diff options
Diffstat (limited to 'Modules/rotormodule.c')
| -rw-r--r-- | Modules/rotormodule.c | 97 |
1 files changed, 89 insertions, 8 deletions
diff --git a/Modules/rotormodule.c b/Modules/rotormodule.c index e40615f..e8fec07 100644 --- a/Modules/rotormodule.c +++ b/Modules/rotormodule.c @@ -1,6 +1,4 @@ /*********************************************************** -Copyright 1992 by Lance Ellinghouse (lance@markv.com). - Copyright 1991, 1992 by Stichting Mathematisch Centrum, Amsterdam, The Netherlands. @@ -23,6 +21,19 @@ ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. ******************************************************************/ +/****************************************************************** +Copyright 1992 by Lance Ellinghouse (lance@markv.com) + +All Rights Reserved + +Permission to use, copy, distribute for any purpose and without fee +is hereby granted, provided that this copyright notice appear in +all copies and that both this copyright notice and this permission +notice appear in supporting documentation. +Permission to make any changes is granted on the basis that all +changes and improvements are also forwarded to Lance Ellinghouse +before distribution. +******************************************************************/ /* This creates an encryption and decryption engine I am calling a rotor due to the original design was a harware rotor with @@ -35,9 +46,19 @@ Rotor Module: Rotor Objects: +- ro.setkey('string') -> None (resets the key as defined in newrotor(). - ro.encrypt('string') -> encrypted string - ro.decrypt('encrypted string') -> unencrypted string +- ro.encryptmore('string') -> encrypted string +- ro.decryptmore('encrypted string') -> unencrypted string + +NOTE: the {en,de}cryptmore() methods use the setup that was + established via the {en,de}crypt calls. They will NOT + re-initalize the rotors unless: 1) They have not been + initalized with {en,de}crypt since the last setkey() call; + 2) {en,de}crypt has not been called for this rotor yet. + NOTE: you MUST use the SAME key in rotor.newrotor() if you wish to decrypt an encrypted string. Also, the encrypted string is NOT 0-127 ASCII. @@ -51,11 +72,14 @@ NOTE: you MUST use the SAME key in rotor.newrotor() #include "modsupport.h" #include <stdio.h> #include <math.h> +#define TRUE 1 +#define FALSE 0 typedef struct { OB_HEAD int seed[3]; short key[5]; + int isinited; int size; int size_mask; int rotors; @@ -79,6 +103,7 @@ rotorobject *r; r->seed[0] = r->key[0]; r->seed[1] = r->key[1]; r->seed[2] = r->key[2]; + r->isinited = FALSE; } /* Return the next random number in the range [0.0 .. 1.0) */ @@ -120,6 +145,7 @@ static short r_rand(r,s) rotorobject *r; short s; { + /*short tmp = (short)((int)(r_random(r) * (float)32768.0) % 32768);*/ short tmp = (short)((short)(r_random(r) * (float)s) % s); return tmp; } @@ -360,6 +386,7 @@ static void RTR_init(r) r->advances[i] = (1+(2*(r_rand(r,r->size/2)))); RTR_permute_rotor(r,&(r->e_rotor[(i*r->size)]),&(r->d_rotor[(i*r->size)])); } + r->isinited = TRUE; } /*(defun RTR-advance () @@ -497,13 +524,15 @@ static unsigned char RTR_d_char(r, c) (let ((fc (following-char))) (insert-char (RTR-e-char fc) 1) (delete-char 1))))))*/ -static void RTR_e_region(r, beg, len) +static void RTR_e_region(r, beg, len, doinit) rotorobject *r; unsigned char *beg; int len; + int doinit; { register int i; - RTR_init(r); + if (doinit || r->isinited == FALSE) + RTR_init(r); for (i=0;i<len;i++) { beg[i]=RTR_e_char(r,beg[i]); } @@ -519,13 +548,15 @@ static void RTR_e_region(r, beg, len) (let ((fc (following-char))) (insert-char (RTR-d-char fc) 1) (delete-char 1))))))*/ -void static RTR_d_region(r, beg, len) +void static RTR_d_region(r, beg, len, doinit) rotorobject *r; unsigned char *beg; int len; + int doinit; { register int i; - RTR_init(r); + if (doinit || r->isinited == FALSE) + RTR_init(r); for (i=0;i<len;i++) { beg[i]=RTR_d_char(r,beg[i]); } @@ -605,7 +636,31 @@ rotor_encrypt(self, args) } memset(tmp,'\0',len+1); memcpy(tmp,string,len); - RTR_e_region(self,tmp,len); + RTR_e_region(self,tmp,len, TRUE); + rtn = newsizedstringobject(tmp,len); + free(tmp); + return(rtn); +} + +static object * +rotor_encryptmore(self, args) + rotorobject *self; + object *args; +{ + char *string = (char *)NULL; + int len = 0; + object *rtn = (object *)NULL; + char *tmp; + + if (!getargs(args,"s#",&string, &len)) + return NULL; + if (!(tmp = (char *)malloc(len+5))) { + err_nomem(); + return NULL; + } + memset(tmp,'\0',len+1); + memcpy(tmp,string,len); + RTR_e_region(self,tmp,len, FALSE); rtn = newsizedstringobject(tmp,len); free(tmp); return(rtn); @@ -629,7 +684,31 @@ rotor_decrypt(self, args) } memset(tmp,'\0',len+1); memcpy(tmp,string,len); - RTR_d_region(self,tmp,len); + RTR_d_region(self,tmp,len, TRUE); + rtn = newsizedstringobject(tmp,len); + free(tmp); + return(rtn); +} + +static object * +rotor_decryptmore(self, args) + rotorobject *self; + object *args; +{ + char *string = (char *)NULL; + int len = 0; + object *rtn = (object *)NULL; + char *tmp; + + if (!getargs(args,"s#",&string, &len)) + return NULL; + if (!(tmp = (char *)malloc(len+5))) { + err_nomem(); + return NULL; + } + memset(tmp,'\0',len+1); + memcpy(tmp,string,len); + RTR_d_region(self,tmp,len, FALSE); rtn = newsizedstringobject(tmp,len); free(tmp); return(rtn); @@ -651,7 +730,9 @@ rotor_setkey(self, args) static struct methodlist rotor_methods[] = { {"encrypt", rotor_encrypt}, + {"encryptmore", rotor_encryptmore}, {"decrypt", rotor_decrypt}, + {"decryptmore", rotor_decryptmore}, {"setkey", rotor_setkey}, {NULL, NULL} /* sentinel */ }; |