diff options
Diffstat (limited to 'openssl/crypto/asn1/x_long.c')
| -rw-r--r-- | openssl/crypto/asn1/x_long.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/openssl/crypto/asn1/x_long.c b/openssl/crypto/asn1/x_long.c new file mode 100644 index 000000000..bf35457c1 --- /dev/null +++ b/openssl/crypto/asn1/x_long.c @@ -0,0 +1,171 @@ +/* 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; +} |