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