pem.h 4.8 KB

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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: Apache-2.0
  9. *
  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
  13. *
  14. * http://www.apache.org/licenses/LICENSE-2.0
  15. *
  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.
  21. *
  22. * This file is part of mbed TLS (https://tls.mbed.org)
  23. */
  24. #ifndef MBEDTLS_PEM_H
  25. #define MBEDTLS_PEM_H
  26. #include <stddef.h>
  27. /**
  28. * \name PEM Error codes
  29. * These error codes are returned in case of errors reading the
  30. * PEM data.
  31. * \{
  32. */
  33. #define MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT -0x1080 /**< No PEM header or footer found. */
  34. #define MBEDTLS_ERR_PEM_INVALID_DATA -0x1100 /**< PEM string is not as expected. */
  35. #define MBEDTLS_ERR_PEM_ALLOC_FAILED -0x1180 /**< Failed to allocate memory. */
  36. #define MBEDTLS_ERR_PEM_INVALID_ENC_IV -0x1200 /**< RSA IV is not in hex-format. */
  37. #define MBEDTLS_ERR_PEM_UNKNOWN_ENC_ALG -0x1280 /**< Unsupported key encryption algorithm. */
  38. #define MBEDTLS_ERR_PEM_PASSWORD_REQUIRED -0x1300 /**< Private key password can't be empty. */
  39. #define MBEDTLS_ERR_PEM_PASSWORD_MISMATCH -0x1380 /**< Given private key password does not allow for correct decryption. */
  40. #define MBEDTLS_ERR_PEM_FEATURE_UNAVAILABLE -0x1400 /**< Unavailable feature, e.g. hashing/encryption combination. */
  41. #define MBEDTLS_ERR_PEM_BAD_INPUT_DATA -0x1480 /**< Bad input parameters to function. */
  42. /* \} name */
  43. #ifdef __cplusplus
  44. extern "C" {
  45. #endif
  46. #if defined(MBEDTLS_PEM_PARSE_C)
  47. /**
  48. * \brief PEM context structure
  49. */
  50. typedef struct
  51. {
  52. unsigned char *buf; /*!< buffer for decoded data */
  53. size_t buflen; /*!< length of the buffer */
  54. unsigned char *info; /*!< buffer for extra header information */
  55. }
  56. mbedtls_pem_context;
  57. /**
  58. * \brief PEM context setup
  59. *
  60. * \param ctx context to be initialized
  61. */
  62. void mbedtls_pem_init( mbedtls_pem_context *ctx );
  63. /**
  64. * \brief Read a buffer for PEM information and store the resulting
  65. * data into the specified context buffers.
  66. *
  67. * \param ctx context to use
  68. * \param header header string to seek and expect
  69. * \param footer footer string to seek and expect
  70. * \param data source data to look in (must be nul-terminated)
  71. * \param pwd password for decryption (can be NULL)
  72. * \param pwdlen length of password
  73. * \param use_len destination for total length used (set after header is
  74. * correctly read, so unless you get
  75. * MBEDTLS_ERR_PEM_BAD_INPUT_DATA or
  76. * MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT, use_len is
  77. * the length to skip)
  78. *
  79. * \note Attempts to check password correctness by verifying if
  80. * the decrypted text starts with an ASN.1 sequence of
  81. * appropriate length
  82. *
  83. * \return 0 on success, or a specific PEM error code
  84. */
  85. int mbedtls_pem_read_buffer( mbedtls_pem_context *ctx, const char *header, const char *footer,
  86. const unsigned char *data,
  87. const unsigned char *pwd,
  88. size_t pwdlen, size_t *use_len );
  89. /**
  90. * \brief PEM context memory freeing
  91. *
  92. * \param ctx context to be freed
  93. */
  94. void mbedtls_pem_free( mbedtls_pem_context *ctx );
  95. #endif /* MBEDTLS_PEM_PARSE_C */
  96. #if defined(MBEDTLS_PEM_WRITE_C)
  97. /**
  98. * \brief Write a buffer of PEM information from a DER encoded
  99. * buffer.
  100. *
  101. * \param header header string to write
  102. * \param footer footer string to write
  103. * \param der_data DER data to write
  104. * \param der_len length of the DER data
  105. * \param buf buffer to write to
  106. * \param buf_len length of output buffer
  107. * \param olen total length written / required (if buf_len is not enough)
  108. *
  109. * \return 0 on success, or a specific PEM or BASE64 error code. On
  110. * MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL olen is the required
  111. * size.
  112. */
  113. int mbedtls_pem_write_buffer( const char *header, const char *footer,
  114. const unsigned char *der_data, size_t der_len,
  115. unsigned char *buf, size_t buf_len, size_t *olen );
  116. #endif /* MBEDTLS_PEM_WRITE_C */
  117. #ifdef __cplusplus
  118. }
  119. #endif
  120. #endif /* pem.h */