146 lines
3.9 KiB
C
146 lines
3.9 KiB
C
/*
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* Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdio.h>
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#include "internal/cryptlib.h"
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#include <openssl/asn1t.h>
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#include <openssl/bn.h>
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/*
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* Custom primitive type for long handling. This converts between an
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* ASN1_INTEGER and a long directly.
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*/
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static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it);
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static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it);
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static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
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const ASN1_ITEM *it);
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static int long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
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int utype, char *free_cont, const ASN1_ITEM *it);
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static int long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it,
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int indent, const ASN1_PCTX *pctx);
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static ASN1_PRIMITIVE_FUNCS long_pf = {
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NULL, 0,
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long_new,
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long_free,
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long_free, /* Clear should set to initial value */
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long_c2i,
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long_i2c,
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long_print
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};
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ASN1_ITEM_start(LONG)
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ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, ASN1_LONG_UNDEF, "LONG"
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ASN1_ITEM_end(LONG)
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ASN1_ITEM_start(ZLONG)
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ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &long_pf, 0, "ZLONG"
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ASN1_ITEM_end(ZLONG)
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static int long_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
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{
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*(long *)pval = it->size;
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return 1;
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}
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static void long_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
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{
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*(long *)pval = it->size;
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}
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static int long_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype,
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const ASN1_ITEM *it)
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{
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long ltmp;
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unsigned long utmp;
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int clen, pad, i;
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/* this exists to bypass broken gcc optimization */
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char *cp = (char *)pval;
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/* use memcpy, because we may not be long aligned */
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memcpy(<mp, cp, sizeof(long));
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if (ltmp == it->size)
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return -1;
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/*
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* Convert the long to positive: we subtract one if negative so we can
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* cleanly handle the padding if only the MSB of the leading octet is
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* set.
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*/
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if (ltmp < 0)
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utmp = 0 - (unsigned long)ltmp - 1;
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else
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utmp = ltmp;
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clen = BN_num_bits_word(utmp);
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/* If MSB of leading octet set we need to pad */
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if (!(clen & 0x7))
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pad = 1;
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else
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pad = 0;
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/* Convert number of bits to number of octets */
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clen = (clen + 7) >> 3;
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if (cont) {
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if (pad)
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*cont++ = (ltmp < 0) ? 0xff : 0;
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for (i = clen - 1; i >= 0; i--) {
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cont[i] = (unsigned char)(utmp & 0xff);
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if (ltmp < 0)
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cont[i] ^= 0xff;
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utmp >>= 8;
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}
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}
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return clen + pad;
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}
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static int long_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
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int utype, char *free_cont, const ASN1_ITEM *it)
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{
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int neg, i;
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long ltmp;
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unsigned long utmp = 0;
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char *cp = (char *)pval;
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if (len > (int)sizeof(long)) {
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ASN1err(ASN1_F_LONG_C2I, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG);
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return 0;
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}
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/* Is it negative? */
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if (len && (cont[0] & 0x80))
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neg = 1;
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else
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neg = 0;
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utmp = 0;
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for (i = 0; i < len; i++) {
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utmp <<= 8;
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if (neg)
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utmp |= cont[i] ^ 0xff;
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else
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utmp |= cont[i];
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}
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ltmp = (long)utmp;
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if (neg) {
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ltmp = -ltmp;
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ltmp--;
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}
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if (ltmp == it->size) {
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ASN1err(ASN1_F_LONG_C2I, ASN1_R_INTEGER_TOO_LARGE_FOR_LONG);
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return 0;
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}
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memcpy(cp, <mp, sizeof(long));
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return 1;
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}
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static int long_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it,
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int indent, const ASN1_PCTX *pctx)
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{
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return BIO_printf(out, "%ld\n", *(long *)pval);
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}
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