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Annotation of pgp/src/basslib2.c, revision 1.1.1.1

1.1       root        1: /*     basslib2.c - Bassomatic encryption password routines.
                      2:        (c) 1989 Philip Zimmermann.  All rights reserved.
                      3:        Implemented in Microsoft C.
                      4:        Routines for getting a Bassomatic-specific pass phrase from the 
                      5:        user's console.
                      6: */
                      7: 
                      8: #include       <stdio.h>       /* for fprintf() */
                      9: #include       <ctype.h>       /* for isdigit(), toupper(), etc. */
                     10: #include       <string.h>      /* for strlen() */
                     11: 
                     12: #include       "random.h"      /* for getstring() */
                     13: #include       "basslib.h"
                     14: #include       "basslib2.h"
                     15: 
                     16: 
                     17: #define hexdigit(c) (isdigit((c))) ? ((c)-'0') : \
                     18:        ( isxdigit((c)) ? (toupper((c))-'A'+10) : 0 )
                     19: 
                     20: static unsigned int gethex(char *p)
                     21:        /* Evaluate hex digit string */
                     22: {      unsigned int n;
                     23:        n = 0;
                     24:        while (isxdigit(*p)) {
                     25:                n = (n << 4) | ((int) hexdigit(*p));
                     26:                p++;
                     27:        }
                     28:        return (n);
                     29: } /* gethex */
                     30: 
                     31: 
                     32: /*
                     33: **     getpassword - get Bassomatic pass phrase from user.
                     34:        Parameters:
                     35:                returns char *keystring
                     36:                byte noecho:  
                     37:                        0=ask once, echo. 
                     38:                        1=ask once, no echo. 
                     39:                        2=ask twice, no echo.
                     40:                int defaultc:  default key control byte, or -1 to prompt
                     41:        returns length of resulting keystring
                     42: */
                     43: int getpassword(char *keystring, byte noecho, int defaultc)
                     44: {      char keystr2[256];
                     45:        char c;
                     46:        if (defaultc == -1) {
                     47:                fprintf(stderr,"\nEnter the Bassomatic key control byte in hex: ");
                     48:                fprintf(stderr,"\n(default = 12 hex): ");
                     49:                getstring(keystr2,48,TRUE);
                     50:                c = (strlen(keystr2)==0) ? 0x12 : gethex(keystr2);
                     51:        }
                     52:        else    c = defaultc;
                     53: 
                     54:        *keystring++ = c;
                     55: 
                     56:        while (TRUE) {
                     57:                fprintf(stderr,"\nEnter pass phrase: ");
                     58:                if (!noecho) fputc('\n',stderr);
                     59:                getstring(keystring,MAXKEYLEN-1,!noecho);
                     60:                if (noecho<2)   /* no need to ask again if user can see it */
                     61:                        break;
                     62:                fprintf(stderr,"\nEnter same pass phrase again: ");
                     63:                if (!noecho) fputc('\n',stderr);
                     64:                getstring(keystr2,MAXKEYLEN-1,!noecho);
                     65:                if (strcmp(keystring,keystr2)==0)
                     66:                        break;
                     67:                fprintf(stderr,"\n\aError: Pass phrases were different.  Try again.");
                     68:        }
                     69: 
                     70:        /* if (strlen(keystring)==0)
                     71:                strcpy(keystring," "); */ /* guarantee nonzero length */
                     72: 
                     73:        return(strlen(keystring));
                     74: }      /* getpassword */
                     75: 

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