text: /* crypto/pem/pem_info.c */
  /* 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 <CNIOBoringSSL_pem.h>
  
  #include <assert.h>
  #include <stdio.h>
  #include <string.h>
  
  #include <CNIOBoringSSL_dsa.h>
  #include <CNIOBoringSSL_err.h>
  #include <CNIOBoringSSL_evp.h>
  #include <CNIOBoringSSL_mem.h>
  #include <CNIOBoringSSL_obj.h>
  #include <CNIOBoringSSL_rsa.h>
  #include <CNIOBoringSSL_x509.h>
  
  #ifndef OPENSSL_NO_FP_API
  STACK_OF(X509_INFO) *PEM_X509_INFO_read(FILE *fp, STACK_OF(X509_INFO) *sk,
                                          pem_password_cb *cb, void *u)
  {
      BIO *b = BIO_new_fp(fp, BIO_NOCLOSE);
      if (b == NULL) {
          OPENSSL_PUT_ERROR(PEM, ERR_R_BUF_LIB);
          return 0;
      }
      STACK_OF(X509_INFO) *ret = PEM_X509_INFO_read_bio(b, sk, cb, u);
      BIO_free(b);
      return ret;
  }
  #endif
  
  enum parse_result_t {
      parse_ok,
      parse_error,
      parse_new_entry,
  };
  
  static enum parse_result_t parse_x509(X509_INFO *info, const uint8_t *data,
                                        size_t len, int key_type)
  {
      if (info->x509 != NULL) {
          return parse_new_entry;
      }
      info->x509 = d2i_X509(NULL, &data, len);
      return info->x509 != NULL ? parse_ok : parse_error;
  }
  
  static enum parse_result_t parse_x509_aux(X509_INFO *info, const uint8_t *data,
                                            size_t len, int key_type)
  {
      if (info->x509 != NULL) {
          return parse_new_entry;
      }
      info->x509 = d2i_X509_AUX(NULL, &data, len);
      return info->x509 != NULL ? parse_ok : parse_error;
  }
  
  static enum parse_result_t parse_crl(X509_INFO *info, const uint8_t *data,
                                       size_t len, int key_type)
  {
      if (info->crl != NULL) {
          return parse_new_entry;
      }
      info->crl = d2i_X509_CRL(NULL, &data, len);
      return info->crl != NULL ? parse_ok : parse_error;
  }
  
  static enum parse_result_t parse_key(X509_INFO *info, const uint8_t *data,
                                       size_t len, int key_type)
  {
      if (info->x_pkey != NULL) {
          return parse_new_entry;
      }
      info->x_pkey = X509_PKEY_new();
      if (info->x_pkey == NULL) {
          return parse_error;
      }
      info->x_pkey->dec_pkey = d2i_PrivateKey(key_type, NULL, &data, len);
      return info->x_pkey->dec_pkey != NULL ? parse_ok : parse_error;
  }
  
  STACK_OF(X509_INFO) *PEM_X509_INFO_read_bio(BIO *bp, STACK_OF(X509_INFO) *sk,
                                              pem_password_cb *cb, void *u)
  {
      X509_INFO *info = NULL;
      char *name = NULL, *header = NULL;
      unsigned char *data = NULL;
      long len;
      int ok = 0;
      STACK_OF(X509_INFO) *ret = NULL;
  
      if (sk == NULL) {
          ret = sk_X509_INFO_new_null();
          if (ret == NULL) {
              OPENSSL_PUT_ERROR(PEM, ERR_R_MALLOC_FAILURE);
              return NULL;
          }
      } else {
          ret = sk;
      }
      size_t orig_num = sk_X509_INFO_num(ret);
  
      info = X509_INFO_new();
      if (info == NULL) {
          goto err;
      }
  
      for (;;) {
          if (!PEM_read_bio(bp, &name, &header, &data, &len)) {
              uint32_t error = ERR_peek_last_error();
              if (ERR_GET_LIB(error) == ERR_LIB_PEM &&
                  ERR_GET_REASON(error) == PEM_R_NO_START_LINE) {
                  ERR_clear_error();
                  break;
              }
              goto err;
          }
  
          enum parse_result_t (*parse_function)(X509_INFO *, const uint8_t *,
                                                size_t, int) = NULL;
          int key_type = EVP_PKEY_NONE;
          if (strcmp(name, PEM_STRING_X509) == 0 ||
              strcmp(name, PEM_STRING_X509_OLD) == 0) {
              parse_function = parse_x509;
          } else if (strcmp(name, PEM_STRING_X509_TRUSTED) == 0) {
              parse_function = parse_x509_aux;
          } else if (strcmp(name, PEM_STRING_X509_CRL) == 0) {
              parse_function = parse_crl;
          } else if (strcmp(name, PEM_STRING_RSA) == 0) {
              parse_function = parse_key;
              key_type = EVP_PKEY_RSA;
          } else if (strcmp(name, PEM_STRING_DSA) == 0) {
              parse_function = parse_key;
              key_type = EVP_PKEY_DSA;
          } else if (strcmp(name, PEM_STRING_ECPRIVATEKEY) == 0) {
              parse_function = parse_key;
              key_type = EVP_PKEY_EC;
          }
  
          /* If a private key has a header, assume it is encrypted. */
          if (key_type != EVP_PKEY_NONE && strlen(header) > 10) {
              if (info->x_pkey != NULL) {
                  if (!sk_X509_INFO_push(ret, info)) {
                      goto err;
                  }
                  info = X509_INFO_new();
                  if (info == NULL) {
                      goto err;
                  }
              }
              /* Historically, raw entries pushed an empty key. */
              info->x_pkey = X509_PKEY_new();
              if (info->x_pkey == NULL ||
                  !PEM_get_EVP_CIPHER_INFO(header, &info->enc_cipher)) {
                  goto err;
              }
              info->enc_data = (char *)data;
              info->enc_len = (int)len;
              data = NULL;
          } else if (parse_function != NULL) {
              EVP_CIPHER_INFO cipher;
              if (!PEM_get_EVP_CIPHER_INFO(header, &cipher) ||
                  !PEM_do_header(&cipher, data, &len, cb, u)) {
                  goto err;
              }
              enum parse_result_t result =
                  parse_function(info, data, len, key_type);
              if (result == parse_new_entry) {
                  if (!sk_X509_INFO_push(ret, info)) {
                      goto err;
                  }
                  info = X509_INFO_new();
                  if (info == NULL) {
                      goto err;
                  }
                  result = parse_function(info, data, len, key_type);
              }
              if (result != parse_ok) {
                  OPENSSL_PUT_ERROR(PEM, ERR_R_ASN1_LIB);
                  goto err;
              }
          }
          OPENSSL_free(name);
          OPENSSL_free(header);
          OPENSSL_free(data);
          name = NULL;
          header = NULL;
          data = NULL;
      }
  
      /* Push the last entry on the stack if not empty. */
      if (info->x509 != NULL || info->crl != NULL ||
          info->x_pkey != NULL || info->enc_data != NULL) {
          if (!sk_X509_INFO_push(ret, info)) {
              goto err;
          }
          info = NULL;
      }
  
      ok = 1;
  
   err:
      X509_INFO_free(info);
      if (!ok) {
          while (sk_X509_INFO_num(ret) > orig_num) {
              X509_INFO_free(sk_X509_INFO_pop(ret));
          }
          if (ret != sk) {
              sk_X509_INFO_free(ret);
          }
          ret = NULL;
      }
  
      OPENSSL_free(name);
      OPENSSL_free(header);
      OPENSSL_free(data);
      return ret;
  }
  
  /* A TJH addition */
  int PEM_X509_INFO_write_bio(BIO *bp, X509_INFO *xi, EVP_CIPHER *enc,
                              unsigned char *kstr, int klen,
                              pem_password_cb *cb, void *u)
  {
      int i, ret = 0;
      unsigned char *data = NULL;
      const char *objstr = NULL;
      char buf[PEM_BUFSIZE];
      unsigned char *iv = NULL;
      unsigned iv_len = 0;
  
      if (enc != NULL) {
          iv_len = EVP_CIPHER_iv_length(enc);
          objstr = OBJ_nid2sn(EVP_CIPHER_nid(enc));
          if (objstr == NULL) {
              OPENSSL_PUT_ERROR(PEM, PEM_R_UNSUPPORTED_CIPHER);
              goto err;
          }
      }
  
      /*
       * now for the fun part ... if we have a private key then we have to be
       * able to handle a not-yet-decrypted key being written out correctly ...
       * if it is decrypted or it is non-encrypted then we use the base code
       */
      if (xi->x_pkey != NULL) {
          if ((xi->enc_data != NULL) && (xi->enc_len > 0)) {
              if (enc == NULL) {
                  OPENSSL_PUT_ERROR(PEM, PEM_R_CIPHER_IS_NULL);
                  goto err;
              }
  
              /* copy from weirdo names into more normal things */
              iv = xi->enc_cipher.iv;
              data = (unsigned char *)xi->enc_data;
              i = xi->enc_len;
  
              /*
               * we take the encryption data from the internal stuff rather
               * than what the user has passed us ... as we have to match
               * exactly for some strange reason
               */
              objstr = OBJ_nid2sn(EVP_CIPHER_nid(xi->enc_cipher.cipher));
              if (objstr == NULL) {
                  OPENSSL_PUT_ERROR(PEM, PEM_R_UNSUPPORTED_CIPHER);
                  goto err;
              }
  
              /* create the right magic header stuff */
              assert(strlen(objstr) + 23 + 2 * iv_len + 13 <= sizeof buf);
              buf[0] = '\0';
              PEM_proc_type(buf, PEM_TYPE_ENCRYPTED);
              PEM_dek_info(buf, objstr, iv_len, (char *)iv);
  
              /* use the normal code to write things out */
              i = PEM_write_bio(bp, PEM_STRING_RSA, buf, data, i);
              if (i <= 0)
                  goto err;
          } else {
              /* Add DSA/DH */
              /* normal optionally encrypted stuff */
              if (PEM_write_bio_RSAPrivateKey(bp,
                                              xi->x_pkey->dec_pkey->pkey.rsa,
                                              enc, kstr, klen, cb, u) <= 0)
                  goto err;
          }
      }
  
      /* if we have a certificate then write it out now */
      if ((xi->x509 != NULL) && (PEM_write_bio_X509(bp, xi->x509) <= 0))
          goto err;
  
      /*
       * we are ignoring anything else that is loaded into the X509_INFO
       * structure for the moment ... as I don't need it so I'm not coding it
       * here and Eric can do it when this makes it into the base library --tjh
       */
  
      ret = 1;
  
  err:
    OPENSSL_cleanse(buf, PEM_BUFSIZE);
    return ret;
  }
  