/* * blowfish.c : Source code for the Blowfish block cipher * * Part of the Python Cryptography Toolkit * * Distribute and use freely; there are no restrictions on further * dissemination and usage except those imposed by the laws of your * country of residence. * */ /*************************************************************************/ /* File: bf.c Blowfish cipher by Bruce Schneier, Code by Bryan Olson, based partly on Schneier's. */ #include "Python.h" #define MODULE_NAME Blowfish #define BLOCK_SIZE 8 #define KEY_SIZE 0 /* Define IntU32 to be an unsigned in 32 bits long */ typedef unsigned int IntU32 ; typedef unsigned char IntU8 ; #define NROUNDS 16 /* Define IntP to be an integer which is the same size as a pointer. */ typedef unsigned long IntP ; typedef struct { IntU32 p[2][NROUNDS+2], sbox[4][256] ; } BFkey_type ; typedef struct { BFkey_type bfkey; } block_state; /* File bfinit.h Data to initialize P and S in BlowFish. */ static IntU32 p_init[NROUNDS+2] = { 608135816UL, 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3383383037UL, 1655181056UL, 3139813346UL, 901632758UL, 1897031941UL, 2986607138UL, 3066810236UL, 3447102507UL, 1393639104UL, 373351379UL, 950779232UL, 625454576UL, 3124240540UL, 4148612726UL, 2007998917UL, 544563296UL, 2244738638UL, 2330496472UL, 2058025392UL, 1291430526UL, 424198748UL, 50039436UL, 29584100UL, 3605783033UL, 2429876329UL, 2791104160UL, 1057563949UL, 3255363231UL, 3075367218UL, 3463963227UL, 1469046755UL, 985887462UL} } ; /* sLb(s,n) allows us to subsript s by byte offsets, which allows us to avoid a subscript scaling. */ #define sub(s,n) *((IntU32 *)((IntP)s+(n))) /* Below is one BlowFish round including the F function */ #define bf_round(l,r,n) \ l ^= P[n]; \ r ^= ( (sub(S[0],l>>22 & 0x3fc) + sub(S[1],l>>14 & 0x3fc)) \ ^ sub(S[2],l>>6 & 0x3fc) ) +S[3][l & 0xff] /* This function requires the block to be two 32 bit integers, in whatever endian form the machine uses. On little endian machines use crypt_8bytes() on user data. make_bfkey should call crypt_block on either endian machine. Pass direction 0 to encrypt, 1 to decrypt. */ static void crypt_block(IntU32 block[2], BFkey_type *bfkey, int direction) { register IntU32 left, right, (*S)[256], *P ; left = block[0] ; right = block[1] ; S = bfkey->sbox ; P = bfkey->p[direction] ; bf_round( left, right, 0 ) ; bf_round( right, left, 1 ) ; bf_round( left, right, 2 ) ; bf_round( right, left, 3 ) ; bf_round( left, right, 4 ) ; bf_round( right, left, 5 ) ; bf_round( left, right, 6 ) ; bf_round( right, left, 7 ) ; bf_round( left, right, 8 ) ; bf_round( right, left, 9 ) ; bf_round( left, right, 10 ) ; bf_round( right, left, 11 ) ; bf_round( left, right, 12 ) ; bf_round( right, left, 13 ) ; bf_round( left, right, 14 ) ; bf_round( right, left, 15 ) ; left = left ^ P[NROUNDS] ; right = right ^ P[NROUNDS+1] ; block[0] = right ; block[1] = left ; } /* The following should be allignment and endian independent. I have not tested it on a little-endian machine. It takes the input block from source, and puts the output in dest. They can be the same. It takes the same direction parameter as crypt_block(). */ static void crypt_8bytes(IntU8 *source, IntU8 *dest, BFkey_type *bfkey, int direction) { IntU32 block[2] ; block[0] = source[3] | source[2]<<8 | source[1]<<16 | source[0]<<24 ; block[1] = source[7] | source[6]<<8 | source[5]<<16 | source[4]<<24 ; crypt_block( block, bfkey, direction ) ; dest[0]= block[0]>>24 ; dest[1]= block[0]>>16 & 0xff ; dest[2]= block[0]>>8 & 0xff ; dest[3]= block[0] & 0xff ; dest[4]= block[1]>>24 ; dest[5]= block[1]>>16 & 0xff ; dest[6]= block[1]>> 8 & 0xff ; dest[7]= block[1] & 0xff ; } /* make_bfkey() takes the address of the key data as a char*, and the length of the key in bytes. It generates and returns a pointer to an object of BFkey_type, which can be passed to the crypt functions. It does some simple testing of the init data and crypt routine, and returns 0 on error. */ static void make_bfkey(unsigned char *key_string, int keylength, BFkey_type *bfkey) { int i, j, k ; IntU32 dspace[2], checksum=0 ; /* Copy constant initial data to P vector */ for( i=0 ; ip[0][i] = p_init[i] ; bfkey->p[1][NROUNDS+1-i] = p_init[i] ; checksum = (checksum<<1 | checksum>>31)+p_init[i] ; } /* Copy constant initial data to sboxes */ for( i=0 ; i<4 ; ++i ) for( j=0 ; j<256 ; ++j ) { bfkey->sbox[i][j] = s_init[i][j] ; checksum = ((checksum*13)<<11 | (checksum*13)>>21) + s_init[i][j] ; } /* Test init data. */ if( checksum != 0x55861a61 ) { PyErr_SetString(PyExc_SystemError, "Blowfish: Bad initialization data"); return; } dspace[0] = 0 ; dspace[1] = 0 ; /* Test the crypt_block() routine. */ for( i=0 ; i<10 ; ++i ) crypt_block( dspace, bfkey, 0 ) ; checksum = dspace[0] ; for( i=0 ; i<10 ; ++i ) crypt_block( dspace, bfkey, 1 ) ; if( (checksum!=0xaafe4ebd) || dspace[0] || dspace[1] ) { PyErr_SetString(PyExc_SystemError, "Blowfish: Error in crypt_block routine"); return; } /* Xor key string into encryption key vector */ j = 0 ; for (i=0 ; ip)[0][i] ^= data; } for (i = 0 ; ip[0][i] = dspace[0] ; bfkey->p[1][NROUNDS+1-i] = dspace[0] ; bfkey->p[0][i+1] = dspace[1] ; bfkey->p[1][NROUNDS-i] = dspace[1] ; } for ( i=0 ; i<4 ; ++i ) for ( j=0 ; j<256 ; j+=2 ) { crypt_block( dspace, bfkey, 0 ) ; bfkey->sbox[i][j] = dspace[0] ; bfkey->sbox[i][j+1] = dspace[1] ; } } static void block_encrypt(block_state *self, unsigned char *in, unsigned char *out) { crypt_8bytes(in, out, &(self->bfkey), 0); } static void block_decrypt(block_state *self, unsigned char *in, unsigned char *out) { crypt_8bytes(in, out, &(self->bfkey), 1); } static void block_init(block_state *self, unsigned char *key, int keylength) { make_bfkey(key, keylength, &(self->bfkey)); } #include "block_template.c"