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1.1.1.3 root 1: /* The source code contained in this file has been derived from the source code
2: of Encryption for the Masses 2.02a by Paul Le Roux. Modifications and
3: additions to that source code contained in this file are Copyright (c) 2004
1.1.1.5 ! root 4: TrueCrypt Foundation and Copyright (c) 2004 TrueCrypt Team. Unmodified
1.1.1.3 root 5: parts are Copyright (c) 1998-99 Paul Le Roux. This is a TrueCrypt Foundation
6: release. Please see the file license.txt for full license details. */
1.1 root 7:
1.1.1.5 ! root 8: /* Update the following when adding a new cipher or EA:
! 9:
! 10: Crypto.h:
! 11: ID #define
! 12: MAX_EXPANDED_KEY #define
! 13:
! 14: Crypto.c:
! 15: Ciphers[]
! 16: EncryptionAlgorithms[]
! 17: CipherInit()
! 18: EncipherBlock()
! 19: DecipherBlock()
! 20: */
1.1 root 21:
22: // User text input limits
23: #ifndef _DEBUG
1.1.1.5 ! root 24: #define MIN_PASSWORD 1 // Minimum password length
1.1 root 25: #else
26: #define MIN_PASSWORD 0
27: #endif
1.1.1.5 ! root 28: #define MAX_PASSWORD 64 // Maximum password length
! 29:
! 30: #define PASSWORD_LEN_WARNING 12 // Display a warning when a password is shorter than this
1.1 root 31:
32: // User key
33: #define USERKEY_ITERATIONS 2000
34: #define USERKEY_SALT_SIZE 64
35:
36: // Disk key + IV
37: #define DISKKEY_SIZE 256
38: #define DISK_IV_SIZE 32
39:
40: // Volume header byte offsets
41: #define HEADER_USERKEY_SALT 0
42: #define HEADER_ENCRYPTEDDATA USERKEY_SALT_SIZE
43: #define HEADER_DISKKEY 256
44:
45: // Volume header sizes
46: #define HEADER_SIZE 512
47: #define HEADER_ENCRYPTEDDATASIZE (HEADER_SIZE - HEADER_ENCRYPTEDDATA)
48:
1.1.1.5 ! root 49: /* The offset, in bytes, of the hidden volume header position from the end of the file (a positive value).
! 50: The extra offset (SECTOR_SIZE * 2) was added because FAT file system fills the last sector with zeroes
! 51: (marked as free; observed when quick format was performed using the OS format tool). One extra sector was
! 52: added to the offset for future expandability (should the header size increase, or should header backup be
! 53: introduced). */
! 54: #define HIDDEN_VOL_HEADER_OFFSET (HEADER_SIZE + SECTOR_SIZE * 2)
! 55:
1.1 root 56: // PKCS5 PRF hash algorithm ID
57: #define SHA1 1
58: #define RIPEMD160 2
1.1.1.5 ! root 59: #define LAST_PRF_ID 2 // The number of implemented/available pseudo-random functions (PKCS #5 v2.0)
! 60:
! 61: // Modes of operation
! 62: enum
! 63: {
! 64: CBC = 1,
! 65: OUTER_CBC,
! 66: INNER_CBC
! 67: };
1.1 root 68:
1.1.1.5 ! root 69: // Cipher IDs
1.1 root 70: #define NONE 0
1.1.1.5 ! root 71: #define AES 1
! 72: #define BLOWFISH 2
1.1.1.2 root 73: #define CAST 3
1.1.1.5 ! root 74: #define SERPENT 4
! 75: #define TRIPLEDES 5
! 76: #define TWOFISH 6
! 77: #define DES56 7 // Used only by Triple DES
1.1 root 78:
1.1.1.5 ! root 79: typedef struct
! 80: {
! 81: int Id; // Cipher ID
! 82: char *Name; // Name
! 83: int BlockSize; // Block size (bytes)
! 84: int KeySize; // Key size (bytes)
! 85: int KeyScheduleSize; // Scheduled key size (bytes)
! 86: } Cipher;
1.1 root 87:
1.1.1.5 ! root 88: typedef struct
! 89: {
! 90: int Ciphers[4]; // Null terminated array of ciphers used by encryption algorithm
! 91: int Mode; // The mode of operation of the whole EA (cipher cascade)
! 92: } EncryptionAlgorithm;
! 93:
! 94: // Maxium length of scheduled key
! 95: #define AES_KS (sizeof(aes_encrypt_ctx) + sizeof(aes_decrypt_ctx))
! 96: #define SERPENT_KS (140 * 4)
! 97: #define MAX_EXPANDED_KEY (AES_KS + SERPENT_KS + TWOFISH_KS)
1.1 root 98:
99: #include "des.h"
100: #include "blowfish.h"
1.1.1.2 root 101: #include "aes.h"
1.1 root 102: #include "cast.h"
1.1.1.3 root 103: #include "sha1.h"
104: #include "rmd160.h"
1.1.1.5 ! root 105: #include "serpent.h"
! 106: #include "twofish.h"
1.1 root 107:
108: typedef struct keyInfo_t
109: {
110: int noIterations; /* No.of times to iterate setup */
111: int keyLength; /* Length of the key */
112: char userKey[MAX_PASSWORD]; /* Max pass, WITHOUT +1 for the NULL */
113: char key_salt[USERKEY_SALT_SIZE]; /* Key setup salt */
114: char key[DISKKEY_SIZE]; /* The keying material itself */
115: } KEY_INFO, *PKEY_INFO;
116:
117: typedef struct CRYPTO_INFO_t
118: {
1.1.1.5 ! root 119: /* Encryption alogrithm information */
! 120: int ea;
1.1 root 121: unsigned char iv[DISK_IV_SIZE];
122: unsigned char ks[MAX_EXPANDED_KEY];
123:
1.1.1.5 ! root 124: /* Volume information */
! 125:
1.1 root 126: unsigned char master_decrypted_key[DISKKEY_SIZE];
127: unsigned char key_salt[USERKEY_SALT_SIZE];
128: int noIterations;
129: int pkcs5;
130:
131: unsigned __int64 volume_creation_time;
132: unsigned __int64 header_creation_time;
133:
1.1.1.5 ! root 134: // Hidden volume status & parameters
! 135: BOOL hiddenVolume; // Indicates whether the volume is mounted/mountable as hidden volume
! 136: unsigned __int64 hiddenVolumeSize; // Size of the hidden volume excluding the header (in bytes). Set to 0 for standard volumes.
! 137: unsigned __int64 hiddenVolumeOffset; // Absolute position, in bytes, of the first hidden volume data sector within the hosting volume (provided that there is a hidden volume).
1.1 root 138:
1.1.1.5 ! root 139: } CRYPTO_INFO, *PCRYPTO_INFO;
1.1 root 140:
141: PCRYPTO_INFO crypto_open (void);
142: void crypto_loadkey (PKEY_INFO keyInfo, char *lpszUserKey, int nUserKeyLen);
143: void crypto_close (PCRYPTO_INFO cryptoInfo);
1.1.1.5 ! root 144:
! 145: int CipherGetBlockSize (int cipher);
! 146: int CipherGetKeySize (int cipher);
! 147: int CipherGetKeyScheduleSize (int cipher);
! 148: char * CipherGetName (int cipher);
! 149:
! 150: void CipherInit (int cipher, unsigned char *key, unsigned char *ks);
! 151: void EAInit (int ea, unsigned char *key, unsigned char *ks);
! 152: void EncipherBlock(int cipher, void *data, void *ks);
! 153: void DecipherBlock(int cipher, void *data, void *ks);
! 154:
! 155: int EAGetFirst ();
! 156: int EAGetCount (void);
! 157: int EAGetNext (int previousEA);
! 158: char * EAGetName (char *buf, int ea);
! 159: int EAGetKeySize (int ea);
! 160: int EAGetMode (int ea);
! 161: char * EAGetModeName (char *name, int ea, BOOL capitalLetters);
! 162: int EAGetKeyScheduleSize (int ea);
! 163: int EAGetLargestKey ();
! 164:
! 165: int EAGetCipherCount (int ea);
! 166: int EAGetFirstCipher (int ea);
! 167: int EAGetLastCipher (int ea);
! 168: int EAGetNextCipher (int ea, int previousCipherId);
! 169: int EAGetPreviousCipher (int ea, int previousCipherId);
! 170:
1.1 root 171: char * get_hash_name (int pkcs5);
1.1.1.5 ! root 172:
! 173: void EncryptBuffer (unsigned long *buf, unsigned __int64 len, unsigned char *ks, void *iv, void *whitening, int ea);
! 174: void DecryptBuffer (unsigned long *buf, unsigned __int64 len, unsigned char *ks, void *iv, void *whitening, int ea);
! 175: void _cdecl EncryptSectors (unsigned long *buf, unsigned __int64 secNo, unsigned __int64 noSectors, unsigned char *ks, void *iv, int ea);
! 176: void _cdecl DecryptSectors (unsigned long *buf, unsigned __int64 secNo, unsigned __int64 noSectors, unsigned char *ks, void *iv, int ea);
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