#include "qemu/osdep.h"
#include "crypto/xts.h"
+#include "cipherpriv.h"
#include <gcrypt.h>
-bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg)
+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_SERPENT_256:
case QCRYPTO_CIPHER_ALG_TWOFISH_128:
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;
gcry_cipher_hd_t handle;
gcry_cipher_hd_t tweakhandle;
size_t blocksize;
+ /* Initialization vector or Counter */
uint8_t *iv;
};
-QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg,
- QCryptoCipherMode mode,
- const uint8_t *key, size_t nkey,
- Error **errp)
+static void
+qcrypto_gcrypt_cipher_free_ctx(QCryptoCipherGcrypt *ctx,
+ QCryptoCipherMode mode)
+{
+ if (!ctx) {
+ return;
+ }
+
+ gcry_cipher_close(ctx->handle);
+ if (mode == QCRYPTO_CIPHER_MODE_XTS) {
+ gcry_cipher_close(ctx->tweakhandle);
+ }
+ g_free(ctx->iv);
+ g_free(ctx);
+}
+
+
+static QCryptoCipherGcrypt *qcrypto_cipher_ctx_new(QCryptoCipherAlgorithm alg,
+ QCryptoCipherMode mode,
+ const uint8_t *key,
+ size_t nkey,
+ Error **errp)
{
- QCryptoCipher *cipher;
QCryptoCipherGcrypt *ctx;
gcry_error_t err;
int gcryalg, gcrymode;
case QCRYPTO_CIPHER_MODE_CBC:
gcrymode = GCRY_CIPHER_MODE_CBC;
break;
+ case QCRYPTO_CIPHER_MODE_CTR:
+ gcrymode = GCRY_CIPHER_MODE_CTR;
+ break;
default:
- error_setg(errp, "Unsupported cipher mode %d", mode);
+ error_setg(errp, "Unsupported cipher mode %s",
+ QCryptoCipherMode_str(mode));
return NULL;
}
gcryalg = GCRY_CIPHER_DES;
break;
+ case QCRYPTO_CIPHER_ALG_3DES:
+ gcryalg = GCRY_CIPHER_3DES;
+ break;
+
case QCRYPTO_CIPHER_ALG_AES_128:
gcryalg = GCRY_CIPHER_AES128;
break;
break;
default:
- error_setg(errp, "Unsupported cipher algorithm %d", alg);
+ error_setg(errp, "Unsupported cipher algorithm %s",
+ QCryptoCipherAlgorithm_str(alg));
return NULL;
}
- cipher = g_new0(QCryptoCipher, 1);
- cipher->alg = alg;
- cipher->mode = mode;
-
ctx = g_new0(QCryptoCipherGcrypt, 1);
err = gcry_cipher_open(&ctx->handle, gcryalg, gcrymode, 0);
gcry_strerror(err));
goto error;
}
- if (cipher->mode == QCRYPTO_CIPHER_MODE_XTS) {
+ if (mode == QCRYPTO_CIPHER_MODE_XTS) {
err = gcry_cipher_open(&ctx->tweakhandle, gcryalg, gcrymode, 0);
if (err != 0) {
error_setg(errp, "Cannot initialize cipher: %s",
}
}
- if (cipher->alg == QCRYPTO_CIPHER_ALG_DES_RFB) {
+ if (alg == QCRYPTO_CIPHER_ALG_DES_RFB) {
/* We're using standard DES cipher from gcrypt, so we need
* to munge the key so that the results are the same as the
* bizarre RFB variant of DES :-)
g_free(rfbkey);
ctx->blocksize = 8;
} else {
- if (cipher->mode == QCRYPTO_CIPHER_MODE_XTS) {
+ if (mode == QCRYPTO_CIPHER_MODE_XTS) {
nkey /= 2;
err = gcry_cipher_setkey(ctx->handle, key, nkey);
if (err != 0) {
gcry_strerror(err));
goto error;
}
- switch (cipher->alg) {
+ switch (alg) {
case QCRYPTO_CIPHER_ALG_AES_128:
case QCRYPTO_CIPHER_ALG_AES_192:
case QCRYPTO_CIPHER_ALG_AES_256:
case QCRYPTO_CIPHER_ALG_TWOFISH_256:
ctx->blocksize = 16;
break;
+ case QCRYPTO_CIPHER_ALG_3DES:
case QCRYPTO_CIPHER_ALG_CAST5_128:
ctx->blocksize = 8;
break;
}
}
- if (cipher->mode == QCRYPTO_CIPHER_MODE_XTS) {
+ if (mode == QCRYPTO_CIPHER_MODE_XTS) {
+ if (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);
}
- cipher->opaque = ctx;
- return cipher;
+ return ctx;
error:
- gcry_cipher_close(ctx->handle);
- if (cipher->mode == QCRYPTO_CIPHER_MODE_XTS) {
- gcry_cipher_close(ctx->tweakhandle);
- }
- g_free(ctx);
- g_free(cipher);
+ qcrypto_gcrypt_cipher_free_ctx(ctx, mode);
return NULL;
}
-void qcrypto_cipher_free(QCryptoCipher *cipher)
+static void
+qcrypto_gcrypt_cipher_ctx_free(QCryptoCipher *cipher)
{
- QCryptoCipherGcrypt *ctx;
- if (!cipher) {
- return;
- }
- ctx = cipher->opaque;
- gcry_cipher_close(ctx->handle);
- if (cipher->mode == QCRYPTO_CIPHER_MODE_XTS) {
- gcry_cipher_close(ctx->tweakhandle);
- }
- g_free(ctx->iv);
- g_free(ctx);
- g_free(cipher);
+ qcrypto_gcrypt_cipher_free_ctx(cipher->opaque, cipher->mode);
}
g_assert(err == 0);
}
-int qcrypto_cipher_encrypt(QCryptoCipher *cipher,
- const void *in,
- void *out,
- size_t len,
- Error **errp)
+static int
+qcrypto_gcrypt_cipher_encrypt(QCryptoCipher *cipher,
+ const void *in,
+ void *out,
+ size_t len,
+ Error **errp)
{
QCryptoCipherGcrypt *ctx = cipher->opaque;
gcry_error_t err;
}
-int qcrypto_cipher_decrypt(QCryptoCipher *cipher,
- const void *in,
- void *out,
- size_t len,
- Error **errp)
+static int
+qcrypto_gcrypt_cipher_decrypt(QCryptoCipher *cipher,
+ const void *in,
+ void *out,
+ size_t len,
+ Error **errp)
{
QCryptoCipherGcrypt *ctx = cipher->opaque;
gcry_error_t err;
return 0;
}
-int qcrypto_cipher_setiv(QCryptoCipher *cipher,
- const uint8_t *iv, size_t niv,
- Error **errp)
+static int
+qcrypto_gcrypt_cipher_setiv(QCryptoCipher *cipher,
+ const uint8_t *iv, size_t niv,
+ Error **errp)
{
QCryptoCipherGcrypt *ctx = cipher->opaque;
gcry_error_t err;
if (ctx->iv) {
memcpy(ctx->iv, iv, niv);
} else {
- gcry_cipher_reset(ctx->handle);
- err = gcry_cipher_setiv(ctx->handle, iv, niv);
- if (err != 0) {
- error_setg(errp, "Cannot set IV: %s",
- gcry_strerror(err));
- return -1;
+ if (cipher->mode == QCRYPTO_CIPHER_MODE_CTR) {
+ err = gcry_cipher_setctr(ctx->handle, iv, niv);
+ if (err != 0) {
+ error_setg(errp, "Cannot set Counter: %s",
+ gcry_strerror(err));
+ return -1;
+ }
+ } else {
+ gcry_cipher_reset(ctx->handle);
+ err = gcry_cipher_setiv(ctx->handle, iv, niv);
+ if (err != 0) {
+ error_setg(errp, "Cannot set IV: %s",
+ gcry_strerror(err));
+ return -1;
+ }
}
}
return 0;
}
+
+
+static struct QCryptoCipherDriver qcrypto_cipher_lib_driver = {
+ .cipher_encrypt = qcrypto_gcrypt_cipher_encrypt,
+ .cipher_decrypt = qcrypto_gcrypt_cipher_decrypt,
+ .cipher_setiv = qcrypto_gcrypt_cipher_setiv,
+ .cipher_free = qcrypto_gcrypt_cipher_ctx_free,
+};
projects / qemu.git / blobdiff