Move cryptographic functions into archive_cryptor.c.

I will rename archive_crypto.c to archive_digest.c.

1 files changed, 106 insertions, 0 deletions

diff --git a/libarchive/archive_cryptor_private.h b/libarchive/archive_cryptor_private.h
new file mode 100644
index 00000000..4278bc38
--- /dev/null
+++ b/libarchive/archive_cryptor_private.h
@@ -0,0 +1,106 @@
+/*-
+* Copyright (c) 2014 Michihiro NAKAJIMA
+* All rights reserved.
+*
+* Redistribution and use in source and binary forms, with or without
+* modification, are permitted provided that the following conditions
+* are met:
+* 1. Redistributions of source code must retain the above copyright
+*    notice, this list of conditions and the following disclaimer.
+* 2. Redistributions in binary form must reproduce the above copyright
+*    notice, this list of conditions and the following disclaimer in the
+*    documentation and/or other materials provided with the distribution.
+*
+* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
+* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
+* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#ifndef __LIBARCHIVE_BUILD
+#error This header is only to be used internally to libarchive.
+#endif
+
+#ifndef ARCHIVE_CRYPTOR_PRIVATE_H_INCLUDED
+#define ARCHIVE_CRYPTOR_PRIVATE_H_INCLUDED
+
+#ifdef __APPLE__
+#include <CommonCrypto/CommonCryptor.h>
+#include <CommonCrypto/CommonKeyDerivation.h>
+#define AES_BLOCK_SIZE	16
+#define AES_MAX_KEY_SIZE kCCKeySizeAES256
+
+typedef struct {
+	CCCryptorRef	ctx;
+	uint8_t		key[AES_MAX_KEY_SIZE];
+	unsigned	key_len;
+	uint8_t		nonce[AES_BLOCK_SIZE];
+	uint8_t		encr_buf[AES_BLOCK_SIZE];
+	unsigned	encr_pos;
+} archive_crypto_ctx;
+
+#elif defined(HAVE_LIBNETTLE)
+#include <nettle/pbkdf2.h>
+#include <nettle/aes.h>
+
+typedef struct {
+	struct aes_ctx	ctx;
+	uint8_t		key[AES_MAX_KEY_SIZE];
+	unsigned	key_len;
+	uint8_t		nonce[AES_BLOCK_SIZE];
+	uint8_t		encr_buf[AES_BLOCK_SIZE];
+	unsigned	encr_pos;
+} archive_crypto_ctx;
+
+#elif defined(HAVE_LIBCRYPTO)
+#include <openssl/evp.h>
+#define AES_BLOCK_SIZE	16
+#define AES_MAX_KEY_SIZE 32
+
+typedef struct {
+	EVP_CIPHER_CTX	ctx;
+	const EVP_CIPHER *type;
+	uint8_t		key[AES_MAX_KEY_SIZE];
+	unsigned	key_len;
+	uint8_t		nonce[AES_BLOCK_SIZE];
+	uint8_t		encr_buf[AES_BLOCK_SIZE];
+	unsigned	encr_pos;
+} archive_crypto_ctx;
+
+#endif
+
+/* defines */
+#define archive_pbkdf2_sha1(pw, pw_len, salt, salt_len, rounds, dk, dk_len)\
+  __archive_cryptor.pbkdf2sha1(pw, pw_len, salt, salt_len, rounds, dk, dk_len)
+
+#define archive_decrypto_aes_ctr_init(ctx, key, key_len) \
+  __archive_cryptor.decrypto_aes_ctr_init(ctx, key, key_len)
+#define archive_decrypto_aes_ctr_update(ctx, in, in_len, out, out_len) \
+  __archive_cryptor.decrypto_aes_ctr_update(ctx, in, in_len, out, out_len)
+#define archive_decrypto_aes_ctr_release(ctx) \
+  __archive_cryptor.decrypto_aes_ctr_release(ctx)
+
+/* Minimal interface to cryptography functionality for internal use in
+ * libarchive */
+struct archive_cryptor
+{
+  /* PKCS5 PBKDF2 HMAC-SHA1 */
+  int (*pbkdf2sha1)(const char *pw, size_t pw_len, const uint8_t *salt,
+    size_t salt_len, unsigned rounds, uint8_t *derived_key,
+    size_t derived_key_len);
+  /* AES CTR mode */
+  int (*decrypto_aes_ctr_init)(archive_crypto_ctx *, const uint8_t *, size_t);
+  int (*decrypto_aes_ctr_update)(archive_crypto_ctx *, const uint8_t *,
+    size_t, uint8_t *, size_t *);
+  int (*decrypto_aes_ctr_release)(archive_crypto_ctx *);
+};
+
+extern const struct archive_cryptor __archive_cryptor;
+
+#endif