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mbedtls ported to mbed-classic
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Christopher Haster
ccm.h File Reference
Counter with CBC-MAC (CCM) for 128-bit block ciphers. More...
Go to the source code of this file.
Data Structures | |
| struct | mbedtls_ccm_context |
| CCM context structure. More... | |
Functions | |
| void | mbedtls_ccm_init (mbedtls_ccm_context *ctx) |
| Initialize CCM context (just makes references valid) Makes the context ready for mbedtls_ccm_setkey() or mbedtls_ccm_free(). | |
| int | mbedtls_ccm_setkey (mbedtls_ccm_context *ctx, mbedtls_cipher_id_t cipher, const unsigned char *key, unsigned int keybits) |
| CCM initialization (encryption and decryption) | |
| void | mbedtls_ccm_free (mbedtls_ccm_context *ctx) |
| Free a CCM context and underlying cipher sub-context. | |
| int | mbedtls_ccm_encrypt_and_tag (mbedtls_ccm_context *ctx, size_t length, const unsigned char *iv, size_t iv_len, const unsigned char *add, size_t add_len, const unsigned char *input, unsigned char *output, unsigned char *tag, size_t tag_len) |
| CCM buffer encryption. | |
| int | mbedtls_ccm_auth_decrypt (mbedtls_ccm_context *ctx, size_t length, const unsigned char *iv, size_t iv_len, const unsigned char *add, size_t add_len, const unsigned char *input, unsigned char *output, const unsigned char *tag, size_t tag_len) |
| CCM buffer authenticated decryption. | |
| int | mbedtls_ccm_self_test (int verbose) |
| Checkup routine. | |
Detailed Description
Counter with CBC-MAC (CCM) for 128-bit block ciphers.
Copyright (C) 2006-2015, ARM Limited, All Rights Reserved 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.
This file is part of mbed TLS (https://tls.mbed.org)
Definition in file ccm.h.
Function Documentation
| int mbedtls_ccm_auth_decrypt | ( | mbedtls_ccm_context * | ctx, |
| size_t | length, | ||
| const unsigned char * | iv, | ||
| size_t | iv_len, | ||
| const unsigned char * | add, | ||
| size_t | add_len, | ||
| const unsigned char * | input, | ||
| unsigned char * | output, | ||
| const unsigned char * | tag, | ||
| size_t | tag_len | ||
| ) |
CCM buffer authenticated decryption.
- Parameters:
-
ctx CCM context length length of the input data iv initialization vector iv_len length of IV add additional data add_len length of additional data input buffer holding the input data output buffer for holding the output data tag buffer holding the tag tag_len length of the tag
- Returns:
- 0 if successful and authenticated, MBEDTLS_ERR_CCM_AUTH_FAILED if tag does not match
| int mbedtls_ccm_encrypt_and_tag | ( | mbedtls_ccm_context * | ctx, |
| size_t | length, | ||
| const unsigned char * | iv, | ||
| size_t | iv_len, | ||
| const unsigned char * | add, | ||
| size_t | add_len, | ||
| const unsigned char * | input, | ||
| unsigned char * | output, | ||
| unsigned char * | tag, | ||
| size_t | tag_len | ||
| ) |
CCM buffer encryption.
- Parameters:
-
ctx CCM context length length of the input data in bytes iv nonce (initialization vector) iv_len length of IV in bytes must be 2, 3, 4, 5, 6, 7 or 8 add additional data add_len length of additional data in bytes must be less than 2^16 - 2^8 input buffer holding the input data output buffer for holding the output data must be at least 'length' bytes wide tag buffer for holding the tag tag_len length of the tag to generate in bytes must be 4, 6, 8, 10, 14 or 16
- Note:
- The tag is written to a separate buffer. To get the tag concatenated with the output as in the CCM spec, use tag = output + length and make sure the output buffer is at least length + tag_len wide.
- Returns:
- 0 if successful
| void mbedtls_ccm_free | ( | mbedtls_ccm_context * | ctx ) |
| void mbedtls_ccm_init | ( | mbedtls_ccm_context * | ctx ) |
Initialize CCM context (just makes references valid) Makes the context ready for mbedtls_ccm_setkey() or mbedtls_ccm_free().
- Parameters:
-
ctx CCM context to initialize
| int mbedtls_ccm_self_test | ( | int | verbose ) |
| int mbedtls_ccm_setkey | ( | mbedtls_ccm_context * | ctx, |
| mbedtls_cipher_id_t | cipher, | ||
| const unsigned char * | key, | ||
| unsigned int | keybits | ||
| ) |
CCM initialization (encryption and decryption)
- Parameters:
-
ctx CCM context to be initialized cipher cipher to use (a 128-bit block cipher) key encryption key keybits key size in bits (must be acceptable by the cipher)
- Returns:
- 0 if successful, or a cipher specific error code
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