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Annotation of truecrypt/common/crypto.h, revision 1.1.1.3

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
        !             4:    TrueCrypt Team and Copyright (c) 2004 TrueCrypt Foundation. Unmodified
        !             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: 
                      8: 
                      9: // User text input limits
                     10: #ifndef _DEBUG
                     11: #define MIN_PASSWORD           12
                     12: #else
                     13: #define MIN_PASSWORD           0
                     14: #endif
                     15: #define MAX_PASSWORD           64               
                     16: 
                     17: // User key
                     18: #define USERKEY_ITERATIONS     2000
                     19: #define USERKEY_SALT_SIZE      64
                     20: 
                     21: // Disk key + IV
                     22: #define DISKKEY_SIZE           256
                     23: #define DISK_IV_SIZE           32
                     24: 
                     25: // Volume header byte offsets
                     26: #define        HEADER_USERKEY_SALT             0
                     27: #define HEADER_ENCRYPTEDDATA   USERKEY_SALT_SIZE
                     28: #define        HEADER_DISKKEY                  256
                     29: 
                     30: // Volume header sizes
                     31: #define HEADER_SIZE                                    512
                     32: #define HEADER_ENCRYPTEDDATASIZE       (HEADER_SIZE - HEADER_ENCRYPTEDDATA)
                     33: 
                     34: // PKCS5 PRF hash algorithm ID
                     35: #define        SHA1                            1
                     36: #define        RIPEMD160                       2
1.1.1.3 ! root       37: #define LAST_PRF_ID                    2                       // Last PRF used for volume encryption
1.1       root       38: 
                     39: /* The encryption algorithm ID  */
                     40: #define NONE                           0
                     41: #define BLOWFISH                       1
1.1.1.2   root       42: #define AES                                    2
                     43: #define CAST                           3
                     44: #define IDEA                           4
                     45: #define TRIPLEDES                      5
1.1       root       46: #define DES56                          100                     // Used only for DES test vectors
                     47: 
1.1.1.2   root       48: #define LAST_CIPHER_ID         5                       // Last cipher used for volume encryption
1.1       root       49: 
                     50: // Length in bytes of the longest key used by encryption algorithms
                     51: #define        MAX_CIPHER_KEY          56                      // Blowfish 448 bits
                     52: 
                     53: /* Length of scheduled keys */
                     54: #define IDEA_KS                                104
                     55: #define DES_KS                         128
                     56: #define TRIPLEDES_KS           (DES_KS*3)
                     57: #define BLOWFISH_KS                    4168
1.1.1.2   root       58: #define AES_KS                         240
1.1       root       59: #define CAST_KS                                128
                     60: 
                     61: #define MAX_EXPANDED_KEY               4168
                     62: 
                     63: #include "des.h"
                     64: #include "blowfish.h"
1.1.1.2   root       65: #include "aes.h"
1.1       root       66: #include "idea.h"
                     67: #include "cast.h"
1.1.1.3 ! root       68: #include "sha1.h"
        !            69: #include "rmd160.h"
1.1       root       70: 
                     71: /* _cdecl is needed here because the device driver defaults to stdcall */
                     72: typedef void (_cdecl * sector_func) (unsigned long *, unsigned __int64, unsigned long,
                     73:                                     unsigned char *, unsigned char *, int);
                     74: 
                     75: typedef struct keyInfo_t
                     76: {
                     77:        int noIterations;                                       /* No.of times to iterate setup */
                     78:        int keyLength;                                          /* Length of the key */
                     79:        char userKey[MAX_PASSWORD];                     /* Max pass, WITHOUT +1 for the NULL */
                     80:        char key_salt[USERKEY_SALT_SIZE];       /* Key setup salt */
                     81:        char key[DISKKEY_SIZE];                         /* The keying material itself */
                     82: } KEY_INFO, *PKEY_INFO;
                     83: 
                     84: typedef struct CRYPTO_INFO_t
                     85: {
                     86:        /* cipher information */
                     87:        int cipher;
                     88:        sector_func encrypt_sector;
                     89:        sector_func decrypt_sector;
                     90:        unsigned char iv[DISK_IV_SIZE];
                     91:        unsigned char ks[MAX_EXPANDED_KEY];
                     92: 
                     93:        /* volume information */
                     94:        unsigned char master_decrypted_key[DISKKEY_SIZE];
                     95:        unsigned char key_salt[USERKEY_SALT_SIZE];
                     96:        int noIterations;
                     97:        int pkcs5;
                     98: 
                     99:        unsigned __int64 volume_creation_time;
                    100:        unsigned __int64 header_creation_time;
                    101: } CRYPTO_INFO, *PCRYPTO_INFO;
                    102: 
                    103: #define decipher_block(cipher, data, ks) \
                    104: {\
                    105:        if (cipher == BLOWFISH) BF_decrypt ((void *) data, (void *) ks); \
1.1.1.2   root      106:        else if (cipher == AES) aes_decrypt ((void *) data, (void *) data, (void *)((char *)(ks)+sizeof(aes_encrypt_ctx))); \
1.1       root      107:        else if (cipher == IDEA) ideaCrypt ((void *) data,(void *)  data, (void *) ((char *) ks + IDEA_KS)); \
                    108:        else if (cipher == DES56) des_encrypt ((void *) data, (void *) ks, 0); \
                    109:        else if (cipher == CAST) CAST_ecb_encrypt((void *) data,(void *) data,(void*)ks,0);  \
                    110:        else if (cipher == TRIPLEDES) des_ecb3_encrypt ((void *) data,(void *) data, (void *) ks, \
                    111:                (void*)((char*)ks+DES_KS),(void*)((char*)ks+DES_KS*2),0); \
                    112: }
                    113: 
                    114: #define encipher_block(cipher, data, ks) \
                    115: {\
                    116:        if (cipher == BLOWFISH) BF_encrypt ((void *) data, (void *) ks); \
1.1.1.2   root      117:        else if (cipher == AES) aes_encrypt ((void *) data, (void *) data, (void *) ks); \
1.1       root      118:        else if (cipher == IDEA) ideaCrypt ((void *) data, (void *) data, (void *) ks); \
                    119:        else if (cipher == DES56) des_encrypt ((void *) data, (void *) ks, 1); \
                    120:        else if (cipher == CAST) CAST_ecb_encrypt((void *) data,(void *) data,(void*)ks,1);  \
                    121:        else if (cipher == TRIPLEDES) des_ecb3_encrypt ((void *) data,(void *) data, (void *) ks, \
                    122:                (void*)((char*)ks+DES_KS),(void*)((char*)ks+DES_KS*2),1); \
                    123: }
                    124: 
                    125: #define init_cipher(cipher, key, ks) \
                    126: {\
                    127:        if (cipher == BLOWFISH) BF_set_key ((void*)ks, 56, (void*) (key)); \
1.1.1.2   root      128:        else if (cipher == AES) {aes_encrypt_key((void*)(key), 32, (void*)ks); aes_decrypt_key((void*)(key), 32, (void*)((char *)(ks)+sizeof(aes_encrypt_ctx)));} \
1.1       root      129:        else if (cipher == IDEA) ideaExpandKey ((void*) (key), (void*)ks, (void *) ((char *) ks + IDEA_KS)); \
                    130:        else if (cipher == DES56) des_key_sched ((void*) (key), (void*)ks); \
                    131:        else if (cipher == CAST) CAST_set_key((void*)ks, 16, (void*)(key)); \
                    132:        else if (cipher == TRIPLEDES) {  \
                    133:                des_key_sched ((void*) (key), (void*)ks); \
                    134:                des_key_sched ((void*) ((char*)(key)+8), (void*)((char*)ks+DES_KS)); \
                    135:                des_key_sched ((void*) ((char*)(key)+16), (void*)((char*)ks+DES_KS*2)); \
                    136:        } \
                    137: }
                    138: 
                    139: 
                    140: PCRYPTO_INFO crypto_open (void);
                    141: void crypto_loadkey (PKEY_INFO keyInfo, char *lpszUserKey, int nUserKeyLen);
                    142: void crypto_close (PCRYPTO_INFO cryptoInfo);
                    143: int get_block_size (int cipher);
                    144: int get_key_size (int cipher);
                    145: char * get_cipher_name (int cipher);
                    146: char * get_hash_name (int pkcs5);

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