/*
* OPENSSL crypto backend implementation
*
- * Copyright (C) 2010-2012, Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2010-2021 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2010-2021 Milan Broz
*
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * version 2 as published by the Free Software Foundation.
+ * This file is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This program is distributed in the hope that it will be useful,
+ * This file is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
*
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this file; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* In addition, as a special exception, the copyright holders give
* individual source file, and distribute linked combinations
* including the two.
*
- * You must obey the GNU General Public License in all respects
+ * You must obey the GNU Lesser General Public License in all respects
* for all of the code used other than OpenSSL.
*/
#include <openssl/evp.h>
#include <openssl/hmac.h>
#include <openssl/rand.h>
-#include "crypto_backend.h"
+#include "crypto_backend_internal.h"
+
+#define CONST_CAST(x) (x)(uintptr_t)
static int crypto_backend_initialised = 0;
struct crypt_hash {
- EVP_MD_CTX md;
+ EVP_MD_CTX *md;
const EVP_MD *hash_id;
int hash_len;
};
struct crypt_hmac {
- HMAC_CTX md;
+ HMAC_CTX *md;
const EVP_MD *hash_id;
int hash_len;
};
-int crypt_backend_init(struct crypt_device *ctx)
+struct crypt_cipher {
+ bool use_kernel;
+ union {
+ struct crypt_cipher_kernel kernel;
+ struct {
+ EVP_CIPHER_CTX *hd_enc;
+ EVP_CIPHER_CTX *hd_dec;
+ size_t iv_length;
+ } lib;
+ } u;
+};
+
+struct hash_alg {
+ const char *name;
+ const char *openssl_name;
+};
+
+/*
+ * Compatible wrappers for OpenSSL < 1.1.0 and LibreSSL < 2.7.0
+ */
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || \
+ (defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x2070000fL)
+
+static void openssl_backend_init(void)
+{
+ OpenSSL_add_all_algorithms();
+}
+
+static const char *openssl_backend_version(void)
+{
+ return SSLeay_version(SSLEAY_VERSION);
+}
+
+static EVP_MD_CTX *EVP_MD_CTX_new(void)
+{
+ EVP_MD_CTX *md = malloc(sizeof(*md));
+
+ if (md)
+ EVP_MD_CTX_init(md);
+
+ return md;
+}
+
+static void EVP_MD_CTX_free(EVP_MD_CTX *md)
+{
+ EVP_MD_CTX_cleanup(md);
+ free(md);
+}
+
+static HMAC_CTX *HMAC_CTX_new(void)
+{
+ HMAC_CTX *md = malloc(sizeof(*md));
+
+ if (md)
+ HMAC_CTX_init(md);
+
+ return md;
+}
+
+static void HMAC_CTX_free(HMAC_CTX *md)
+{
+ HMAC_CTX_cleanup(md);
+ free(md);
+}
+#else
+static void openssl_backend_init(void)
+{
+}
+
+static const char *openssl_backend_version(void)
+{
+ return OpenSSL_version(OPENSSL_VERSION);
+}
+#endif
+
+int crypt_backend_init(void)
{
if (crypto_backend_initialised)
return 0;
- OpenSSL_add_all_digests();
+ openssl_backend_init();
crypto_backend_initialised = 1;
return 0;
}
+void crypt_backend_destroy(void)
+{
+ crypto_backend_initialised = 0;
+}
+
uint32_t crypt_backend_flags(void)
{
return 0;
const char *crypt_backend_version(void)
{
- return SSLeay_version(SSLEAY_VERSION);
+ return openssl_backend_version();
+}
+
+static const char *crypt_hash_compat_name(const char *name)
+{
+ const char *hash_name = name;
+ int i;
+ static struct hash_alg hash_algs[] = {
+ { "blake2b-512", "blake2b512" },
+ { "blake2s-256", "blake2s256" },
+ { NULL, NULL, }};
+
+ if (!name)
+ return NULL;
+
+ i = 0;
+ while (hash_algs[i].name) {
+ if (!strcasecmp(name, hash_algs[i].name)) {
+ hash_name = hash_algs[i].openssl_name;
+ break;
+ }
+ i++;
+ }
+
+ return hash_name;
}
/* HASH */
int crypt_hash_size(const char *name)
{
- const EVP_MD *hash_id = EVP_get_digestbyname(name);
+ const EVP_MD *hash_id;
+ hash_id = EVP_get_digestbyname(crypt_hash_compat_name(name));
if (!hash_id)
return -EINVAL;
if (!h)
return -ENOMEM;
- h->hash_id = EVP_get_digestbyname(name);
+ h->md = EVP_MD_CTX_new();
+ if (!h->md) {
+ free(h);
+ return -ENOMEM;
+ }
+
+ h->hash_id = EVP_get_digestbyname(crypt_hash_compat_name(name));
if (!h->hash_id) {
+ EVP_MD_CTX_free(h->md);
free(h);
return -EINVAL;
}
- if (EVP_DigestInit(&h->md, h->hash_id) != 1) {
+ if (EVP_DigestInit_ex(h->md, h->hash_id, NULL) != 1) {
+ EVP_MD_CTX_free(h->md);
free(h);
return -EINVAL;
}
static int crypt_hash_restart(struct crypt_hash *ctx)
{
- if (EVP_DigestInit(&ctx->md, ctx->hash_id) != 1)
+ if (EVP_DigestInit_ex(ctx->md, ctx->hash_id, NULL) != 1)
return -EINVAL;
return 0;
int crypt_hash_write(struct crypt_hash *ctx, const char *buffer, size_t length)
{
- if (EVP_DigestUpdate(&ctx->md, buffer, length) != 1)
+ if (EVP_DigestUpdate(ctx->md, buffer, length) != 1)
return -EINVAL;
return 0;
if (length > (size_t)ctx->hash_len)
return -EINVAL;
- if (EVP_DigestFinal_ex(&ctx->md, tmp, &tmp_len) != 1)
+ if (EVP_DigestFinal_ex(ctx->md, tmp, &tmp_len) != 1)
return -EINVAL;
memcpy(buffer, tmp, length);
- memset(tmp, 0, sizeof(tmp));
+ crypt_backend_memzero(tmp, sizeof(tmp));
if (tmp_len < length)
return -EINVAL;
return 0;
}
-int crypt_hash_destroy(struct crypt_hash *ctx)
+void crypt_hash_destroy(struct crypt_hash *ctx)
{
- EVP_MD_CTX_cleanup(&ctx->md);
+ EVP_MD_CTX_free(ctx->md);
memset(ctx, 0, sizeof(*ctx));
free(ctx);
- return 0;
}
/* HMAC */
}
int crypt_hmac_init(struct crypt_hmac **ctx, const char *name,
- const void *buffer, size_t length)
+ const void *key, size_t key_length)
{
struct crypt_hmac *h;
if (!h)
return -ENOMEM;
- h->hash_id = EVP_get_digestbyname(name);
+ h->md = HMAC_CTX_new();
+ if (!h->md) {
+ free(h);
+ return -ENOMEM;
+ }
+
+ h->hash_id = EVP_get_digestbyname(crypt_hash_compat_name(name));
if (!h->hash_id) {
+ HMAC_CTX_free(h->md);
free(h);
return -EINVAL;
}
- HMAC_CTX_init(&h->md);
- HMAC_Init_ex(&h->md, buffer, length, h->hash_id, NULL);
+ HMAC_Init_ex(h->md, key, key_length, h->hash_id, NULL);
h->hash_len = EVP_MD_size(h->hash_id);
*ctx = h;
static void crypt_hmac_restart(struct crypt_hmac *ctx)
{
- HMAC_Init_ex(&ctx->md, NULL, 0, ctx->hash_id, NULL);
+ HMAC_Init_ex(ctx->md, NULL, 0, ctx->hash_id, NULL);
}
int crypt_hmac_write(struct crypt_hmac *ctx, const char *buffer, size_t length)
{
- HMAC_Update(&ctx->md, (const unsigned char *)buffer, length);
+ HMAC_Update(ctx->md, (const unsigned char *)buffer, length);
return 0;
}
if (length > (size_t)ctx->hash_len)
return -EINVAL;
- HMAC_Final(&ctx->md, tmp, &tmp_len);
+ HMAC_Final(ctx->md, tmp, &tmp_len);
memcpy(buffer, tmp, length);
- memset(tmp, 0, sizeof(tmp));
+ crypt_backend_memzero(tmp, sizeof(tmp));
if (tmp_len < length)
return -EINVAL;
return 0;
}
-int crypt_hmac_destroy(struct crypt_hmac *ctx)
+void crypt_hmac_destroy(struct crypt_hmac *ctx)
{
- HMAC_CTX_cleanup(&ctx->md);
+ HMAC_CTX_free(ctx->md);
memset(ctx, 0, sizeof(*ctx));
free(ctx);
- return 0;
}
/* RNG */
int crypt_backend_rng(char *buffer, size_t length, int quality, int fips)
{
- if (fips)
+ if (RAND_bytes((unsigned char *)buffer, length) != 1)
return -EINVAL;
- if (RAND_bytes((unsigned char *)buffer, length) != 1)
+ return 0;
+}
+
+/* PBKDF */
+int crypt_pbkdf(const char *kdf, const char *hash,
+ const char *password, size_t password_length,
+ const char *salt, size_t salt_length,
+ char *key, size_t key_length,
+ uint32_t iterations, uint32_t memory, uint32_t parallel)
+
+{
+ const EVP_MD *hash_id;
+
+ if (!kdf)
+ return -EINVAL;
+
+ if (!strcmp(kdf, "pbkdf2")) {
+ hash_id = EVP_get_digestbyname(crypt_hash_compat_name(hash));
+ if (!hash_id)
+ return -EINVAL;
+
+ if (!PKCS5_PBKDF2_HMAC(password, (int)password_length,
+ (const unsigned char *)salt, (int)salt_length,
+ (int)iterations, hash_id, (int)key_length, (unsigned char *)key))
+ return -EINVAL;
+ return 0;
+ } else if (!strncmp(kdf, "argon2", 6)) {
+ return argon2(kdf, password, password_length, salt, salt_length,
+ key, key_length, iterations, memory, parallel);
+ }
+
+ return -EINVAL;
+}
+
+/* Block ciphers */
+static void _cipher_destroy(EVP_CIPHER_CTX **hd_enc, EVP_CIPHER_CTX **hd_dec)
+{
+ EVP_CIPHER_CTX_free(*hd_enc);
+ *hd_enc = NULL;
+
+ EVP_CIPHER_CTX_free(*hd_dec);
+ *hd_dec = NULL;
+}
+
+static int _cipher_init(EVP_CIPHER_CTX **hd_enc, EVP_CIPHER_CTX **hd_dec, const char *name,
+ const char *mode, const void *key, size_t key_length, size_t *iv_length)
+{
+ char cipher_name[256];
+ const EVP_CIPHER *type;
+ int r, key_bits;
+
+ key_bits = key_length * 8;
+ if (!strcmp(mode, "xts"))
+ key_bits /= 2;
+
+ r = snprintf(cipher_name, sizeof(cipher_name), "%s-%d-%s", name, key_bits, mode);
+ if (r < 0 || (size_t)r >= sizeof(cipher_name))
return -EINVAL;
+ type = EVP_get_cipherbyname(cipher_name);
+ if (!type)
+ return -ENOENT;
+
+ if (EVP_CIPHER_key_length(type) != (int)key_length)
+ return -EINVAL;
+
+ *hd_enc = EVP_CIPHER_CTX_new();
+ *hd_dec = EVP_CIPHER_CTX_new();
+ *iv_length = EVP_CIPHER_iv_length(type);
+
+ if (!*hd_enc || !*hd_dec)
+ return -EINVAL;
+
+ if (EVP_EncryptInit_ex(*hd_enc, type, NULL, key, NULL) != 1 ||
+ EVP_DecryptInit_ex(*hd_dec, type, NULL, key, NULL) != 1) {
+ _cipher_destroy(hd_enc, hd_dec);
+ return -EINVAL;
+ }
+
+ if (EVP_CIPHER_CTX_set_padding(*hd_enc, 0) != 1 ||
+ EVP_CIPHER_CTX_set_padding(*hd_dec, 0) != 1) {
+ _cipher_destroy(hd_enc, hd_dec);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+int crypt_cipher_init(struct crypt_cipher **ctx, const char *name,
+ const char *mode, const void *key, size_t key_length)
+{
+ struct crypt_cipher *h;
+ int r;
+
+ h = malloc(sizeof(*h));
+ if (!h)
+ return -ENOMEM;
+
+ if (!_cipher_init(&h->u.lib.hd_enc, &h->u.lib.hd_dec, name, mode, key,
+ key_length, &h->u.lib.iv_length)) {
+ h->use_kernel = false;
+ *ctx = h;
+ return 0;
+ }
+
+ r = crypt_cipher_init_kernel(&h->u.kernel, name, mode, key, key_length);
+ if (r < 0) {
+ free(h);
+ return r;
+ }
+
+ h->use_kernel = true;
+ *ctx = h;
return 0;
}
+
+void crypt_cipher_destroy(struct crypt_cipher *ctx)
+{
+ if (ctx->use_kernel)
+ crypt_cipher_destroy_kernel(&ctx->u.kernel);
+ else
+ _cipher_destroy(&ctx->u.lib.hd_enc, &ctx->u.lib.hd_dec);
+ free(ctx);
+}
+
+static int _cipher_encrypt(struct crypt_cipher *ctx, const unsigned char *in, unsigned char *out,
+ int length, const unsigned char *iv, size_t iv_length)
+{
+ int len;
+
+ if (ctx->u.lib.iv_length != iv_length)
+ return -EINVAL;
+
+ if (EVP_EncryptInit_ex(ctx->u.lib.hd_enc, NULL, NULL, NULL, iv) != 1)
+ return -EINVAL;
+
+ if (EVP_EncryptUpdate(ctx->u.lib.hd_enc, out, &len, in, length) != 1)
+ return -EINVAL;
+
+ if (EVP_EncryptFinal(ctx->u.lib.hd_enc, out + len, &len) != 1)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int _cipher_decrypt(struct crypt_cipher *ctx, const unsigned char *in, unsigned char *out,
+ int length, const unsigned char *iv, size_t iv_length)
+{
+ int len;
+
+ if (ctx->u.lib.iv_length != iv_length)
+ return -EINVAL;
+
+ if (EVP_DecryptInit_ex(ctx->u.lib.hd_dec, NULL, NULL, NULL, iv) != 1)
+ return -EINVAL;
+
+ if (EVP_DecryptUpdate(ctx->u.lib.hd_dec, out, &len, in, length) != 1)
+ return -EINVAL;
+
+ if (EVP_DecryptFinal(ctx->u.lib.hd_dec, out + len, &len) != 1)
+ return -EINVAL;
+
+ return 0;
+}
+
+int crypt_cipher_encrypt(struct crypt_cipher *ctx,
+ const char *in, char *out, size_t length,
+ const char *iv, size_t iv_length)
+{
+ if (ctx->use_kernel)
+ return crypt_cipher_encrypt_kernel(&ctx->u.kernel, in, out, length, iv, iv_length);
+
+ return _cipher_encrypt(ctx, (const unsigned char*)in,
+ (unsigned char *)out, length, (const unsigned char*)iv, iv_length);
+}
+
+int crypt_cipher_decrypt(struct crypt_cipher *ctx,
+ const char *in, char *out, size_t length,
+ const char *iv, size_t iv_length)
+{
+ if (ctx->use_kernel)
+ return crypt_cipher_decrypt_kernel(&ctx->u.kernel, in, out, length, iv, iv_length);
+
+ return _cipher_decrypt(ctx, (const unsigned char*)in,
+ (unsigned char *)out, length, (const unsigned char*)iv, iv_length);
+}
+
+bool crypt_cipher_kernel_only(struct crypt_cipher *ctx)
+{
+ return ctx->use_kernel;
+}
+
+int crypt_bitlk_decrypt_key(const void *key, size_t key_length,
+ const char *in, char *out, size_t length,
+ const char *iv, size_t iv_length,
+ const char *tag, size_t tag_length)
+{
+#ifdef EVP_CTRL_CCM_SET_IVLEN
+ EVP_CIPHER_CTX *ctx;
+ int len = 0, r = -EINVAL;
+
+ ctx = EVP_CIPHER_CTX_new();
+ if (!ctx)
+ return -EINVAL;
+
+ if (EVP_DecryptInit_ex(ctx, EVP_aes_256_ccm(), NULL, NULL, NULL) != 1)
+ goto out;
+
+ //EVP_CIPHER_CTX_key_length(ctx)
+ //EVP_CIPHER_CTX_iv_length(ctx)
+
+ if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_CCM_SET_IVLEN, iv_length, NULL) != 1)
+ goto out;
+ if (EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_CCM_SET_TAG, tag_length, CONST_CAST(void*)tag) != 1)
+ goto out;
+
+ if (EVP_DecryptInit_ex(ctx, NULL, NULL, key, (const unsigned char*)iv) != 1)
+ goto out;
+
+ if (EVP_DecryptUpdate(ctx, (unsigned char*)out, &len, (const unsigned char*)in, length) == 1)
+ r = 0;
+out:
+ EVP_CIPHER_CTX_free(ctx);
+ return r;
+#else
+ return -ENOTSUP;
+#endif
+}
projects / platform / upstream / cryptsetup.git / blobdiff