])
+AC_DEFUN([CONFIGURE_NETTLE], [
+ AC_CHECK_HEADERS(nettle/sha.h,,
+ [AC_MSG_ERROR('You need Nettle cryptographic library.')])
+
+ saved_LIBS=$LIBS
+ AC_CHECK_LIB(nettle, nettle_sha512_init,,
+ [AC_MSG_ERROR('You need Nettle library version 2.1 or more recent.')])
+ CRYPTO_LIBS=$LIBS
+ LIBS=$saved_LIBS
+
+ AC_MSG_WARN([Nettle backend does NOT provide backward compatibility (missing ripemd160 hash).])
+
+ CRYPTO_STATIC_LIBS=$CRYPTO_LIBS
+])
+
dnl ==========================================================================
saved_LIBS=$LIBS
dnl Crypto backend configuration.
AC_ARG_WITH([crypto_backend],
- AS_HELP_STRING([--with-crypto_backend=BACKEND], [crypto backend (gcrypt/openssl/nss/kernel) [gcrypt]]),
+ AS_HELP_STRING([--with-crypto_backend=BACKEND], [crypto backend (gcrypt/openssl/nss/kernel/nettle) [gcrypt]]),
[], with_crypto_backend=gcrypt
)
case $with_crypto_backend in
openssl) CONFIGURE_OPENSSL([]) ;;
nss) CONFIGURE_NSS([]) ;;
kernel) CONFIGURE_KERNEL([]) ;;
+ nettle) CONFIGURE_NETTLE([]) ;;
*) AC_MSG_ERROR([Unknown crypto backend.]) ;;
esac
AM_CONDITIONAL(CRYPTO_BACKEND_GCRYPT, test $with_crypto_backend = gcrypt)
AM_CONDITIONAL(CRYPTO_BACKEND_OPENSSL, test $with_crypto_backend = openssl)
AM_CONDITIONAL(CRYPTO_BACKEND_NSS, test $with_crypto_backend = nss)
AM_CONDITIONAL(CRYPTO_BACKEND_KERNEL, test $with_crypto_backend = kernel)
+AM_CONDITIONAL(CRYPTO_BACKEND_NETTLE, test $with_crypto_backend = nettle)
dnl Magic for cryptsetup.static build.
if test x$enable_static_cryptsetup = xyes; then
--- /dev/null
+/*
+ * Nettle crypto backend implementation
+ *
+ * Copyright (C) 2011 Red Hat, Inc. All rights reserved.
+ *
+ * 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 program 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <nettle/sha.h>
+#include <nettle/hmac.h>
+#include "crypto_backend.h"
+
+typedef void (*init_func) (void *);
+typedef void (*update_func) (void *, unsigned, const uint8_t *);
+typedef void (*digest_func) (void *, unsigned, uint8_t *);
+typedef void (*set_key_func) (void *, unsigned, const uint8_t *);
+
+struct hash_alg {
+ const char *name;
+ int length;
+ init_func init;
+ update_func update;
+ digest_func digest;
+ update_func hmac_update;
+ digest_func hmac_digest;
+ set_key_func hmac_set_key;
+};
+
+static struct hash_alg hash_algs[] = {
+ { "sha1", SHA1_DIGEST_SIZE,
+ (init_func) sha1_init,
+ (update_func) sha1_update,
+ (digest_func) sha1_digest,
+ (update_func) hmac_sha1_update,
+ (digest_func) hmac_sha1_digest,
+ (set_key_func) hmac_sha1_set_key,
+ },
+ { "sha224", SHA224_DIGEST_SIZE,
+ (init_func) sha224_init,
+ (update_func) sha224_update,
+ (digest_func) sha224_digest,
+ (update_func) hmac_sha224_update,
+ (digest_func) hmac_sha224_digest,
+ (set_key_func) hmac_sha224_set_key,
+ },
+ { "sha256", SHA256_DIGEST_SIZE,
+ (init_func) sha256_init,
+ (update_func) sha256_update,
+ (digest_func) sha256_digest,
+ (update_func) hmac_sha256_update,
+ (digest_func) hmac_sha256_digest,
+ (set_key_func) hmac_sha256_set_key,
+ },
+ { "sha384", SHA384_DIGEST_SIZE,
+ (init_func) sha384_init,
+ (update_func) sha384_update,
+ (digest_func) sha384_digest,
+ (update_func) hmac_sha384_update,
+ (digest_func) hmac_sha384_digest,
+ (set_key_func) hmac_sha384_set_key,
+ },
+ { "sha512", SHA512_DIGEST_SIZE,
+ (init_func) sha512_init,
+ (update_func) sha512_update,
+ (digest_func) sha512_digest,
+ (update_func) hmac_sha512_update,
+ (digest_func) hmac_sha512_digest,
+ (set_key_func) hmac_sha512_set_key,
+ },
+ { NULL, 0, NULL, NULL, NULL, NULL, NULL, NULL, }
+};
+
+struct crypt_hash {
+ const struct hash_alg *hash;
+ union {
+ struct sha1_ctx sha1;
+ struct sha224_ctx sha224;
+ struct sha256_ctx sha256;
+ struct sha384_ctx sha384;
+ struct sha512_ctx sha512;
+ } nettle_ctx;
+};
+
+struct crypt_hmac {
+ const struct hash_alg *hash;
+ union {
+ struct hmac_sha1_ctx sha1;
+ struct hmac_sha224_ctx sha224;
+ struct hmac_sha256_ctx sha256;
+ struct hmac_sha384_ctx sha384;
+ struct hmac_sha512_ctx sha512;
+ } nettle_ctx;
+ size_t key_length;
+ uint8_t *key;
+};
+
+uint32_t crypt_backend_flags(void)
+{
+ return 0;
+}
+
+static struct hash_alg *_get_alg(const char *name)
+{
+ int i = 0;
+
+ while (name && hash_algs[i].name) {
+ if (!strcmp(name, hash_algs[i].name))
+ return &hash_algs[i];
+ i++;
+ }
+ return NULL;
+}
+
+int crypt_backend_init(struct crypt_device *ctx)
+{
+ log_dbg("Initialising Nettle crypto backend.");
+ return 0;
+}
+
+/* HASH */
+int crypt_hash_size(const char *name)
+{
+ struct hash_alg *ha = _get_alg(name);
+
+ return ha ? ha->length : -EINVAL;
+}
+
+int crypt_hash_init(struct crypt_hash **ctx, const char *name)
+{
+ struct crypt_hash *h;
+
+ h = malloc(sizeof(*h));
+ if (!h)
+ return -ENOMEM;
+
+ h->hash = _get_alg(name);
+ if (!h->hash) {
+ free(h);
+ return -EINVAL;
+ }
+
+ h->hash->init(&h->nettle_ctx);
+
+ *ctx = h;
+ return 0;
+}
+
+int crypt_hash_restart(struct crypt_hash *ctx)
+{
+ ctx->hash->init(&ctx->nettle_ctx);
+ return 0;
+}
+
+int crypt_hash_write(struct crypt_hash *ctx, const char *buffer, size_t length)
+{
+ ctx->hash->update(&ctx->nettle_ctx, length, (const uint8_t*)buffer);
+ return 0;
+}
+
+int crypt_hash_final(struct crypt_hash *ctx, char *buffer, size_t length)
+{
+ if (length > (size_t)ctx->hash->length)
+ return -EINVAL;
+
+ ctx->hash->digest(&ctx->nettle_ctx, length, (uint8_t *)buffer);
+ return 0;
+}
+
+int crypt_hash_destroy(struct crypt_hash *ctx)
+{
+ memset(ctx, 0, sizeof(*ctx));
+ free(ctx);
+ return 0;
+}
+
+/* HMAC */
+int crypt_hmac_size(const char *name)
+{
+ return crypt_hash_size(name);
+}
+
+int crypt_hmac_init(struct crypt_hmac **ctx, const char *name,
+ const void *buffer, size_t length)
+{
+ struct crypt_hmac *h;
+
+ h = malloc(sizeof(*h));
+ if (!h)
+ return -ENOMEM;
+ memset(ctx, 0, sizeof(*ctx));
+
+
+ h->hash = _get_alg(name);
+ if (!h->hash)
+ goto bad;
+
+ h->key = malloc(length);
+ if (!h->key)
+ goto bad;
+
+ memcpy(h->key, buffer, length);
+ h->key_length = length;
+
+ h->hash->init(&h->nettle_ctx);
+ h->hash->hmac_set_key(&h->nettle_ctx, h->key_length, h->key);
+
+ *ctx = h;
+ return 0;
+bad:
+ free(h);
+ return -EINVAL;
+}
+
+int crypt_hmac_restart(struct crypt_hmac *ctx)
+{
+ ctx->hash->hmac_set_key(&ctx->nettle_ctx, ctx->key_length, ctx->key);
+ return 0;
+}
+
+int crypt_hmac_write(struct crypt_hmac *ctx, const char *buffer, size_t length)
+{
+ ctx->hash->hmac_update(&ctx->nettle_ctx, length, (const uint8_t *)buffer);
+ return 0;
+}
+
+int crypt_hmac_final(struct crypt_hmac *ctx, char *buffer, size_t length)
+{
+ if (length > (size_t)ctx->hash->length)
+ return -EINVAL;
+
+ ctx->hash->hmac_digest(&ctx->nettle_ctx, length, (uint8_t *)buffer);
+ return 0;
+}
+
+int crypt_hmac_destroy(struct crypt_hmac *ctx)
+{
+ memset(ctx->key, 0, ctx->key_length);
+ memset(ctx, 0, sizeof(*ctx));
+ free(ctx->key);
+ free(ctx);
+ return 0;
+}
projects / platform / upstream / cryptsetup.git / commitdiff