/**
* \file pem.h
*
* \brief Privacy Enhanced Mail (PEM) decoding
*/
/*
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: GPL-2.0
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This file is part of mbed TLS (https://tls.mbed.org)
*/
#ifndef MBEDTLS_PEM_H
#define MBEDTLS_PEM_H
#if !defined(MBEDTLS_CONFIG_FILE)
#include "config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#include <stddef.h>
/**
* \name PEM Error codes
* These error codes are returned in case of errors reading the
* PEM data.
* \{
*/
#define MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT -0x1080 /**< No PEM header or footer found. */
#define MBEDTLS_ERR_PEM_INVALID_DATA -0x1100 /**< PEM string is not as expected. */
#define MBEDTLS_ERR_PEM_ALLOC_FAILED -0x1180 /**< Failed to allocate memory. */
#define MBEDTLS_ERR_PEM_INVALID_ENC_IV -0x1200 /**< RSA IV is not in hex-format. */
#define MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG -0x1280 /**< Unsupported key encryption algorithm. */
#define MBEDTLS_ERR_PEM_PASSWORD_REQUIRED -0x1300 /**< Private key password can't be empty. */
#define MBEDTLS_ERR_PEM_PASSWORD_MISMATCH -0x1380 /**< Given private key password does not allow for correct decryption. */
#define MBEDTLS_ERR_PEM_FEATURE_UNAVAILABLE -0x1400 /**< Unavailable feature, e.g. hashing/encryption combination. */
#define MBEDTLS_ERR_PEM_BAD_INPUT_DATA -0x1480 /**< Bad input parameters to function. */
/* \} name */
#ifdef __cplusplus
extern "C" {
#endif
#if defined(MBEDTLS_PEM_PARSE_C)
/**
* \brief PEM context structure
*/
typedef struct mbedtls_pem_context
{
unsigned char *buf; /*!< buffer for decoded data */
size_t buflen; /*!< length of the buffer */
unsigned char *info; /*!< buffer for extra header information */
}
mbedtls_pem_context;
/**
* \brief PEM context setup
*
* \param ctx context to be initialized
*/
void mbedtls_pem_init( mbedtls_pem_context *ctx );
/**
* \brief Read a buffer for PEM information and store the resulting
* data into the specified context buffers.
*
* \param ctx context to use
* \param header header string to seek and expect
* \param footer footer string to seek and expect
* \param data source data to look in (must be nul-terminated)
* \param pwd password for decryption (can be NULL)
* \param pwdlen length of password
* \param use_len destination for total length used (set after header is
* correctly read, so unless you get
* MBEDTLS_ERR_PEM_BAD_INPUT_DATA or
* MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT, use_len is
* the length to skip)
*
* \note Attempts to check password correctness by verifying if
* the decrypted text starts with an ASN.1 sequence of
* appropriate length
*
* \return 0 on success, or a specific PEM error code
*/
int mbedtls_pem_read_buffer( mbedtls_pem_context *ctx, const char *header, const char *footer,
const unsigned char *data,
const unsigned char *pwd,
size_t pwdlen, size_t *use_len );
/**
* \brief PEM context memory freeing
*
* \param ctx context to be freed
*/
void mbedtls_pem_free( mbedtls_pem_context *ctx );
#endif /* MBEDTLS_PEM_PARSE_C */
#if defined(MBEDTLS_PEM_WRITE_C)
/**
* \brief Write a buffer of PEM information from a DER encoded
* buffer.
*
* \param header header string to write
* \param footer footer string to write
* \param der_data DER data to write
* \param der_len length of the DER data
* \param buf buffer to write to
* \param buf_len length of output buffer
* \param olen total length written / required (if buf_len is not enough)
*
* \return 0 on success, or a specific PEM or BASE64 error code. On
* MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL olen is the required
* size.
*/
int mbedtls_pem_write_buffer( const char *header, const char *footer,
const unsigned char *der_data, size_t der_len,
unsigned char *buf, size_t buf_len, size_t *olen );
#endif /* MBEDTLS_PEM_WRITE_C */
#ifdef __cplusplus
}
#endif
#endif /* pem.h */