273 lines
7.8 KiB
PHP
273 lines
7.8 KiB
PHP
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/*
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* QEMU Crypto cipher libgcrypt 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 2.1 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 <gcrypt.h>
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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:
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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_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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typedef struct QCryptoCipherGcrypt {
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QCryptoCipher base;
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gcry_cipher_hd_t handle;
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size_t blocksize;
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} QCryptoCipherGcrypt;
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static void qcrypto_gcrypt_ctx_free(QCryptoCipher *cipher)
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{
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QCryptoCipherGcrypt *ctx = container_of(cipher, QCryptoCipherGcrypt, base);
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gcry_cipher_close(ctx->handle);
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g_free(ctx);
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}
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static int qcrypto_gcrypt_encrypt(QCryptoCipher *cipher, const void *in,
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void *out, size_t len, Error **errp)
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{
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QCryptoCipherGcrypt *ctx = container_of(cipher, QCryptoCipherGcrypt, base);
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gcry_error_t err;
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if (len & (ctx->blocksize - 1)) {
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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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err = gcry_cipher_encrypt(ctx->handle, out, len, in, len);
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if (err != 0) {
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error_setg(errp, "Cannot encrypt data: %s", gcry_strerror(err));
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return -1;
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}
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return 0;
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}
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static int qcrypto_gcrypt_decrypt(QCryptoCipher *cipher, const void *in,
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void *out, size_t len, Error **errp)
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{
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QCryptoCipherGcrypt *ctx = container_of(cipher, QCryptoCipherGcrypt, base);
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gcry_error_t err;
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if (len & (ctx->blocksize - 1)) {
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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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err = gcry_cipher_decrypt(ctx->handle, out, len, in, len);
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if (err != 0) {
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error_setg(errp, "Cannot decrypt data: %s",
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gcry_strerror(err));
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return -1;
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}
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return 0;
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}
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static int qcrypto_gcrypt_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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QCryptoCipherGcrypt *ctx = container_of(cipher, QCryptoCipherGcrypt, base);
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gcry_error_t err;
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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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gcry_cipher_reset(ctx->handle);
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err = gcry_cipher_setiv(ctx->handle, iv, niv);
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if (err != 0) {
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error_setg(errp, "Cannot set IV: %s", gcry_strerror(err));
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return -1;
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}
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return 0;
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}
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static int qcrypto_gcrypt_ctr_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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QCryptoCipherGcrypt *ctx = container_of(cipher, QCryptoCipherGcrypt, base);
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gcry_error_t err;
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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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err = gcry_cipher_setctr(ctx->handle, iv, niv);
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if (err != 0) {
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error_setg(errp, "Cannot set Counter: %s", gcry_strerror(err));
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return -1;
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}
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return 0;
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}
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static const struct QCryptoCipherDriver qcrypto_gcrypt_driver = {
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.cipher_encrypt = qcrypto_gcrypt_encrypt,
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.cipher_decrypt = qcrypto_gcrypt_decrypt,
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.cipher_setiv = qcrypto_gcrypt_setiv,
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.cipher_free = qcrypto_gcrypt_ctx_free,
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};
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static const struct QCryptoCipherDriver qcrypto_gcrypt_ctr_driver = {
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.cipher_encrypt = qcrypto_gcrypt_encrypt,
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.cipher_decrypt = qcrypto_gcrypt_decrypt,
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.cipher_setiv = qcrypto_gcrypt_ctr_setiv,
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.cipher_free = qcrypto_gcrypt_ctx_free,
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};
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static QCryptoCipher *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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QCryptoCipherGcrypt *ctx;
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const QCryptoCipherDriver *drv;
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gcry_error_t err;
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int gcryalg, gcrymode;
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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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switch (alg) {
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case QCRYPTO_CIPHER_ALG_DES:
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gcryalg = GCRY_CIPHER_DES;
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break;
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case QCRYPTO_CIPHER_ALG_3DES:
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gcryalg = GCRY_CIPHER_3DES;
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break;
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case QCRYPTO_CIPHER_ALG_AES_128:
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gcryalg = GCRY_CIPHER_AES128;
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break;
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case QCRYPTO_CIPHER_ALG_AES_192:
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gcryalg = GCRY_CIPHER_AES192;
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break;
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case QCRYPTO_CIPHER_ALG_AES_256:
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gcryalg = GCRY_CIPHER_AES256;
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break;
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case QCRYPTO_CIPHER_ALG_CAST5_128:
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gcryalg = GCRY_CIPHER_CAST5;
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break;
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case QCRYPTO_CIPHER_ALG_SERPENT_128:
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gcryalg = GCRY_CIPHER_SERPENT128;
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break;
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case QCRYPTO_CIPHER_ALG_SERPENT_192:
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gcryalg = GCRY_CIPHER_SERPENT192;
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break;
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case QCRYPTO_CIPHER_ALG_SERPENT_256:
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gcryalg = GCRY_CIPHER_SERPENT256;
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break;
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case QCRYPTO_CIPHER_ALG_TWOFISH_128:
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gcryalg = GCRY_CIPHER_TWOFISH128;
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break;
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case QCRYPTO_CIPHER_ALG_TWOFISH_256:
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gcryalg = GCRY_CIPHER_TWOFISH;
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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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return NULL;
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}
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drv = &qcrypto_gcrypt_driver;
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switch (mode) {
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case QCRYPTO_CIPHER_MODE_ECB:
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gcrymode = GCRY_CIPHER_MODE_ECB;
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break;
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case QCRYPTO_CIPHER_MODE_XTS:
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gcrymode = GCRY_CIPHER_MODE_XTS;
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break;
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case QCRYPTO_CIPHER_MODE_CBC:
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gcrymode = GCRY_CIPHER_MODE_CBC;
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break;
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case QCRYPTO_CIPHER_MODE_CTR:
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drv = &qcrypto_gcrypt_ctr_driver;
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gcrymode = GCRY_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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ctx = g_new0(QCryptoCipherGcrypt, 1);
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ctx->base.driver = drv;
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err = gcry_cipher_open(&ctx->handle, gcryalg, gcrymode, 0);
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if (err != 0) {
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error_setg(errp, "Cannot initialize cipher: %s",
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gcry_strerror(err));
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goto error;
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}
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ctx->blocksize = gcry_cipher_get_algo_blklen(gcryalg);
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err = gcry_cipher_setkey(ctx->handle, key, nkey);
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if (err != 0) {
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error_setg(errp, "Cannot set key: %s", gcry_strerror(err));
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goto error;
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}
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return &ctx->base;
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error:
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gcry_cipher_close(ctx->handle);
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g_free(ctx);
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return NULL;
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}
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