477 lines
13 KiB
C
477 lines
13 KiB
C
// Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) All rights reserved.
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// SPDX-License-Identifier: Apache-2.0
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#include <ctype.h>
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#include <string.h>
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#include <openssl/asn1.h>
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#include <openssl/asn1t.h>
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#include <openssl/buf.h>
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#include <openssl/err.h>
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#include <openssl/mem.h>
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#include <openssl/obj.h>
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#include <openssl/stack.h>
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#include <openssl/x509.h>
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#include "../asn1/internal.h"
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#include "../internal.h"
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#include "internal.h"
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typedef STACK_OF(X509_NAME_ENTRY) STACK_OF_X509_NAME_ENTRY;
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DEFINE_STACK_OF(STACK_OF_X509_NAME_ENTRY)
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// Maximum length of X509_NAME: much larger than anything we should
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// ever see in practice.
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#define X509_NAME_MAX (1024 * 1024)
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static int x509_name_ex_d2i(ASN1_VALUE **val, const unsigned char **in,
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long len, const ASN1_ITEM *it, int tag, int aclass,
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char opt, ASN1_TLC *ctx);
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static int x509_name_ex_i2d(ASN1_VALUE **val, unsigned char **out,
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const ASN1_ITEM *it, int tag, int aclass);
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static int x509_name_ex_new(ASN1_VALUE **val, const ASN1_ITEM *it);
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static void x509_name_ex_free(ASN1_VALUE **val, const ASN1_ITEM *it);
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static int x509_name_encode(X509_NAME *a);
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static int x509_name_canon(X509_NAME *a);
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static int asn1_string_canon(ASN1_STRING *out, ASN1_STRING *in);
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static int i2d_name_canon(STACK_OF(STACK_OF_X509_NAME_ENTRY) *intname,
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unsigned char **in);
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ASN1_SEQUENCE(X509_NAME_ENTRY) = {
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ASN1_SIMPLE(X509_NAME_ENTRY, object, ASN1_OBJECT),
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ASN1_SIMPLE(X509_NAME_ENTRY, value, ASN1_PRINTABLE),
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} ASN1_SEQUENCE_END(X509_NAME_ENTRY)
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IMPLEMENT_ASN1_FUNCTIONS_const(X509_NAME_ENTRY)
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IMPLEMENT_ASN1_DUP_FUNCTION_const(X509_NAME_ENTRY)
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// For the "Name" type we need a SEQUENCE OF { SET OF X509_NAME_ENTRY } so
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// declare two template wrappers for this
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ASN1_ITEM_TEMPLATE(X509_NAME_ENTRIES) = ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SET_OF,
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0, RDNS,
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X509_NAME_ENTRY)
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ASN1_ITEM_TEMPLATE_END(X509_NAME_ENTRIES)
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ASN1_ITEM_TEMPLATE(X509_NAME_INTERNAL) =
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ASN1_EX_TEMPLATE_TYPE(ASN1_TFLG_SEQUENCE_OF, 0, Name, X509_NAME_ENTRIES)
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ASN1_ITEM_TEMPLATE_END(X509_NAME_INTERNAL)
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// Normally that's where it would end: we'd have two nested STACK structures
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// representing the ASN1. Unfortunately X509_NAME uses a completely different
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// form and caches encodings so we have to process the internal form and
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// convert to the external form.
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static const ASN1_EXTERN_FUNCS x509_name_ff = {
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NULL,
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x509_name_ex_new,
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x509_name_ex_free,
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x509_name_ex_d2i,
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x509_name_ex_i2d,
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NULL,
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};
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IMPLEMENT_EXTERN_ASN1(X509_NAME, V_ASN1_SEQUENCE, x509_name_ff)
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IMPLEMENT_ASN1_FUNCTIONS(X509_NAME)
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IMPLEMENT_ASN1_DUP_FUNCTION(X509_NAME)
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static int x509_name_ex_new(ASN1_VALUE **val, const ASN1_ITEM *it) {
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X509_NAME *ret = NULL;
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ret = OPENSSL_malloc(sizeof(X509_NAME));
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if (!ret) {
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goto memerr;
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}
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if ((ret->entries = sk_X509_NAME_ENTRY_new_null()) == NULL) {
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goto memerr;
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}
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if ((ret->bytes = BUF_MEM_new()) == NULL) {
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goto memerr;
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}
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ret->canon_enc = NULL;
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ret->canon_enclen = 0;
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ret->modified = 1;
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*val = (ASN1_VALUE *)ret;
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return 1;
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memerr:
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if (ret) {
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if (ret->entries) {
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sk_X509_NAME_ENTRY_free(ret->entries);
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}
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OPENSSL_free(ret);
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}
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return 0;
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}
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static void x509_name_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it) {
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X509_NAME *a;
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if (!pval || !*pval) {
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return;
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}
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a = (X509_NAME *)*pval;
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BUF_MEM_free(a->bytes);
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sk_X509_NAME_ENTRY_pop_free(a->entries, X509_NAME_ENTRY_free);
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if (a->canon_enc) {
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OPENSSL_free(a->canon_enc);
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}
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OPENSSL_free(a);
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*pval = NULL;
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}
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static void local_sk_X509_NAME_ENTRY_free(STACK_OF(X509_NAME_ENTRY) *ne) {
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sk_X509_NAME_ENTRY_free(ne);
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}
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static void local_sk_X509_NAME_ENTRY_pop_free(STACK_OF(X509_NAME_ENTRY) *ne) {
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sk_X509_NAME_ENTRY_pop_free(ne, X509_NAME_ENTRY_free);
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}
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static int x509_name_ex_d2i(ASN1_VALUE **val, const unsigned char **in,
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long len, const ASN1_ITEM *it, int tag, int aclass,
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char opt, ASN1_TLC *ctx) {
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const unsigned char *p = *in, *q;
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STACK_OF(STACK_OF_X509_NAME_ENTRY) *intname = NULL;
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X509_NAME *nm = NULL;
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size_t i, j;
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int ret;
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STACK_OF(X509_NAME_ENTRY) *entries;
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X509_NAME_ENTRY *entry;
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// Bound the size of an X509_NAME we are willing to parse.
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if (len > X509_NAME_MAX) {
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len = X509_NAME_MAX;
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}
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q = p;
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// Get internal representation of Name
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ASN1_VALUE *intname_val = NULL;
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ret = ASN1_item_ex_d2i(&intname_val, &p, len,
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ASN1_ITEM_rptr(X509_NAME_INTERNAL), tag, aclass, opt,
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ctx);
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if (ret <= 0) {
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return ret;
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}
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intname = (STACK_OF(STACK_OF_X509_NAME_ENTRY) *)intname_val;
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if (*val) {
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x509_name_ex_free(val, NULL);
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}
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ASN1_VALUE *nm_val = NULL;
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if (!x509_name_ex_new(&nm_val, NULL)) {
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goto err;
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}
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nm = (X509_NAME *)nm_val;
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// We've decoded it: now cache encoding
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if (!BUF_MEM_grow(nm->bytes, p - q)) {
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goto err;
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}
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OPENSSL_memcpy(nm->bytes->data, q, p - q);
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// Convert internal representation to X509_NAME structure
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for (i = 0; i < sk_STACK_OF_X509_NAME_ENTRY_num(intname); i++) {
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entries = sk_STACK_OF_X509_NAME_ENTRY_value(intname, i);
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for (j = 0; j < sk_X509_NAME_ENTRY_num(entries); j++) {
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entry = sk_X509_NAME_ENTRY_value(entries, j);
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entry->set = (int)i;
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if (!sk_X509_NAME_ENTRY_push(nm->entries, entry)) {
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goto err;
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}
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(void)sk_X509_NAME_ENTRY_set(entries, j, NULL);
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}
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}
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ret = x509_name_canon(nm);
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if (!ret) {
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goto err;
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}
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sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname, local_sk_X509_NAME_ENTRY_free);
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nm->modified = 0;
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*val = (ASN1_VALUE *)nm;
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*in = p;
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return ret;
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err:
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X509_NAME_free(nm);
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sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname,
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local_sk_X509_NAME_ENTRY_pop_free);
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OPENSSL_PUT_ERROR(X509, ERR_R_ASN1_LIB);
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return 0;
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}
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static int x509_name_ex_i2d(ASN1_VALUE **val, unsigned char **out,
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const ASN1_ITEM *it, int tag, int aclass) {
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X509_NAME *a = (X509_NAME *)*val;
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if (a->modified && (!x509_name_encode(a) || !x509_name_canon(a))) {
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return -1;
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}
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int ret = a->bytes->length;
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if (out != NULL) {
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OPENSSL_memcpy(*out, a->bytes->data, ret);
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*out += ret;
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}
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return ret;
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}
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static int x509_name_encode(X509_NAME *a) {
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int len;
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unsigned char *p;
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STACK_OF(X509_NAME_ENTRY) *entries = NULL;
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X509_NAME_ENTRY *entry;
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int set = -1;
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size_t i;
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STACK_OF(STACK_OF_X509_NAME_ENTRY) *intname =
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sk_STACK_OF_X509_NAME_ENTRY_new_null();
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if (!intname) {
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goto err;
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}
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for (i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++) {
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entry = sk_X509_NAME_ENTRY_value(a->entries, i);
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if (entry->set != set) {
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entries = sk_X509_NAME_ENTRY_new_null();
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if (!entries) {
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goto err;
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}
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if (!sk_STACK_OF_X509_NAME_ENTRY_push(intname, entries)) {
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sk_X509_NAME_ENTRY_free(entries);
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goto err;
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}
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set = entry->set;
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}
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if (!sk_X509_NAME_ENTRY_push(entries, entry)) {
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goto err;
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}
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}
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ASN1_VALUE *intname_val = (ASN1_VALUE *)intname;
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len = ASN1_item_ex_i2d(&intname_val, NULL, ASN1_ITEM_rptr(X509_NAME_INTERNAL),
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/*tag=*/-1, /*aclass=*/0);
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if (len <= 0) {
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goto err;
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}
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if (!BUF_MEM_grow(a->bytes, len)) {
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goto err;
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}
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p = (unsigned char *)a->bytes->data;
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if (ASN1_item_ex_i2d(&intname_val, &p, ASN1_ITEM_rptr(X509_NAME_INTERNAL),
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/*tag=*/-1, /*aclass=*/0) <= 0) {
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goto err;
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}
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sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname, local_sk_X509_NAME_ENTRY_free);
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a->modified = 0;
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return 1;
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err:
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sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname, local_sk_X509_NAME_ENTRY_free);
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return 0;
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}
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// This function generates the canonical encoding of the Name structure. In
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// it all strings are converted to UTF8, leading, trailing and multiple
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// spaces collapsed, converted to lower case and the leading SEQUENCE header
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// removed. In future we could also normalize the UTF8 too. By doing this
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// comparison of Name structures can be rapidly perfomed by just using
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// OPENSSL_memcmp() of the canonical encoding. By omitting the leading SEQUENCE
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// name constraints of type dirName can also be checked with a simple
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// OPENSSL_memcmp().
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static int x509_name_canon(X509_NAME *a) {
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unsigned char *p;
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STACK_OF(STACK_OF_X509_NAME_ENTRY) *intname = NULL;
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STACK_OF(X509_NAME_ENTRY) *entries = NULL;
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X509_NAME_ENTRY *entry, *tmpentry = NULL;
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int set = -1, ret = 0, len;
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size_t i;
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if (a->canon_enc) {
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OPENSSL_free(a->canon_enc);
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a->canon_enc = NULL;
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}
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// Special case: empty X509_NAME => null encoding
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if (sk_X509_NAME_ENTRY_num(a->entries) == 0) {
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a->canon_enclen = 0;
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return 1;
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}
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intname = sk_STACK_OF_X509_NAME_ENTRY_new_null();
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if (!intname) {
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goto err;
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}
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for (i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++) {
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entry = sk_X509_NAME_ENTRY_value(a->entries, i);
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if (entry->set != set) {
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entries = sk_X509_NAME_ENTRY_new_null();
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if (!entries) {
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goto err;
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}
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if (!sk_STACK_OF_X509_NAME_ENTRY_push(intname, entries)) {
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sk_X509_NAME_ENTRY_free(entries);
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goto err;
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}
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set = entry->set;
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}
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tmpentry = X509_NAME_ENTRY_new();
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if (tmpentry == NULL) {
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goto err;
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}
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tmpentry->object = OBJ_dup(entry->object);
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if (!asn1_string_canon(tmpentry->value, entry->value)) {
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goto err;
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}
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if (!sk_X509_NAME_ENTRY_push(entries, tmpentry)) {
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goto err;
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}
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tmpentry = NULL;
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}
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// Finally generate encoding
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len = i2d_name_canon(intname, NULL);
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if (len < 0) {
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goto err;
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}
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a->canon_enclen = len;
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p = OPENSSL_malloc(a->canon_enclen);
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if (!p) {
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goto err;
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}
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a->canon_enc = p;
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i2d_name_canon(intname, &p);
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ret = 1;
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err:
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if (tmpentry) {
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X509_NAME_ENTRY_free(tmpentry);
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}
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if (intname) {
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sk_STACK_OF_X509_NAME_ENTRY_pop_free(intname,
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local_sk_X509_NAME_ENTRY_pop_free);
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}
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return ret;
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}
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// Bitmap of all the types of string that will be canonicalized.
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#define ASN1_MASK_CANON \
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(B_ASN1_UTF8STRING | B_ASN1_BMPSTRING | B_ASN1_UNIVERSALSTRING | \
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B_ASN1_PRINTABLESTRING | B_ASN1_T61STRING | B_ASN1_IA5STRING | \
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B_ASN1_VISIBLESTRING)
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static int asn1_string_canon(ASN1_STRING *out, ASN1_STRING *in) {
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unsigned char *to, *from;
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int len, i;
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// If type not in bitmask just copy string across
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if (!(ASN1_tag2bit(in->type) & ASN1_MASK_CANON)) {
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if (!ASN1_STRING_copy(out, in)) {
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return 0;
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}
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return 1;
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}
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out->type = V_ASN1_UTF8STRING;
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out->length = ASN1_STRING_to_UTF8(&out->data, in);
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if (out->length == -1) {
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return 0;
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}
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to = out->data;
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from = to;
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len = out->length;
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// Convert string in place to canonical form.
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// Ignore leading spaces
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while ((len > 0) && OPENSSL_isspace(*from)) {
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from++;
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len--;
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}
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to = from + len;
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// Ignore trailing spaces
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while ((len > 0) && OPENSSL_isspace(to[-1])) {
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to--;
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len--;
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}
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to = out->data;
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i = 0;
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while (i < len) {
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// Collapse multiple spaces
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if (OPENSSL_isspace(*from)) {
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// Copy one space across
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*to++ = ' ';
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// Ignore subsequent spaces. Note: don't need to check len here
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// because we know the last character is a non-space so we can't
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// overflow.
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do {
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from++;
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i++;
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} while (OPENSSL_isspace(*from));
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} else {
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*to++ = OPENSSL_tolower(*from);
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from++;
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i++;
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}
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}
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out->length = to - out->data;
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return 1;
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}
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static int i2d_name_canon(STACK_OF(STACK_OF_X509_NAME_ENTRY) *_intname,
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unsigned char **in) {
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int len, ltmp;
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size_t i;
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ASN1_VALUE *v;
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STACK_OF(ASN1_VALUE) *intname = (STACK_OF(ASN1_VALUE) *)_intname;
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len = 0;
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for (i = 0; i < sk_ASN1_VALUE_num(intname); i++) {
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v = sk_ASN1_VALUE_value(intname, i);
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ltmp = ASN1_item_ex_i2d(&v, in, ASN1_ITEM_rptr(X509_NAME_ENTRIES),
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/*tag=*/-1, /*aclass=*/0);
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if (ltmp < 0) {
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return ltmp;
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}
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len += ltmp;
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}
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return len;
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}
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int X509_NAME_set(X509_NAME **xn, X509_NAME *name) {
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if ((name = X509_NAME_dup(name)) == NULL) {
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return 0;
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}
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X509_NAME_free(*xn);
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*xn = name;
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return 1;
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}
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int X509_NAME_ENTRY_set(const X509_NAME_ENTRY *ne) { return ne->set; }
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int X509_NAME_get0_der(X509_NAME *nm, const unsigned char **out_der,
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size_t *out_der_len) {
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// Make sure encoding is valid
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if (i2d_X509_NAME(nm, NULL) <= 0) {
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return 0;
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}
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if (out_der != NULL) {
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*out_der = (unsigned char *)nm->bytes->data;
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}
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if (out_der_len != NULL) {
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*out_der_len = nm->bytes->length;
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}
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return 1;
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}
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