/* 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 <ctype.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>

#include "asn1_locl.h"

#ifndef OPENSSL_NO_DES

# include <openssl/des.h>

#endif

#ifndef OPENSSL_NO_ENGINE

# include <openssl/engine.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_check_suffix(const char *pem_str, const char *suffix);

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 (;;) {

        /*

         * We assume that w == 0 means decryption,

         * while w == 1 means encryption

         */

        int min_len = w ? MIN_LENGTH : 0;

        i = EVP_read_pw_string_min(buf, min_len, 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 (min_len && j < min_len) {

            fprintf(stderr,

                    "phrase is too short, needs to be at least %d chars\n",

                    min_len);

        } 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(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

                if (e)

                    ENGINE_finish(e);

#endif

                return r;

            }

        }

        return 0;

    }

    /* If reading DH parameters handle X9.42 DH format too */

    if (!strcmp(nm, PEM_STRING_DHXPARAMS) &&

        !strcmp(name, PEM_STRING_DHPARAMS))

        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;

#ifndef OPENSSL_NO_CMS

    if (!strcmp(nm, PEM_STRING_X509) && !strcmp(name, PEM_STRING_CMS))

        return 1;

    /* Allow CMS to be read from PKCS#7 headers */

    if (!strcmp(nm, PEM_STRING_PKCS7) && !strcmp(name, PEM_STRING_CMS))

        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_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,

                   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;

    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 || EVP_CIPHER_iv_length(enc) == 0) {

            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_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

         */

        if (!EVP_BytesToKey(enc, EVP_md5(), iv, kstr, klen, 1, key, NULL))

            goto err;

        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);

        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:

    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 = 0, 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

    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);

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

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

    if (o)

        j += i;

    else {

        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)

{

    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((unsigned char)c) || (c == '-')

            || isdigit((unsigned char)c)))

            break;

#endif

        header++;

    }

    *header = '\0';

    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, 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;

    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);

}

/*

 * 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;

}