568 lines
17 KiB
C
568 lines
17 KiB
C
/*
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* QEMU Crypto cipher nettle algorithms
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*
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* Copyright (c) 2015 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "qemu/osdep.h"
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#include "crypto/xts.h"
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#include "cipherpriv.h"
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#include <nettle/nettle-types.h>
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#include <nettle/aes.h>
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#include <nettle/des.h>
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#include <nettle/cbc.h>
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#include <nettle/cast128.h>
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#include <nettle/serpent.h>
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#include <nettle/twofish.h>
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#include <nettle/ctr.h>
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typedef void (*QCryptoCipherNettleFuncWrapper)(const void *ctx,
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size_t length,
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uint8_t *dst,
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const uint8_t *src);
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#if CONFIG_NETTLE_VERSION_MAJOR < 3
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typedef nettle_crypt_func * QCryptoCipherNettleFuncNative;
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typedef void * cipher_ctx_t;
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typedef unsigned cipher_length_t;
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#define cast5_set_key cast128_set_key
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#else
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typedef nettle_cipher_func * QCryptoCipherNettleFuncNative;
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typedef const void * cipher_ctx_t;
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typedef size_t cipher_length_t;
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#endif
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typedef struct QCryptoNettleAES {
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struct aes_ctx enc;
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struct aes_ctx dec;
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} QCryptoNettleAES;
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static void aes_encrypt_native(cipher_ctx_t ctx, cipher_length_t length,
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uint8_t *dst, const uint8_t *src)
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{
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const QCryptoNettleAES *aesctx = ctx;
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aes_encrypt(&aesctx->enc, length, dst, src);
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}
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static void aes_decrypt_native(cipher_ctx_t ctx, cipher_length_t length,
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uint8_t *dst, const uint8_t *src)
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{
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const QCryptoNettleAES *aesctx = ctx;
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aes_decrypt(&aesctx->dec, length, dst, src);
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}
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static void des_encrypt_native(cipher_ctx_t ctx, cipher_length_t length,
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uint8_t *dst, const uint8_t *src)
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{
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des_encrypt(ctx, length, dst, src);
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}
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static void des_decrypt_native(cipher_ctx_t ctx, cipher_length_t length,
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uint8_t *dst, const uint8_t *src)
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{
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des_decrypt(ctx, length, dst, src);
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}
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static void des3_encrypt_native(cipher_ctx_t ctx, cipher_length_t length,
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uint8_t *dst, const uint8_t *src)
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{
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des3_encrypt(ctx, length, dst, src);
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}
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static void des3_decrypt_native(cipher_ctx_t ctx, cipher_length_t length,
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uint8_t *dst, const uint8_t *src)
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{
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des3_decrypt(ctx, length, dst, src);
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}
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static void cast128_encrypt_native(cipher_ctx_t ctx, cipher_length_t length,
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uint8_t *dst, const uint8_t *src)
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{
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cast128_encrypt(ctx, length, dst, src);
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}
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static void cast128_decrypt_native(cipher_ctx_t ctx, cipher_length_t length,
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uint8_t *dst, const uint8_t *src)
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{
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cast128_decrypt(ctx, length, dst, src);
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}
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static void serpent_encrypt_native(cipher_ctx_t ctx, cipher_length_t length,
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uint8_t *dst, const uint8_t *src)
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{
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serpent_encrypt(ctx, length, dst, src);
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}
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static void serpent_decrypt_native(cipher_ctx_t ctx, cipher_length_t length,
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uint8_t *dst, const uint8_t *src)
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{
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serpent_decrypt(ctx, length, dst, src);
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}
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static void twofish_encrypt_native(cipher_ctx_t ctx, cipher_length_t length,
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uint8_t *dst, const uint8_t *src)
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{
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twofish_encrypt(ctx, length, dst, src);
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}
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static void twofish_decrypt_native(cipher_ctx_t ctx, cipher_length_t length,
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uint8_t *dst, const uint8_t *src)
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{
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twofish_decrypt(ctx, length, dst, src);
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}
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static void aes_encrypt_wrapper(const void *ctx, size_t length,
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uint8_t *dst, const uint8_t *src)
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{
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const QCryptoNettleAES *aesctx = ctx;
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aes_encrypt(&aesctx->enc, length, dst, src);
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}
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static void aes_decrypt_wrapper(const void *ctx, size_t length,
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uint8_t *dst, const uint8_t *src)
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{
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const QCryptoNettleAES *aesctx = ctx;
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aes_decrypt(&aesctx->dec, length, dst, src);
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}
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static void des_encrypt_wrapper(const void *ctx, size_t length,
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uint8_t *dst, const uint8_t *src)
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{
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des_encrypt(ctx, length, dst, src);
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}
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static void des_decrypt_wrapper(const void *ctx, size_t length,
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uint8_t *dst, const uint8_t *src)
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{
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des_decrypt(ctx, length, dst, src);
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}
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static void des3_encrypt_wrapper(const void *ctx, size_t length,
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uint8_t *dst, const uint8_t *src)
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{
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des3_encrypt(ctx, length, dst, src);
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}
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static void des3_decrypt_wrapper(const void *ctx, size_t length,
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uint8_t *dst, const uint8_t *src)
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{
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des3_decrypt(ctx, length, dst, src);
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}
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static void cast128_encrypt_wrapper(const void *ctx, size_t length,
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uint8_t *dst, const uint8_t *src)
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{
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cast128_encrypt(ctx, length, dst, src);
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}
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static void cast128_decrypt_wrapper(const void *ctx, size_t length,
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uint8_t *dst, const uint8_t *src)
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{
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cast128_decrypt(ctx, length, dst, src);
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}
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static void serpent_encrypt_wrapper(const void *ctx, size_t length,
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uint8_t *dst, const uint8_t *src)
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{
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serpent_encrypt(ctx, length, dst, src);
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}
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static void serpent_decrypt_wrapper(const void *ctx, size_t length,
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uint8_t *dst, const uint8_t *src)
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{
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serpent_decrypt(ctx, length, dst, src);
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}
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static void twofish_encrypt_wrapper(const void *ctx, size_t length,
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uint8_t *dst, const uint8_t *src)
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{
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twofish_encrypt(ctx, length, dst, src);
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}
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static void twofish_decrypt_wrapper(const void *ctx, size_t length,
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uint8_t *dst, const uint8_t *src)
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{
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twofish_decrypt(ctx, length, dst, src);
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}
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typedef struct QCryptoCipherNettle QCryptoCipherNettle;
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struct QCryptoCipherNettle {
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/* Primary cipher context for all modes */
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void *ctx;
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/* Second cipher context for XTS mode only */
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void *ctx_tweak;
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/* Cipher callbacks for both contexts */
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QCryptoCipherNettleFuncNative alg_encrypt_native;
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QCryptoCipherNettleFuncNative alg_decrypt_native;
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QCryptoCipherNettleFuncWrapper alg_encrypt_wrapper;
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QCryptoCipherNettleFuncWrapper alg_decrypt_wrapper;
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/* Initialization vector or Counter */
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uint8_t *iv;
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size_t blocksize;
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};
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bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg,
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QCryptoCipherMode mode)
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{
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switch (alg) {
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case QCRYPTO_CIPHER_ALG_DES_RFB:
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case QCRYPTO_CIPHER_ALG_3DES:
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case QCRYPTO_CIPHER_ALG_AES_128:
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case QCRYPTO_CIPHER_ALG_AES_192:
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case QCRYPTO_CIPHER_ALG_AES_256:
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case QCRYPTO_CIPHER_ALG_CAST5_128:
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case QCRYPTO_CIPHER_ALG_SERPENT_128:
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case QCRYPTO_CIPHER_ALG_SERPENT_192:
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case QCRYPTO_CIPHER_ALG_SERPENT_256:
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case QCRYPTO_CIPHER_ALG_TWOFISH_128:
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case QCRYPTO_CIPHER_ALG_TWOFISH_192:
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case QCRYPTO_CIPHER_ALG_TWOFISH_256:
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break;
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default:
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return false;
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}
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switch (mode) {
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case QCRYPTO_CIPHER_MODE_ECB:
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case QCRYPTO_CIPHER_MODE_CBC:
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case QCRYPTO_CIPHER_MODE_XTS:
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case QCRYPTO_CIPHER_MODE_CTR:
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return true;
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default:
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return false;
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}
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}
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static void
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qcrypto_nettle_cipher_free_ctx(QCryptoCipherNettle *ctx)
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{
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if (!ctx) {
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return;
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}
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g_free(ctx->iv);
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g_free(ctx->ctx);
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g_free(ctx->ctx_tweak);
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g_free(ctx);
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}
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static QCryptoCipherNettle *qcrypto_cipher_ctx_new(QCryptoCipherAlgorithm alg,
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QCryptoCipherMode mode,
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const uint8_t *key,
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size_t nkey,
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Error **errp)
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{
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QCryptoCipherNettle *ctx;
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uint8_t *rfbkey;
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switch (mode) {
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case QCRYPTO_CIPHER_MODE_ECB:
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case QCRYPTO_CIPHER_MODE_CBC:
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case QCRYPTO_CIPHER_MODE_XTS:
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case QCRYPTO_CIPHER_MODE_CTR:
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break;
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default:
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error_setg(errp, "Unsupported cipher mode %s",
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QCryptoCipherMode_str(mode));
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return NULL;
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}
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if (!qcrypto_cipher_validate_key_length(alg, mode, nkey, errp)) {
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return NULL;
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}
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ctx = g_new0(QCryptoCipherNettle, 1);
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switch (alg) {
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case QCRYPTO_CIPHER_ALG_DES_RFB:
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ctx->ctx = g_new0(struct des_ctx, 1);
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rfbkey = qcrypto_cipher_munge_des_rfb_key(key, nkey);
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des_set_key(ctx->ctx, rfbkey);
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g_free(rfbkey);
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ctx->alg_encrypt_native = des_encrypt_native;
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ctx->alg_decrypt_native = des_decrypt_native;
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ctx->alg_encrypt_wrapper = des_encrypt_wrapper;
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ctx->alg_decrypt_wrapper = des_decrypt_wrapper;
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ctx->blocksize = DES_BLOCK_SIZE;
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break;
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case QCRYPTO_CIPHER_ALG_3DES:
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ctx->ctx = g_new0(struct des3_ctx, 1);
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des3_set_key(ctx->ctx, key);
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ctx->alg_encrypt_native = des3_encrypt_native;
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ctx->alg_decrypt_native = des3_decrypt_native;
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ctx->alg_encrypt_wrapper = des3_encrypt_wrapper;
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ctx->alg_decrypt_wrapper = des3_decrypt_wrapper;
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ctx->blocksize = DES3_BLOCK_SIZE;
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break;
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case QCRYPTO_CIPHER_ALG_AES_128:
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case QCRYPTO_CIPHER_ALG_AES_192:
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case QCRYPTO_CIPHER_ALG_AES_256:
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ctx->ctx = g_new0(QCryptoNettleAES, 1);
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if (mode == QCRYPTO_CIPHER_MODE_XTS) {
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ctx->ctx_tweak = g_new0(QCryptoNettleAES, 1);
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nkey /= 2;
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aes_set_encrypt_key(&((QCryptoNettleAES *)ctx->ctx)->enc,
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nkey, key);
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aes_set_decrypt_key(&((QCryptoNettleAES *)ctx->ctx)->dec,
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nkey, key);
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aes_set_encrypt_key(&((QCryptoNettleAES *)ctx->ctx_tweak)->enc,
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nkey, key + nkey);
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aes_set_decrypt_key(&((QCryptoNettleAES *)ctx->ctx_tweak)->dec,
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nkey, key + nkey);
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} else {
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aes_set_encrypt_key(&((QCryptoNettleAES *)ctx->ctx)->enc,
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nkey, key);
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aes_set_decrypt_key(&((QCryptoNettleAES *)ctx->ctx)->dec,
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nkey, key);
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}
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ctx->alg_encrypt_native = aes_encrypt_native;
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ctx->alg_decrypt_native = aes_decrypt_native;
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ctx->alg_encrypt_wrapper = aes_encrypt_wrapper;
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ctx->alg_decrypt_wrapper = aes_decrypt_wrapper;
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ctx->blocksize = AES_BLOCK_SIZE;
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break;
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case QCRYPTO_CIPHER_ALG_CAST5_128:
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ctx->ctx = g_new0(struct cast128_ctx, 1);
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if (mode == QCRYPTO_CIPHER_MODE_XTS) {
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ctx->ctx_tweak = g_new0(struct cast128_ctx, 1);
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nkey /= 2;
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cast5_set_key(ctx->ctx, nkey, key);
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cast5_set_key(ctx->ctx_tweak, nkey, key + nkey);
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} else {
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cast5_set_key(ctx->ctx, nkey, key);
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}
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ctx->alg_encrypt_native = cast128_encrypt_native;
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ctx->alg_decrypt_native = cast128_decrypt_native;
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ctx->alg_encrypt_wrapper = cast128_encrypt_wrapper;
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ctx->alg_decrypt_wrapper = cast128_decrypt_wrapper;
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ctx->blocksize = CAST128_BLOCK_SIZE;
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break;
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case QCRYPTO_CIPHER_ALG_SERPENT_128:
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case QCRYPTO_CIPHER_ALG_SERPENT_192:
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case QCRYPTO_CIPHER_ALG_SERPENT_256:
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ctx->ctx = g_new0(struct serpent_ctx, 1);
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if (mode == QCRYPTO_CIPHER_MODE_XTS) {
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ctx->ctx_tweak = g_new0(struct serpent_ctx, 1);
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nkey /= 2;
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serpent_set_key(ctx->ctx, nkey, key);
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serpent_set_key(ctx->ctx_tweak, nkey, key + nkey);
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} else {
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serpent_set_key(ctx->ctx, nkey, key);
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}
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ctx->alg_encrypt_native = serpent_encrypt_native;
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ctx->alg_decrypt_native = serpent_decrypt_native;
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ctx->alg_encrypt_wrapper = serpent_encrypt_wrapper;
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ctx->alg_decrypt_wrapper = serpent_decrypt_wrapper;
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ctx->blocksize = SERPENT_BLOCK_SIZE;
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break;
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case QCRYPTO_CIPHER_ALG_TWOFISH_128:
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case QCRYPTO_CIPHER_ALG_TWOFISH_192:
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case QCRYPTO_CIPHER_ALG_TWOFISH_256:
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ctx->ctx = g_new0(struct twofish_ctx, 1);
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if (mode == QCRYPTO_CIPHER_MODE_XTS) {
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ctx->ctx_tweak = g_new0(struct twofish_ctx, 1);
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nkey /= 2;
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twofish_set_key(ctx->ctx, nkey, key);
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twofish_set_key(ctx->ctx_tweak, nkey, key + nkey);
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} else {
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twofish_set_key(ctx->ctx, nkey, key);
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}
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ctx->alg_encrypt_native = twofish_encrypt_native;
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ctx->alg_decrypt_native = twofish_decrypt_native;
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ctx->alg_encrypt_wrapper = twofish_encrypt_wrapper;
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ctx->alg_decrypt_wrapper = twofish_decrypt_wrapper;
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ctx->blocksize = TWOFISH_BLOCK_SIZE;
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break;
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default:
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error_setg(errp, "Unsupported cipher algorithm %s",
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QCryptoCipherAlgorithm_str(alg));
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goto error;
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}
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if (mode == QCRYPTO_CIPHER_MODE_XTS &&
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ctx->blocksize != XTS_BLOCK_SIZE) {
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error_setg(errp, "Cipher block size %zu must equal XTS block size %d",
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ctx->blocksize, XTS_BLOCK_SIZE);
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goto error;
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}
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ctx->iv = g_new0(uint8_t, ctx->blocksize);
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return ctx;
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error:
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qcrypto_nettle_cipher_free_ctx(ctx);
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return NULL;
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}
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static void
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qcrypto_nettle_cipher_ctx_free(QCryptoCipher *cipher)
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{
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QCryptoCipherNettle *ctx;
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ctx = cipher->opaque;
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qcrypto_nettle_cipher_free_ctx(ctx);
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}
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static int
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qcrypto_nettle_cipher_encrypt(QCryptoCipher *cipher,
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const void *in,
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void *out,
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size_t len,
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Error **errp)
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{
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QCryptoCipherNettle *ctx = cipher->opaque;
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if (len % ctx->blocksize) {
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error_setg(errp, "Length %zu must be a multiple of block size %zu",
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len, ctx->blocksize);
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return -1;
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}
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switch (cipher->mode) {
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case QCRYPTO_CIPHER_MODE_ECB:
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ctx->alg_encrypt_wrapper(ctx->ctx, len, out, in);
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break;
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case QCRYPTO_CIPHER_MODE_CBC:
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cbc_encrypt(ctx->ctx, ctx->alg_encrypt_native,
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ctx->blocksize, ctx->iv,
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len, out, in);
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break;
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case QCRYPTO_CIPHER_MODE_XTS:
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xts_encrypt(ctx->ctx, ctx->ctx_tweak,
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ctx->alg_encrypt_wrapper, ctx->alg_encrypt_wrapper,
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ctx->iv, len, out, in);
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break;
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case QCRYPTO_CIPHER_MODE_CTR:
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ctr_crypt(ctx->ctx, ctx->alg_encrypt_native,
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ctx->blocksize, ctx->iv,
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len, out, in);
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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) {
|
|
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:
|
|
xts_decrypt(ctx->ctx, ctx->ctx_tweak,
|
|
ctx->alg_encrypt_wrapper, ctx->alg_decrypt_wrapper,
|
|
ctx->iv, len, out, in);
|
|
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,
|
|
};
|