1 /* $OpenBSD: x_bignum.c,v 1.12 2022/07/30 13:42:25 jsing Exp $ */ 2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL 3 * project 2000. 4 */ 5 /* ==================================================================== 6 * Copyright (c) 2000 The OpenSSL Project. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in 17 * the documentation and/or other materials provided with the 18 * distribution. 19 * 20 * 3. All advertising materials mentioning features or use of this 21 * software must display the following acknowledgment: 22 * "This product includes software developed by the OpenSSL Project 23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" 24 * 25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 26 * endorse or promote products derived from this software without 27 * prior written permission. For written permission, please contact 28 * licensing@OpenSSL.org. 29 * 30 * 5. Products derived from this software may not be called "OpenSSL" 31 * nor may "OpenSSL" appear in their names without prior written 32 * permission of the OpenSSL Project. 33 * 34 * 6. Redistributions of any form whatsoever must retain the following 35 * acknowledgment: 36 * "This product includes software developed by the OpenSSL Project 37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 50 * OF THE POSSIBILITY OF SUCH DAMAGE. 51 * ==================================================================== 52 * 53 * This product includes cryptographic software written by Eric Young 54 * (eay@cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh@cryptsoft.com). 56 * 57 */ 58 59 #include <stdio.h> 60 61 #include <openssl/asn1t.h> 62 #include <openssl/bn.h> 63 64 #include "asn1_locl.h" 65 #include "bytestring.h" 66 67 /* 68 * Custom primitive type for that reads an ASN.1 INTEGER into a BIGNUM. 69 */ 70 71 static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it); 72 static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it); 73 static void bn_clear(ASN1_VALUE **pval, const ASN1_ITEM *it); 74 75 static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, 76 const ASN1_ITEM *it); 77 static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, 78 int utype, char *free_cont, const ASN1_ITEM *it); 79 static int bn_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it, 80 int indent, const ASN1_PCTX *pctx); 81 82 static ASN1_PRIMITIVE_FUNCS bignum_pf = { 83 .app_data = NULL, 84 .flags = 0, 85 .prim_new = bn_new, 86 .prim_free = bn_free, 87 .prim_clear = bn_clear, 88 .prim_c2i = bn_c2i, 89 .prim_i2c = bn_i2c, 90 .prim_print = bn_print, 91 }; 92 93 const ASN1_ITEM BIGNUM_it = { 94 .itype = ASN1_ITYPE_PRIMITIVE, 95 .utype = V_ASN1_INTEGER, 96 .templates = NULL, 97 .tcount = 0, 98 .funcs = &bignum_pf, 99 .size = 0, 100 .sname = "BIGNUM", 101 }; 102 103 const ASN1_ITEM CBIGNUM_it = { 104 .itype = ASN1_ITYPE_PRIMITIVE, 105 .utype = V_ASN1_INTEGER, 106 .templates = NULL, 107 .tcount = 0, 108 .funcs = &bignum_pf, 109 .size = 0, 110 .sname = "BIGNUM", 111 }; 112 113 static int 114 bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it) 115 { 116 if ((*pval = (ASN1_VALUE *)BN_new()) == NULL) 117 return 0; 118 119 return 1; 120 } 121 122 static void 123 bn_clear(ASN1_VALUE **pval, const ASN1_ITEM *it) 124 { 125 BN_free((BIGNUM *)*pval); 126 *pval = NULL; 127 } 128 129 static void 130 bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 131 { 132 if (*pval == NULL) 133 return; 134 135 bn_clear(pval, it); 136 } 137 138 static int 139 bn_i2c(ASN1_VALUE **pval, unsigned char *content, int *putype, const ASN1_ITEM *it) 140 { 141 ASN1_INTEGER *aint = NULL; 142 unsigned char **pp = NULL; 143 const BIGNUM *bn; 144 int ret; 145 146 if (*pval == NULL) 147 return -1; 148 149 bn = (const BIGNUM *)*pval; 150 151 if ((aint = BN_to_ASN1_INTEGER(bn, NULL)) == NULL) 152 return -1; 153 154 if (content != NULL) 155 pp = &content; 156 157 ret = i2c_ASN1_INTEGER(aint, pp); 158 159 ASN1_INTEGER_free(aint); 160 161 return ret; 162 } 163 164 static int 165 bn_c2i(ASN1_VALUE **pval, const unsigned char *content, int len, int utype, 166 char *free_content, const ASN1_ITEM *it) 167 { 168 ASN1_INTEGER *aint = NULL; 169 BIGNUM *bn; 170 CBS cbs; 171 int ret = 0; 172 173 bn_clear(pval, it); 174 175 if (len < 0) 176 goto err; 177 CBS_init(&cbs, content, len); 178 if (!c2i_ASN1_INTEGER_cbs(&aint, &cbs)) 179 goto err; 180 181 if ((bn = ASN1_INTEGER_to_BN(aint, NULL)) == NULL) 182 goto err; 183 *pval = (ASN1_VALUE *)bn; 184 185 ret = 1; 186 187 err: 188 ASN1_INTEGER_free(aint); 189 190 return ret; 191 } 192 193 static int 194 bn_print(BIO *out, ASN1_VALUE **pval, const ASN1_ITEM *it, int indent, 195 const ASN1_PCTX *pctx) 196 { 197 const BIGNUM *bn = (BIGNUM *)*pval; 198 199 if (!BN_print(out, bn)) 200 return 0; 201 if (BIO_printf(out, "\n") <= 0) 202 return 0; 203 204 return 1; 205 } 206