2 * QEMU Crypto cipher libgcrypt algorithms
4 * Copyright (c) 2015 Red Hat, Inc.
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
23 static int qcrypto_cipher_alg_to_gcry_alg(QCryptoCipherAlgorithm alg)
26 case QCRYPTO_CIPHER_ALG_DES:
27 return GCRY_CIPHER_DES;
28 case QCRYPTO_CIPHER_ALG_3DES:
29 return GCRY_CIPHER_3DES;
30 case QCRYPTO_CIPHER_ALG_AES_128:
31 return GCRY_CIPHER_AES128;
32 case QCRYPTO_CIPHER_ALG_AES_192:
33 return GCRY_CIPHER_AES192;
34 case QCRYPTO_CIPHER_ALG_AES_256:
35 return GCRY_CIPHER_AES256;
36 case QCRYPTO_CIPHER_ALG_CAST5_128:
37 return GCRY_CIPHER_CAST5;
38 case QCRYPTO_CIPHER_ALG_SERPENT_128:
39 return GCRY_CIPHER_SERPENT128;
40 case QCRYPTO_CIPHER_ALG_SERPENT_192:
41 return GCRY_CIPHER_SERPENT192;
42 case QCRYPTO_CIPHER_ALG_SERPENT_256:
43 return GCRY_CIPHER_SERPENT256;
44 case QCRYPTO_CIPHER_ALG_TWOFISH_128:
45 return GCRY_CIPHER_TWOFISH128;
46 case QCRYPTO_CIPHER_ALG_TWOFISH_256:
47 return GCRY_CIPHER_TWOFISH;
48 #ifdef CONFIG_CRYPTO_SM4
49 case QCRYPTO_CIPHER_ALG_SM4:
50 return GCRY_CIPHER_SM4;
53 return GCRY_CIPHER_NONE;
57 static int qcrypto_cipher_mode_to_gcry_mode(QCryptoCipherMode mode)
60 case QCRYPTO_CIPHER_MODE_ECB:
61 return GCRY_CIPHER_MODE_ECB;
62 case QCRYPTO_CIPHER_MODE_XTS:
63 return GCRY_CIPHER_MODE_XTS;
64 case QCRYPTO_CIPHER_MODE_CBC:
65 return GCRY_CIPHER_MODE_CBC;
66 case QCRYPTO_CIPHER_MODE_CTR:
67 return GCRY_CIPHER_MODE_CTR;
69 return GCRY_CIPHER_MODE_NONE;
73 bool qcrypto_cipher_supports(QCryptoCipherAlgorithm alg,
74 QCryptoCipherMode mode)
77 case QCRYPTO_CIPHER_ALG_DES:
78 case QCRYPTO_CIPHER_ALG_3DES:
79 case QCRYPTO_CIPHER_ALG_AES_128:
80 case QCRYPTO_CIPHER_ALG_AES_192:
81 case QCRYPTO_CIPHER_ALG_AES_256:
82 case QCRYPTO_CIPHER_ALG_CAST5_128:
83 case QCRYPTO_CIPHER_ALG_SERPENT_128:
84 case QCRYPTO_CIPHER_ALG_SERPENT_192:
85 case QCRYPTO_CIPHER_ALG_SERPENT_256:
86 case QCRYPTO_CIPHER_ALG_TWOFISH_128:
87 case QCRYPTO_CIPHER_ALG_TWOFISH_256:
88 #ifdef CONFIG_CRYPTO_SM4
89 case QCRYPTO_CIPHER_ALG_SM4:
96 if (gcry_cipher_algo_info(qcrypto_cipher_alg_to_gcry_alg(alg),
97 GCRYCTL_TEST_ALGO, NULL, NULL) != 0) {
102 case QCRYPTO_CIPHER_MODE_ECB:
103 case QCRYPTO_CIPHER_MODE_CBC:
104 case QCRYPTO_CIPHER_MODE_XTS:
105 case QCRYPTO_CIPHER_MODE_CTR:
112 typedef struct QCryptoCipherGcrypt {
114 gcry_cipher_hd_t handle;
116 } QCryptoCipherGcrypt;
119 static void qcrypto_gcrypt_ctx_free(QCryptoCipher *cipher)
121 QCryptoCipherGcrypt *ctx = container_of(cipher, QCryptoCipherGcrypt, base);
123 gcry_cipher_close(ctx->handle);
127 static int qcrypto_gcrypt_encrypt(QCryptoCipher *cipher, const void *in,
128 void *out, size_t len, Error **errp)
130 QCryptoCipherGcrypt *ctx = container_of(cipher, QCryptoCipherGcrypt, base);
133 if (len & (ctx->blocksize - 1)) {
134 error_setg(errp, "Length %zu must be a multiple of block size %zu",
135 len, ctx->blocksize);
139 err = gcry_cipher_encrypt(ctx->handle, out, len, in, len);
141 error_setg(errp, "Cannot encrypt data: %s", gcry_strerror(err));
149 static int qcrypto_gcrypt_decrypt(QCryptoCipher *cipher, const void *in,
150 void *out, size_t len, Error **errp)
152 QCryptoCipherGcrypt *ctx = container_of(cipher, QCryptoCipherGcrypt, base);
155 if (len & (ctx->blocksize - 1)) {
156 error_setg(errp, "Length %zu must be a multiple of block size %zu",
157 len, ctx->blocksize);
161 err = gcry_cipher_decrypt(ctx->handle, out, len, in, len);
163 error_setg(errp, "Cannot decrypt data: %s",
171 static int qcrypto_gcrypt_setiv(QCryptoCipher *cipher,
172 const uint8_t *iv, size_t niv,
175 QCryptoCipherGcrypt *ctx = container_of(cipher, QCryptoCipherGcrypt, base);
178 if (niv != ctx->blocksize) {
179 error_setg(errp, "Expected IV size %zu not %zu",
180 ctx->blocksize, niv);
184 gcry_cipher_reset(ctx->handle);
185 err = gcry_cipher_setiv(ctx->handle, iv, niv);
187 error_setg(errp, "Cannot set IV: %s", gcry_strerror(err));
194 static int qcrypto_gcrypt_ctr_setiv(QCryptoCipher *cipher,
195 const uint8_t *iv, size_t niv,
198 QCryptoCipherGcrypt *ctx = container_of(cipher, QCryptoCipherGcrypt, base);
201 if (niv != ctx->blocksize) {
202 error_setg(errp, "Expected IV size %zu not %zu",
203 ctx->blocksize, niv);
207 err = gcry_cipher_setctr(ctx->handle, iv, niv);
209 error_setg(errp, "Cannot set Counter: %s", gcry_strerror(err));
217 static const struct QCryptoCipherDriver qcrypto_gcrypt_driver = {
218 .cipher_encrypt = qcrypto_gcrypt_encrypt,
219 .cipher_decrypt = qcrypto_gcrypt_decrypt,
220 .cipher_setiv = qcrypto_gcrypt_setiv,
221 .cipher_free = qcrypto_gcrypt_ctx_free,
224 static const struct QCryptoCipherDriver qcrypto_gcrypt_ctr_driver = {
225 .cipher_encrypt = qcrypto_gcrypt_encrypt,
226 .cipher_decrypt = qcrypto_gcrypt_decrypt,
227 .cipher_setiv = qcrypto_gcrypt_ctr_setiv,
228 .cipher_free = qcrypto_gcrypt_ctx_free,
231 static QCryptoCipher *qcrypto_cipher_ctx_new(QCryptoCipherAlgorithm alg,
232 QCryptoCipherMode mode,
237 QCryptoCipherGcrypt *ctx;
238 const QCryptoCipherDriver *drv;
240 int gcryalg, gcrymode;
242 if (!qcrypto_cipher_validate_key_length(alg, mode, nkey, errp)) {
246 gcryalg = qcrypto_cipher_alg_to_gcry_alg(alg);
247 if (gcryalg == GCRY_CIPHER_NONE) {
248 error_setg(errp, "Unsupported cipher algorithm %s",
249 QCryptoCipherAlgorithm_str(alg));
253 gcrymode = qcrypto_cipher_mode_to_gcry_mode(mode);
254 if (gcrymode == GCRY_CIPHER_MODE_NONE) {
255 error_setg(errp, "Unsupported cipher mode %s",
256 QCryptoCipherMode_str(mode));
260 if (mode == QCRYPTO_CIPHER_MODE_CTR) {
261 drv = &qcrypto_gcrypt_ctr_driver;
263 drv = &qcrypto_gcrypt_driver;
266 ctx = g_new0(QCryptoCipherGcrypt, 1);
267 ctx->base.driver = drv;
269 err = gcry_cipher_open(&ctx->handle, gcryalg, gcrymode, 0);
271 error_setg(errp, "Cannot initialize cipher: %s",
275 ctx->blocksize = gcry_cipher_get_algo_blklen(gcryalg);
277 err = gcry_cipher_setkey(ctx->handle, key, nkey);
279 error_setg(errp, "Cannot set key: %s", gcry_strerror(err));
286 gcry_cipher_close(ctx->handle);