/* $OpenBSD: pem_lib.c,v 1.48 2018/08/24 19:48:39 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"

#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;


	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;

	i = strlen(header);
	if (i > 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;
	if (strcmp(p, suffix))
		return 0;
	p--;
	if (*p != ' ')
		return 0;
	return p - pem_str;
}
