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110 lines
4 KiB
C
110 lines
4 KiB
C
/**
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* \file pem.h
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*
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* \brief Privacy Enhanced Mail (PEM) decoding
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*
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* Copyright (C) 2006-2013, Brainspark B.V.
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*
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* This file is part of PolarSSL (http://www.polarssl.org)
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* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef POLARSSL_PEM_H
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#define POLARSSL_PEM_H
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#include <string.h>
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/**
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* \name PEM Error codes
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* These error codes are returned in case of errors reading the
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* PEM data.
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* \{
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*/
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#define POLARSSL_ERR_PEM_NO_HEADER_FOOTER_PRESENT -0x1080 /**< No PEM header or footer found. */
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#define POLARSSL_ERR_PEM_INVALID_DATA -0x1100 /**< PEM string is not as expected. */
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#define POLARSSL_ERR_PEM_MALLOC_FAILED -0x1180 /**< Failed to allocate memory. */
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#define POLARSSL_ERR_PEM_INVALID_ENC_IV -0x1200 /**< RSA IV is not in hex-format. */
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#define POLARSSL_ERR_PEM_UNKNOWN_ENC_ALG -0x1280 /**< Unsupported key encryption algorithm. */
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#define POLARSSL_ERR_PEM_PASSWORD_REQUIRED -0x1300 /**< Private key password can't be empty. */
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#define POLARSSL_ERR_PEM_PASSWORD_MISMATCH -0x1380 /**< Given private key password does not allow for correct decryption. */
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#define POLARSSL_ERR_PEM_FEATURE_UNAVAILABLE -0x1400 /**< Unavailable feature, e.g. hashing/encryption combination. */
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#define POLARSSL_ERR_PEM_BAD_INPUT_DATA -0x1480 /**< Bad input parameters to function. */
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/* \} name */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \brief PEM context structure
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*/
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typedef struct
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{
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unsigned char *buf; /*!< buffer for decoded data */
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size_t buflen; /*!< length of the buffer */
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unsigned char *info; /*!< buffer for extra header information */
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}
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pem_context;
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/**
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* \brief PEM context setup
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*
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* \param ctx context to be initialized
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*/
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void pem_init( pem_context *ctx );
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/**
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* \brief Read a buffer for PEM information and store the resulting
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* data into the specified context buffers.
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*
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* \param ctx context to use
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* \param header header string to seek and expect
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* \param footer footer string to seek and expect
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* \param data source data to look in
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* \param pwd password for decryption (can be NULL)
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* \param pwdlen length of password
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* \param use_len destination for total length used (set after header is
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* correctly read, so unless you get
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* POLARSSL_ERR_PEM_BAD_INPUT_DATA or
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* POLARSSL_ERR_PEM_NO_HEADER_FOOTER_PRESENT, use_len is
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* the length to skip)
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*
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* \note Attempts to check password correctness by verifying if
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* the decrypted text starts with an ASN.1 sequence of
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* appropriate length
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*
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* \return 0 on success, ior a specific PEM error code
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*/
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int pem_read_buffer( pem_context *ctx, const char *header, const char *footer,
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const unsigned char *data,
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const unsigned char *pwd,
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size_t pwdlen, size_t *use_len );
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/**
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* \brief PEM context memory freeing
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*
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* \param ctx context to be freed
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*/
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void pem_free( pem_context *ctx );
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#ifdef __cplusplus
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}
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#endif
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#endif /* pem.h */
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