/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * 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 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 acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS 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 AUTHOR OR 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.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.] */

#include <openssl/asn1.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/obj.h>
#include <openssl/stack.h>
#include <openssl/x509.h>

#include "../asn1/internal.h"
#include "internal.h"


int X509at_get_attr_count(const STACK_OF(X509_ATTRIBUTE) *x) {
  return sk_X509_ATTRIBUTE_num(x);
}

int X509at_get_attr_by_NID(const STACK_OF(X509_ATTRIBUTE) *x, int nid,
                           int lastpos) {
  const ASN1_OBJECT *obj = OBJ_nid2obj(nid);
  if (obj == NULL) {
    return -1;
  }
  return X509at_get_attr_by_OBJ(x, obj, lastpos);
}

int X509at_get_attr_by_OBJ(const STACK_OF(X509_ATTRIBUTE) *sk,
                           const ASN1_OBJECT *obj, int lastpos) {
  int n;
  X509_ATTRIBUTE *ex;

  if (sk == NULL) {
    return -1;
  }
  lastpos++;
  if (lastpos < 0) {
    lastpos = 0;
  }
  n = sk_X509_ATTRIBUTE_num(sk);
  for (; lastpos < n; lastpos++) {
    ex = sk_X509_ATTRIBUTE_value(sk, lastpos);
    if (OBJ_cmp(ex->object, obj) == 0) {
      return lastpos;
    }
  }
  return -1;
}

X509_ATTRIBUTE *X509at_get_attr(const STACK_OF(X509_ATTRIBUTE) *x, int loc) {
  if (x == NULL || loc < 0 || sk_X509_ATTRIBUTE_num(x) <= (size_t)loc) {
    return NULL;
  } else {
    return sk_X509_ATTRIBUTE_value(x, loc);
  }
}

X509_ATTRIBUTE *X509at_delete_attr(STACK_OF(X509_ATTRIBUTE) *x, int loc) {
  X509_ATTRIBUTE *ret;

  if (x == NULL || loc < 0 || sk_X509_ATTRIBUTE_num(x) <= (size_t)loc) {
    return NULL;
  }
  ret = sk_X509_ATTRIBUTE_delete(x, loc);
  return ret;
}

STACK_OF(X509_ATTRIBUTE) *X509at_add1_attr(STACK_OF(X509_ATTRIBUTE) **x,
                                           X509_ATTRIBUTE *attr) {
  X509_ATTRIBUTE *new_attr = NULL;
  STACK_OF(X509_ATTRIBUTE) *sk = NULL;

  if (x == NULL) {
    OPENSSL_PUT_ERROR(X509, ERR_R_PASSED_NULL_PARAMETER);
    goto err;
  }

  if (*x == NULL) {
    if ((sk = sk_X509_ATTRIBUTE_new_null()) == NULL) {
      goto err;
    }
  } else {
    sk = *x;
  }

  if ((new_attr = X509_ATTRIBUTE_dup(attr)) == NULL) {
    goto err;
  }
  if (!sk_X509_ATTRIBUTE_push(sk, new_attr)) {
    goto err;
  }
  if (*x == NULL) {
    *x = sk;
  }
  return sk;
err:
  if (new_attr != NULL) {
    X509_ATTRIBUTE_free(new_attr);
  }
  if (sk != NULL) {
    sk_X509_ATTRIBUTE_free(sk);
  }
  return NULL;
}

STACK_OF(X509_ATTRIBUTE) *X509at_add1_attr_by_OBJ(STACK_OF(X509_ATTRIBUTE) **x,
                                                  const ASN1_OBJECT *obj,
                                                  int type,
                                                  const unsigned char *bytes,
                                                  int len) {
  X509_ATTRIBUTE *attr;
  STACK_OF(X509_ATTRIBUTE) *ret;
  attr = X509_ATTRIBUTE_create_by_OBJ(NULL, obj, type, bytes, len);
  if (!attr) {
    return 0;
  }
  ret = X509at_add1_attr(x, attr);
  X509_ATTRIBUTE_free(attr);
  return ret;
}

STACK_OF(X509_ATTRIBUTE) *X509at_add1_attr_by_NID(STACK_OF(X509_ATTRIBUTE) **x,
                                                  int nid, int type,
                                                  const unsigned char *bytes,
                                                  int len) {
  X509_ATTRIBUTE *attr;
  STACK_OF(X509_ATTRIBUTE) *ret;
  attr = X509_ATTRIBUTE_create_by_NID(NULL, nid, type, bytes, len);
  if (!attr) {
    return 0;
  }
  ret = X509at_add1_attr(x, attr);
  X509_ATTRIBUTE_free(attr);
  return ret;
}

STACK_OF(X509_ATTRIBUTE) *X509at_add1_attr_by_txt(STACK_OF(X509_ATTRIBUTE) **x,
                                                  const char *attrname,
                                                  int type,
                                                  const unsigned char *bytes,
                                                  int len) {
  X509_ATTRIBUTE *attr;
  STACK_OF(X509_ATTRIBUTE) *ret;
  attr = X509_ATTRIBUTE_create_by_txt(NULL, attrname, type, bytes, len);
  if (!attr) {
    return 0;
  }
  ret = X509at_add1_attr(x, attr);
  X509_ATTRIBUTE_free(attr);
  return ret;
}

X509_ATTRIBUTE *X509_ATTRIBUTE_create_by_NID(X509_ATTRIBUTE **attr, int nid,
                                             int attrtype, const void *data,
                                             int len) {
  const ASN1_OBJECT *obj;

  obj = OBJ_nid2obj(nid);
  if (obj == NULL) {
    OPENSSL_PUT_ERROR(X509, X509_R_UNKNOWN_NID);
    return NULL;
  }
  return X509_ATTRIBUTE_create_by_OBJ(attr, obj, attrtype, data, len);
}

X509_ATTRIBUTE *X509_ATTRIBUTE_create_by_OBJ(X509_ATTRIBUTE **attr,
                                             const ASN1_OBJECT *obj,
                                             int attrtype, const void *data,
                                             int len) {
  X509_ATTRIBUTE *ret;

  if ((attr == NULL) || (*attr == NULL)) {
    if ((ret = X509_ATTRIBUTE_new()) == NULL) {
      return NULL;
    }
  } else {
    ret = *attr;
  }

  if (!X509_ATTRIBUTE_set1_object(ret, obj)) {
    goto err;
  }
  if (!X509_ATTRIBUTE_set1_data(ret, attrtype, data, len)) {
    goto err;
  }

  if ((attr != NULL) && (*attr == NULL)) {
    *attr = ret;
  }
  return ret;
err:
  if ((attr == NULL) || (ret != *attr)) {
    X509_ATTRIBUTE_free(ret);
  }
  return NULL;
}

X509_ATTRIBUTE *X509_ATTRIBUTE_create_by_txt(X509_ATTRIBUTE **attr,
                                             const char *attrname, int type,
                                             const unsigned char *bytes,
                                             int len) {
  ASN1_OBJECT *obj;
  X509_ATTRIBUTE *nattr;

  obj = OBJ_txt2obj(attrname, 0);
  if (obj == NULL) {
    OPENSSL_PUT_ERROR(X509, X509_R_INVALID_FIELD_NAME);
    ERR_add_error_data(2, "name=", attrname);
    return NULL;
  }
  nattr = X509_ATTRIBUTE_create_by_OBJ(attr, obj, type, bytes, len);
  ASN1_OBJECT_free(obj);
  return nattr;
}

int X509_ATTRIBUTE_set1_object(X509_ATTRIBUTE *attr, const ASN1_OBJECT *obj) {
  if ((attr == NULL) || (obj == NULL)) {
    return 0;
  }
  ASN1_OBJECT_free(attr->object);
  attr->object = OBJ_dup(obj);
  return attr->object != NULL;
}

int X509_ATTRIBUTE_set1_data(X509_ATTRIBUTE *attr, int attrtype,
                             const void *data, int len) {
  ASN1_TYPE *ttmp = NULL;
  ASN1_STRING *stmp = NULL;
  int atype = 0;
  if (!attr) {
    return 0;
  }
  if (attrtype & MBSTRING_FLAG) {
    stmp = ASN1_STRING_set_by_NID(NULL, data, len, attrtype,
                                  OBJ_obj2nid(attr->object));
    if (!stmp) {
      OPENSSL_PUT_ERROR(X509, ERR_R_ASN1_LIB);
      return 0;
    }
    atype = stmp->type;
  } else if (len != -1) {
    if (!(stmp = ASN1_STRING_type_new(attrtype))) {
      goto err;
    }
    if (!ASN1_STRING_set(stmp, data, len)) {
      goto err;
    }
    atype = attrtype;
  }
  // This is a bit naughty because the attribute should really have at
  // least one value but some types use and zero length SET and require
  // this.
  if (attrtype == 0) {
    ASN1_STRING_free(stmp);
    return 1;
  }
  if (!(ttmp = ASN1_TYPE_new())) {
    goto err;
  }
  if ((len == -1) && !(attrtype & MBSTRING_FLAG)) {
    if (!ASN1_TYPE_set1(ttmp, attrtype, data)) {
      goto err;
    }
  } else {
    ASN1_TYPE_set(ttmp, atype, stmp);
    stmp = NULL;
  }
  if (!sk_ASN1_TYPE_push(attr->set, ttmp)) {
    goto err;
  }
  return 1;
err:
  ASN1_TYPE_free(ttmp);
  ASN1_STRING_free(stmp);
  return 0;
}

int X509_ATTRIBUTE_count(const X509_ATTRIBUTE *attr) {
  return sk_ASN1_TYPE_num(attr->set);
}

ASN1_OBJECT *X509_ATTRIBUTE_get0_object(X509_ATTRIBUTE *attr) {
  if (attr == NULL) {
    return NULL;
  }
  return attr->object;
}

void *X509_ATTRIBUTE_get0_data(X509_ATTRIBUTE *attr, int idx, int attrtype,
                               void *unused) {
  ASN1_TYPE *ttmp;
  ttmp = X509_ATTRIBUTE_get0_type(attr, idx);
  if (!ttmp) {
    return NULL;
  }
  if (attrtype != ASN1_TYPE_get(ttmp)) {
    OPENSSL_PUT_ERROR(X509, X509_R_WRONG_TYPE);
    return NULL;
  }
  return (void *)asn1_type_value_as_pointer(ttmp);
}

ASN1_TYPE *X509_ATTRIBUTE_get0_type(X509_ATTRIBUTE *attr, int idx) {
  if (attr == NULL) {
    return NULL;
  }
  if (idx >= X509_ATTRIBUTE_count(attr)) {
    return NULL;
  }
  return sk_ASN1_TYPE_value(attr->set, idx);
}