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Annotation of pgp/src/passwd.c, revision 1.1.1.6

1.1.1.6 ! root        1: /*     passwd.c - Password reading/hashing routines
        !             2:        Implemented in Microsoft C.
        !             3:        Routines for getting a pass phrase from the user's console.
        !             4: 
        !             5:        (c) Copyright 1990-1994 by Philip Zimmermann.  All rights reserved.
        !             6:        The author assumes no liability for damages resulting from the use
        !             7:        of this software, even if the damage results from defects in this
        !             8:        software.  No warranty is expressed or implied.
        !             9: 
        !            10:        Note that while most PGP source modules bear Philip Zimmermann's
        !            11:        copyright notice, many of them have been revised or entirely written
        !            12:        by contributors who frequently failed to put their names in their
        !            13:        code.  Code that has been incorporated into PGP from other authors
        !            14:        was either originally published in the public domain or is used with
        !            15:        permission from the various authors.
        !            16: 
        !            17:        PGP is available for free to the public under certain restrictions.
        !            18:        See the PGP User's Guide (included in the release package) for
        !            19:        important information about licensing, patent restrictions on
        !            20:        certain algorithms, trademarks, copyrights, and export controls.
        !            21: */
        !            22: 
        !            23: #include       <stdio.h>       /* for fprintf() */
        !            24: #include       <ctype.h>       /* for isdigit(), toupper(), etc. */
        !            25: #include       <string.h>      /* for strlen() */
        !            26: 
        !            27: #include       "random.h"      /* for getstring() */
        !            28: #include       "md5.h"
        !            29: #include       "language.h"
        !            30: #include       "pgp.h"
        !            31: 
        !            32: #define MAXKEYLEN 254  /* max byte length of pass phrase */
        !            33: 
        !            34: boolean showpass = FALSE;
        !            35: 
        !            36: /*
        !            37: **     hashpass - Hash pass phrase down to 128 bits (16 bytes).
        !            38: **  keylen must be less than 1024.
        !            39: **     Use the MD5 algorithm.
        !            40: */
        !            41: void hashpass (char *keystring, int keylen, byte *hash)
        !            42: {
        !            43:        struct MD5Context mdContext;
        !            44: 
        !            45:        /* Calculate the hash */
        !            46:        MD5Init(&mdContext);
        !            47:        MD5Update(&mdContext, (unsigned char *) keystring, keylen);
        !            48:        MD5Final(hash, &mdContext);
        !            49: } /* hashpass */
        !            50: 
        !            51: 
        !            52: /*
        !            53: **     GetHashedPassPhrase - get pass phrase from user,
        !            54:                 hashes it to an IDEA key.
        !            55:        Parameters:
        !            56:                returns char *keystring as the pass phrase itself
        !            57:                return char *hash as the 16-byte hash of the pass phrase
        !            58:                                using MD5.
        !            59:                byte noecho:  
        !            60:                        0=ask once, echo. 
        !            61:                        1=ask once, no echo. 
        !            62:                        2=ask twice, no echo.
        !            63:        Return 0 if no characters are input, else return 1.
        !            64:        If we return 0, the hashed key will not be useful.
        !            65: */
        !            66: int GetHashedPassPhrase(char *hash, boolean noecho)
        !            67: {      char keystr1[MAXKEYLEN+2], keystr2[MAXKEYLEN+2];
        !            68:        int len;
        !            69: 
        !            70:        if (showpass)
        !            71:                noecho = 0;
        !            72:        for (;;) {
        !            73:                fprintf(pgpout,LANG("\nEnter pass phrase: "));
        !            74:                getstring(keystr1,MAXKEYLEN-1,!noecho);
        !            75:                if (noecho<2)   /* no need to ask again if user can see it */
        !            76:                        break;
        !            77:                fprintf(pgpout,LANG("\nEnter same pass phrase again: "));
        !            78:                getstring(keystr2,MAXKEYLEN-1,!noecho);
        !            79:                if (strcmp(keystr1,keystr2)==0)
        !            80:                        break;
        !            81:                fprintf(pgpout,LANG("\n\007Error: Pass phrases were different.  Try again."));
        !            82:                memset(keystr2, 0, sizeof(keystr2));
        !            83:        }
        !            84:        if (noecho && (filter_mode || quietmode))
        !            85:                putc('\n', pgpout);
        !            86: 
        !            87:        len = strlen(keystr1);
        !            88:        if (len == 0)
        !            89:                return 0;
        !            90:        /* We assume ASCII pass phrases, with no charset conversions. */
        !            91:        /* This will have to change for EBCDIC */
        !            92:        hashpass (keystr1, strlen(keystr1), (byte *) hash);
        !            93:        memset(keystr1, 0, sizeof(keystr1));
        !            94:        return 1;
        !            95: } /* GetHashedPassPhrase */
        !            96: 

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