A new cipher algorithm 'cast-5-128' is defined for the Cast-5 algorithm with 128 bit key size. Smaller key sizes are supported by Cast-5, but nothing in QEMU should use them, so only 128 bit keys are permitted. The nettle and gcrypt cipher backends are updated to support the new cipher and a test vector added to the cipher test suite. The new algorithm is enabled in the LUKS block encryption driver. Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Fam Zheng <famz@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
285 lines
7.8 KiB
C
285 lines
7.8 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 <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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#if CONFIG_NETTLE_VERSION_MAJOR < 3
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typedef nettle_crypt_func nettle_cipher_func;
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typedef void * cipher_ctx_t;
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typedef unsigned cipher_length_t;
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#else
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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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static nettle_cipher_func aes_encrypt_wrapper;
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static nettle_cipher_func aes_decrypt_wrapper;
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static nettle_cipher_func des_encrypt_wrapper;
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static nettle_cipher_func des_decrypt_wrapper;
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static void aes_encrypt_wrapper(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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aes_encrypt(ctx, length, dst, src);
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}
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static void aes_decrypt_wrapper(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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aes_decrypt(ctx, length, dst, src);
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}
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static void des_encrypt_wrapper(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_wrapper(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 cast128_encrypt_wrapper(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_wrapper(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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typedef struct QCryptoCipherNettle QCryptoCipherNettle;
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struct QCryptoCipherNettle {
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void *ctx_encrypt;
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void *ctx_decrypt;
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nettle_cipher_func *alg_encrypt;
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nettle_cipher_func *alg_decrypt;
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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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{
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switch (alg) {
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case QCRYPTO_CIPHER_ALG_DES_RFB:
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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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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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QCryptoCipher *qcrypto_cipher_new(QCryptoCipherAlgorithm alg,
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QCryptoCipherMode mode,
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const uint8_t *key, size_t nkey,
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Error **errp)
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{
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QCryptoCipher *cipher;
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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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break;
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default:
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error_setg(errp, "Unsupported cipher mode %d", mode);
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return NULL;
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}
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if (!qcrypto_cipher_validate_key_length(alg, nkey, errp)) {
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return NULL;
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}
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cipher = g_new0(QCryptoCipher, 1);
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cipher->alg = alg;
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cipher->mode = mode;
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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_encrypt = g_new0(struct des_ctx, 1);
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ctx->ctx_decrypt = NULL; /* 1 ctx can do both */
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rfbkey = qcrypto_cipher_munge_des_rfb_key(key, nkey);
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des_set_key(ctx->ctx_encrypt, rfbkey);
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g_free(rfbkey);
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ctx->alg_encrypt = des_encrypt_wrapper;
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ctx->alg_decrypt = 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_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_encrypt = g_new0(struct aes_ctx, 1);
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ctx->ctx_decrypt = g_new0(struct aes_ctx, 1);
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aes_set_encrypt_key(ctx->ctx_encrypt, nkey, key);
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aes_set_decrypt_key(ctx->ctx_decrypt, nkey, key);
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ctx->alg_encrypt = aes_encrypt_wrapper;
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ctx->alg_decrypt = 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_encrypt = g_new0(struct cast128_ctx, 1);
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ctx->ctx_decrypt = NULL; /* 1 ctx can do both */
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cast5_set_key(ctx->ctx_encrypt, nkey, key);
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ctx->alg_encrypt = cast128_encrypt_wrapper;
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ctx->alg_decrypt = cast128_decrypt_wrapper;
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ctx->blocksize = CAST128_BLOCK_SIZE;
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break;
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default:
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error_setg(errp, "Unsupported cipher algorithm %d", alg);
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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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cipher->opaque = ctx;
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return cipher;
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error:
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g_free(cipher);
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g_free(ctx);
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return NULL;
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}
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void qcrypto_cipher_free(QCryptoCipher *cipher)
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{
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QCryptoCipherNettle *ctx;
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if (!cipher) {
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return;
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}
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ctx = cipher->opaque;
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g_free(ctx->iv);
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g_free(ctx->ctx_encrypt);
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g_free(ctx->ctx_decrypt);
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g_free(ctx);
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g_free(cipher);
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}
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int qcrypto_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(ctx->ctx_encrypt, 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_encrypt, ctx->alg_encrypt,
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ctx->blocksize, ctx->iv,
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len, out, in);
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break;
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default:
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error_setg(errp, "Unsupported cipher algorithm %d",
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cipher->alg);
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return -1;
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}
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return 0;
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}
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int qcrypto_cipher_decrypt(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_decrypt(ctx->ctx_decrypt ? ctx->ctx_decrypt : ctx->ctx_encrypt,
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len, out, in);
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break;
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case QCRYPTO_CIPHER_MODE_CBC:
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cbc_decrypt(ctx->ctx_decrypt ? ctx->ctx_decrypt : ctx->ctx_encrypt,
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ctx->alg_decrypt, ctx->blocksize, ctx->iv,
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len, out, in);
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break;
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default:
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error_setg(errp, "Unsupported cipher algorithm %d",
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cipher->alg);
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return -1;
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}
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return 0;
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}
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int qcrypto_cipher_setiv(QCryptoCipher *cipher,
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const uint8_t *iv, size_t niv,
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Error **errp)
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{
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QCryptoCipherNettle *ctx = cipher->opaque;
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if (niv != ctx->blocksize) {
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error_setg(errp, "Expected IV size %zu not %zu",
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ctx->blocksize, niv);
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return -1;
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}
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memcpy(ctx->iv, iv, niv);
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return 0;
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}
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