[398] | 1 | /**
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| 2 | * \file pem.h
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| 3 | *
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| 4 | * \brief Privacy Enhanced Mail (PEM) decoding
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| 5 | */
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| 6 | /*
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| 7 | * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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| 8 | * SPDX-License-Identifier: Apache-2.0
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| 9 | *
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| 10 | * Licensed under the Apache License, Version 2.0 (the "License"); you may
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| 11 | * not use this file except in compliance with the License.
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| 12 | * You may obtain a copy of the License at
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| 13 | *
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| 14 | * http://www.apache.org/licenses/LICENSE-2.0
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| 15 | *
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| 16 | * Unless required by applicable law or agreed to in writing, software
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| 17 | * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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| 18 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 19 | * See the License for the specific language governing permissions and
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| 20 | * limitations under the License.
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| 21 | *
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| 22 | * This file is part of mbed TLS (https://tls.mbed.org)
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| 23 | */
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| 24 | #ifndef MBEDTLS_PEM_H
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| 25 | #define MBEDTLS_PEM_H
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| 26 |
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| 27 | #if !defined(MBEDTLS_CONFIG_FILE)
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| 28 | #include "config.h"
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| 29 | #else
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| 30 | #include MBEDTLS_CONFIG_FILE
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| 31 | #endif
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| 32 |
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| 33 | #include <stddef.h>
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| 34 |
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| 35 | /**
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| 36 | * \name PEM Error codes
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| 37 | * These error codes are returned in case of errors reading the
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| 38 | * PEM data.
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| 39 | * \{
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| 40 | */
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| 41 | #define MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT -0x1080 /**< No PEM header or footer found. */
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| 42 | #define MBEDTLS_ERR_PEM_INVALID_DATA -0x1100 /**< PEM string is not as expected. */
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| 43 | #define MBEDTLS_ERR_PEM_ALLOC_FAILED -0x1180 /**< Failed to allocate memory. */
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| 44 | #define MBEDTLS_ERR_PEM_INVALID_ENC_IV -0x1200 /**< RSA IV is not in hex-format. */
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| 45 | #define MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG -0x1280 /**< Unsupported key encryption algorithm. */
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| 46 | #define MBEDTLS_ERR_PEM_PASSWORD_REQUIRED -0x1300 /**< Private key password can't be empty. */
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| 47 | #define MBEDTLS_ERR_PEM_PASSWORD_MISMATCH -0x1380 /**< Given private key password does not allow for correct decryption. */
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| 48 | #define MBEDTLS_ERR_PEM_FEATURE_UNAVAILABLE -0x1400 /**< Unavailable feature, e.g. hashing/encryption combination. */
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| 49 | #define MBEDTLS_ERR_PEM_BAD_INPUT_DATA -0x1480 /**< Bad input parameters to function. */
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| 50 | /* \} name */
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| 51 |
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| 52 | #ifdef __cplusplus
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| 53 | extern "C" {
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| 54 | #endif
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| 55 |
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| 56 | #if defined(MBEDTLS_PEM_PARSE_C)
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| 57 | /**
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| 58 | * \brief PEM context structure
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| 59 | */
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| 60 | typedef struct mbedtls_pem_context
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| 61 | {
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| 62 | unsigned char *buf; /*!< buffer for decoded data */
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| 63 | size_t buflen; /*!< length of the buffer */
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| 64 | unsigned char *info; /*!< buffer for extra header information */
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| 65 | }
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| 66 | mbedtls_pem_context;
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| 67 |
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| 68 | /**
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| 69 | * \brief PEM context setup
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| 70 | *
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| 71 | * \param ctx context to be initialized
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| 72 | */
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| 73 | void mbedtls_pem_init( mbedtls_pem_context *ctx );
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| 74 |
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| 75 | /**
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| 76 | * \brief Read a buffer for PEM information and store the resulting
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| 77 | * data into the specified context buffers.
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| 78 | *
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| 79 | * \param ctx context to use
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| 80 | * \param header header string to seek and expect
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| 81 | * \param footer footer string to seek and expect
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| 82 | * \param data source data to look in (must be nul-terminated)
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| 83 | * \param pwd password for decryption (can be NULL)
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| 84 | * \param pwdlen length of password
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| 85 | * \param use_len destination for total length used (set after header is
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| 86 | * correctly read, so unless you get
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| 87 | * MBEDTLS_ERR_PEM_BAD_INPUT_DATA or
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| 88 | * MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT, use_len is
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| 89 | * the length to skip)
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| 90 | *
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| 91 | * \note Attempts to check password correctness by verifying if
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| 92 | * the decrypted text starts with an ASN.1 sequence of
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| 93 | * appropriate length
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| 94 | *
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| 95 | * \return 0 on success, or a specific PEM error code
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| 96 | */
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| 97 | int mbedtls_pem_read_buffer( mbedtls_pem_context *ctx, const char *header, const char *footer,
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| 98 | const unsigned char *data,
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| 99 | const unsigned char *pwd,
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| 100 | size_t pwdlen, size_t *use_len );
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| 101 |
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| 102 | /**
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| 103 | * \brief PEM context memory freeing
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| 104 | *
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| 105 | * \param ctx context to be freed
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| 106 | */
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| 107 | void mbedtls_pem_free( mbedtls_pem_context *ctx );
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| 108 | #endif /* MBEDTLS_PEM_PARSE_C */
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| 109 |
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| 110 | #if defined(MBEDTLS_PEM_WRITE_C)
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| 111 | /**
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| 112 | * \brief Write a buffer of PEM information from a DER encoded
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| 113 | * buffer.
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| 114 | *
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| 115 | * \param header header string to write
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| 116 | * \param footer footer string to write
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| 117 | * \param der_data DER data to write
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| 118 | * \param der_len length of the DER data
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| 119 | * \param buf buffer to write to
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| 120 | * \param buf_len length of output buffer
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| 121 | * \param olen total length written / required (if buf_len is not enough)
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| 122 | *
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| 123 | * \return 0 on success, or a specific PEM or BASE64 error code. On
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| 124 | * MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL olen is the required
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| 125 | * size.
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| 126 | */
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| 127 | int mbedtls_pem_write_buffer( const char *header, const char *footer,
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| 128 | const unsigned char *der_data, size_t der_len,
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| 129 | unsigned char *buf, size_t buf_len, size_t *olen );
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| 130 | #endif /* MBEDTLS_PEM_WRITE_C */
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| 131 |
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| 132 | #ifdef __cplusplus
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| 133 | }
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| 134 | #endif
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| 135 |
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| 136 | #endif /* pem.h */
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