/* x_long.c */ /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL * project 2000. */ /* ==================================================================== * Copyright (c) 2000 The OpenSSL Project. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. All advertising materials mentioning features or use of this * software must display the following acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" * * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to * endorse or promote products derived from this software without * prior written permission. For written permission, please contact * licensing@OpenSSL.org. * * 5. Products derived from this software may not be called "OpenSSL" * nor may "OpenSSL" appear in their names without prior written * permission of the OpenSSL Project. * * 6. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" * * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== * * This product includes cryptographic software written by Eric Young * (eay@cryptsoft.com). This product includes software written by Tim * Hudson (tjh@cryptsoft.com). * */ #include <stdio.h> #include "cryptlib.h" #include <openssl/asn1t.h> #include <openssl/bn.h> /* Custom primitive type for long handling. This converts between an ASN1_INTEGER * and a long directly. */ static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it); static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it); static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it); static int long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it); static ASN1_PRIMITIVE_FUNCS long_pf = { NULL, 0, long_new, long_free, long_free, /* Clear should set to initial value */ long_c2i, long_i2c }; ASN1_ITEM_start(LONG) ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, ASN1_LONG_UNDEF, "LONG" ASN1_ITEM_end(LONG) ASN1_ITEM_start(ZLONG) ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, 0, "ZLONG" ASN1_ITEM_end(ZLONG) static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it) { *(long *)pval = it->size; return 1; } static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it) { *(long *)pval = it->size; } static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it) { long ltmp; unsigned long utmp; int clen, pad, i; /* this exists to bypass broken gcc optimization */ char *cp = (char *)pval; /* use memcpy, because we may not be long aligned */ memcpy(<mp, cp, sizeof(long)); if(ltmp == it->size) return -1; /* Convert the long to positive: we subtract one if negative so * we can cleanly handle the padding if only the MSB of the leading * octet is set. */ if(ltmp < 0) utmp = -ltmp - 1; else utmp = ltmp; clen = BN_num_bits_word(utmp); /* If MSB of leading octet set we need to pad */ if(!(clen & 0x7)) pad = 1; else pad = 0; /* Convert number of bits to number of octets */ clen = (clen + 7) >> 3; if(cont) { if(pad) *cont++ = (ltmp < 0) ? 0xff : 0; for(i = clen - 1; i >= 0; i--) { cont[i] = (unsigned char)(utmp & 0xff); if(ltmp < 0) cont[i] ^= 0xff; utmp >>= 8; } } return clen + pad; } static int long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it) { int neg, i; long ltmp; unsigned long utmp = 0; char *cp = (char *)pval; if(len > (int)sizeof(long)) { ASN1err(ASN1_F_LONG_C2I, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG); return 0; } /* Is it negative? */ if(len && (cont[0] & 0x80)) neg = 1; else neg = 0; utmp = 0; for(i = 0; i < len; i++) { utmp <<= 8; if(neg) utmp |= cont[i] ^ 0xff; else utmp |= cont[i]; } ltmp = (long)utmp; if(neg) { ltmp++; ltmp = -ltmp; } if(ltmp == it->size) { ASN1err(ASN1_F_LONG_C2I, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG); return 0; } memcpy(cp, <mp, sizeof(long)); return 1; }