350 lines
12 KiB
C
350 lines
12 KiB
C
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/* ---- SYMMETRIC KEY STUFF -----
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*
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* We put each of the ciphers scheduled keys in their own structs then we put all of
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* the key formats in one union. This makes the function prototypes easier to use.
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*/
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#ifdef BLOWFISH
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struct blowfish_key {
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unsigned long S[4][256];
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unsigned long K[18];
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};
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#endif
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#ifdef RC5
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struct rc5_key {
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int rounds;
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unsigned long K[50];
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};
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#endif
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#ifdef RC6
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struct rc6_key {
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unsigned long K[44];
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};
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#endif
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#ifdef SAFERP
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struct saferp_key {
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unsigned char K[33][16];
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long rounds;
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};
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#endif
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#ifdef SERPENT
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struct serpent_key {
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unsigned long K[132];
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};
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#endif
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#ifdef RIJNDAEL
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struct rijndael_key {
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unsigned long eK[64], dK[64], k_len;
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};
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#endif
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#ifdef XTEA
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struct xtea_key {
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unsigned long K[4];
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};
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#endif
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#ifdef TWOFISH
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#ifndef TWOFISH_SMALL
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struct twofish_key {
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unsigned long S[4][256], K[40];
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};
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#else
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struct twofish_key {
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unsigned long K[40];
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unsigned char S[32], start;
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};
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#endif
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#endif
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#ifdef SAFER
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#define SAFER_K64_DEFAULT_NOF_ROUNDS 6
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#define SAFER_K128_DEFAULT_NOF_ROUNDS 10
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#define SAFER_SK64_DEFAULT_NOF_ROUNDS 8
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#define SAFER_SK128_DEFAULT_NOF_ROUNDS 10
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#define SAFER_MAX_NOF_ROUNDS 13
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#define SAFER_BLOCK_LEN 8
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#define SAFER_KEY_LEN (1 + SAFER_BLOCK_LEN * (1 + 2 * SAFER_MAX_NOF_ROUNDS))
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typedef unsigned char safer_block_t[SAFER_BLOCK_LEN];
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typedef unsigned char safer_key_t[SAFER_KEY_LEN];
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struct safer_key { safer_key_t key; };
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#endif
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#ifdef RC2
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struct rc2_key { unsigned xkey[64]; };
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#endif
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#ifdef DES
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struct des_key {
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unsigned long ek[32], dk[32];
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};
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struct des3_key {
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unsigned long ek[3][32], dk[3][32];
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};
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#endif
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#ifdef CAST5
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struct cast5_key {
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unsigned long K[32], keylen;
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};
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#endif
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typedef union Symmetric_key {
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#ifdef DES
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struct des_key des;
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struct des3_key des3;
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#endif
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#ifdef RC2
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struct rc2_key rc2;
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#endif
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#ifdef SAFER
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struct safer_key safer;
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#endif
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#ifdef TWOFISH
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struct twofish_key twofish;
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#endif
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#ifdef BLOWFISH
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struct blowfish_key blowfish;
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#endif
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#ifdef RC5
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struct rc5_key rc5;
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#endif
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#ifdef RC6
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struct rc6_key rc6;
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#endif
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#ifdef SAFERP
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struct saferp_key saferp;
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#endif
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#ifdef SERPENT
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struct serpent_key serpent;
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#endif
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#ifdef RIJNDAEL
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struct rijndael_key rijndael;
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#endif
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#ifdef XTEA
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struct xtea_key xtea;
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#endif
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#ifdef CAST5
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struct cast5_key cast5;
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#endif
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} symmetric_key;
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/* A block cipher ECB structure */
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typedef struct {
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int cipher, blocklen;
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symmetric_key key;
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} symmetric_ECB;
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/* A block cipher CFB structure */
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typedef struct {
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int cipher, blocklen, padlen;
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unsigned char IV[MAXBLOCKSIZE], pad[MAXBLOCKSIZE];
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symmetric_key key;
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} symmetric_CFB;
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/* A block cipher OFB structure */
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typedef struct {
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int cipher, blocklen, padlen;
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unsigned char IV[MAXBLOCKSIZE];
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symmetric_key key;
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} symmetric_OFB;
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/* A block cipher CBC structure */
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typedef struct Symmetric_CBC {
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int cipher, blocklen;
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unsigned char IV[MAXBLOCKSIZE];
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symmetric_key key;
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} symmetric_CBC;
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/* A block cipher CTR structure */
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typedef struct Symmetric_CTR {
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int cipher, blocklen, padlen;
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unsigned char ctr[MAXBLOCKSIZE], pad[MAXBLOCKSIZE];
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symmetric_key key;
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} symmetric_CTR;
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/* cipher descriptor table, last entry has "name == NULL" to mark the end of table */
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extern struct _cipher_descriptor {
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char *name;
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unsigned char ID;
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unsigned long min_key_length, max_key_length, block_length, default_rounds;
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int (*setup)(const unsigned char *key, int keylength, int num_rounds, symmetric_key *skey);
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void (*ecb_encrypt)(const unsigned char *pt, unsigned char *ct, symmetric_key *key);
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void (*ecb_decrypt)(const unsigned char *ct, unsigned char *pt, symmetric_key *key);
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int (*test)(void);
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int (*keysize)(int *desired_keysize);
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} cipher_descriptor[];
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#ifdef BLOWFISH
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extern int blowfish_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
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extern void blowfish_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *key);
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extern void blowfish_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *key);
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extern int blowfish_test(void);
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extern int blowfish_keysize(int *desired_keysize);
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extern const struct _cipher_descriptor blowfish_desc;
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#endif
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#ifdef RC5
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extern int rc5_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
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extern void rc5_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *key);
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extern void rc5_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *key);
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extern int rc5_test(void);
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extern int rc5_keysize(int *desired_keysize);
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extern const struct _cipher_descriptor rc5_desc;
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#endif
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#ifdef RC6
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extern int rc6_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
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extern void rc6_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *key);
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extern void rc6_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *key);
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extern int rc6_test(void);
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extern int rc6_keysize(int *desired_keysize);
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extern const struct _cipher_descriptor rc6_desc;
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#endif
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#ifdef RC2
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extern int rc2_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
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extern void rc2_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *key);
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extern void rc2_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *key);
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extern int rc2_test(void);
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extern int rc2_keysize(int *desired_keysize);
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extern const struct _cipher_descriptor rc2_desc;
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#endif
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#ifdef SAFERP
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extern int saferp_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
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extern void saferp_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *key);
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extern void saferp_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *key);
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extern int saferp_test(void);
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extern int saferp_keysize(int *desired_keysize);
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extern const struct _cipher_descriptor saferp_desc;
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#endif
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#ifdef SAFER
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extern int safer_k64_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
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extern int safer_sk64_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
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extern int safer_k128_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
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extern int safer_sk128_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
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extern void safer_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *key);
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extern void safer_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *key);
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extern int safer_k64_test(void);
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extern int safer_sk64_test(void);
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extern int safer_sk128_test(void);
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extern int safer_64_keysize(int *desired_keysize);
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extern int safer_128_keysize(int *desired_keysize);
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extern const struct _cipher_descriptor safer_k64_desc, safer_k128_desc, safer_sk64_desc, safer_sk128_desc;
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#endif
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#ifdef SERPENT
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extern int serpent_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
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extern void serpent_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *key);
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extern void serpent_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *key);
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extern int serpent_test(void);
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extern int serpent_keysize(int *desired_keysize);
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extern const struct _cipher_descriptor serpent_desc;
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#endif
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#ifdef RIJNDAEL
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extern int rijndael_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
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extern void rijndael_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *key);
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extern void rijndael_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *key);
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extern int rijndael_test(void);
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extern int rijndael_keysize(int *desired_keysize);
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extern const struct _cipher_descriptor rijndael_desc;
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#endif
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#ifdef XTEA
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extern int xtea_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
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extern void xtea_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *key);
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extern void xtea_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *key);
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extern int xtea_test(void);
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extern int xtea_keysize(int *desired_keysize);
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extern const struct _cipher_descriptor xtea_desc;
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#endif
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#ifdef TWOFISH
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extern int twofish_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
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extern void twofish_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *key);
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extern void twofish_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *key);
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extern int twofish_test(void);
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extern int twofish_keysize(int *desired_keysize);
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extern const struct _cipher_descriptor twofish_desc;
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#endif
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#ifdef DES
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extern int des_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
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extern void des_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *key);
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extern void des_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *key);
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extern int des_test(void);
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extern int des_keysize(int *desired_keysize);
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extern int des3_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
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extern void des3_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *key);
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extern void des3_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *key);
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extern int des3_test(void);
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extern int des3_keysize(int *desired_keysize);
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extern const struct _cipher_descriptor des_desc, des3_desc;
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#endif
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#ifdef CAST5
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extern int cast5_setup(const unsigned char *key, int keylen, int num_rounds, symmetric_key *skey);
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extern void cast5_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *key);
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extern void cast5_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *key);
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extern int cast5_test(void);
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extern int cast5_keysize(int *desired_keysize);
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extern const struct _cipher_descriptor cast5_desc;
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#endif
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#ifdef ECB
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extern int ecb_start(int cipher, const unsigned char *key,
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int keylen, int num_rounds, symmetric_ECB *ecb);
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extern int ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_ECB *ecb);
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extern int ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_ECB *ecb);
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#endif
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#ifdef CFB
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extern int cfb_start(int cipher, const unsigned char *IV, const unsigned char *key,
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int keylen, int num_rounds, symmetric_CFB *cfb);
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extern int cfb_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_CFB *cfb);
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extern int cfb_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_CFB *cfb);
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#endif
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#ifdef OFB
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extern int ofb_start(int cipher, const unsigned char *IV, const unsigned char *key,
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int keylen, int num_rounds, symmetric_OFB *ofb);
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extern int ofb_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_OFB *ofb);
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extern int ofb_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_OFB *ofb);
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#endif
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#ifdef CBC
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extern int cbc_start(int cipher, const unsigned char *IV, const unsigned char *key,
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int keylen, int num_rounds, symmetric_CBC *cbc);
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extern int cbc_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_CBC *cbc);
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extern int cbc_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_CBC *cbc);
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#endif
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#ifdef CTR
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extern int ctr_start(int cipher, const unsigned char *IV, const unsigned char *key,
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int keylen, int num_rounds, symmetric_CTR *ctr);
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extern int ctr_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_CTR *ctr);
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extern int ctr_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_CTR *ctr);
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#endif
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extern int find_cipher(const char *name);
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extern int find_cipher_any(const char *name, int blocklen, int keylen);
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extern int find_cipher_id(unsigned char ID);
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extern int register_cipher(const struct _cipher_descriptor *cipher);
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extern int unregister_cipher(const struct _cipher_descriptor *cipher);
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extern int cipher_is_valid(int idx);
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