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-rw-r--r--qemu/crypto/cipher-nettle.c330
1 files changed, 287 insertions, 43 deletions
diff --git a/qemu/crypto/cipher-nettle.c b/qemu/crypto/cipher-nettle.c
index b01cb1c85..70909fb7f 100644
--- a/qemu/crypto/cipher-nettle.c
+++ b/qemu/crypto/cipher-nettle.c
@@ -18,58 +18,177 @@
*
*/
+#include "qemu/osdep.h"
+#include "crypto/xts.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>
-#if CONFIG_NETTLE_VERSION_MAJOR < 3
-typedef nettle_crypt_func nettle_cipher_func;
+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
#else
+typedef nettle_cipher_func * QCryptoCipherNettleFuncNative;
typedef const void * cipher_ctx_t;
typedef size_t cipher_length_t;
#endif
-static nettle_cipher_func aes_encrypt_wrapper;
-static nettle_cipher_func aes_decrypt_wrapper;
-static nettle_cipher_func des_encrypt_wrapper;
-static nettle_cipher_func des_decrypt_wrapper;
+typedef struct QCryptoNettleAES {
+ struct aes_ctx enc;
+ struct aes_ctx dec;
+} QCryptoNettleAES;
+
+static void aes_encrypt_native(cipher_ctx_t ctx, cipher_length_t length,
+ uint8_t *dst, const uint8_t *src)
+{
+ const QCryptoNettleAES *aesctx = ctx;
+ aes_encrypt(&aesctx->enc, length, dst, src);
+}
+
+static void aes_decrypt_native(cipher_ctx_t ctx, cipher_length_t length,
+ uint8_t *dst, const uint8_t *src)
+{
+ const QCryptoNettleAES *aesctx = ctx;
+ aes_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 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 aes_encrypt_wrapper(cipher_ctx_t ctx, cipher_length_t length,
+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 aes_encrypt_wrapper(const void *ctx, size_t length,
uint8_t *dst, const uint8_t *src)
{
- aes_encrypt(ctx, length, dst, src);
+ const QCryptoNettleAES *aesctx = ctx;
+ aes_encrypt(&aesctx->enc, length, dst, src);
}
-static void aes_decrypt_wrapper(cipher_ctx_t ctx, cipher_length_t length,
+static void aes_decrypt_wrapper(const void *ctx, size_t length,
uint8_t *dst, const uint8_t *src)
{
- aes_decrypt(ctx, length, dst, src);
+ const QCryptoNettleAES *aesctx = ctx;
+ aes_decrypt(&aesctx->dec, length, dst, src);
}
-static void des_encrypt_wrapper(cipher_ctx_t ctx, cipher_length_t length,
+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(cipher_ctx_t ctx, cipher_length_t length,
+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 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 {
- void *ctx_encrypt;
- void *ctx_decrypt;
- nettle_cipher_func *alg_encrypt;
- nettle_cipher_func *alg_decrypt;
+ /* 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;
+
uint8_t *iv;
- size_t niv;
+ size_t blocksize;
};
bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg)
@@ -79,6 +198,13 @@ bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg)
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:
return true;
default:
return false;
@@ -98,13 +224,14 @@ 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;
}
@@ -116,38 +243,125 @@ QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg,
switch (alg) {
case QCRYPTO_CIPHER_ALG_DES_RFB:
- ctx->ctx_encrypt = g_new0(struct des_ctx, 1);
- ctx->ctx_decrypt = NULL; /* 1 ctx can do both */
+ ctx->ctx = g_new0(struct des_ctx, 1);
rfbkey = qcrypto_cipher_munge_des_rfb_key(key, nkey);
- des_set_key(ctx->ctx_encrypt, rfbkey);
+ des_set_key(ctx->ctx, rfbkey);
g_free(rfbkey);
- ctx->alg_encrypt = des_encrypt_wrapper;
- ctx->alg_decrypt = des_decrypt_wrapper;
+ 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->niv = DES_BLOCK_SIZE;
+ ctx->blocksize = DES_BLOCK_SIZE;
break;
case QCRYPTO_CIPHER_ALG_AES_128:
case QCRYPTO_CIPHER_ALG_AES_192:
case QCRYPTO_CIPHER_ALG_AES_256:
- ctx->ctx_encrypt = g_new0(struct aes_ctx, 1);
- ctx->ctx_decrypt = g_new0(struct aes_ctx, 1);
+ ctx->ctx = g_new0(QCryptoNettleAES, 1);
+
+ 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_native = aes_encrypt_native;
+ ctx->alg_decrypt_native = aes_decrypt_native;
+ ctx->alg_encrypt_wrapper = aes_encrypt_wrapper;
+ ctx->alg_decrypt_wrapper = aes_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);
- aes_set_encrypt_key(ctx->ctx_encrypt, nkey, key);
- aes_set_decrypt_key(ctx->ctx_decrypt, nkey, key);
+ 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 = aes_encrypt_wrapper;
- ctx->alg_decrypt = aes_decrypt_wrapper;
+ 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->niv = AES_BLOCK_SIZE;
+ 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 %d", alg);
goto error;
}
- ctx->iv = g_new0(uint8_t, ctx->niv);
+ ctx->iv = g_new0(uint8_t, ctx->blocksize);
cipher->opaque = ctx;
return cipher;
@@ -169,8 +383,8 @@ void qcrypto_cipher_free(QCryptoCipher *cipher)
ctx = cipher->opaque;
g_free(ctx->iv);
- g_free(ctx->ctx_encrypt);
- g_free(ctx->ctx_decrypt);
+ g_free(ctx->ctx);
+ g_free(ctx->ctx_tweak);
g_free(ctx);
g_free(cipher);
}
@@ -184,16 +398,29 @@ int qcrypto_cipher_encrypt(QCryptoCipher *cipher,
{
QCryptoCipherNettle *ctx = cipher->opaque;
+ if (len % ctx->blocksize) {
+ 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(ctx->ctx_encrypt, len, out, in);
+ ctx->alg_encrypt_wrapper(ctx->ctx, len, out, in);
break;
case QCRYPTO_CIPHER_MODE_CBC:
- cbc_encrypt(ctx->ctx_encrypt, ctx->alg_encrypt,
- ctx->niv, ctx->iv,
+ cbc_encrypt(ctx->ctx, ctx->alg_encrypt_native,
+ ctx->blocksize, ctx->iv,
len, out, in);
break;
+
+ case QCRYPTO_CIPHER_MODE_XTS:
+ xts_encrypt(ctx->ctx, ctx->ctx_tweak,
+ ctx->alg_encrypt_wrapper, ctx->alg_encrypt_wrapper,
+ ctx->iv, len, out, in);
+ break;
+
default:
error_setg(errp, "Unsupported cipher algorithm %d",
cipher->alg);
@@ -211,17 +438,34 @@ int qcrypto_cipher_decrypt(QCryptoCipher *cipher,
{
QCryptoCipherNettle *ctx = cipher->opaque;
+ if (len % ctx->blocksize) {
+ 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(ctx->ctx_decrypt ? ctx->ctx_decrypt : ctx->ctx_encrypt,
- len, out, in);
+ ctx->alg_decrypt_wrapper(ctx->ctx, len, out, in);
break;
case QCRYPTO_CIPHER_MODE_CBC:
- cbc_decrypt(ctx->ctx_decrypt ? ctx->ctx_decrypt : ctx->ctx_encrypt,
- ctx->alg_decrypt, ctx->niv, ctx->iv,
+ cbc_decrypt(ctx->ctx, ctx->alg_decrypt_native,
+ ctx->blocksize, ctx->iv,
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_wrapper, ctx->alg_decrypt_wrapper,
+ ctx->iv, len, out, in);
+ break;
+
default:
error_setg(errp, "Unsupported cipher algorithm %d",
cipher->alg);
@@ -235,9 +479,9 @@ int qcrypto_cipher_setiv(QCryptoCipher *cipher,
Error **errp)
{
QCryptoCipherNettle *ctx = cipher->opaque;
- if (niv != ctx->niv) {
+ if (niv != ctx->blocksize) {
error_setg(errp, "Expected IV size %zu not %zu",
- ctx->niv, niv);
+ ctx->blocksize, niv);
return -1;
}
memcpy(ctx->iv, iv, niv);