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Annotation of pgp/src/passwd.c, revision 1.1.1.2

1.1.1.2 ! 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: **     GetHashedPassPhrase - 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 GetHashedPassPhrase(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:        if (noecho && filter_mode)
        !            70:                putc('\n', pgpout);
        !            71: 
        !            72:        len = strlen(keystring);
        !            73:        if (len == 0)
        !            74:                return 0;
        !            75:        /* We assume ASCII pass phrases, with no charset conversions. */
        !            76:        hashpass (keystring, strlen(keystring), (byte *) hash);
        !            77:        return 1;
        !            78: }      /* GetHashedPassPhrase */
        !            79: 

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