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   1 /**
   2  * \file pem.h
   3  *
   4  * \brief Privacy Enhanced Mail (PEM) decoding
   5  */
   6 /*
   7  *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
   8  *  SPDX-License-Identifier: GPL-2.0
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or
  13  *  (at your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful,
  16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *  GNU General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License along
  21  *  with this program; if not, write to the Free Software Foundation, Inc.,
  22  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  23  *
  24  *  This file is part of mbed TLS (https://tls.mbed.org)
  25  */
  26 #ifndef MBEDTLS_PEM_H
  27 #define MBEDTLS_PEM_H
  28
  29 #include <stddef.h>
  30
  31 /**
  32  * \name PEM Error codes
  33  * These error codes are returned in case of errors reading the
  34  * PEM data.
  35  * \{
  36  */
  37 #define MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT          -0x1080  /**< No PEM header or footer found. */
  38 #define MBEDTLS_ERR_PEM_INVALID_DATA                      -0x1100  /**< PEM string is not as expected. */
  39 #define MBEDTLS_ERR_PEM_ALLOC_FAILED                      -0x1180  /**< Failed to allocate memory. */
  40 #define MBEDTLS_ERR_PEM_INVALID_ENC_IV                    -0x1200  /**< RSA IV is not in hex-format. */
  41 #define MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG                   -0x1280  /**< Unsupported key encryption algorithm. */
  42 #define MBEDTLS_ERR_PEM_PASSWORD_REQUIRED                 -0x1300  /**< Private key password can't be empty. */
  43 #define MBEDTLS_ERR_PEM_PASSWORD_MISMATCH                 -0x1380  /**< Given private key password does not allow for correct decryption. */
  44 #define MBEDTLS_ERR_PEM_FEATURE_UNAVAILABLE               -0x1400  /**< Unavailable feature, e.g. hashing/encryption combination. */
  45 #define MBEDTLS_ERR_PEM_BAD_INPUT_DATA                    -0x1480  /**< Bad input parameters to function. */
  46 /* \} name */
  47
  48 #ifdef __cplusplus
  49 extern "C" {
  50 #endif
  51
  52 #if defined(MBEDTLS_PEM_PARSE_C)
  53 /**
  54  * \brief       PEM context structure
  55  */
  56 typedef struct mbedtls_pem_context
  57 {
  58     unsigned char *buf;     /*!< buffer for decoded data             */
  59     size_t buflen;          /*!< length of the buffer                */
  60     unsigned char *info;    /*!< buffer for extra header information */
  61 }
  62 mbedtls_pem_context;
  63
  64 /**
  65  * \brief       PEM context setup
  66  *
  67  * \param ctx   context to be initialized
  68  */
  69 void mbedtls_pem_init( mbedtls_pem_context *ctx );
  70
  71 /**
  72  * \brief       Read a buffer for PEM information and store the resulting
  73  *              data into the specified context buffers.
  74  *
  75  * \param ctx       context to use
  76  * \param header    header string to seek and expect
  77  * \param footer    footer string to seek and expect
  78  * \param data      source data to look in (must be nul-terminated)
  79  * \param pwd       password for decryption (can be NULL)
  80  * \param pwdlen    length of password
  81  * \param use_len   destination for total length used (set after header is
  82  *                  correctly read, so unless you get
  83  *                  MBEDTLS_ERR_PEM_BAD_INPUT_DATA or
  84  *                  MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT, use_len is
  85  *                  the length to skip)
  86  *
  87  * \note            Attempts to check password correctness by verifying if
  88  *                  the decrypted text starts with an ASN.1 sequence of
  89  *                  appropriate length
  90  *
  91  * \return          0 on success, or a specific PEM error code
  92  */
  93 int mbedtls_pem_read_buffer( mbedtls_pem_context *ctx, const char *header, const char *footer,
  94                      const unsigned char *data,
  95                      const unsigned char *pwd,
  96                      size_t pwdlen, size_t *use_len );
  97
  98 /**
  99  * \brief       PEM context memory freeing
 100  *
 101  * \param ctx   context to be freed
 102  */
 103 void mbedtls_pem_free( mbedtls_pem_context *ctx );
 104 #endif /* MBEDTLS_PEM_PARSE_C */
 105
 106 #if defined(MBEDTLS_PEM_WRITE_C)
 107 /**
 108  * \brief           Write a buffer of PEM information from a DER encoded
 109  *                  buffer.
 110  *
 111  * \param header    header string to write
 112  * \param footer    footer string to write
 113  * \param der_data  DER data to write
 114  * \param der_len   length of the DER data
 115  * \param buf       buffer to write to
 116  * \param buf_len   length of output buffer
 117  * \param olen      total length written / required (if buf_len is not enough)
 118  *
 119  * \return          0 on success, or a specific PEM or BASE64 error code. On
 120  *                  MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL olen is the required
 121  *                  size.
 122  */
 123 int mbedtls_pem_write_buffer( const char *header, const char *footer,
 124                       const unsigned char *der_data, size_t der_len,
 125                       unsigned char *buf, size_t buf_len, size_t *olen );
 126 #endif /* MBEDTLS_PEM_WRITE_C */
 127
 128 #ifdef __cplusplus
 129 }
 130 #endif
 131
 132 #endif /* pem.h */