aboutsummaryrefslogtreecommitdiff
path: root/crypto
diff options
context:
space:
mode:
Diffstat (limited to 'crypto')
-rw-r--r--crypto/cipher-builtin.c85
-rw-r--r--crypto/cipher-gcrypt.c123
-rw-r--r--crypto/cipher-nettle.c79
-rw-r--r--crypto/cipher.c27
4 files changed, 270 insertions, 44 deletions
diff --git a/crypto/cipher-builtin.c b/crypto/cipher-builtin.c
index 836ed1a0a8..88963f65c8 100644
--- a/crypto/cipher-builtin.c
+++ b/crypto/cipher-builtin.c
@@ -21,6 +21,7 @@
#include "qemu/osdep.h"
#include "crypto/aes.h"
#include "crypto/desrfb.h"
+#include "crypto/xts.h"
typedef struct QCryptoCipherBuiltinAESContext QCryptoCipherBuiltinAESContext;
struct QCryptoCipherBuiltinAESContext {
@@ -30,6 +31,7 @@ struct QCryptoCipherBuiltinAESContext {
typedef struct QCryptoCipherBuiltinAES QCryptoCipherBuiltinAES;
struct QCryptoCipherBuiltinAES {
QCryptoCipherBuiltinAESContext key;
+ QCryptoCipherBuiltinAESContext key_tweak;
uint8_t iv[AES_BLOCK_SIZE];
};
typedef struct QCryptoCipherBuiltinDESRFB QCryptoCipherBuiltinDESRFB;
@@ -123,6 +125,30 @@ static void qcrypto_cipher_aes_ecb_decrypt(AES_KEY *key,
}
+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((AES_KEY *)&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((AES_KEY *)&aesctx->dec,
+ src, dst, length);
+}
+
+
static int qcrypto_cipher_encrypt_aes(QCryptoCipher *cipher,
const void *in,
void *out,
@@ -141,6 +167,14 @@ static int qcrypto_cipher_encrypt_aes(QCryptoCipher *cipher,
&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();
}
@@ -167,6 +201,14 @@ static int qcrypto_cipher_decrypt_aes(QCryptoCipher *cipher,
&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();
}
@@ -200,21 +242,46 @@ static int qcrypto_cipher_init_aes(QCryptoCipher *cipher,
QCryptoCipherBuiltin *ctxt;
if (cipher->mode != QCRYPTO_CIPHER_MODE_CBC &&
- cipher->mode != QCRYPTO_CIPHER_MODE_ECB) {
+ cipher->mode != QCRYPTO_CIPHER_MODE_ECB &&
+ cipher->mode != QCRYPTO_CIPHER_MODE_XTS) {
error_setg(errp, "Unsupported cipher mode %d", cipher->mode);
return -1;
}
ctxt = g_new0(QCryptoCipherBuiltin, 1);
- 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 (cipher->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 * 8, &ctxt->state.aes.key.dec) != 0) {
- error_setg(errp, "Failed to set decryption 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;
@@ -356,7 +423,7 @@ QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg,
cipher->alg = alg;
cipher->mode = mode;
- if (!qcrypto_cipher_validate_key_length(alg, nkey, errp)) {
+ if (!qcrypto_cipher_validate_key_length(alg, mode, nkey, errp)) {
goto error;
}
diff --git a/crypto/cipher-gcrypt.c b/crypto/cipher-gcrypt.c
index ce26456460..ede2f70df8 100644
--- a/crypto/cipher-gcrypt.c
+++ b/crypto/cipher-gcrypt.c
@@ -19,6 +19,8 @@
*/
#include "qemu/osdep.h"
+#include "crypto/xts.h"
+
#include <gcrypt.h>
@@ -44,7 +46,9 @@ bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg)
typedef struct QCryptoCipherGcrypt QCryptoCipherGcrypt;
struct QCryptoCipherGcrypt {
gcry_cipher_hd_t handle;
+ gcry_cipher_hd_t tweakhandle;
size_t blocksize;
+ uint8_t *iv;
};
QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg,
@@ -59,6 +63,7 @@ QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg,
switch (mode) {
case QCRYPTO_CIPHER_MODE_ECB:
+ case QCRYPTO_CIPHER_MODE_XTS:
gcrymode = GCRY_CIPHER_MODE_ECB;
break;
case QCRYPTO_CIPHER_MODE_CBC:
@@ -69,7 +74,7 @@ QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg,
return NULL;
}
- if (!qcrypto_cipher_validate_key_length(alg, nkey, errp)) {
+ if (!qcrypto_cipher_validate_key_length(alg, mode, nkey, errp)) {
return NULL;
}
@@ -131,6 +136,14 @@ QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg,
gcry_strerror(err));
goto error;
}
+ if (cipher->mode == QCRYPTO_CIPHER_MODE_XTS) {
+ err = gcry_cipher_open(&ctx->tweakhandle, gcryalg, gcrymode, 0);
+ if (err != 0) {
+ error_setg(errp, "Cannot initialize cipher: %s",
+ gcry_strerror(err));
+ goto error;
+ }
+ }
if (cipher->alg == QCRYPTO_CIPHER_ALG_DES_RFB) {
/* We're using standard DES cipher from gcrypt, so we need
@@ -142,7 +155,23 @@ QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg,
g_free(rfbkey);
ctx->blocksize = 8;
} else {
- err = gcry_cipher_setkey(ctx->handle, key, nkey);
+ if (cipher->mode == QCRYPTO_CIPHER_MODE_XTS) {
+ nkey /= 2;
+ err = gcry_cipher_setkey(ctx->handle, key, nkey);
+ if (err != 0) {
+ error_setg(errp, "Cannot set key: %s",
+ gcry_strerror(err));
+ goto error;
+ }
+ err = gcry_cipher_setkey(ctx->tweakhandle, key + nkey, nkey);
+ } else {
+ err = gcry_cipher_setkey(ctx->handle, key, nkey);
+ }
+ if (err != 0) {
+ error_setg(errp, "Cannot set key: %s",
+ gcry_strerror(err));
+ goto error;
+ }
switch (cipher->alg) {
case QCRYPTO_CIPHER_ALG_AES_128:
case QCRYPTO_CIPHER_ALG_AES_192:
@@ -161,10 +190,9 @@ QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg,
g_assert_not_reached();
}
}
- if (err != 0) {
- error_setg(errp, "Cannot set key: %s",
- gcry_strerror(err));
- goto error;
+
+ if (cipher->mode == QCRYPTO_CIPHER_MODE_XTS) {
+ ctx->iv = g_new0(uint8_t, ctx->blocksize);
}
cipher->opaque = ctx;
@@ -172,6 +200,9 @@ QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg,
error:
gcry_cipher_close(ctx->handle);
+ if (cipher->mode == QCRYPTO_CIPHER_MODE_XTS) {
+ gcry_cipher_close(ctx->tweakhandle);
+ }
g_free(ctx);
g_free(cipher);
return NULL;
@@ -186,11 +217,35 @@ void qcrypto_cipher_free(QCryptoCipher *cipher)
}
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);
}
+static void qcrypto_gcrypt_xts_encrypt(const void *ctx,
+ size_t length,
+ uint8_t *dst,
+ const uint8_t *src)
+{
+ gcry_error_t err;
+ err = gcry_cipher_encrypt((gcry_cipher_hd_t)ctx, dst, length, src, length);
+ g_assert(err == 0);
+}
+
+static void qcrypto_gcrypt_xts_decrypt(const void *ctx,
+ size_t length,
+ uint8_t *dst,
+ const uint8_t *src)
+{
+ gcry_error_t err;
+ err = gcry_cipher_decrypt((gcry_cipher_hd_t)ctx, dst, length, src, length);
+ g_assert(err == 0);
+}
+
int qcrypto_cipher_encrypt(QCryptoCipher *cipher,
const void *in,
void *out,
@@ -206,13 +261,20 @@ int qcrypto_cipher_encrypt(QCryptoCipher *cipher,
return -1;
}
- err = gcry_cipher_encrypt(ctx->handle,
- out, len,
- in, len);
- if (err != 0) {
- error_setg(errp, "Cannot encrypt data: %s",
- gcry_strerror(err));
- return -1;
+ if (cipher->mode == QCRYPTO_CIPHER_MODE_XTS) {
+ xts_encrypt(ctx->handle, ctx->tweakhandle,
+ qcrypto_gcrypt_xts_encrypt,
+ qcrypto_gcrypt_xts_decrypt,
+ ctx->iv, len, out, in);
+ } else {
+ err = gcry_cipher_encrypt(ctx->handle,
+ out, len,
+ in, len);
+ if (err != 0) {
+ error_setg(errp, "Cannot encrypt data: %s",
+ gcry_strerror(err));
+ return -1;
+ }
}
return 0;
@@ -234,13 +296,20 @@ int qcrypto_cipher_decrypt(QCryptoCipher *cipher,
return -1;
}
- err = gcry_cipher_decrypt(ctx->handle,
- out, len,
- in, len);
- if (err != 0) {
- error_setg(errp, "Cannot decrypt data: %s",
- gcry_strerror(err));
- return -1;
+ if (cipher->mode == QCRYPTO_CIPHER_MODE_XTS) {
+ xts_decrypt(ctx->handle, ctx->tweakhandle,
+ qcrypto_gcrypt_xts_encrypt,
+ qcrypto_gcrypt_xts_decrypt,
+ ctx->iv, len, out, in);
+ } else {
+ err = gcry_cipher_decrypt(ctx->handle,
+ out, len,
+ in, len);
+ if (err != 0) {
+ error_setg(errp, "Cannot decrypt data: %s",
+ gcry_strerror(err));
+ return -1;
+ }
}
return 0;
@@ -259,12 +328,16 @@ int qcrypto_cipher_setiv(QCryptoCipher *cipher,
return -1;
}
- gcry_cipher_reset(ctx->handle);
- err = gcry_cipher_setiv(ctx->handle, iv, niv);
- if (err != 0) {
- error_setg(errp, "Cannot set IV: %s",
+ 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;
+ return -1;
+ }
}
return 0;
diff --git a/crypto/cipher-nettle.c b/crypto/cipher-nettle.c
index ed08782c35..3c982e483a 100644
--- a/crypto/cipher-nettle.c
+++ b/crypto/cipher-nettle.c
@@ -19,6 +19,8 @@
*/
#include "qemu/osdep.h"
+#include "crypto/xts.h"
+
#include <nettle/nettle-types.h>
#include <nettle/aes.h>
#include <nettle/des.h>
@@ -111,9 +113,14 @@ static void twofish_decrypt_wrapper(cipher_ctx_t ctx, cipher_length_t length,
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 */
nettle_cipher_func *alg_encrypt;
nettle_cipher_func *alg_decrypt;
+
uint8_t *iv;
size_t blocksize;
};
@@ -151,13 +158,14 @@ QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg,
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 %d", mode);
return NULL;
}
- if (!qcrypto_cipher_validate_key_length(alg, nkey, errp)) {
+ if (!qcrypto_cipher_validate_key_length(alg, mode, nkey, errp)) {
return NULL;
}
@@ -185,8 +193,25 @@ QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg,
case QCRYPTO_CIPHER_ALG_AES_256:
ctx->ctx = g_new0(QCryptoNettleAES, 1);
- aes_set_encrypt_key(&((QCryptoNettleAES *)ctx->ctx)->enc, nkey, key);
- aes_set_decrypt_key(&((QCryptoNettleAES *)ctx->ctx)->dec, nkey, key);
+ if (mode == QCRYPTO_CIPHER_MODE_XTS) {
+ ctx->ctx_tweak = g_new0(QCryptoNettleAES, 1);
+
+ nkey /= 2;
+ aes_set_encrypt_key(&((QCryptoNettleAES *)ctx->ctx)->enc,
+ nkey, key);
+ aes_set_decrypt_key(&((QCryptoNettleAES *)ctx->ctx)->dec,
+ nkey, key);
+
+ aes_set_encrypt_key(&((QCryptoNettleAES *)ctx->ctx_tweak)->enc,
+ nkey, key + nkey);
+ aes_set_decrypt_key(&((QCryptoNettleAES *)ctx->ctx_tweak)->dec,
+ nkey, key + nkey);
+ } else {
+ aes_set_encrypt_key(&((QCryptoNettleAES *)ctx->ctx)->enc,
+ nkey, key);
+ aes_set_decrypt_key(&((QCryptoNettleAES *)ctx->ctx)->dec,
+ nkey, key);
+ }
ctx->alg_encrypt = aes_encrypt_wrapper;
ctx->alg_decrypt = aes_decrypt_wrapper;
@@ -197,7 +222,15 @@ QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg,
case QCRYPTO_CIPHER_ALG_CAST5_128:
ctx->ctx = g_new0(struct cast128_ctx, 1);
- cast5_set_key(ctx->ctx, nkey, key);
+ 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 = cast128_encrypt_wrapper;
ctx->alg_decrypt = cast128_decrypt_wrapper;
@@ -210,7 +243,15 @@ QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg,
case QCRYPTO_CIPHER_ALG_SERPENT_256:
ctx->ctx = g_new0(struct serpent_ctx, 1);
- serpent_set_key(ctx->ctx, nkey, key);
+ 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 = serpent_encrypt_wrapper;
ctx->alg_decrypt = serpent_decrypt_wrapper;
@@ -223,7 +264,15 @@ QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg,
case QCRYPTO_CIPHER_ALG_TWOFISH_256:
ctx->ctx = g_new0(struct twofish_ctx, 1);
- twofish_set_key(ctx->ctx, nkey, key);
+ 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 = twofish_encrypt_wrapper;
ctx->alg_decrypt = twofish_decrypt_wrapper;
@@ -259,6 +308,7 @@ void qcrypto_cipher_free(QCryptoCipher *cipher)
ctx = cipher->opaque;
g_free(ctx->iv);
g_free(ctx->ctx);
+ g_free(ctx->ctx_tweak);
g_free(ctx);
g_free(cipher);
}
@@ -289,6 +339,12 @@ int qcrypto_cipher_encrypt(QCryptoCipher *cipher,
len, out, in);
break;
+ case QCRYPTO_CIPHER_MODE_XTS:
+ xts_encrypt(ctx->ctx, ctx->ctx_tweak,
+ ctx->alg_encrypt, ctx->alg_encrypt,
+ ctx->iv, len, out, in);
+ break;
+
default:
error_setg(errp, "Unsupported cipher algorithm %d",
cipher->alg);
@@ -323,6 +379,17 @@ int qcrypto_cipher_decrypt(QCryptoCipher *cipher,
len, out, in);
break;
+ case QCRYPTO_CIPHER_MODE_XTS:
+ if (ctx->blocksize != XTS_BLOCK_SIZE) {
+ error_setg(errp, "Block size must be %d not %zu",
+ XTS_BLOCK_SIZE, ctx->blocksize);
+ return -1;
+ }
+ xts_decrypt(ctx->ctx, ctx->ctx_tweak,
+ ctx->alg_encrypt, ctx->alg_decrypt,
+ ctx->iv, len, out, in);
+ break;
+
default:
error_setg(errp, "Unsupported cipher algorithm %d",
cipher->alg);
diff --git a/crypto/cipher.c b/crypto/cipher.c
index 89fa5a2c70..5402d18525 100644
--- a/crypto/cipher.c
+++ b/crypto/cipher.c
@@ -53,6 +53,7 @@ static size_t alg_block_len[QCRYPTO_CIPHER_ALG__MAX] = {
static bool mode_need_iv[QCRYPTO_CIPHER_MODE__MAX] = {
[QCRYPTO_CIPHER_MODE_ECB] = false,
[QCRYPTO_CIPHER_MODE_CBC] = true,
+ [QCRYPTO_CIPHER_MODE_XTS] = true,
};
@@ -93,6 +94,7 @@ size_t qcrypto_cipher_get_iv_len(QCryptoCipherAlgorithm alg,
static bool
qcrypto_cipher_validate_key_length(QCryptoCipherAlgorithm alg,
+ QCryptoCipherMode mode,
size_t nkey,
Error **errp)
{
@@ -102,10 +104,27 @@ qcrypto_cipher_validate_key_length(QCryptoCipherAlgorithm alg,
return false;
}
- if (alg_key_len[alg] != nkey) {
- error_setg(errp, "Cipher key length %zu should be %zu",
- nkey, alg_key_len[alg]);
- return false;
+ if (mode == QCRYPTO_CIPHER_MODE_XTS) {
+ if (alg == QCRYPTO_CIPHER_ALG_DES_RFB) {
+ error_setg(errp, "XTS mode not compatible with DES-RFB");
+ return false;
+ }
+ if (nkey % 2) {
+ error_setg(errp, "XTS cipher key length should be a multiple of 2");
+ return false;
+ }
+
+ if (alg_key_len[alg] != (nkey / 2)) {
+ error_setg(errp, "Cipher key length %zu should be %zu",
+ nkey, alg_key_len[alg] * 2);
+ return false;
+ }
+ } else {
+ if (alg_key_len[alg] != nkey) {
+ error_setg(errp, "Cipher key length %zu should be %zu",
+ nkey, alg_key_len[alg]);
+ return false;
+ }
}
return true;
}
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-03 00:41:42 +0000