137 lines
4.9 KiB
C
137 lines
4.9 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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/*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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#ifndef MBEDTLS_PEM_H
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#define MBEDTLS_PEM_H
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#include <stddef.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 MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT -0x1080 /**< No PEM header or footer found. */
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#define MBEDTLS_ERR_PEM_INVALID_DATA -0x1100 /**< PEM string is not as expected. */
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#define MBEDTLS_ERR_PEM_ALLOC_FAILED -0x1180 /**< Failed to allocate memory. */
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#define MBEDTLS_ERR_PEM_INVALID_ENC_IV -0x1200 /**< RSA IV is not in hex-format. */
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#define MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG -0x1280 /**< Unsupported key encryption algorithm. */
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#define MBEDTLS_ERR_PEM_PASSWORD_REQUIRED -0x1300 /**< Private key password can't be empty. */
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#define MBEDTLS_ERR_PEM_PASSWORD_MISMATCH -0x1380 /**< Given private key password does not allow for correct decryption. */
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#define MBEDTLS_ERR_PEM_FEATURE_UNAVAILABLE -0x1400 /**< Unavailable feature, e.g. hashing/encryption combination. */
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#define MBEDTLS_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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#if defined(MBEDTLS_PEM_PARSE_C)
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/**
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* \brief PEM context structure
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*/
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typedef struct mbedtls_pem_context
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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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mbedtls_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 mbedtls_pem_init( mbedtls_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 (must be nul-terminated)
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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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* MBEDTLS_ERR_PEM_BAD_INPUT_DATA or
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* MBEDTLS_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, or a specific PEM error code
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*/
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int mbedtls_pem_read_buffer( mbedtls_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 mbedtls_pem_free( mbedtls_pem_context *ctx );
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#endif /* MBEDTLS_PEM_PARSE_C */
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#if defined(MBEDTLS_PEM_WRITE_C)
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/**
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* \brief Write a buffer of PEM information from a DER encoded
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* buffer.
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*
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* \param header header string to write
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* \param footer footer string to write
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* \param der_data DER data to write
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* \param der_len length of the DER data
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* \param buf buffer to write to
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* \param buf_len length of output buffer
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* \param olen total length written / required (if buf_len is not enough)
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*
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* \return 0 on success, or a specific PEM or BASE64 error code. On
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* MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL olen is the required
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* size.
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*/
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int mbedtls_pem_write_buffer( const char *header, const char *footer,
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const unsigned char *der_data, size_t der_len,
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unsigned char *buf, size_t buf_len, size_t *olen );
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#endif /* MBEDTLS_PEM_WRITE_C */
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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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