypto/cipher-nettle.c
index d7411bb8ff..7e9a4cc199 100644
--- a/crypto/cipher-nettle.c
+++ b/crypto/cipher-nettle.c
@@ -19,7 +19,9 @@
  */
 
 #include "qemu/osdep.h"
+#ifdef CONFIG_QEMU_PRIVATE_XTS
 #include "crypto/xts.h"
+#endif
 #include "cipherpriv.h"
 
 #include <nettle/nettle-types.h>
@@ -30,6 +32,9 @@
 #include <nettle/serpent.h>
 #include <nettle/twofish.h>
 #include <nettle/ctr.h>
+#ifndef CONFIG_QEMU_PRIVATE_XTS
+#include <nettle/xts.h>
+#endif
 
 typedef void (*QCryptoCipherNettleFuncWrapper)(const void *ctx,
                                                size_t length,
@@ -626,9 +631,15 @@ qcrypto_nettle_cipher_encrypt(QCryptoCipher *cipher,
         break;
 
     case QCRYPTO_CIPHER_MODE_XTS:
+#ifdef CONFIG_QEMU_PRIVATE_XTS
         xts_encrypt(ctx->ctx, ctx->ctx_tweak,
                     ctx->alg_encrypt_wrapper, ctx->alg_encrypt_wrapper,
                     ctx->iv, len, out, in);
+#else
+        xts_encrypt_message(ctx->ctx, ctx->ctx_tweak,
+                            ctx->alg_encrypt_native,
+                            ctx->iv, len, out, in);
+#endif
         break;
 
     case QCRYPTO_CIPHER_MODE_CTR:
@@ -673,9 +684,16 @@ qcrypto_nettle_cipher_decrypt(QCryptoCipher *cipher,
         break;
 
     case QCRYPTO_CIPHER_MODE_XTS:
+#ifdef CONFIG_QEMU_PRIVATE_XTS
         xts_decrypt(ctx->ctx, ctx->ctx_tweak,
                     ctx->alg_encrypt_wrapper, ctx->alg_decrypt_wrapper,
                     ctx->iv, len, out, in);
+#else
+        xts_decrypt_message(ctx->ctx, ctx->ctx_tweak,
+                            ctx->alg_decrypt_native,
+                            ctx->alg_encrypt_native,
+                            ctx->iv, len, out, in);
+#endif
         break;
     case QCRYPTO_CIPHER_MODE_CTR:
         ctr_crypt(ctx->ctx, ctx->alg_encrypt_native,
-- 
2.27.0