text: /*
   * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
   *
   * Licensed under the OpenSSL license (the "License").  You may not use
   * this file except in compliance with the License.  You can obtain a copy
   * in the file LICENSE in the source distribution or at
   * https://www.openssl.org/source/license.html
   */
  
  #include <stdio.h>
  #include "internal/ctype.h"
  #include <string.h>
  #include "internal/cryptlib.h"
  #include <openssl/buffer.h>
  #include <openssl/objects.h>
  #include <openssl/evp.h>
  #include <openssl/rand.h>
  #include <openssl/x509.h>
  #include <openssl/pem.h>
  #include <openssl/pkcs12.h>
  #include "internal/asn1_int.h"
  #include <openssl/des.h>
  #include <openssl/engine.h>
  
  #define MIN_LENGTH      4
  
  static int load_iv(char **fromp, unsigned char *to, int num);
  static int check_pem(const char *nm, const char *name);
  int pem_check_suffix(const char *pem_str, const char *suffix);
  
  int PEM_def_callback(char *buf, int num, int rwflag, void *userdata)
  {
      int i, min_len;
      const char *prompt;
  
      /* We assume that the user passes a default password as userdata */
      if (userdata) {
          i = strlen(userdata);
          i = (i > num) ? num : i;
          memcpy(buf, userdata, i);
          return i;
      }
  
      prompt = EVP_get_pw_prompt();
      if (prompt == NULL)
          prompt = "Enter PEM pass phrase:";
  
      /*
       * rwflag == 0 means decryption
       * rwflag == 1 means encryption
       *
       * We assume that for encryption, we want a minimum length, while for
       * decryption, we cannot know any minimum length, so we assume zero.
       */
      min_len = rwflag ? MIN_LENGTH : 0;
  
      i = EVP_read_pw_string_min(buf, min_len, num, prompt, rwflag);
      if (i != 0) {
          PEMerr(PEM_F_PEM_DEF_CALLBACK, PEM_R_PROBLEMS_GETTING_PASSWORD);
          memset(buf, 0, (unsigned int)num);
          return -1;
      }
      return strlen(buf);
  }
  
  void PEM_proc_type(char *buf, int type)
  {
      const char *str;
      char *p = buf + strlen(buf);
  
      if (type == PEM_TYPE_ENCRYPTED)
          str = "ENCRYPTED";
      else if (type == PEM_TYPE_MIC_CLEAR)
          str = "MIC-CLEAR";
      else if (type == PEM_TYPE_MIC_ONLY)
          str = "MIC-ONLY";
      else
          str = "BAD-TYPE";
  
      BIO_snprintf(p, PEM_BUFSIZE - (size_t)(p - buf), "Proc-Type: 4,%s\n", str);
  }
  
  void PEM_dek_info(char *buf, const char *type, int len, char *str)
  {
      long i;
      char *p = buf + strlen(buf);
      int j = PEM_BUFSIZE - (size_t)(p - buf), n;
  
      n = BIO_snprintf(p, j, "DEK-Info: %s,", type);
      if (n > 0) {
          j -= n;
          p += n;
          for (i = 0; i < len; i++) {
              n = BIO_snprintf(p, j, "%02X", 0xff & str[i]);
              if (n <= 0)
                  return;
              j -= n;
              p += n;
          }
          if (j > 1)
              strcpy(p, "\n");
      }
  }
  
  #ifndef OPENSSL_NO_STDIO
  void *PEM_ASN1_read(d2i_of_void *d2i, const char *name, FILE *fp, void **x,
                      pem_password_cb *cb, void *u)
  {
      BIO *b;
      void *ret;
  
      if ((b = BIO_new(BIO_s_file())) == NULL) {
          PEMerr(PEM_F_PEM_ASN1_READ, ERR_R_BUF_LIB);
          return 0;
      }
      BIO_set_fp(b, fp, BIO_NOCLOSE);
      ret = PEM_ASN1_read_bio(d2i, name, b, x, cb, u);
      BIO_free(b);
      return ret;
  }
  #endif
  
  static int check_pem(const char *nm, const char *name)
  {
      /* Normal matching nm and name */
      if (strcmp(nm, name) == 0)
          return 1;
  
      /* Make PEM_STRING_EVP_PKEY match any private key */
  
      if (strcmp(name, PEM_STRING_EVP_PKEY) == 0) {
          int slen;
          const EVP_PKEY_ASN1_METHOD *ameth;
          if (strcmp(nm, PEM_STRING_PKCS8) == 0)
              return 1;
          if (strcmp(nm, PEM_STRING_PKCS8INF) == 0)
              return 1;
  #ifndef OPENSSL_NO_CNSM					//add by gujq on 20190830 for tasshsm engine v 0.6
          if(strcmp(nm, PEM_STRING_TASSHSM_ECPRIVATEKEY) ==0)
              return 1;
  	if(strcmp(nm, PEM_STRING_TASSCARD_ECPRIVATEKEY) ==0)
              return 1;
  #endif
          slen = pem_check_suffix(nm, "PRIVATE KEY");
          if (slen > 0) {
              /*
               * NB: ENGINE implementations won't contain a deprecated old
               * private key decode function so don't look for them.
               */
              ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen);
              if (ameth && ameth->old_priv_decode)
                  return 1;
          }
          return 0;
      }
  
      if (strcmp(name, PEM_STRING_PARAMETERS) == 0) {
          int slen;
          const EVP_PKEY_ASN1_METHOD *ameth;
          slen = pem_check_suffix(nm, "PARAMETERS");
          if (slen > 0) {
              ENGINE *e;
              ameth = EVP_PKEY_asn1_find_str(&e, nm, slen);
              if (ameth) {
                  int r;
                  if (ameth->param_decode)
                      r = 1;
                  else
                      r = 0;
  #ifndef OPENSSL_NO_ENGINE
                  ENGINE_finish(e);
  #endif
                  return r;
              }
          }
          return 0;
      }
      /* If reading DH parameters handle X9.42 DH format too */
      if (strcmp(nm, PEM_STRING_DHXPARAMS) == 0
          && strcmp(name, PEM_STRING_DHPARAMS) == 0)
          return 1;
  
      /* Permit older strings */
  
      if (strcmp(nm, PEM_STRING_X509_OLD) == 0
          && strcmp(name, PEM_STRING_X509) == 0)
          return 1;
  
      if (strcmp(nm, PEM_STRING_X509_REQ_OLD) == 0
          && strcmp(name, PEM_STRING_X509_REQ) == 0)
          return 1;
  
      /* Allow normal certs to be read as trusted certs */
      if (strcmp(nm, PEM_STRING_X509) == 0
          && strcmp(name, PEM_STRING_X509_TRUSTED) == 0)
          return 1;
  
      if (strcmp(nm, PEM_STRING_X509_OLD) == 0
          && strcmp(name, PEM_STRING_X509_TRUSTED) == 0)
          return 1;
  
      /* Some CAs use PKCS#7 with CERTIFICATE headers */
      if (strcmp(nm, PEM_STRING_X509) == 0
          && strcmp(name, PEM_STRING_PKCS7) == 0)
          return 1;
  
      if (strcmp(nm, PEM_STRING_PKCS7_SIGNED) == 0
          && strcmp(name, PEM_STRING_PKCS7) == 0)
          return 1;
  
  #ifndef OPENSSL_NO_CMS
      if (strcmp(nm, PEM_STRING_X509) == 0
          && strcmp(name, PEM_STRING_CMS) == 0)
          return 1;
      /* Allow CMS to be read from PKCS#7 headers */
      if (strcmp(nm, PEM_STRING_PKCS7) == 0
          && strcmp(name, PEM_STRING_CMS) == 0)
          return 1;
  #endif
  
      return 0;
  }
  
  static void pem_free(void *p, unsigned int flags, size_t num)
  {
      if (flags & PEM_FLAG_SECURE)
          OPENSSL_secure_clear_free(p, num);
      else
          OPENSSL_free(p);
  }
  
  static void *pem_malloc(int num, unsigned int flags)
  {
      return (flags & PEM_FLAG_SECURE) ? OPENSSL_secure_malloc(num)
                                       : OPENSSL_malloc(num);
  }
  
  static int pem_bytes_read_bio_flags(unsigned char **pdata, long *plen,
                                      char **pnm, const char *name, BIO *bp,
                                      pem_password_cb *cb, void *u,
                                      unsigned int flags)
  {
      EVP_CIPHER_INFO cipher;
      char *nm = NULL, *header = NULL;
      unsigned char *data = NULL;
      long len = 0;
      int ret = 0;
  
      do {
          pem_free(nm, flags, 0);
          pem_free(header, flags, 0);
          pem_free(data, flags, len);
          if (!PEM_read_bio_ex(bp, &nm, &header, &data, &len, flags)) {
              if (ERR_GET_REASON(ERR_peek_error()) == PEM_R_NO_START_LINE)
                  ERR_add_error_data(2, "Expecting: ", name);
              return 0;
          }
      } while (!check_pem(nm, name));
      if (!PEM_get_EVP_CIPHER_INFO(header, &cipher))
          goto err;
      if (!PEM_do_header(&cipher, data, &len, cb, u))
          goto err;
  
      *pdata = data;
      *plen = len;
  
      if (pnm != NULL)
          *pnm = nm;
  
      ret = 1;
  
   err:
      if (!ret || pnm == NULL)
          pem_free(nm, flags, 0);
      pem_free(header, flags, 0);
      if (!ret)
          pem_free(data, flags, len);
      return ret;
  }
  
  int PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm,
                         const char *name, BIO *bp, pem_password_cb *cb,
                         void *u) {
      return pem_bytes_read_bio_flags(pdata, plen, pnm, name, bp, cb, u,
                                      PEM_FLAG_EAY_COMPATIBLE);
  }
  
  int PEM_bytes_read_bio_secmem(unsigned char **pdata, long *plen, char **pnm,
                                const char *name, BIO *bp, pem_password_cb *cb,
                                void *u) {
      return pem_bytes_read_bio_flags(pdata, plen, pnm, name, bp, cb, u,
                                      PEM_FLAG_SECURE | PEM_FLAG_EAY_COMPATIBLE);
  }
  
  #ifndef OPENSSL_NO_STDIO
  int PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp,
                     void *x, const EVP_CIPHER *enc, unsigned char *kstr,
                     int klen, pem_password_cb *callback, void *u)
  {
      BIO *b;
      int ret;
  
      if ((b = BIO_new(BIO_s_file())) == NULL) {
          PEMerr(PEM_F_PEM_ASN1_WRITE, ERR_R_BUF_LIB);
          return 0;
      }
      BIO_set_fp(b, fp, BIO_NOCLOSE);
      ret = PEM_ASN1_write_bio(i2d, name, b, x, enc, kstr, klen, callback, u);
      BIO_free(b);
      return ret;
  }
  #endif
  
  int PEM_ASN1_write_bio(i2d_of_void *i2d, const char *name, BIO *bp,
                         void *x, const EVP_CIPHER *enc, unsigned char *kstr,
                         int klen, pem_password_cb *callback, void *u)
  {
      EVP_CIPHER_CTX *ctx = NULL;
      int dsize = 0, i = 0, j = 0, ret = 0;
      unsigned char *p, *data = NULL;
      const char *objstr = NULL;
      char buf[PEM_BUFSIZE];
      unsigned char key[EVP_MAX_KEY_LENGTH];
      unsigned char iv[EVP_MAX_IV_LENGTH];
  
      if (enc != NULL) {
          objstr = OBJ_nid2sn(EVP_CIPHER_nid(enc));
          if (objstr == NULL || EVP_CIPHER_iv_length(enc) == 0
                  || EVP_CIPHER_iv_length(enc) > (int)sizeof(iv)
                     /*
                      * Check "Proc-Type: 4,Encrypted\nDEK-Info: objstr,hex-iv\n"
                      * fits into buf
                      */
                  || (strlen(objstr) + 23 + 2 * EVP_CIPHER_iv_length(enc) + 13)
                     > sizeof(buf)) {
              PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_UNSUPPORTED_CIPHER);
              goto err;
          }
      }
  
      if ((dsize = i2d(x, NULL)) < 0) {
          PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_ASN1_LIB);
          dsize = 0;
          goto err;
      }
      /* dsize + 8 bytes are needed */
      /* actually it needs the cipher block size extra... */
      data = OPENSSL_malloc((unsigned int)dsize + 20);
      if (data == NULL) {
          PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, ERR_R_MALLOC_FAILURE);
          goto err;
      }
      p = data;
      i = i2d(x, &p);
  
      if (enc != NULL) {
          if (kstr == NULL) {
              if (callback == NULL)
                  klen = PEM_def_callback(buf, PEM_BUFSIZE, 1, u);
              else
                  klen = (*callback) (buf, PEM_BUFSIZE, 1, u);
              if (klen <= 0) {
                  PEMerr(PEM_F_PEM_ASN1_WRITE_BIO, PEM_R_READ_KEY);
                  goto err;
              }
  #ifdef CHARSET_EBCDIC
              /* Convert the pass phrase from EBCDIC */
              ebcdic2ascii(buf, buf, klen);
  #endif
              kstr = (unsigned char *)buf;
          }
          if (RAND_bytes(iv, EVP_CIPHER_iv_length(enc)) <= 0) /* Generate a salt */
              goto err;
          /*
           * The 'iv' is used as the iv and as a salt.  It is NOT taken from
           * the BytesToKey function
           */
          if (!EVP_BytesToKey(enc, EVP_md5(), iv, kstr, klen, 1, key, NULL))
              goto err;
  
          if (kstr == (unsigned char *)buf)
              OPENSSL_cleanse(buf, PEM_BUFSIZE);
  
          buf[0] = '\0';
          PEM_proc_type(buf, PEM_TYPE_ENCRYPTED);
          PEM_dek_info(buf, objstr, EVP_CIPHER_iv_length(enc), (char *)iv);
          /* k=strlen(buf); */
  
          ret = 1;
          if ((ctx = EVP_CIPHER_CTX_new()) == NULL
              || !EVP_EncryptInit_ex(ctx, enc, NULL, key, iv)
              || !EVP_EncryptUpdate(ctx, data, &j, data, i)
              || !EVP_EncryptFinal_ex(ctx, &(data[j]), &i))
              ret = 0;
          if (ret == 0)
              goto err;
          i += j;
      } else {
          ret = 1;
          buf[0] = '\0';
      }
  #ifndef OPENSSL_NO_CNSM					//add by gujq on 20190830 for tasshsm engine v0.6
  		if(strcmp(name, "EC PRIVATE KEY") == 0){
  			if(EC_KEY_get_flags((EC_KEY*)x) & EC_FLAG_TASSHSM_ENGINE){
      		name = "TASSHSM EC PRIVATE KEY";
      	}
      	if(EC_KEY_get_flags((EC_KEY*)x) & EC_FLAG_TASSCARD_ENGINE){
      		name = "TASSCARD EC PRIVATE KEY";
      	}
      }
  #endif
  
      i = PEM_write_bio(bp, name, buf, data, i);
      if (i <= 0)
          ret = 0;
   err:
      OPENSSL_cleanse(key, sizeof(key));
      OPENSSL_cleanse(iv, sizeof(iv));
      EVP_CIPHER_CTX_free(ctx);
      OPENSSL_cleanse(buf, PEM_BUFSIZE);
      OPENSSL_clear_free(data, (unsigned int)dsize);
      return ret;
  }
  
  int PEM_do_header(EVP_CIPHER_INFO *cipher, unsigned char *data, long *plen,
                    pem_password_cb *callback, void *u)
  {
      int ok;
      int keylen;
      long len = *plen;
      int ilen = (int) len;       /* EVP_DecryptUpdate etc. take int lengths */
      EVP_CIPHER_CTX *ctx;
      unsigned char key[EVP_MAX_KEY_LENGTH];
      char buf[PEM_BUFSIZE];
  
  #if LONG_MAX > INT_MAX
      /* Check that we did not truncate the length */
      if (len > INT_MAX) {
          PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_HEADER_TOO_LONG);
          return 0;
      }
  #endif
  
      if (cipher->cipher == NULL)
          return 1;
      if (callback == NULL)
          keylen = PEM_def_callback(buf, PEM_BUFSIZE, 0, u);
      else
          keylen = callback(buf, PEM_BUFSIZE, 0, u);
      if (keylen < 0) {
          PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_PASSWORD_READ);
          return 0;
      }
  #ifdef CHARSET_EBCDIC
      /* Convert the pass phrase from EBCDIC */
      ebcdic2ascii(buf, buf, keylen);
  #endif
  
      if (!EVP_BytesToKey(cipher->cipher, EVP_md5(), &(cipher->iv[0]),
                          (unsigned char *)buf, keylen, 1, key, NULL))
          return 0;
  
      ctx = EVP_CIPHER_CTX_new();
      if (ctx == NULL)
          return 0;
  
      ok = EVP_DecryptInit_ex(ctx, cipher->cipher, NULL, key, &(cipher->iv[0]));
      if (ok)
          ok = EVP_DecryptUpdate(ctx, data, &ilen, data, ilen);
      if (ok) {
          /* Squirrel away the length of data decrypted so far. */
          *plen = ilen;
          ok = EVP_DecryptFinal_ex(ctx, &(data[ilen]), &ilen);
      }
      if (ok)
          *plen += ilen;
      else
          PEMerr(PEM_F_PEM_DO_HEADER, PEM_R_BAD_DECRYPT);
  
      EVP_CIPHER_CTX_free(ctx);
      OPENSSL_cleanse((char *)buf, sizeof(buf));
      OPENSSL_cleanse((char *)key, sizeof(key));
      return ok;
  }
  
  /*
   * This implements a very limited PEM header parser that does not support the
   * full grammar of rfc1421.  In particular, folded headers are not supported,
   * nor is additional whitespace.
   *
   * A robust implementation would make use of a library that turns the headers
   * into a BIO from which one folded line is read at a time, and is then split
   * into a header label and content.  We would then parse the content of the
   * headers we care about.  This is overkill for just this limited use-case, but
   * presumably we also parse rfc822-style headers for S/MIME, so a common
   * abstraction might well be more generally useful.
   */
  int PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher)
  {
      static const char ProcType[] = "Proc-Type:";
      static const char ENCRYPTED[] = "ENCRYPTED";
      static const char DEKInfo[] = "DEK-Info:";
      const EVP_CIPHER *enc = NULL;
      int ivlen;
      char *dekinfostart, c;
  
      cipher->cipher = NULL;
      memset(cipher->iv, 0, sizeof(cipher->iv));
      if ((header == NULL) || (*header == '\0') || (*header == '\n'))
          return 1;
  
      if (strncmp(header, ProcType, sizeof(ProcType)-1) != 0) {
          PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_PROC_TYPE);
          return 0;
      }
      header += sizeof(ProcType)-1;
      header += strspn(header, " \t");
  
      if (*header++ != '4' || *header++ != ',')
          return 0;
      header += strspn(header, " \t");
  
      /* We expect "ENCRYPTED" followed by optional white-space + line break */
      if (strncmp(header, ENCRYPTED, sizeof(ENCRYPTED)-1) != 0 ||
          strspn(header+sizeof(ENCRYPTED)-1, " \t\r\n") == 0) {
          PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_ENCRYPTED);
          return 0;
      }
      header += sizeof(ENCRYPTED)-1;
      header += strspn(header, " \t\r");
      if (*header++ != '\n') {
          PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_SHORT_HEADER);
          return 0;
      }
  
      /*-
       * https://tools.ietf.org/html/rfc1421#section-4.6.1.3
       * We expect "DEK-Info: algo[,hex-parameters]"
       */
      if (strncmp(header, DEKInfo, sizeof(DEKInfo)-1) != 0) {
          PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_NOT_DEK_INFO);
          return 0;
      }
      header += sizeof(DEKInfo)-1;
      header += strspn(header, " \t");
  
      /*
       * DEK-INFO is a comma-separated combination of algorithm name and optional
       * parameters.
       */
      dekinfostart = header;
      header += strcspn(header, " \t,");
      c = *header;
      *header = '\0';
      cipher->cipher = enc = EVP_get_cipherbyname(dekinfostart);
      *header = c;
      header += strspn(header, " \t");
  
      if (enc == NULL) {
          PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_UNSUPPORTED_ENCRYPTION);
          return 0;
      }
      ivlen = EVP_CIPHER_iv_length(enc);
      if (ivlen > 0 && *header++ != ',') {
          PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_MISSING_DEK_IV);
          return 0;
      } else if (ivlen == 0 && *header == ',') {
          PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO, PEM_R_UNEXPECTED_DEK_IV);
          return 0;
      }
  
      if (!load_iv(&header, cipher->iv, EVP_CIPHER_iv_length(enc)))
          return 0;
  
      return 1;
  }
  
  static int load_iv(char **fromp, unsigned char *to, int num)
  {
      int v, i;
      char *from;
  
      from = *fromp;
      for (i = 0; i < num; i++)
          to[i] = 0;
      num *= 2;
      for (i = 0; i < num; i++) {
          v = OPENSSL_hexchar2int(*from);
          if (v < 0) {
              PEMerr(PEM_F_LOAD_IV, PEM_R_BAD_IV_CHARS);
              return 0;
          }
          from++;
          to[i / 2] |= v << (long)((!(i & 1)) * 4);
      }
  
      *fromp = from;
      return 1;
  }
  
  #ifndef OPENSSL_NO_STDIO
  int PEM_write(FILE *fp, const char *name, const char *header,
                const unsigned char *data, long len)
  {
      BIO *b;
      int ret;
  
      if ((b = BIO_new(BIO_s_file())) == NULL) {
          PEMerr(PEM_F_PEM_WRITE, ERR_R_BUF_LIB);
          return 0;
      }
      BIO_set_fp(b, fp, BIO_NOCLOSE);
      ret = PEM_write_bio(b, name, header, data, len);
      BIO_free(b);
      return ret;
  }
  #endif
  
  int PEM_write_bio(BIO *bp, const char *name, const char *header,
                    const unsigned char *data, long len)
  {
      int nlen, n, i, j, outl;
      unsigned char *buf = NULL;
      EVP_ENCODE_CTX *ctx = EVP_ENCODE_CTX_new();
      int reason = ERR_R_BUF_LIB;
      int retval = 0;
  
      if (ctx == NULL) {
          reason = ERR_R_MALLOC_FAILURE;
          goto err;
      }
  
      EVP_EncodeInit(ctx);
      nlen = strlen(name);
  
      if ((BIO_write(bp, "-----BEGIN ", 11) != 11) ||
          (BIO_write(bp, name, nlen) != nlen) ||
          (BIO_write(bp, "-----\n", 6) != 6))
          goto err;
  
      i = strlen(header);
      if (i > 0) {
          if ((BIO_write(bp, header, i) != i) || (BIO_write(bp, "\n", 1) != 1))
              goto err;
      }
  
      buf = OPENSSL_malloc(PEM_BUFSIZE * 8);
      if (buf == NULL) {
          reason = ERR_R_MALLOC_FAILURE;
          goto err;
      }
  
      i = j = 0;
      while (len > 0) {
          n = (int)((len > (PEM_BUFSIZE * 5)) ? (PEM_BUFSIZE * 5) : len);
          if (!EVP_EncodeUpdate(ctx, buf, &outl, &(data[j]), n))
              goto err;
          if ((outl) && (BIO_write(bp, (char *)buf, outl) != outl))
              goto err;
          i += outl;
          len -= n;
          j += n;
      }
      EVP_EncodeFinal(ctx, buf, &outl);
      if ((outl > 0) && (BIO_write(bp, (char *)buf, outl) != outl))
          goto err;
      if ((BIO_write(bp, "-----END ", 9) != 9) ||
          (BIO_write(bp, name, nlen) != nlen) ||
          (BIO_write(bp, "-----\n", 6) != 6))
          goto err;
      retval = i + outl;
  
   err:
      if (retval == 0)
          PEMerr(PEM_F_PEM_WRITE_BIO, reason);
      EVP_ENCODE_CTX_free(ctx);
      OPENSSL_clear_free(buf, PEM_BUFSIZE * 8);
      return retval;
  }
  
  #ifndef OPENSSL_NO_STDIO
  int PEM_read(FILE *fp, char **name, char **header, unsigned char **data,
               long *len)
  {
      BIO *b;
      int ret;
  
      if ((b = BIO_new(BIO_s_file())) == NULL) {
          PEMerr(PEM_F_PEM_READ, ERR_R_BUF_LIB);
          return 0;
      }
      BIO_set_fp(b, fp, BIO_NOCLOSE);
      ret = PEM_read_bio(b, name, header, data, len);
      BIO_free(b);
      return ret;
  }
  #endif
  
  /* Some helpers for PEM_read_bio_ex(). */
  static int sanitize_line(char *linebuf, int len, unsigned int flags)
  {
      int i;
  
      if (flags & PEM_FLAG_EAY_COMPATIBLE) {
          /* Strip trailing whitespace */
          while ((len >= 0) && (linebuf[len] <= ' '))
              len--;
          /* Go back to whitespace before applying uniform line ending. */
          len++;
      } else if (flags & PEM_FLAG_ONLY_B64) {
          for (i = 0; i < len; ++i) {
              if (!ossl_isbase64(linebuf[i]) || linebuf[i] == '\n'
                  || linebuf[i] == '\r')
                  break;
          }
          len = i;
      } else {
          /* EVP_DecodeBlock strips leading and trailing whitespace, so just strip
           * control characters in-place and let everything through. */
          for (i = 0; i < len; ++i) {
              if (linebuf[i] == '\n' || linebuf[i] == '\r')
                  break;
              if (ossl_iscntrl(linebuf[i]))
                  linebuf[i] = ' ';
          }
          len = i;
      }
      /* The caller allocated LINESIZE+1, so this is safe. */
      linebuf[len++] = '\n';
      linebuf[len] = '\0';
      return len;
  }
  
  #define LINESIZE 255
  /* Note trailing spaces for begin and end. */
  static const char beginstr[] = "-----BEGIN ";
  static const char endstr[] = "-----END ";
  static const char tailstr[] = "-----\n";
  #define BEGINLEN ((int)(sizeof(beginstr) - 1))
  #define ENDLEN ((int)(sizeof(endstr) - 1))
  #define TAILLEN ((int)(sizeof(tailstr) - 1))
  static int get_name(BIO *bp, char **name, unsigned int flags)
  {
      char *linebuf;
      int ret = 0;
      int len;
  
      /*
       * Need to hold trailing NUL (accounted for by BIO_gets() and the newline
       * that will be added by sanitize_line() (the extra '1').
       */
      linebuf = pem_malloc(LINESIZE + 1, flags);
      if (linebuf == NULL) {
          PEMerr(PEM_F_GET_NAME, ERR_R_MALLOC_FAILURE);
          return 0;
      }
  
      do {
          len = BIO_gets(bp, linebuf, LINESIZE);
  
          if (len <= 0) {
              PEMerr(PEM_F_GET_NAME, PEM_R_NO_START_LINE);
              goto err;
          }
  
          /* Strip trailing garbage and standardize ending. */
          len = sanitize_line(linebuf, len, flags & ~PEM_FLAG_ONLY_B64);
  
          /* Allow leading empty or non-matching lines. */
      } while (strncmp(linebuf, beginstr, BEGINLEN) != 0
               || len < TAILLEN
               || strncmp(linebuf + len - TAILLEN, tailstr, TAILLEN) != 0);
      linebuf[len - TAILLEN] = '\0';
      len = len - BEGINLEN - TAILLEN + 1;
      *name = pem_malloc(len, flags);
      if (*name == NULL) {
          PEMerr(PEM_F_GET_NAME, ERR_R_MALLOC_FAILURE);
          goto err;
      }
      memcpy(*name, linebuf + BEGINLEN, len);
      ret = 1;
  
  err:
      pem_free(linebuf, flags, LINESIZE + 1);
      return ret;
  }
  
  /* Keep track of how much of a header we've seen. */
  enum header_status {
      MAYBE_HEADER,
      IN_HEADER,
      POST_HEADER
  };
  
  /**
   * Extract the optional PEM header, with details on the type of content and
   * any encryption used on the contents, and the bulk of the data from the bio.
   * The end of the header is marked by a blank line; if the end-of-input marker
   * is reached prior to a blank line, there is no header.
   *
   * The header and data arguments are BIO** since we may have to swap them
   * if there is no header, for efficiency.
   *
   * We need the name of the PEM-encoded type to verify the end string.
   */
  static int get_header_and_data(BIO *bp, BIO **header, BIO **data, char *name,
                                 unsigned int flags)
  {
      BIO *tmp = *header;
      char *linebuf, *p;
      int len, line, ret = 0, end = 0;
      /* 0 if not seen (yet), 1 if reading header, 2 if finished header */
      enum header_status got_header = MAYBE_HEADER;
      unsigned int flags_mask;
      size_t namelen;
  
      /* Need to hold trailing NUL (accounted for by BIO_gets() and the newline
       * that will be added by sanitize_line() (the extra '1'). */
      linebuf = pem_malloc(LINESIZE + 1, flags);
      if (linebuf == NULL) {
          PEMerr(PEM_F_GET_HEADER_AND_DATA, ERR_R_MALLOC_FAILURE);
          return 0;
      }
  
      for (line = 0; ; line++) {
          flags_mask = ~0u;
          len = BIO_gets(bp, linebuf, LINESIZE);
          if (len <= 0) {
              PEMerr(PEM_F_GET_HEADER_AND_DATA, PEM_R_SHORT_HEADER);
              goto err;
          }
  
          if (got_header == MAYBE_HEADER) {
              if (memchr(linebuf, ':', len) != NULL)
                  got_header = IN_HEADER;
          }
          if (!strncmp(linebuf, endstr, ENDLEN) || got_header == IN_HEADER)
              flags_mask &= ~PEM_FLAG_ONLY_B64;
          len = sanitize_line(linebuf, len, flags & flags_mask);
  
          /* Check for end of header. */
          if (linebuf[0] == '\n') {
              if (got_header == POST_HEADER) {
                  /* Another blank line is an error. */
                  PEMerr(PEM_F_GET_HEADER_AND_DATA, PEM_R_BAD_END_LINE);
                  goto err;
              }
              got_header = POST_HEADER;
              tmp = *data;
              continue;
          }
  
          /* Check for end of stream (which means there is no header). */
          if (strncmp(linebuf, endstr, ENDLEN) == 0) {
              p = linebuf + ENDLEN;
              namelen = strlen(name);
              if (strncmp(p, name, namelen) != 0 ||
                  strncmp(p + namelen, tailstr, TAILLEN) != 0) {
                  PEMerr(PEM_F_GET_HEADER_AND_DATA, PEM_R_BAD_END_LINE);
                  goto err;
              }
              if (got_header == MAYBE_HEADER) {
                  *header = *data;
                  *data = tmp;
              }
              break;
          } else if (end) {
              /* Malformed input; short line not at end of data. */
              PEMerr(PEM_F_GET_HEADER_AND_DATA, PEM_R_BAD_END_LINE);
              goto err;
          }
          /*
           * Else, a line of text -- could be header or data; we don't
           * know yet.  Just pass it through.
           */
          if (BIO_puts(tmp, linebuf) < 0)
              goto err;
          /*
           * Only encrypted files need the line length check applied.
           */
          if (got_header == POST_HEADER) {
              /* 65 includes the trailing newline */
              if (len > 65)
                  goto err;
              if (len < 65)
                  end = 1;
          }
      }
  
      ret = 1;
  err:
      pem_free(linebuf, flags, LINESIZE + 1);
      return ret;
  }
  
  /**
   * Read in PEM-formatted data from the given BIO.
   *
   * By nature of the PEM format, all content must be printable ASCII (except
   * for line endings).  Other characters are malformed input and will be rejected.
   */
  int PEM_read_bio_ex(BIO *bp, char **name_out, char **header,
                      unsigned char **data, long *len_out, unsigned int flags)
  {
      EVP_ENCODE_CTX *ctx = EVP_ENCODE_CTX_new();
      const BIO_METHOD *bmeth;
      BIO *headerB = NULL, *dataB = NULL;
      char *name = NULL;
      int len, taillen, headerlen, ret = 0;
      BUF_MEM * buf_mem;
  
      if (ctx == NULL) {
          PEMerr(PEM_F_PEM_READ_BIO_EX, ERR_R_MALLOC_FAILURE);
          return 0;
      }
  
      *len_out = 0;
      *name_out = *header = NULL;
      *data = NULL;
      if ((flags & PEM_FLAG_EAY_COMPATIBLE) && (flags & PEM_FLAG_ONLY_B64)) {
          /* These two are mutually incompatible; bail out. */
          PEMerr(PEM_F_PEM_READ_BIO_EX, ERR_R_PASSED_INVALID_ARGUMENT);
          goto end;
      }
      bmeth = (flags & PEM_FLAG_SECURE) ? BIO_s_secmem() : BIO_s_mem();
  
      headerB = BIO_new(bmeth);
      dataB = BIO_new(bmeth);
      if (headerB == NULL || dataB == NULL) {
          PEMerr(PEM_F_PEM_READ_BIO_EX, ERR_R_MALLOC_FAILURE);
          goto end;
      }
  
      if (!get_name(bp, &name, flags))
          goto end;
      if (!get_header_and_data(bp, &headerB, &dataB, name, flags))
          goto end;
  
      EVP_DecodeInit(ctx);
      BIO_get_mem_ptr(dataB, &buf_mem);
      len = buf_mem->length;
      if (EVP_DecodeUpdate(ctx, (unsigned char*)buf_mem->data, &len,
                           (unsigned char*)buf_mem->data, len) < 0
              || EVP_DecodeFinal(ctx, (unsigned char*)&(buf_mem->data[len]),
                                 &taillen) < 0) {
          PEMerr(PEM_F_PEM_READ_BIO_EX, PEM_R_BAD_BASE64_DECODE);
          goto end;
      }
      len += taillen;
      buf_mem->length = len;
  
      /* There was no data in the PEM file; avoid malloc(0). */
      if (len == 0)
          goto end;
      headerlen = BIO_get_mem_data(headerB, NULL);
      *header = pem_malloc(headerlen + 1, flags);
      *data = pem_malloc(len, flags);
      if (*header == NULL || *data == NULL) {
          pem_free(*header, flags, 0);
          pem_free(*data, flags, 0);
          goto end;
      }
      BIO_read(headerB, *header, headerlen);
      (*header)[headerlen] = '\0';
      BIO_read(dataB, *data, len);
      *len_out = len;
      *name_out = name;
      name = NULL;
      ret = 1;
  
  end:
      EVP_ENCODE_CTX_free(ctx);
      pem_free(name, flags, 0);
      BIO_free(headerB);
      BIO_free(dataB);
      return ret;
  }
  
  int PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data,
                   long *len)
  {
      return PEM_read_bio_ex(bp, name, header, data, len, PEM_FLAG_EAY_COMPATIBLE);
  }
  
  /*
   * Check pem string and return prefix length. If for example the pem_str ==
   * "RSA PRIVATE KEY" and suffix = "PRIVATE KEY" the return value is 3 for the
   * string "RSA".
   */
  
  int pem_check_suffix(const char *pem_str, const char *suffix)
  {
      int pem_len = strlen(pem_str);
      int suffix_len = strlen(suffix);
      const char *p;
      if (suffix_len + 1 >= pem_len)
          return 0;
      p = pem_str + pem_len - suffix_len;
      if (strcmp(p, suffix))
          return 0;
      p--;
      if (*p != ' ')
          return 0;
      return p - pem_str;
  }
  