/** * \file pem.h * * \brief Privacy Enhanced Mail (PEM) decoding */ /* * Copyright The Mbed TLS Contributors * SPDX-License-Identifier: Apache-2.0 * * Licensed under the Apache License, Version 2.0 (the "License"); you may * not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #ifndef MBEDTLS_PEM_H #define MBEDTLS_PEM_H #if !defined(MBEDTLS_CONFIG_FILE) #include "mbedtls/config.h" #else #include MBEDTLS_CONFIG_FILE #endif #include /** * \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 The header string to write. * \param footer The footer string to write. * \param der_data The DER data to encode. * \param der_len The length of the DER data \p der_data in Bytes. * \param buf The buffer to write to. * \param buf_len The length of the output buffer \p buf in Bytes. * \param olen The address at which to store the total length written * or required (if \p buf_len is not enough). * * \note You may pass \c NULL for \p buf and \c 0 for \p buf_len * to request the length of the resulting PEM buffer in * `*olen`. * * \note This function may be called with overlapping \p der_data * and \p buf buffers. * * \return \c 0 on success. * \return #MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL if \p buf isn't large * enough to hold the PEM buffer. In this case, `*olen` holds * the required minimum size of \p buf. * \return Another PEM or BASE64 error code on other kinds of failure. */ 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 */