crypto: add support for nettle's native XTS impl

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>

diff --git a/configure b/configure
index d1e9e457ce2da7e17192ea75d4f5d7f30d5df0de..452c2dfe4e550954fd521cf248e0b4905bf20fce 100755 (executable)
--- a/configure
+++ b/configure
@@ -472,6 +472,7 @@ gtk_gl="no"
 tls_priority="NORMAL"
 gnutls=""
 nettle=""
+nettle_xts="no"
 gcrypt=""
 gcrypt_hmac="no"
 gcrypt_xts="no"
@@ -2871,6 +2872,19 @@ 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
@@ -6346,6 +6360,10 @@ then
    echo "  XTS             $gcrypt_xts"
 fi
 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 d7411bb8ff9ecc095c2be81f13c7eb1f6b9f5c19..7e9a4cc19993a1bccdf48c4e9e90aca162880f18 100644 (file)
--- 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,