/* $OpenBSD: pem_lib.c,v 1.51 2022/07/31 09:48:27 tb Exp $ */

/* 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 <ctype.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <openssl/opensslconf.h>

#include <openssl/buffer.h>

#include <openssl/err.h>

#include <openssl/evp.h>

#include <openssl/objects.h>

#include <openssl/pem.h>

#include <openssl/pkcs12.h>

#include <openssl/x509.h>

#ifndef OPENSSL_NO_DES

#include <openssl/des.h>

#endif

#ifndef OPENSSL_NO_ENGINE

#include <openssl/engine.h>

#endif

#include "asn1_locl.h"

#include "evp_locl.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);

/* XXX LSSL ABI XXX return value and `num' ought to be size_t */

int

PEM_def_callback(char *buf, int num, int w, void *key)

{

  size_t l;

  int i;

  const char *prompt;

  if (num < 0)

    return -1;

  if (key) {

    l = strlen(key);

    if (l > (size_t)num)

      l = (size_t)num;

    memcpy(buf, key, l);

    return (int)l;

  }

  prompt = EVP_get_pw_prompt();

  if (prompt == NULL)

    prompt = "Enter PEM pass phrase:";

  for (;;) {

    i = EVP_read_pw_string_min(buf, MIN_LENGTH, num, prompt, w);

    if (i != 0) {

      PEMerror(PEM_R_PROBLEMS_GETTING_PASSWORD);

      memset(buf, 0, num);

      return (-1);

    }

    l = strlen(buf);

    if (l < MIN_LENGTH) {

      fprintf(stderr, "phrase is too short, "

          "needs to be at least %zu chars\n",

          (size_t)MIN_LENGTH);

    } else

      break;

  }

  return (int)l;

}

void

PEM_proc_type(char *buf, int type)

{

  const char *str;

  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";

  strlcat(buf, "Proc-Type: 4,", PEM_BUFSIZE);

  strlcat(buf, str, PEM_BUFSIZE);

  strlcat(buf, "\n", PEM_BUFSIZE);

}

void

PEM_dek_info(char *buf, const char *type, int len, char *str)

{

  static const unsigned char map[17] = "0123456789ABCDEF";

  long i;

  int j;

  strlcat(buf, "DEK-Info: ", PEM_BUFSIZE);

  strlcat(buf, type, PEM_BUFSIZE);

  strlcat(buf, ",", PEM_BUFSIZE);

  j = strlen(buf);

  if (j + (len * 2) + 1 > PEM_BUFSIZE)

    return;

  for (i = 0; i < len; i++) {

    buf[j + i * 2] = map[(str[i] >> 4) & 0x0f];

    buf[j + i * 2 + 1] = map[(str[i]) & 0x0f];

  }

  buf[j + i * 2] = '\n';

  buf[j + i * 2 + 1] = '\0';

}

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) {

    PEMerror(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);

}

static int

check_pem(const char *nm, const char *name)

{

  /* Normal matching nm and name */

  if (!strcmp(nm, name))

    return 1;

  /* Make PEM_STRING_EVP_PKEY match any private key */

  if (!strcmp(name, PEM_STRING_EVP_PKEY)) {

    int slen;

    const EVP_PKEY_ASN1_METHOD *ameth;

    if (!strcmp(nm, PEM_STRING_PKCS8))

      return 1;

    if (!strcmp(nm, PEM_STRING_PKCS8INF))

      return 1;

    slen = pem_check_suffix(nm, "PRIVATE KEY");

    if (slen > 0) {

      /* NB: ENGINE implementations wont 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)) {

    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;

  }

  /* Permit older strings */

  if (!strcmp(nm, PEM_STRING_X509_OLD) &&

      !strcmp(name, PEM_STRING_X509))

    return 1;

  if (!strcmp(nm, PEM_STRING_X509_REQ_OLD) &&

      !strcmp(name, PEM_STRING_X509_REQ))

    return 1;

  /* Allow normal certs to be read as trusted certs */

  if (!strcmp(nm, PEM_STRING_X509) &&

      !strcmp(name, PEM_STRING_X509_TRUSTED))

    return 1;

  if (!strcmp(nm, PEM_STRING_X509_OLD) &&

      !strcmp(name, PEM_STRING_X509_TRUSTED))

    return 1;

  /* Some CAs use PKCS#7 with CERTIFICATE headers */

  if (!strcmp(nm, PEM_STRING_X509) &&

      !strcmp(name, PEM_STRING_PKCS7))

    return 1;

  if (!strcmp(nm, PEM_STRING_PKCS7_SIGNED) &&

      !strcmp(name, PEM_STRING_PKCS7))

    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;

}

int

PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm,

    const char *name, BIO *bp, pem_password_cb *cb, void *u)

{

  EVP_CIPHER_INFO cipher;

  char *nm = NULL, *header = NULL;

  unsigned char *data = NULL;

  long len;

  int ret = 0;

  for (;;) {

    if (!PEM_read_bio(bp, &nm, &header, &data, &len)) {

      if (ERR_GET_REASON(ERR_peek_error()) ==

          PEM_R_NO_START_LINE)

        ERR_asprintf_error_data("Expecting: %s", name);

      return 0;

    }

    if (check_pem(nm, name))

      break;

    free(nm);

    free(header);

    free(data);

  }

  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)

    *pnm = nm;

  ret = 1;

err:

  if (!ret || !pnm)

    free(nm);

  free(header);

  if (!ret)

    free(data);

  return ret;

}

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) {

    PEMerror(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);

}

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;

  int dsize = 0, i, j, 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) {

      PEMerror(PEM_R_UNSUPPORTED_CIPHER);

      goto err;

    }

  }

  if ((dsize = i2d(x, NULL)) < 0) {

    PEMerror(ERR_R_ASN1_LIB);

    dsize = 0;

    goto err;

  }

  /* dzise + 8 bytes are needed */

  /* actually it needs the cipher block size extra... */

  data = malloc(dsize + 20);

  if (data == NULL) {

    PEMerror(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) {

        PEMerror(PEM_R_READ_KEY);

        goto err;

      }

      kstr = (unsigned char *)buf;

    }

    if ((size_t)enc->iv_len > sizeof(iv)) {

      PEMerror(EVP_R_IV_TOO_LARGE);

      goto err;

    }

    arc4random_buf(iv, enc->iv_len); /* Generate a salt */

    /* 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)

      explicit_bzero(buf, PEM_BUFSIZE);

    if (strlen(objstr) + 23 + 2 * enc->iv_len + 13 > sizeof buf) {

      PEMerror(ASN1_R_BUFFER_TOO_SMALL);

      goto err;

    }

    buf[0] = '\0';

    PEM_proc_type(buf, PEM_TYPE_ENCRYPTED);

    PEM_dek_info(buf, objstr, enc->iv_len, (char *)iv);

    /* k=strlen(buf); */

    EVP_CIPHER_CTX_init(&ctx);

    ret = 1;

    if (!EVP_EncryptInit_ex(&ctx, enc, NULL, key, iv) ||

        !EVP_EncryptUpdate(&ctx, data, &j, data, i) ||

        !EVP_EncryptFinal_ex(&ctx, &(data[j]), &i))

      ret = 0;

    EVP_CIPHER_CTX_cleanup(&ctx);

    if (ret == 0)

      goto err;

    i += j;

  } else {

    ret = 1;

    buf[0] = '\0';

  }

  i = PEM_write_bio(bp, name, buf, data, i);

  if (i <= 0)

    ret = 0;

err:

  explicit_bzero(key, sizeof(key));

  explicit_bzero(iv, sizeof(iv));

  explicit_bzero((char *)&ctx, sizeof(ctx));

  explicit_bzero(buf, PEM_BUFSIZE);

  freezero(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 i, j, o, klen;

  long len;

  EVP_CIPHER_CTX ctx;

  unsigned char key[EVP_MAX_KEY_LENGTH];

  char buf[PEM_BUFSIZE];

  len = *plen;

  if (cipher->cipher == NULL)

    return (1);

  if (callback == NULL)

    klen = PEM_def_callback(buf, PEM_BUFSIZE, 0, u);

  else

    klen = callback(buf, PEM_BUFSIZE, 0, u);

  if (klen <= 0) {

    PEMerror(PEM_R_BAD_PASSWORD_READ);

    return (0);

  }

  if (!EVP_BytesToKey(cipher->cipher, EVP_md5(), &(cipher->iv[0]),

      (unsigned char *)buf, klen, 1, key, NULL))

    return 0;

  j = (int)len;

  EVP_CIPHER_CTX_init(&ctx);

  o = EVP_DecryptInit_ex(&ctx, cipher->cipher, NULL, key,

      &(cipher->iv[0]));

  if (o)

    o = EVP_DecryptUpdate(&ctx, data, &i, data, j);

  if (o)

    o = EVP_DecryptFinal_ex(&ctx, &(data[i]), &j);

  EVP_CIPHER_CTX_cleanup(&ctx);

  explicit_bzero((char *)buf, sizeof(buf));

  explicit_bzero((char *)key, sizeof(key));

  if (!o) {

    PEMerror(PEM_R_BAD_DECRYPT);

    return (0);

  }

  *plen = j + i;

  return (1);

}

int

PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher)

{

  const EVP_CIPHER *enc = NULL;

  char *p, c;

  char **header_pp = &header;

  cipher->cipher = NULL;

  if ((header == NULL) || (*header == '\0') || (*header == '\n'))

    return (1);

  if (strncmp(header, "Proc-Type: ", 11) != 0) {

    PEMerror(PEM_R_NOT_PROC_TYPE);

    return (0);

  }

  header += 11;

  if (*header != '4')

    return (0);

  header++;

  if (*header != ',')

    return (0);

  header++;

  if (strncmp(header, "ENCRYPTED", 9) != 0) {

    PEMerror(PEM_R_NOT_ENCRYPTED);

    return (0);

  }

  for (; (*header != '\n') && (*header != '\0'); header++)

    ;

  if (*header == '\0') {

    PEMerror(PEM_R_SHORT_HEADER);

    return (0);

  }

  header++;

  if (strncmp(header, "DEK-Info: ", 10) != 0) {

    PEMerror(PEM_R_NOT_DEK_INFO);

    return (0);

  }

  header += 10;

  p = header;

  for (;;) {

    c= *header;

    if (!(  ((c >= 'A') && (c <= 'Z')) || (c == '-') ||

        ((c >= '0') && (c <= '9'))))

      break;

    header++;

  }

  *header = '\0';

  cipher->cipher = enc = EVP_get_cipherbyname(p);

  *header = c;

  header++;

  if (enc == NULL) {

    PEMerror(PEM_R_UNSUPPORTED_ENCRYPTION);

    return (0);

  }

  if (!load_iv(header_pp, &(cipher->iv[0]), enc->iv_len))

    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++) {

    if ((*from >= '0') && (*from <= '9'))

      v = *from - '0';

    else if ((*from >= 'A') && (*from <= 'F'))

      v = *from - 'A' + 10;

    else if ((*from >= 'a') && (*from <= 'f'))

      v = *from - 'a' + 10;

    else {

      PEMerror(PEM_R_BAD_IV_CHARS);

      return (0);

    }

    from++;

    to[i / 2] |= v << (long)((!(i & 1)) * 4);

  }

  *fromp = from;

  return (1);

}

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) {

    PEMerror(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);

}

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;

  int reason = ERR_R_BUF_LIB;

  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;

  if (header != NULL && (i = strlen(header)) > 0) {

    if ((BIO_write(bp, header, i) != i) ||

        (BIO_write(bp, "\n", 1) != 1))

      goto err;

  }

  buf = reallocarray(NULL, 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;

  freezero(buf, PEM_BUFSIZE * 8);

  buf = NULL;

  if ((BIO_write(bp, "-----END ", 9) != 9) ||

      (BIO_write(bp, name, nlen) != nlen) ||

      (BIO_write(bp, "-----\n", 6) != 6))

    goto err;

  return (i + outl);

err:

  freezero(buf, PEM_BUFSIZE * 8);

  PEMerror(reason);

  return (0);

}

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) {

    PEMerror(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);

}

int

PEM_read_bio(BIO *bp, char **name, char **header, unsigned char **data,

    long *len)

{

  EVP_ENCODE_CTX ctx;

  int end = 0, i, k, bl = 0, hl = 0, nohead = 0;

  char buf[256];

  BUF_MEM *nameB;

  BUF_MEM *headerB;

  BUF_MEM *dataB, *tmpB;

  nameB = BUF_MEM_new();

  headerB = BUF_MEM_new();

  dataB = BUF_MEM_new();

  if ((nameB == NULL) || (headerB == NULL) || (dataB == NULL)) {

    BUF_MEM_free(nameB);

    BUF_MEM_free(headerB);

    BUF_MEM_free(dataB);

    PEMerror(ERR_R_MALLOC_FAILURE);

    return (0);

  }

  buf[254] = '\0';

  for (;;) {

    i = BIO_gets(bp, buf, 254);

    if (i <= 0) {

      PEMerror(PEM_R_NO_START_LINE);

      goto err;

    }

    while ((i >= 0) && (buf[i] <= ' '))

      i--;

    buf[++i] = '\n';

    buf[++i] = '\0';

    if (strncmp(buf, "-----BEGIN ", 11) == 0) {

      i = strlen(&(buf[11]));

      if (strncmp(&(buf[11 + i - 6]), "-----\n", 6) != 0)

        continue;

      if (!BUF_MEM_grow(nameB, i + 9)) {

        PEMerror(ERR_R_MALLOC_FAILURE);

        goto err;

      }

      memcpy(nameB->data, &(buf[11]), i - 6);

      nameB->data[i - 6] = '\0';

      break;

    }

  }

  hl = 0;

  if (!BUF_MEM_grow(headerB, 256)) {

    PEMerror(ERR_R_MALLOC_FAILURE);

    goto err;

  }

  headerB->data[0] = '\0';

  for (;;) {

    i = BIO_gets(bp, buf, 254);

    if (i <= 0)

      break;

    while ((i >= 0) && (buf[i] <= ' '))

      i--;

    buf[++i] = '\n';

    buf[++i] = '\0';

    if (buf[0] == '\n')

      break;

    if (!BUF_MEM_grow(headerB, hl + i + 9)) {

      PEMerror(ERR_R_MALLOC_FAILURE);

      goto err;

    }

    if (strncmp(buf, "-----END ", 9) == 0) {

      nohead = 1;

      break;

    }

    memcpy(&(headerB->data[hl]), buf, i);

    headerB->data[hl + i] = '\0';

    hl += i;

  }

  bl = 0;

  if (!BUF_MEM_grow(dataB, 1024)) {

    PEMerror(ERR_R_MALLOC_FAILURE);

    goto err;

  }

  dataB->data[0] = '\0';

  if (!nohead) {

    for (;;) {

      i = BIO_gets(bp, buf, 254);

      if (i <= 0)

        break;

      while ((i >= 0) && (buf[i] <= ' '))

        i--;

      buf[++i] = '\n';

      buf[++i] = '\0';

      if (i != 65)

        end = 1;

      if (strncmp(buf, "-----END ", 9) == 0)

        break;

      if (i > 65)

        break;

      if (!BUF_MEM_grow_clean(dataB, i + bl + 9)) {

        PEMerror(ERR_R_MALLOC_FAILURE);

        goto err;

      }

      memcpy(&(dataB->data[bl]), buf, i);

      dataB->data[bl + i] = '\0';

      bl += i;

      if (end) {

        buf[0] = '\0';

        i = BIO_gets(bp, buf, 254);

        if (i <= 0)

          break;

        while ((i >= 0) && (buf[i] <= ' '))

          i--;

        buf[++i] = '\n';

        buf[++i] = '\0';

        break;

      }

    }

  } else {

    tmpB = headerB;

    headerB = dataB;

    dataB = tmpB;

    bl = hl;

  }

  i = strlen(nameB->data);

  if ((strncmp(buf, "-----END ", 9) != 0) ||

      (strncmp(nameB->data, &(buf[9]), i) != 0) ||

      (strncmp(&(buf[9 + i]), "-----\n", 6) != 0)) {

    PEMerror(PEM_R_BAD_END_LINE);

    goto err;

  }

  EVP_DecodeInit(&ctx);

  i = EVP_DecodeUpdate(&ctx,

      (unsigned char *)dataB->data, &bl,

      (unsigned char *)dataB->data, bl);

  if (i < 0) {

    PEMerror(PEM_R_BAD_BASE64_DECODE);

    goto err;

  }

  i = EVP_DecodeFinal(&ctx, (unsigned char *)&(dataB->data[bl]), &k);

  if (i < 0) {

    PEMerror(PEM_R_BAD_BASE64_DECODE);

    goto err;

  }

  bl += k;

  if (bl == 0)

    goto err;

  *name = nameB->data;

  *header = headerB->data;

  *data = (unsigned char *)dataB->data;

  *len = bl;

  free(nameB);

  free(headerB);

  free(dataB);

  return (1);

err:

  BUF_MEM_free(nameB);

  BUF_MEM_free(headerB);

  BUF_MEM_free(dataB);

  return (0);

}

/* 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;