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

1.1       root        1: /*     passwd.c - Password reading/hashing routines
                      2:        (c) 1989 Philip Zimmermann.  All rights reserved.
                      3:        Implemented in Microsoft C.
                      4:        Routines for getting a pass phrase from the user's console.
                      5: */
                      6: 
                      7: #include       <stdio.h>       /* for fprintf() */
                      8: #include       <ctype.h>       /* for isdigit(), toupper(), etc. */
                      9: #include       <string.h>      /* for strlen() */
                     10: 
                     11: #include       "random.h"      /* for getstring() */
                     12: #include       "md5.h"
                     13: #include       "language.h"
                     14: #include       "pgp.h"
                     15: 
                     16: #define MAXKEYLEN 254  /* max byte length of pass phrase */
                     17: 
                     18: boolean showpass = FALSE;
                     19: 
                     20: /*
                     21: **     hashpass - Hash pass phrase down to 128 bits (16 bytes).
                     22: **  keylen must be less than 1024.
                     23: **     Use the MD5 algorithm.
                     24: */
                     25: void hashpass (char *keystring, int keylen, byte *hash)
                     26: {
                     27:        MD5_CTX mdContext;
                     28:        int             i;
                     29: 
                     30:        /* Calculate the hash */
                     31:        MD5Init(&mdContext);
                     32:        MD5Update(&mdContext, (unsigned char *) keystring, keylen);
                     33:        MD5Final(&mdContext);
                     34:        /* Copy it to return variable */
                     35:        memcpy(hash, mdContext.digest, 16);
                     36: }      /* hashpass */
                     37: 
                     38: 
                     39: /*
                     40: **     getideakey - get pass phrase from user, hashes it to an IDEA key.
                     41:        Parameters:
                     42:                returns char *keystring as the pass phrase itself
                     43:                return char *hash as the 16-byte hash of the pass phrase
                     44:                                using MD5.
                     45:                byte noecho:  
                     46:                        0=ask once, echo. 
                     47:                        1=ask once, no echo. 
                     48:                        2=ask twice, no echo.
                     49:        Return 0 if no characters are input, else return 1.
                     50:        If we return 0, the hashed key will not be useful.
                     51: */
                     52: int getideakey(char *keystring, char *hash, boolean noecho)
                     53: {      char keystr2[MAXKEYLEN+2];
                     54:        int len;
                     55: 
                     56:        if (showpass)
                     57:                noecho = 0;
                     58:        while (TRUE) {
                     59:                fprintf(pgpout,PSTR("\nEnter pass phrase: "));
                     60:                getstring(keystring,MAXKEYLEN-1,!noecho);
                     61:                if (noecho<2)   /* no need to ask again if user can see it */
                     62:                        break;
                     63:                fprintf(pgpout,PSTR("\nEnter same pass phrase again: "));
                     64:                getstring(keystr2,MAXKEYLEN-1,!noecho);
                     65:                if (strcmp(keystring,keystr2)==0)
                     66:                        break;
                     67:                fprintf(pgpout,PSTR("\n\007Error: Pass phrases were different.  Try again."));
                     68:        }
                     69: 
                     70:        len = strlen(keystring);
                     71:        if (len == 0)
                     72:                return 0;
                     73:        INTERNAL(keystring);
                     74:        hashpass (keystring, strlen(keystring), (byte *) hash);
                     75:        return 1;
                     76: }      /* getideakey */
                     77: 

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