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-rw-r--r--crypto/cipher-builtin.c.inc532
1 files changed, 532 insertions, 0 deletions
diff --git a/crypto/cipher-builtin.c.inc b/crypto/cipher-builtin.c.inc
new file mode 100644
index 0000000000..6eafd39da0
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+++ b/crypto/cipher-builtin.c.inc
@@ -0,0 +1,532 @@
+/*
+ * QEMU Crypto cipher built-in 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"
+#include "crypto/aes.h"
+#include "crypto/desrfb.h"
+#include "crypto/xts.h"
+#include "cipherpriv.h"
+
+typedef struct QCryptoCipherBuiltinAESContext QCryptoCipherBuiltinAESContext;
+struct QCryptoCipherBuiltinAESContext {
+ AES_KEY enc;
+ AES_KEY dec;
+};
+typedef struct QCryptoCipherBuiltinAES QCryptoCipherBuiltinAES;
+struct QCryptoCipherBuiltinAES {
+ QCryptoCipherBuiltinAESContext key;
+ QCryptoCipherBuiltinAESContext key_tweak;
+ uint8_t iv[AES_BLOCK_SIZE];
+};
+typedef struct QCryptoCipherBuiltinDESRFB QCryptoCipherBuiltinDESRFB;
+struct QCryptoCipherBuiltinDESRFB {
+ uint8_t *key;
+ size_t nkey;
+};
+
+typedef struct QCryptoCipherBuiltin QCryptoCipherBuiltin;
+struct QCryptoCipherBuiltin {
+ union {
+ QCryptoCipherBuiltinAES aes;
+ QCryptoCipherBuiltinDESRFB desrfb;
+ } state;
+ size_t blocksize;
+ void (*free)(QCryptoCipher *cipher);
+ int (*setiv)(QCryptoCipher *cipher,
+ const uint8_t *iv, size_t niv,
+ Error **errp);
+ int (*encrypt)(QCryptoCipher *cipher,
+ const void *in,
+ void *out,
+ size_t len,
+ Error **errp);
+ int (*decrypt)(QCryptoCipher *cipher,
+ const void *in,
+ void *out,
+ size_t len,
+ Error **errp);
+};
+
+
+static void qcrypto_cipher_free_aes(QCryptoCipher *cipher)
+{
+ QCryptoCipherBuiltin *ctxt = cipher->opaque;
+
+ g_free(ctxt);
+ cipher->opaque = NULL;
+}
+
+
+static void qcrypto_cipher_aes_ecb_encrypt(const AES_KEY *key,
+ const void *in,
+ void *out,
+ size_t len)
+{
+ const uint8_t *inptr = in;
+ uint8_t *outptr = out;
+ while (len) {
+ if (len > AES_BLOCK_SIZE) {
+ AES_encrypt(inptr, outptr, key);
+ inptr += AES_BLOCK_SIZE;
+ outptr += AES_BLOCK_SIZE;
+ len -= AES_BLOCK_SIZE;
+ } else {
+ uint8_t tmp1[AES_BLOCK_SIZE], tmp2[AES_BLOCK_SIZE];
+ memcpy(tmp1, inptr, len);
+ /* Fill with 0 to avoid valgrind uninitialized reads */
+ memset(tmp1 + len, 0, sizeof(tmp1) - len);
+ AES_encrypt(tmp1, tmp2, key);
+ memcpy(outptr, tmp2, len);
+ len = 0;
+ }
+ }
+}
+
+
+static void qcrypto_cipher_aes_ecb_decrypt(const AES_KEY *key,
+ const void *in,
+ void *out,
+ size_t len)
+{
+ const uint8_t *inptr = in;
+ uint8_t *outptr = out;
+ while (len) {
+ if (len > AES_BLOCK_SIZE) {
+ AES_decrypt(inptr, outptr, key);
+ inptr += AES_BLOCK_SIZE;
+ outptr += AES_BLOCK_SIZE;
+ len -= AES_BLOCK_SIZE;
+ } else {
+ uint8_t tmp1[AES_BLOCK_SIZE], tmp2[AES_BLOCK_SIZE];
+ memcpy(tmp1, inptr, len);
+ /* Fill with 0 to avoid valgrind uninitialized reads */
+ memset(tmp1 + len, 0, sizeof(tmp1) - len);
+ AES_decrypt(tmp1, tmp2, key);
+ memcpy(outptr, tmp2, len);
+ len = 0;
+ }
+ }
+}
+
+
+static void qcrypto_cipher_aes_xts_encrypt(const void *ctx,
+ size_t length,
+ uint8_t *dst,
+ const uint8_t *src)
+{
+ const QCryptoCipherBuiltinAESContext *aesctx = ctx;
+
+ qcrypto_cipher_aes_ecb_encrypt(&aesctx->enc, src, dst, length);
+}
+
+
+static void qcrypto_cipher_aes_xts_decrypt(const void *ctx,
+ size_t length,
+ uint8_t *dst,
+ const uint8_t *src)
+{
+ const QCryptoCipherBuiltinAESContext *aesctx = ctx;
+
+ qcrypto_cipher_aes_ecb_decrypt(&aesctx->dec, src, dst, length);
+}
+
+
+static int qcrypto_cipher_encrypt_aes(QCryptoCipher *cipher,
+ const void *in,
+ void *out,
+ size_t len,
+ Error **errp)
+{
+ QCryptoCipherBuiltin *ctxt = cipher->opaque;
+
+ switch (cipher->mode) {
+ case QCRYPTO_CIPHER_MODE_ECB:
+ qcrypto_cipher_aes_ecb_encrypt(&ctxt->state.aes.key.enc,
+ in, out, len);
+ break;
+ case QCRYPTO_CIPHER_MODE_CBC:
+ AES_cbc_encrypt(in, out, len,
+ &ctxt->state.aes.key.enc,
+ ctxt->state.aes.iv, 1);
+ break;
+ case QCRYPTO_CIPHER_MODE_XTS:
+ xts_encrypt(&ctxt->state.aes.key,
+ &ctxt->state.aes.key_tweak,
+ qcrypto_cipher_aes_xts_encrypt,
+ qcrypto_cipher_aes_xts_decrypt,
+ ctxt->state.aes.iv,
+ len, out, in);
+ break;
+ default:
+ g_assert_not_reached();
+ }
+
+ return 0;
+}
+
+
+static int qcrypto_cipher_decrypt_aes(QCryptoCipher *cipher,
+ const void *in,
+ void *out,
+ size_t len,
+ Error **errp)
+{
+ QCryptoCipherBuiltin *ctxt = cipher->opaque;
+
+ switch (cipher->mode) {
+ case QCRYPTO_CIPHER_MODE_ECB:
+ qcrypto_cipher_aes_ecb_decrypt(&ctxt->state.aes.key.dec,
+ in, out, len);
+ break;
+ case QCRYPTO_CIPHER_MODE_CBC:
+ AES_cbc_encrypt(in, out, len,
+ &ctxt->state.aes.key.dec,
+ ctxt->state.aes.iv, 0);
+ break;
+ case QCRYPTO_CIPHER_MODE_XTS:
+ xts_decrypt(&ctxt->state.aes.key,
+ &ctxt->state.aes.key_tweak,
+ qcrypto_cipher_aes_xts_encrypt,
+ qcrypto_cipher_aes_xts_decrypt,
+ ctxt->state.aes.iv,
+ len, out, in);
+ break;
+ default:
+ g_assert_not_reached();
+ }
+
+ return 0;
+}
+
+static int qcrypto_cipher_setiv_aes(QCryptoCipher *cipher,
+ const uint8_t *iv, size_t niv,
+ Error **errp)
+{
+ QCryptoCipherBuiltin *ctxt = cipher->opaque;
+ if (niv != AES_BLOCK_SIZE) {
+ error_setg(errp, "IV must be %d bytes not %zu",
+ AES_BLOCK_SIZE, niv);
+ return -1;
+ }
+
+ memcpy(ctxt->state.aes.iv, iv, AES_BLOCK_SIZE);
+
+ return 0;
+}
+
+
+
+
+static QCryptoCipherBuiltin *
+qcrypto_cipher_init_aes(QCryptoCipherMode mode,
+ const uint8_t *key, size_t nkey,
+ Error **errp)
+{
+ QCryptoCipherBuiltin *ctxt;
+
+ if (mode != QCRYPTO_CIPHER_MODE_CBC &&
+ mode != QCRYPTO_CIPHER_MODE_ECB &&
+ mode != QCRYPTO_CIPHER_MODE_XTS) {
+ error_setg(errp, "Unsupported cipher mode %s",
+ QCryptoCipherMode_str(mode));
+ return NULL;
+ }
+
+ ctxt = g_new0(QCryptoCipherBuiltin, 1);
+
+ if (mode == QCRYPTO_CIPHER_MODE_XTS) {
+ if (AES_set_encrypt_key(key, nkey * 4, &ctxt->state.aes.key.enc) != 0) {
+ error_setg(errp, "Failed to set encryption key");
+ goto error;
+ }
+
+ if (AES_set_decrypt_key(key, nkey * 4, &ctxt->state.aes.key.dec) != 0) {
+ error_setg(errp, "Failed to set decryption key");
+ goto error;
+ }
+
+ if (AES_set_encrypt_key(key + (nkey / 2), nkey * 4,
+ &ctxt->state.aes.key_tweak.enc) != 0) {
+ error_setg(errp, "Failed to set encryption key");
+ goto error;
+ }
+
+ if (AES_set_decrypt_key(key + (nkey / 2), nkey * 4,
+ &ctxt->state.aes.key_tweak.dec) != 0) {
+ error_setg(errp, "Failed to set decryption key");
+ goto error;
+ }
+ } else {
+ if (AES_set_encrypt_key(key, nkey * 8, &ctxt->state.aes.key.enc) != 0) {
+ error_setg(errp, "Failed to set encryption key");
+ goto error;
+ }
+
+ if (AES_set_decrypt_key(key, nkey * 8, &ctxt->state.aes.key.dec) != 0) {
+ error_setg(errp, "Failed to set decryption key");
+ goto error;
+ }
+ }
+
+ ctxt->blocksize = AES_BLOCK_SIZE;
+ ctxt->free = qcrypto_cipher_free_aes;
+ ctxt->setiv = qcrypto_cipher_setiv_aes;
+ ctxt->encrypt = qcrypto_cipher_encrypt_aes;
+ ctxt->decrypt = qcrypto_cipher_decrypt_aes;
+
+ return ctxt;
+
+ error:
+ g_free(ctxt);
+ return NULL;
+}
+
+
+static void qcrypto_cipher_free_des_rfb(QCryptoCipher *cipher)
+{
+ QCryptoCipherBuiltin *ctxt = cipher->opaque;
+
+ g_free(ctxt->state.desrfb.key);
+ g_free(ctxt);
+ cipher->opaque = NULL;
+}
+
+
+static int qcrypto_cipher_encrypt_des_rfb(QCryptoCipher *cipher,
+ const void *in,
+ void *out,
+ size_t len,
+ Error **errp)
+{
+ QCryptoCipherBuiltin *ctxt = cipher->opaque;
+ size_t i;
+
+ if (len % 8) {
+ error_setg(errp, "Buffer size must be multiple of 8 not %zu",
+ len);
+ return -1;
+ }
+
+ deskey(ctxt->state.desrfb.key, EN0);
+
+ for (i = 0; i < len; i += 8) {
+ des((void *)in + i, out + i);
+ }
+
+ return 0;
+}
+
+
+static int qcrypto_cipher_decrypt_des_rfb(QCryptoCipher *cipher,
+ const void *in,
+ void *out,
+ size_t len,
+ Error **errp)
+{
+ QCryptoCipherBuiltin *ctxt = cipher->opaque;
+ size_t i;
+
+ if (len % 8) {
+ error_setg(errp, "Buffer size must be multiple of 8 not %zu",
+ len);
+ return -1;
+ }
+
+ deskey(ctxt->state.desrfb.key, DE1);
+
+ for (i = 0; i < len; i += 8) {
+ des((void *)in + i, out + i);
+ }
+
+ return 0;
+}
+
+
+static int qcrypto_cipher_setiv_des_rfb(QCryptoCipher *cipher,
+ const uint8_t *iv, size_t niv,
+ Error **errp)
+{
+ error_setg(errp, "Setting IV is not supported");
+ return -1;
+}
+
+
+static QCryptoCipherBuiltin *
+qcrypto_cipher_init_des_rfb(QCryptoCipherMode mode,
+ const uint8_t *key, size_t nkey,
+ Error **errp)
+{
+ QCryptoCipherBuiltin *ctxt;
+
+ if (mode != QCRYPTO_CIPHER_MODE_ECB) {
+ error_setg(errp, "Unsupported cipher mode %s",
+ QCryptoCipherMode_str(mode));
+ return NULL;
+ }
+
+ ctxt = g_new0(QCryptoCipherBuiltin, 1);
+
+ ctxt->state.desrfb.key = g_new0(uint8_t, nkey);
+ memcpy(ctxt->state.desrfb.key, key, nkey);
+ ctxt->state.desrfb.nkey = nkey;
+
+ ctxt->blocksize = 8;
+ ctxt->free = qcrypto_cipher_free_des_rfb;
+ ctxt->setiv = qcrypto_cipher_setiv_des_rfb;
+ ctxt->encrypt = qcrypto_cipher_encrypt_des_rfb;
+ ctxt->decrypt = qcrypto_cipher_decrypt_des_rfb;
+
+ return ctxt;
+}
+
+
+bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg,
+ QCryptoCipherMode mode)
+{
+ switch (alg) {
+ case QCRYPTO_CIPHER_ALG_DES_RFB:
+ case QCRYPTO_CIPHER_ALG_AES_128:
+ case QCRYPTO_CIPHER_ALG_AES_192:
+ case QCRYPTO_CIPHER_ALG_AES_256:
+ break;
+ default:
+ return false;
+ }
+
+ switch (mode) {
+ case QCRYPTO_CIPHER_MODE_ECB:
+ case QCRYPTO_CIPHER_MODE_CBC:
+ case QCRYPTO_CIPHER_MODE_XTS:
+ return true;
+ case QCRYPTO_CIPHER_MODE_CTR:
+ return false;
+ default:
+ return false;
+ }
+}
+
+
+static QCryptoCipherBuiltin *qcrypto_cipher_ctx_new(QCryptoCipherAlgorithm alg,
+ QCryptoCipherMode mode,
+ const uint8_t *key,
+ size_t nkey,
+ Error **errp)
+{
+ QCryptoCipherBuiltin *ctxt;
+
+ switch (mode) {
+ case QCRYPTO_CIPHER_MODE_ECB:
+ case QCRYPTO_CIPHER_MODE_CBC:
+ case QCRYPTO_CIPHER_MODE_XTS:
+ 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;
+ }
+
+ switch (alg) {
+ case QCRYPTO_CIPHER_ALG_DES_RFB:
+ ctxt = qcrypto_cipher_init_des_rfb(mode, key, nkey, errp);
+ break;
+ case QCRYPTO_CIPHER_ALG_AES_128:
+ case QCRYPTO_CIPHER_ALG_AES_192:
+ case QCRYPTO_CIPHER_ALG_AES_256:
+ ctxt = qcrypto_cipher_init_aes(mode, key, nkey, errp);
+ break;
+ default:
+ error_setg(errp,
+ "Unsupported cipher algorithm %s",
+ QCryptoCipherAlgorithm_str(alg));
+ return NULL;
+ }
+
+ return ctxt;
+}
+
+static void
+qcrypto_builtin_cipher_ctx_free(QCryptoCipher *cipher)
+{
+ QCryptoCipherBuiltin *ctxt;
+
+ ctxt = cipher->opaque;
+ ctxt->free(cipher);
+}
+
+
+static int
+qcrypto_builtin_cipher_encrypt(QCryptoCipher *cipher,
+ const void *in,
+ void *out,
+ size_t len,
+ Error **errp)
+{
+ QCryptoCipherBuiltin *ctxt = cipher->opaque;
+
+ if (len & (ctxt->blocksize - 1)) {
+ error_setg(errp, "Length %zu must be a multiple of block size %zu",
+ len, ctxt->blocksize);
+ return -1;
+ }
+
+ return ctxt->encrypt(cipher, in, out, len, errp);
+}
+
+
+static int
+qcrypto_builtin_cipher_decrypt(QCryptoCipher *cipher,
+ const void *in,
+ void *out,
+ size_t len,
+ Error **errp)
+{
+ QCryptoCipherBuiltin *ctxt = cipher->opaque;
+
+ if (len & (ctxt->blocksize - 1)) {
+ error_setg(errp, "Length %zu must be a multiple of block size %zu",
+ len, ctxt->blocksize);
+ return -1;
+ }
+
+ return ctxt->decrypt(cipher, in, out, len, errp);
+}
+
+
+static int
+qcrypto_builtin_cipher_setiv(QCryptoCipher *cipher,
+ const uint8_t *iv, size_t niv,
+ Error **errp)
+{
+ QCryptoCipherBuiltin *ctxt = cipher->opaque;
+
+ return ctxt->setiv(cipher, iv, niv, errp);
+}
+
+
+static struct QCryptoCipherDriver qcrypto_cipher_lib_driver = {
+ .cipher_encrypt = qcrypto_builtin_cipher_encrypt,
+ .cipher_decrypt = qcrypto_builtin_cipher_decrypt,
+ .cipher_setiv = qcrypto_builtin_cipher_setiv,
+ .cipher_free = qcrypto_builtin_cipher_ctx_free,
+};
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