crypto: Rename cipher include files to .c.inc

QEMU standard procedure for included c files is to use *.c.inc.
E.g. there are a different set of checks that are applied.

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>

1 files changed, 734 insertions, 0 deletions

diff --git a/crypto/cipher-nettle.c.inc b/crypto/cipher-nettle.c.inc
new file mode 100644
index 0000000000..0677fdfd33
--- /dev/null
+++ b/crypto/cipher-nettle.c.inc
@@ -0,0 +1,734 @@
+/*
+ * QEMU Crypto cipher nettle algorithms
+ *
+ * Copyright (c) 2015 Red Hat, Inc.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "qemu/osdep.h"
+#ifdef CONFIG_QEMU_PRIVATE_XTS
+#include "crypto/xts.h"
+#endif
+#include "cipherpriv.h"
+
+#include <nettle/nettle-types.h>
+#include <nettle/aes.h>
+#include <nettle/des.h>
+#include <nettle/cbc.h>
+#include <nettle/cast128.h>
+#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,
+                                               uint8_t *dst,
+                                               const uint8_t *src);
+
+#if CONFIG_NETTLE_VERSION_MAJOR < 3
+typedef nettle_crypt_func * QCryptoCipherNettleFuncNative;
+typedef void *       cipher_ctx_t;
+typedef unsigned     cipher_length_t;
+
+#define cast5_set_key cast128_set_key
+
+#define aes128_ctx aes_ctx
+#define aes192_ctx aes_ctx
+#define aes256_ctx aes_ctx
+#define aes128_set_encrypt_key(c, k) \
+    aes_set_encrypt_key(c, 16, k)
+#define aes192_set_encrypt_key(c, k) \
+    aes_set_encrypt_key(c, 24, k)
+#define aes256_set_encrypt_key(c, k) \
+    aes_set_encrypt_key(c, 32, k)
+#define aes128_set_decrypt_key(c, k) \
+    aes_set_decrypt_key(c, 16, k)
+#define aes192_set_decrypt_key(c, k) \
+    aes_set_decrypt_key(c, 24, k)
+#define aes256_set_decrypt_key(c, k) \
+    aes_set_decrypt_key(c, 32, k)
+#define aes128_encrypt aes_encrypt
+#define aes192_encrypt aes_encrypt
+#define aes256_encrypt aes_encrypt
+#define aes128_decrypt aes_decrypt
+#define aes192_decrypt aes_decrypt
+#define aes256_decrypt aes_decrypt
+#else
+typedef nettle_cipher_func * QCryptoCipherNettleFuncNative;
+typedef const void * cipher_ctx_t;
+typedef size_t       cipher_length_t;
+#endif
+
+typedef struct QCryptoNettleAES128 {
+    struct aes128_ctx enc;
+    struct aes128_ctx dec;
+} QCryptoNettleAES128;
+
+typedef struct QCryptoNettleAES192 {
+    struct aes192_ctx enc;
+    struct aes192_ctx dec;
+} QCryptoNettleAES192;
+
+typedef struct QCryptoNettleAES256 {
+    struct aes256_ctx enc;
+    struct aes256_ctx dec;
+} QCryptoNettleAES256;
+
+static void aes128_encrypt_native(cipher_ctx_t ctx, cipher_length_t length,
+                                  uint8_t *dst, const uint8_t *src)
+{
+    const QCryptoNettleAES128 *aesctx = ctx;
+    aes128_encrypt(&aesctx->enc, length, dst, src);
+}
+
+static void aes128_decrypt_native(cipher_ctx_t ctx, cipher_length_t length,
+                                  uint8_t *dst, const uint8_t *src)
+{
+    const QCryptoNettleAES128 *aesctx = ctx;
+    aes128_decrypt(&aesctx->dec, length, dst, src);
+}
+
+static void aes192_encrypt_native(cipher_ctx_t ctx, cipher_length_t length,
+                               uint8_t *dst, const uint8_t *src)
+{
+    const QCryptoNettleAES192 *aesctx = ctx;
+    aes192_encrypt(&aesctx->enc, length, dst, src);
+}
+
+static void aes192_decrypt_native(cipher_ctx_t ctx, cipher_length_t length,
+                               uint8_t *dst, const uint8_t *src)
+{
+    const QCryptoNettleAES192 *aesctx = ctx;
+    aes192_decrypt(&aesctx->dec, length, dst, src);
+}
+
+static void aes256_encrypt_native(cipher_ctx_t ctx, cipher_length_t length,
+                               uint8_t *dst, const uint8_t *src)
+{
+    const QCryptoNettleAES256 *aesctx = ctx;
+    aes256_encrypt(&aesctx->enc, length, dst, src);
+}
+
+static void aes256_decrypt_native(cipher_ctx_t ctx, cipher_length_t length,
+                               uint8_t *dst, const uint8_t *src)
+{
+    const QCryptoNettleAES256 *aesctx = ctx;
+    aes256_decrypt(&aesctx->dec, length, dst, src);
+}
+
+static void des_encrypt_native(cipher_ctx_t ctx, cipher_length_t length,
+                               uint8_t *dst, const uint8_t *src)
+{
+    des_encrypt(ctx, length, dst, src);
+}
+
+static void des_decrypt_native(cipher_ctx_t ctx, cipher_length_t length,
+                               uint8_t *dst, const uint8_t *src)
+{
+    des_decrypt(ctx, length, dst, src);
+}
+
+static void des3_encrypt_native(cipher_ctx_t ctx, cipher_length_t length,
+                                uint8_t *dst, const uint8_t *src)
+{
+    des3_encrypt(ctx, length, dst, src);
+}
+
+static void des3_decrypt_native(cipher_ctx_t ctx, cipher_length_t length,
+                                uint8_t *dst, const uint8_t *src)
+{
+    des3_decrypt(ctx, length, dst, src);
+}
+
+static void cast128_encrypt_native(cipher_ctx_t ctx, cipher_length_t length,
+                                   uint8_t *dst, const uint8_t *src)
+{
+    cast128_encrypt(ctx, length, dst, src);
+}
+
+static void cast128_decrypt_native(cipher_ctx_t ctx, cipher_length_t length,
+                                   uint8_t *dst, const uint8_t *src)
+{
+    cast128_decrypt(ctx, length, dst, src);
+}
+
+static void serpent_encrypt_native(cipher_ctx_t ctx, cipher_length_t length,
+                                   uint8_t *dst, const uint8_t *src)
+{
+    serpent_encrypt(ctx, length, dst, src);
+}
+
+static void serpent_decrypt_native(cipher_ctx_t ctx, cipher_length_t length,
+                                   uint8_t *dst, const uint8_t *src)
+{
+    serpent_decrypt(ctx, length, dst, src);
+}
+
+static void twofish_encrypt_native(cipher_ctx_t ctx, cipher_length_t length,
+                                   uint8_t *dst, const uint8_t *src)
+{
+    twofish_encrypt(ctx, length, dst, src);
+}
+
+static void twofish_decrypt_native(cipher_ctx_t ctx, cipher_length_t length,
+                                   uint8_t *dst, const uint8_t *src)
+{
+    twofish_decrypt(ctx, length, dst, src);
+}
+
+static void aes128_encrypt_wrapper(const void *ctx, size_t length,
+                                uint8_t *dst, const uint8_t *src)
+{
+    const QCryptoNettleAES128 *aesctx = ctx;
+    aes128_encrypt(&aesctx->enc, length, dst, src);
+}
+
+static void aes128_decrypt_wrapper(const void *ctx, size_t length,
+                                uint8_t *dst, const uint8_t *src)
+{
+    const QCryptoNettleAES128 *aesctx = ctx;
+    aes128_decrypt(&aesctx->dec, length, dst, src);
+}
+
+static void aes192_encrypt_wrapper(const void *ctx, size_t length,
+                                uint8_t *dst, const uint8_t *src)
+{
+    const QCryptoNettleAES192 *aesctx = ctx;
+    aes192_encrypt(&aesctx->enc, length, dst, src);
+}
+
+static void aes192_decrypt_wrapper(const void *ctx, size_t length,
+                                uint8_t *dst, const uint8_t *src)
+{
+    const QCryptoNettleAES192 *aesctx = ctx;
+    aes192_decrypt(&aesctx->dec, length, dst, src);
+}
+
+static void aes256_encrypt_wrapper(const void *ctx, size_t length,
+                                uint8_t *dst, const uint8_t *src)
+{
+    const QCryptoNettleAES256 *aesctx = ctx;
+    aes256_encrypt(&aesctx->enc, length, dst, src);
+}
+
+static void aes256_decrypt_wrapper(const void *ctx, size_t length,
+                                uint8_t *dst, const uint8_t *src)
+{
+    const QCryptoNettleAES256 *aesctx = ctx;
+    aes256_decrypt(&aesctx->dec, length, dst, src);
+}
+
+static void des_encrypt_wrapper(const void *ctx, size_t length,
+                                uint8_t *dst, const uint8_t *src)
+{
+    des_encrypt(ctx, length, dst, src);
+}
+
+static void des_decrypt_wrapper(const void *ctx, size_t length,
+                                uint8_t *dst, const uint8_t *src)
+{
+    des_decrypt(ctx, length, dst, src);
+}
+
+static void des3_encrypt_wrapper(const void *ctx, size_t length,
+                                uint8_t *dst, const uint8_t *src)
+{
+    des3_encrypt(ctx, length, dst, src);
+}
+
+static void des3_decrypt_wrapper(const void *ctx, size_t length,
+                                uint8_t *dst, const uint8_t *src)
+{
+    des3_decrypt(ctx, length, dst, src);
+}
+
+static void cast128_encrypt_wrapper(const void *ctx, size_t length,
+                                    uint8_t *dst, const uint8_t *src)
+{
+    cast128_encrypt(ctx, length, dst, src);
+}
+
+static void cast128_decrypt_wrapper(const void *ctx, size_t length,
+                                    uint8_t *dst, const uint8_t *src)
+{
+    cast128_decrypt(ctx, length, dst, src);
+}
+
+static void serpent_encrypt_wrapper(const void *ctx, size_t length,
+                                    uint8_t *dst, const uint8_t *src)
+{
+    serpent_encrypt(ctx, length, dst, src);
+}
+
+static void serpent_decrypt_wrapper(const void *ctx, size_t length,
+                                    uint8_t *dst, const uint8_t *src)
+{
+    serpent_decrypt(ctx, length, dst, src);
+}
+
+static void twofish_encrypt_wrapper(const void *ctx, size_t length,
+                                    uint8_t *dst, const uint8_t *src)
+{
+    twofish_encrypt(ctx, length, dst, src);
+}
+
+static void twofish_decrypt_wrapper(const void *ctx, size_t length,
+                                    uint8_t *dst, const uint8_t *src)
+{
+    twofish_decrypt(ctx, length, dst, src);
+}
+
+typedef struct QCryptoCipherNettle QCryptoCipherNettle;
+struct QCryptoCipherNettle {
+    /* Primary cipher context for all modes */
+    void *ctx;
+    /* Second cipher context for XTS mode only */
+    void *ctx_tweak;
+    /* Cipher callbacks for both contexts */
+    QCryptoCipherNettleFuncNative alg_encrypt_native;
+    QCryptoCipherNettleFuncNative alg_decrypt_native;
+    QCryptoCipherNettleFuncWrapper alg_encrypt_wrapper;
+    QCryptoCipherNettleFuncWrapper alg_decrypt_wrapper;
+    /* Initialization vector or Counter */
+    uint8_t *iv;
+    size_t blocksize;
+};
+
+bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg,
+                             QCryptoCipherMode mode)
+{
+    switch (alg) {
+    case QCRYPTO_CIPHER_ALG_DES_RFB:
+    case QCRYPTO_CIPHER_ALG_3DES:
+    case QCRYPTO_CIPHER_ALG_AES_128:
+    case QCRYPTO_CIPHER_ALG_AES_192:
+    case QCRYPTO_CIPHER_ALG_AES_256:
+    case QCRYPTO_CIPHER_ALG_CAST5_128:
+    case QCRYPTO_CIPHER_ALG_SERPENT_128:
+    case QCRYPTO_CIPHER_ALG_SERPENT_192:
+    case QCRYPTO_CIPHER_ALG_SERPENT_256:
+    case QCRYPTO_CIPHER_ALG_TWOFISH_128:
+    case QCRYPTO_CIPHER_ALG_TWOFISH_192:
+    case QCRYPTO_CIPHER_ALG_TWOFISH_256:
+        break;
+    default:
+        return false;
+    }
+
+    switch (mode) {
+    case QCRYPTO_CIPHER_MODE_ECB:
+    case QCRYPTO_CIPHER_MODE_CBC:
+    case QCRYPTO_CIPHER_MODE_XTS:
+    case QCRYPTO_CIPHER_MODE_CTR:
+        return true;
+    default:
+        return false;
+    }
+}
+
+
+static void
+qcrypto_nettle_cipher_free_ctx(QCryptoCipherNettle *ctx)
+{
+    if (!ctx) {
+        return;
+    }
+
+    g_free(ctx->iv);
+    g_free(ctx->ctx);
+    g_free(ctx->ctx_tweak);
+    g_free(ctx);
+}
+
+
+static QCryptoCipherNettle *qcrypto_cipher_ctx_new(QCryptoCipherAlgorithm alg,
+                                                   QCryptoCipherMode mode,
+                                                   const uint8_t *key,
+                                                   size_t nkey,
+                                                   Error **errp)
+{
+    QCryptoCipherNettle *ctx;
+    uint8_t *rfbkey;
+
+    switch (mode) {
+    case QCRYPTO_CIPHER_MODE_ECB:
+    case QCRYPTO_CIPHER_MODE_CBC:
+    case QCRYPTO_CIPHER_MODE_XTS:
+    case QCRYPTO_CIPHER_MODE_CTR:
+        break;
+    default:
+        error_setg(errp, "Unsupported cipher mode %s",
+                   QCryptoCipherMode_str(mode));
+        return NULL;
+    }
+
+    if (!qcrypto_cipher_validate_key_length(alg, mode, nkey, errp)) {
+        return NULL;
+    }
+
+    ctx = g_new0(QCryptoCipherNettle, 1);
+
+    switch (alg) {
+    case QCRYPTO_CIPHER_ALG_DES_RFB:
+        ctx->ctx = g_new0(struct des_ctx, 1);
+        rfbkey = qcrypto_cipher_munge_des_rfb_key(key, nkey);
+        des_set_key(ctx->ctx, rfbkey);
+        g_free(rfbkey);
+
+        ctx->alg_encrypt_native = des_encrypt_native;
+        ctx->alg_decrypt_native = des_decrypt_native;
+        ctx->alg_encrypt_wrapper = des_encrypt_wrapper;
+        ctx->alg_decrypt_wrapper = des_decrypt_wrapper;
+
+        ctx->blocksize = DES_BLOCK_SIZE;
+        break;
+
+    case QCRYPTO_CIPHER_ALG_3DES:
+        ctx->ctx = g_new0(struct des3_ctx, 1);
+        des3_set_key(ctx->ctx, key);
+
+        ctx->alg_encrypt_native = des3_encrypt_native;
+        ctx->alg_decrypt_native = des3_decrypt_native;
+        ctx->alg_encrypt_wrapper = des3_encrypt_wrapper;
+        ctx->alg_decrypt_wrapper = des3_decrypt_wrapper;
+
+        ctx->blocksize = DES3_BLOCK_SIZE;
+        break;
+
+    case QCRYPTO_CIPHER_ALG_AES_128:
+        ctx->ctx = g_new0(QCryptoNettleAES128, 1);
+
+        if (mode == QCRYPTO_CIPHER_MODE_XTS) {
+            ctx->ctx_tweak = g_new0(QCryptoNettleAES128, 1);
+
+            nkey /= 2;
+            aes128_set_encrypt_key(&((QCryptoNettleAES128 *)ctx->ctx)->enc,
+                                   key);
+            aes128_set_decrypt_key(&((QCryptoNettleAES128 *)ctx->ctx)->dec,
+                                   key);
+
+            aes128_set_encrypt_key(&((QCryptoNettleAES128 *)ctx->ctx_tweak)->
+                                   enc, key + nkey);
+            aes128_set_decrypt_key(&((QCryptoNettleAES128 *)ctx->ctx_tweak)->
+                                   dec, key + nkey);
+        } else {
+            aes128_set_encrypt_key(&((QCryptoNettleAES128 *)ctx->ctx)->enc,
+                                   key);
+            aes128_set_decrypt_key(&((QCryptoNettleAES128 *)ctx->ctx)->dec,
+                                   key);
+        }
+
+        ctx->alg_encrypt_native = aes128_encrypt_native;
+        ctx->alg_decrypt_native = aes128_decrypt_native;
+        ctx->alg_encrypt_wrapper = aes128_encrypt_wrapper;
+        ctx->alg_decrypt_wrapper = aes128_decrypt_wrapper;
+
+        ctx->blocksize = AES_BLOCK_SIZE;
+        break;
+
+    case QCRYPTO_CIPHER_ALG_AES_192:
+        ctx->ctx = g_new0(QCryptoNettleAES192, 1);
+
+        if (mode == QCRYPTO_CIPHER_MODE_XTS) {
+            ctx->ctx_tweak = g_new0(QCryptoNettleAES192, 1);
+
+            nkey /= 2;
+            aes192_set_encrypt_key(&((QCryptoNettleAES192 *)ctx->ctx)->enc,
+                                   key);
+            aes192_set_decrypt_key(&((QCryptoNettleAES192 *)ctx->ctx)->dec,
+                                   key);
+
+            aes192_set_encrypt_key(&((QCryptoNettleAES192 *)ctx->ctx_tweak)->
+                                   enc, key + nkey);
+            aes192_set_decrypt_key(&((QCryptoNettleAES192 *)ctx->ctx_tweak)->
+                                   dec, key + nkey);
+        } else {
+            aes192_set_encrypt_key(&((QCryptoNettleAES192 *)ctx->ctx)->enc,
+                                   key);
+            aes192_set_decrypt_key(&((QCryptoNettleAES192 *)ctx->ctx)->dec,
+                                   key);
+        }
+
+        ctx->alg_encrypt_native = aes192_encrypt_native;
+        ctx->alg_decrypt_native = aes192_decrypt_native;
+        ctx->alg_encrypt_wrapper = aes192_encrypt_wrapper;
+        ctx->alg_decrypt_wrapper = aes192_decrypt_wrapper;
+
+        ctx->blocksize = AES_BLOCK_SIZE;
+        break;
+
+    case QCRYPTO_CIPHER_ALG_AES_256:
+        ctx->ctx = g_new0(QCryptoNettleAES256, 1);
+
+        if (mode == QCRYPTO_CIPHER_MODE_XTS) {
+            ctx->ctx_tweak = g_new0(QCryptoNettleAES256, 1);
+
+            nkey /= 2;
+            aes256_set_encrypt_key(&((QCryptoNettleAES256 *)ctx->ctx)->enc,
+                                   key);
+            aes256_set_decrypt_key(&((QCryptoNettleAES256 *)ctx->ctx)->dec,
+                                   key);
+
+            aes256_set_encrypt_key(&((QCryptoNettleAES256 *)ctx->ctx_tweak)->
+                                   enc, key + nkey);
+            aes256_set_decrypt_key(&((QCryptoNettleAES256 *)ctx->ctx_tweak)->
+                                   dec, key + nkey);
+        } else {
+            aes256_set_encrypt_key(&((QCryptoNettleAES256 *)ctx->ctx)->enc,
+                                   key);
+            aes256_set_decrypt_key(&((QCryptoNettleAES256 *)ctx->ctx)->dec,
+                                   key);
+        }
+
+        ctx->alg_encrypt_native = aes256_encrypt_native;
+        ctx->alg_decrypt_native = aes256_decrypt_native;
+        ctx->alg_encrypt_wrapper = aes256_encrypt_wrapper;
+        ctx->alg_decrypt_wrapper = aes256_decrypt_wrapper;
+
+        ctx->blocksize = AES_BLOCK_SIZE;
+        break;
+
+    case QCRYPTO_CIPHER_ALG_CAST5_128:
+        ctx->ctx = g_new0(struct cast128_ctx, 1);
+
+        if (mode == QCRYPTO_CIPHER_MODE_XTS) {
+            ctx->ctx_tweak = g_new0(struct cast128_ctx, 1);
+
+            nkey /= 2;
+            cast5_set_key(ctx->ctx, nkey, key);
+            cast5_set_key(ctx->ctx_tweak, nkey, key + nkey);
+        } else {
+            cast5_set_key(ctx->ctx, nkey, key);
+        }
+
+        ctx->alg_encrypt_native = cast128_encrypt_native;
+        ctx->alg_decrypt_native = cast128_decrypt_native;
+        ctx->alg_encrypt_wrapper = cast128_encrypt_wrapper;
+        ctx->alg_decrypt_wrapper = cast128_decrypt_wrapper;
+
+        ctx->blocksize = CAST128_BLOCK_SIZE;
+        break;
+
+    case QCRYPTO_CIPHER_ALG_SERPENT_128:
+    case QCRYPTO_CIPHER_ALG_SERPENT_192:
+    case QCRYPTO_CIPHER_ALG_SERPENT_256:
+        ctx->ctx = g_new0(struct serpent_ctx, 1);
+
+        if (mode == QCRYPTO_CIPHER_MODE_XTS) {
+            ctx->ctx_tweak = g_new0(struct serpent_ctx, 1);
+
+            nkey /= 2;
+            serpent_set_key(ctx->ctx, nkey, key);
+            serpent_set_key(ctx->ctx_tweak, nkey, key + nkey);
+        } else {
+            serpent_set_key(ctx->ctx, nkey, key);
+        }
+
+        ctx->alg_encrypt_native = serpent_encrypt_native;
+        ctx->alg_decrypt_native = serpent_decrypt_native;
+        ctx->alg_encrypt_wrapper = serpent_encrypt_wrapper;
+        ctx->alg_decrypt_wrapper = serpent_decrypt_wrapper;
+
+        ctx->blocksize = SERPENT_BLOCK_SIZE;
+        break;
+
+    case QCRYPTO_CIPHER_ALG_TWOFISH_128:
+    case QCRYPTO_CIPHER_ALG_TWOFISH_192:
+    case QCRYPTO_CIPHER_ALG_TWOFISH_256:
+        ctx->ctx = g_new0(struct twofish_ctx, 1);
+
+        if (mode == QCRYPTO_CIPHER_MODE_XTS) {
+            ctx->ctx_tweak = g_new0(struct twofish_ctx, 1);
+
+            nkey /= 2;
+            twofish_set_key(ctx->ctx, nkey, key);
+            twofish_set_key(ctx->ctx_tweak, nkey, key + nkey);
+        } else {
+            twofish_set_key(ctx->ctx, nkey, key);
+        }
+
+        ctx->alg_encrypt_native = twofish_encrypt_native;
+        ctx->alg_decrypt_native = twofish_decrypt_native;
+        ctx->alg_encrypt_wrapper = twofish_encrypt_wrapper;
+        ctx->alg_decrypt_wrapper = twofish_decrypt_wrapper;
+
+        ctx->blocksize = TWOFISH_BLOCK_SIZE;
+        break;
+
+    default:
+        error_setg(errp, "Unsupported cipher algorithm %s",
+                   QCryptoCipherAlgorithm_str(alg));
+        goto error;
+    }
+    g_assert(is_power_of_2(ctx->blocksize));
+
+    if (mode == QCRYPTO_CIPHER_MODE_XTS &&
+        ctx->blocksize != XTS_BLOCK_SIZE) {
+        error_setg(errp, "Cipher block size %zu must equal XTS block size %d",
+                   ctx->blocksize, XTS_BLOCK_SIZE);
+        goto error;
+    }
+
+    ctx->iv = g_new0(uint8_t, ctx->blocksize);
+
+    return ctx;
+
+ error:
+    qcrypto_nettle_cipher_free_ctx(ctx);
+    return NULL;
+}
+
+
+static void
+qcrypto_nettle_cipher_ctx_free(QCryptoCipher *cipher)
+{
+    QCryptoCipherNettle *ctx;
+
+    ctx = cipher->opaque;
+    qcrypto_nettle_cipher_free_ctx(ctx);
+}
+
+
+static int
+qcrypto_nettle_cipher_encrypt(QCryptoCipher *cipher,
+                              const void *in,
+                              void *out,
+                              size_t len,
+                              Error **errp)
+{
+    QCryptoCipherNettle *ctx = cipher->opaque;
+
+    if (len & (ctx->blocksize - 1)) {
+        error_setg(errp, "Length %zu must be a multiple of block size %zu",
+                   len, ctx->blocksize);
+        return -1;
+    }
+
+    switch (cipher->mode) {
+    case QCRYPTO_CIPHER_MODE_ECB:
+        ctx->alg_encrypt_wrapper(ctx->ctx, len, out, in);
+        break;
+
+    case QCRYPTO_CIPHER_MODE_CBC:
+        cbc_encrypt(ctx->ctx, ctx->alg_encrypt_native,
+                    ctx->blocksize, ctx->iv,
+                    len, out, in);
+        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:
+        ctr_crypt(ctx->ctx, ctx->alg_encrypt_native,
+                    ctx->blocksize, ctx->iv,
+                    len, out, in);
+        break;
+
+    default:
+        error_setg(errp, "Unsupported cipher mode %s",
+                   QCryptoCipherMode_str(cipher->mode));
+        return -1;
+    }
+    return 0;
+}
+
+
+static int
+qcrypto_nettle_cipher_decrypt(QCryptoCipher *cipher,
+                              const void *in,
+                              void *out,
+                              size_t len,
+                              Error **errp)
+{
+    QCryptoCipherNettle *ctx = cipher->opaque;
+
+    if (len & (ctx->blocksize - 1)) {
+        error_setg(errp, "Length %zu must be a multiple of block size %zu",
+                   len, ctx->blocksize);
+        return -1;
+    }
+
+    switch (cipher->mode) {
+    case QCRYPTO_CIPHER_MODE_ECB:
+        ctx->alg_decrypt_wrapper(ctx->ctx, len, out, in);
+        break;
+
+    case QCRYPTO_CIPHER_MODE_CBC:
+        cbc_decrypt(ctx->ctx, ctx->alg_decrypt_native,
+                    ctx->blocksize, ctx->iv,
+                    len, out, in);
+        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,
+                    ctx->blocksize, ctx->iv,
+                    len, out, in);
+        break;
+
+    default:
+        error_setg(errp, "Unsupported cipher mode %s",
+                   QCryptoCipherMode_str(cipher->mode));
+        return -1;
+    }
+    return 0;
+}
+
+static int
+qcrypto_nettle_cipher_setiv(QCryptoCipher *cipher,
+                            const uint8_t *iv, size_t niv,
+                            Error **errp)
+{
+    QCryptoCipherNettle *ctx = cipher->opaque;
+    if (niv != ctx->blocksize) {
+        error_setg(errp, "Expected IV size %zu not %zu",
+                   ctx->blocksize, niv);
+        return -1;
+    }
+    memcpy(ctx->iv, iv, niv);
+    return 0;
+}
+
+
+static struct QCryptoCipherDriver qcrypto_cipher_lib_driver = {
+    .cipher_encrypt = qcrypto_nettle_cipher_encrypt,
+    .cipher_decrypt = qcrypto_nettle_cipher_decrypt,
+    .cipher_setiv = qcrypto_nettle_cipher_setiv,
+    .cipher_free = qcrypto_nettle_cipher_ctx_free,
+};