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pem_lib.c

/* crypto/pem/pem_lib.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 <stdio.h>
#include "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>
#ifndef OPENSSL_NO_DES
#include <openssl/des.h>
#endif

const char PEM_version[]="PEM" OPENSSL_VERSION_PTEXT;

#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_def_callback(char *buf, int num, int w, void *key)
      {
#ifdef OPENSSL_NO_FP_API
      /* We should not ever call the default callback routine from
       * windows. */
      PEMerr(PEM_F_PEM_DEF_CALLBACK,ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
      return(-1);
#else
      int i,j;
      const char *prompt;
      if(key) {
            i=strlen(key);
            i=(i > num)?num:i;
            memcpy(buf,key,i);
            return(i);
      }

      prompt=EVP_get_pw_prompt();
      if (prompt == NULL)
            prompt="Enter PEM pass phrase:";

      for (;;)
            {
            i=EVP_read_pw_string(buf,num,prompt,w);
            if (i != 0)
                  {
                  PEMerr(PEM_F_PEM_DEF_CALLBACK,PEM_R_PROBLEMS_GETTING_PASSWORD);
                  memset(buf,0,(unsigned int)num);
                  return(-1);
                  }
            j=strlen(buf);
            if (j < MIN_LENGTH)
                  {
                  fprintf(stderr,"phrase is too short, needs to be at least %d chars\n",MIN_LENGTH);
                  }
            else
                  break;
            }
      return(j);
#endif
      }

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";
            
      BUF_strlcat(buf,"Proc-Type: 4,",PEM_BUFSIZE);
      BUF_strlcat(buf,str,PEM_BUFSIZE);
      BUF_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;

      BUF_strlcat(buf,"DEK-Info: ",PEM_BUFSIZE);
      BUF_strlcat(buf,type,PEM_BUFSIZE);
      BUF_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';
      }

#ifndef OPENSSL_NO_FP_API
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)) return 1;

      /* Make PEM_STRING_EVP_PKEY match any private key */

      if(!strcmp(nm,PEM_STRING_PKCS8) &&
            !strcmp(name,PEM_STRING_EVP_PKEY)) return 1;

      if(!strcmp(nm,PEM_STRING_PKCS8INF) &&
             !strcmp(name,PEM_STRING_EVP_PKEY)) return 1;

      if(!strcmp(nm,PEM_STRING_RSA) &&
            !strcmp(name,PEM_STRING_EVP_PKEY)) return 1;

      if(!strcmp(nm,PEM_STRING_DSA) &&
             !strcmp(name,PEM_STRING_EVP_PKEY)) return 1;

      if(!strcmp(nm,PEM_STRING_ECPRIVATEKEY) &&
             !strcmp(name,PEM_STRING_EVP_PKEY)) return 1;
      /* 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;

      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_add_error_data(2, "Expecting: ", name);
                  return 0;
            }
            if(check_pem(nm, name)) break;
            OPENSSL_free(nm);
            OPENSSL_free(header);
            OPENSSL_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) OPENSSL_free(nm);
      OPENSSL_free(header);
      if (!ret) OPENSSL_free(data);
      return ret;
      }

#ifndef OPENSSL_NO_FP_API
int PEM_ASN1_write(i2d_of_void *i2d, const char *name, FILE *fp,
               char *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,
                   char *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)
                  {
                  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;
            }
      /* dzise + 8 bytes are needed */
      /* actually it needs the cipher block size extra... */
      data=(unsigned char *)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;
                  }
            RAND_add(data,i,0);/* put in the RSA key. */
            OPENSSL_assert(enc->iv_len <= (int)sizeof(iv));
            if (RAND_pseudo_bytes(iv,enc->iv_len) < 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 */
            EVP_BytesToKey(enc,EVP_md5(),iv,kstr,klen,1,key,NULL);

            if (kstr == (unsigned char *)buf) OPENSSL_cleanse(buf,PEM_BUFSIZE);

            OPENSSL_assert(strlen(objstr)+23+2*enc->iv_len+13 <= sizeof buf);

            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);
            EVP_EncryptInit_ex(&ctx,enc,NULL,key,iv);
            EVP_EncryptUpdate(&ctx,data,&j,data,i);
            EVP_EncryptFinal_ex(&ctx,&(data[j]),&i);
            EVP_CIPHER_CTX_cleanup(&ctx);
            i+=j;
            ret=1;
            }
      else
            {
            ret=1;
            buf[0]='\0';
            }
      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));
      OPENSSL_cleanse((char *)&ctx,sizeof(ctx));
      OPENSSL_cleanse(buf,PEM_BUFSIZE);
      if (data != NULL)
            {
            OPENSSL_cleanse(data,(unsigned int)dsize);
            OPENSSL_free(data);
            }
      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)
            {
            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, klen);
#endif

      EVP_BytesToKey(cipher->cipher,EVP_md5(),&(cipher->iv[0]),
            (unsigned char *)buf,klen,1,key,NULL);

      j=(int)len;
      EVP_CIPHER_CTX_init(&ctx);
      EVP_DecryptInit_ex(&ctx,cipher->cipher,NULL, key,&(cipher->iv[0]));
      EVP_DecryptUpdate(&ctx,data,&i,data,j);
      o=EVP_DecryptFinal_ex(&ctx,&(data[i]),&j);
      EVP_CIPHER_CTX_cleanup(&ctx);
      OPENSSL_cleanse((char *)buf,sizeof(buf));
      OPENSSL_cleanse((char *)key,sizeof(key));
      j+=i;
      if (!o)
            {
            PEMerr(PEM_F_PEM_DO_HEADER,PEM_R_BAD_DECRYPT);
            return(0);
            }
      *plen=j;
      return(1);
      }

int PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher)
      {
      int o;
      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)
            { PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO,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)
            { PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO,PEM_R_NOT_ENCRYPTED); return(0); }
      for (; (*header != '\n') && (*header != '\0'); header++)
            ;
      if (*header == '\0')
            { PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO,PEM_R_SHORT_HEADER); return(0); }
      header++;
      if (strncmp(header,"DEK-Info: ",10) != 0)
            { PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO,PEM_R_NOT_DEK_INFO); return(0); }
      header+=10;

      p=header;
      for (;;)
            {
            c= *header;
#ifndef CHARSET_EBCDIC
            if (!(      ((c >= 'A') && (c <= 'Z')) || (c == '-') ||
                  ((c >= '0') && (c <= '9'))))
                  break;
#else
            if (!(      isupper(c) || (c == '-') ||
                  isdigit(c)))
                  break;
#endif
            header++;
            }
      *header='\0';
      o=OBJ_sn2nid(p);
      cipher->cipher=enc=EVP_get_cipherbyname(p);
      *header=c;
      header++;

      if (enc == NULL)
            {
            PEMerr(PEM_F_PEM_GET_EVP_CIPHER_INFO,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
                  {
                  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_FP_API
int PEM_write(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_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, char *header, 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;
            
      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);
            EVP_EncodeUpdate(&ctx,buf,&outl,&(data[j]),n);
            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;
      OPENSSL_cleanse(buf, PEM_BUFSIZE*8);
      OPENSSL_free(buf);
      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:
      if (buf) {
            OPENSSL_cleanse(buf, PEM_BUFSIZE*8);
            OPENSSL_free(buf);
      }
      PEMerr(PEM_F_PEM_WRITE_BIO,reason);
      return(0);
      }

#ifndef OPENSSL_NO_FP_API
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

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);
            PEMerr(PEM_F_PEM_READ_BIO,ERR_R_MALLOC_FAILURE);
            return(0);
            }

      buf[254]='\0';
      for (;;)
            {
            i=BIO_gets(bp,buf,254);

            if (i <= 0)
                  {
                  PEMerr(PEM_F_PEM_READ_BIO,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))
                        {
                        PEMerr(PEM_F_PEM_READ_BIO,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))
            { PEMerr(PEM_F_PEM_READ_BIO,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))
                  { PEMerr(PEM_F_PEM_READ_BIO,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))
            { PEMerr(PEM_F_PEM_READ_BIO,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))
                        {
                        PEMerr(PEM_F_PEM_READ_BIO,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))
            {
            PEMerr(PEM_F_PEM_READ_BIO,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)
            {
            PEMerr(PEM_F_PEM_READ_BIO,PEM_R_BAD_BASE64_DECODE);
            goto err;
            }
      i=EVP_DecodeFinal(&ctx,(unsigned char *)&(dataB->data[bl]),&k);
      if (i < 0)
            {
            PEMerr(PEM_F_PEM_READ_BIO,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;
      OPENSSL_free(nameB);
      OPENSSL_free(headerB);
      OPENSSL_free(dataB);
      return(1);
err:
      BUF_MEM_free(nameB);
      BUF_MEM_free(headerB);
      BUF_MEM_free(dataB);
      return(0);
      }

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