/* $OpenBSD: pem_lib.c,v 1.57 2025/05/10 05:54:38 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/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

#include "asn1_local.h"
#include "err_local.h"
#include "evp_local.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;
}
LCRYPTO_ALIAS(PEM_def_callback);

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);
}
LCRYPTO_ALIAS(PEM_proc_type);

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';
}
LCRYPTO_ALIAS(PEM_dek_info);

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);
}
LCRYPTO_ALIAS(PEM_ASN1_read);

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) {
                        ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen);
                        if (ameth) {
                                int r;
                                if (ameth->param_decode)
                                        r = 1;
                                else
                                        r = 0;
                                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;
}
LCRYPTO_ALIAS(PEM_bytes_read_bio);

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);
}
LCRYPTO_ALIAS(PEM_ASN1_write);

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_legacy_clear(&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);
}
LCRYPTO_ALIAS(PEM_ASN1_write_bio);

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_legacy_clear(&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);
}
LCRYPTO_ALIAS(PEM_do_header);

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);
}
LCRYPTO_ALIAS(PEM_get_EVP_CIPHER_INFO);

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);
}
LCRYPTO_ALIAS(PEM_write);

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);
}
LCRYPTO_ALIAS(PEM_write_bio);

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);
}
LCRYPTO_ALIAS(PEM_read);

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);
}
LCRYPTO_ALIAS(PEM_read_bio);

/* 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;
}