mirror of git://git.gnupg.org/gnupg.git
146 lines
4.1 KiB
C
146 lines
4.1 KiB
C
/* sexputil.c - Utility functions for S-expressions.
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* Copyright (C) 2005 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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/* This file implements a few utility functions useful when working
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with canonical encrypted S-expresions (i.e. not the S-exprssion
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objects from libgcrypt). */
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#ifdef HAVE_LOCALE_H
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#include <locale.h>
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#endif
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#include "util.h"
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#include "sexp-parse.h"
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/* Return the so called "keygrip" which is the SHA-1 hash of the
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public key parameters expressed in a way depended on the algorithm.
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KEY is expected to be an canonical encoded S-expression with a
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public or private key. KEYLEN is the length of that buffer.
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GRIP must be at least 20 bytes long On success 0 is return, on
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error an aerror code. */
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gpg_error_t
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keygrip_from_canon_sexp (const unsigned char *key, size_t keylen,
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unsigned char *grip)
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{
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gpg_error_t err;
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gcry_sexp_t sexp;
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if (!grip)
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return gpg_error (GPG_ERR_INV_VALUE);
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err = gcry_sexp_sscan (&sexp, NULL, (const char *)key, keylen);
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if (err)
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return err;
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if (!gcry_pk_get_keygrip (sexp, grip))
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err = gpg_error (GPG_ERR_INTERNAL);
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gcry_sexp_release (sexp);
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return err;
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}
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/* Compare two simple S-expressions like "(3:foo)". Returns 0 if they
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are identical or !0 if they are not. Not that this function can't
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be used for sorting. */
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int
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cmp_simple_canon_sexp (const unsigned char *a_orig,
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const unsigned char *b_orig)
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{
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const char *a = (const char *)a_orig;
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const char *b = (const char *)b_orig;
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unsigned long n1, n2;
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char *endp;
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if (!a && !b)
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return 0; /* Both are NULL, they are identical. */
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if (!a || !b)
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return 1; /* One is NULL, they are not identical. */
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if (*a != '(' || *b != '(')
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log_bug ("invalid S-exp in cmp_simple_canon_sexp\n");
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a++;
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n1 = strtoul (a, &endp, 10);
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a = endp;
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b++;
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n2 = strtoul (b, &endp, 10);
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b = endp;
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if (*a != ':' || *b != ':' )
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log_bug ("invalid S-exp in cmp_simple_canon_sexp\n");
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if (n1 != n2)
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return 1; /* Not the same. */
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for (a++, b++; n1; n1--, a++, b++)
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if (*a != *b)
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return 1; /* Not the same. */
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return 0;
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}
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/* Create a simple S-expression from the hex string at LIBNE. Returns
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a newly allocated buffer with that canonical encoded S-expression
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or NULL in case of an error. On return the number of characters
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scanned in LINE will be stored at NSCANNED. This fucntions stops
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converting at the first character not representing a hexdigit. Odd
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numbers of hex digits are allowed; a leading zero is then
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assumed. If no characters have been found, NULL is returned.*/
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unsigned char *
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make_simple_sexp_from_hexstr (const char *line, size_t *nscanned)
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{
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size_t n, len;
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const char *s;
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unsigned char *buf;
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unsigned char *p;
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char numbuf[50], *numbufp;
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size_t numbuflen;
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for (n=0, s=line; hexdigitp (s); s++, n++)
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;
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if (nscanned)
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*nscanned = n;
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if (!n)
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return NULL;
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len = ((n+1) & ~0x01)/2;
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numbufp = smklen (numbuf, sizeof numbuf, len, &numbuflen);
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buf = xtrymalloc (1 + numbuflen + len + 1 + 1);
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if (!buf)
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return NULL;
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buf[0] = '(';
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p = (unsigned char *)stpcpy ((char *)buf+1, numbufp);
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s = line;
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if ((n&1))
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{
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*p++ = xtoi_1 (s);
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s++;
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n--;
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}
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for (; n > 1; n -=2, s += 2)
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*p++ = xtoi_2 (s);
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*p++ = ')';
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*p = 0; /* (Not really neaded.) */
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return buf;
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}
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