VeraCrypt
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+/*
+ ---------------------------------------------------------------------------
+ Copyright (c) 1998-2007, Brian Gladman, Worcester, UK. All rights reserved.
+
+ LICENSE TERMS
+
+ The free distribution and use of this software is allowed (with or without
+ changes) provided that:
+
+ 1. source code distributions include the above copyright notice, this
+ list of conditions and the following disclaimer;
+
+ 2. binary distributions include the above copyright notice, this list
+ of conditions and the following disclaimer in their documentation;
+
+ 3. the name of the copyright holder is not used to endorse products
+ built using this software without specific written permission.
+
+ DISCLAIMER
+
+ This software is provided 'as is' with no explicit or implied warranties
+ in respect of its properties, including, but not limited to, correctness
+ and/or fitness for purpose.
+ ---------------------------------------------------------------------------
+ Issue Date: 20/12/2007
+
+ This file contains the definitions required to use AES in C. See aesopt.h
+ for optimisation details.
+*/
+
+/* Adapted for TrueCrypt */
+
+#ifndef _AES_H
+#define _AES_H
+
+#include "Common/Tcdefs.h"
+
+#ifndef EXIT_SUCCESS
+#define EXIT_SUCCESS 0
+#define EXIT_FAILURE 1
+#endif
+#define INT_RETURN int
+
+#if defined(__cplusplus)
+extern "C"
+{
+#endif
+
+// #define AES_128 /* define if AES with 128 bit keys is needed */
+// #define AES_192 /* define if AES with 192 bit keys is needed */
+#define AES_256 /* define if AES with 256 bit keys is needed */
+// #define AES_VAR /* define if a variable key size is needed */
+// #define AES_MODES /* define if support is needed for modes */
+
+/* The following must also be set in assembler files if being used */
+
+#define AES_ENCRYPT /* if support for encryption is needed */
+#define AES_DECRYPT /* if support for decryption is needed */
+#define AES_ERR_CHK /* for parameter checks & error return codes */
+#define AES_REV_DKS /* define to reverse decryption key schedule */
+
+#define AES_BLOCK_SIZE 16 /* the AES block size in bytes */
+#define N_COLS 4 /* the number of columns in the state */
+
+/* The key schedule length is 11, 13 or 15 16-byte blocks for 128, */
+/* 192 or 256-bit keys respectively. That is 176, 208 or 240 bytes */
+/* or 44, 52 or 60 32-bit words. */
+
+#if defined( AES_VAR ) || defined( AES_256 )
+#define KS_LENGTH 60
+#elif defined( AES_192 )
+#define KS_LENGTH 52
+#else
+#define KS_LENGTH 44
+#endif
+
+#if defined( AES_ERR_CHK )
+#define AES_RETURN INT_RETURN
+#else
+#define AES_RETURN VOID_RETURN
+#endif
+
+/* the character array 'inf' in the following structures is used */
+/* to hold AES context information. This AES code uses cx->inf.b[0] */
+/* to hold the number of rounds multiplied by 16. The other three */
+/* elements can be used by code that implements additional modes */
+
+typedef union
+{ uint_32t l;
+ uint_8t b[4];
+} aes_inf;
+
+typedef struct
+{ uint_32t ks[KS_LENGTH];
+ aes_inf inf;
+} aes_encrypt_ctx;
+
+typedef struct
+{ uint_32t ks[KS_LENGTH];
+ aes_inf inf;
+} aes_decrypt_ctx;
+
+/* This routine must be called before first use if non-static */
+/* tables are being used */
+
+AES_RETURN aes_init(void);
+
+/* Key lengths in the range 16 <= key_len <= 32 are given in bytes, */
+/* those in the range 128 <= key_len <= 256 are given in bits */
+
+#if defined( AES_ENCRYPT )
+
+#if defined(AES_128) || defined(AES_VAR)
+AES_RETURN aes_encrypt_key128(const unsigned char *key, aes_encrypt_ctx cx[1]);
+#endif
+
+#if defined(AES_192) || defined(AES_VAR)
+AES_RETURN aes_encrypt_key192(const unsigned char *key, aes_encrypt_ctx cx[1]);
+#endif
+
+#if defined(AES_256) || defined(AES_VAR)
+AES_RETURN aes_encrypt_key256(const unsigned char *key, aes_encrypt_ctx cx[1]);
+#endif
+
+#if defined(AES_VAR)
+AES_RETURN aes_encrypt_key(const unsigned char *key, int key_len, aes_encrypt_ctx cx[1]);
+#endif
+
+AES_RETURN aes_encrypt(const unsigned char *in, unsigned char *out, const aes_encrypt_ctx cx[1]);
+
+#endif
+
+#if defined( AES_DECRYPT )
+
+#if defined(AES_128) || defined(AES_VAR)
+AES_RETURN aes_decrypt_key128(const unsigned char *key, aes_decrypt_ctx cx[1]);
+#endif
+
+#if defined(AES_192) || defined(AES_VAR)
+AES_RETURN aes_decrypt_key192(const unsigned char *key, aes_decrypt_ctx cx[1]);
+#endif
+
+#if defined(AES_256) || defined(AES_VAR)
+AES_RETURN aes_decrypt_key256(const unsigned char *key, aes_decrypt_ctx cx[1]);
+#endif
+
+#if defined(AES_VAR)
+AES_RETURN aes_decrypt_key(const unsigned char *key, int key_len, aes_decrypt_ctx cx[1]);
+#endif
+
+AES_RETURN aes_decrypt(const unsigned char *in, unsigned char *out, const aes_decrypt_ctx cx[1]);
+
+#endif
+
+#if defined(AES_MODES)
+
+/* Multiple calls to the following subroutines for multiple block */
+/* ECB, CBC, CFB, OFB and CTR mode encryption can be used to handle */
+/* long messages incremantally provided that the context AND the iv */
+/* are preserved between all such calls. For the ECB and CBC modes */
+/* each individual call within a series of incremental calls must */
+/* process only full blocks (i.e. len must be a multiple of 16) but */
+/* the CFB, OFB and CTR mode calls can handle multiple incremental */
+/* calls of any length. Each mode is reset when a new AES key is */
+/* set but ECB and CBC operations can be reset without setting a */
+/* new key by setting a new IV value. To reset CFB, OFB and CTR */
+/* without setting the key, aes_mode_reset() must be called and the */
+/* IV must be set. NOTE: All these calls update the IV on exit so */
+/* this has to be reset if a new operation with the same IV as the */
+/* previous one is required (or decryption follows encryption with */
+/* the same IV array). */
+
+AES_RETURN aes_test_alignment_detection(unsigned int n);
+
+AES_RETURN aes_ecb_encrypt(const unsigned char *ibuf, unsigned char *obuf,
+ int len, const aes_encrypt_ctx cx[1]);
+
+AES_RETURN aes_ecb_decrypt(const unsigned char *ibuf, unsigned char *obuf,
+ int len, const aes_decrypt_ctx cx[1]);
+
+AES_RETURN aes_cbc_encrypt(const unsigned char *ibuf, unsigned char *obuf,
+ int len, unsigned char *iv, const aes_encrypt_ctx cx[1]);
+
+AES_RETURN aes_cbc_decrypt(const unsigned char *ibuf, unsigned char *obuf,
+ int len, unsigned char *iv, const aes_decrypt_ctx cx[1]);
+
+AES_RETURN aes_mode_reset(aes_encrypt_ctx cx[1]);
+
+AES_RETURN aes_cfb_encrypt(const unsigned char *ibuf, unsigned char *obuf,
+ int len, unsigned char *iv, aes_encrypt_ctx cx[1]);
+
+AES_RETURN aes_cfb_decrypt(const unsigned char *ibuf, unsigned char *obuf,
+ int len, unsigned char *iv, aes_encrypt_ctx cx[1]);
+
+#define aes_ofb_encrypt aes_ofb_crypt
+#define aes_ofb_decrypt aes_ofb_crypt
+
+AES_RETURN aes_ofb_crypt(const unsigned char *ibuf, unsigned char *obuf,
+ int len, unsigned char *iv, aes_encrypt_ctx cx[1]);
+
+typedef void cbuf_inc(unsigned char *cbuf);
+
+#define aes_ctr_encrypt aes_ctr_crypt
+#define aes_ctr_decrypt aes_ctr_crypt
+
+AES_RETURN aes_ctr_crypt(const unsigned char *ibuf, unsigned char *obuf,
+ int len, unsigned char *cbuf, cbuf_inc ctr_inc, aes_encrypt_ctx cx[1]);
+
+#endif
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif