mbed TLS v2.16.5

gcm.h
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1
14 /*
15 * Copyright (C) 2006-2018, Arm Limited (or its affiliates), All Rights Reserved
16 * SPDX-License-Identifier: Apache-2.0
17 *
18 * Licensed under the Apache License, Version 2.0 (the "License"); you may
19 * not use this file except in compliance with the License.
20 * You may obtain a copy of the License at
21 *
22 * http://www.apache.org/licenses/LICENSE-2.0
23 *
24 * Unless required by applicable law or agreed to in writing, software
25 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
26 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
27 * See the License for the specific language governing permissions and
28 * limitations under the License.
29 *
30 * This file is part of Mbed TLS (https://tls.mbed.org)
31 */
32
33 #ifndef MBEDTLS_GCM_H
34 #define MBEDTLS_GCM_H
35
36 #if !defined(MBEDTLS_CONFIG_FILE)
37 #include "config.h"
38 #else
39 #include MBEDTLS_CONFIG_FILE
40 #endif
41
42 #include "cipher.h"
43
44 #include <stdint.h>
45
46 #define MBEDTLS_GCM_ENCRYPT 1
47 #define MBEDTLS_GCM_DECRYPT 0
48
49 #define MBEDTLS_ERR_GCM_AUTH_FAILED -0x0012
51 /* MBEDTLS_ERR_GCM_HW_ACCEL_FAILED is deprecated and should not be used. */
52 #define MBEDTLS_ERR_GCM_HW_ACCEL_FAILED -0x0013
54 #define MBEDTLS_ERR_GCM_BAD_INPUT -0x0014
56 #ifdef __cplusplus
57 extern "C" {
58 #endif
59
60 #if !defined(MBEDTLS_GCM_ALT)
61
65 typedef struct mbedtls_gcm_context
66 {
67 mbedtls_cipher_context_t cipher_ctx;
68 uint64_t HL[16];
69 uint64_t HH[16];
70 uint64_t len;
71 uint64_t add_len;
72 unsigned char base_ectr[16];
73 unsigned char y[16];
74 unsigned char buf[16];
75 int mode;
78 }
79 mbedtls_gcm_context;
80
81 #else /* !MBEDTLS_GCM_ALT */
82 #include "gcm_alt.h"
83 #endif /* !MBEDTLS_GCM_ALT */
84
96 void mbedtls_gcm_init( mbedtls_gcm_context *ctx );
97
114 int mbedtls_gcm_setkey( mbedtls_gcm_context *ctx,
115 mbedtls_cipher_id_t cipher,
116 const unsigned char *key,
117 unsigned int keybits );
118
170 int mbedtls_gcm_crypt_and_tag( mbedtls_gcm_context *ctx,
171 int mode,
172 size_t length,
173 const unsigned char *iv,
174 size_t iv_len,
175 const unsigned char *add,
176 size_t add_len,
177 const unsigned char *input,
178 unsigned char *output,
179 size_t tag_len,
180 unsigned char *tag );
181
215 int mbedtls_gcm_auth_decrypt( mbedtls_gcm_context *ctx,
216 size_t length,
217 const unsigned char *iv,
218 size_t iv_len,
219 const unsigned char *add,
220 size_t add_len,
221 const unsigned char *tag,
222 size_t tag_len,
223 const unsigned char *input,
224 unsigned char *output );
225
243 int mbedtls_gcm_starts( mbedtls_gcm_context *ctx,
244 int mode,
245 const unsigned char *iv,
246 size_t iv_len,
247 const unsigned char *add,
248 size_t add_len );
249
275 int mbedtls_gcm_update( mbedtls_gcm_context *ctx,
276 size_t length,
277 const unsigned char *input,
278 unsigned char *output );
279
296 int mbedtls_gcm_finish( mbedtls_gcm_context *ctx,
297 unsigned char *tag,
298 size_t tag_len );
299
307 void mbedtls_gcm_free( mbedtls_gcm_context *ctx );
308
309 #if defined(MBEDTLS_SELF_TEST)
310
317 int mbedtls_gcm_self_test( int verbose );
318
319 #endif /* MBEDTLS_SELF_TEST */
320
321 #ifdef __cplusplus
322 }
323 #endif
324
325
326 #endif /* gcm.h */
mbedtls_gcm_init
void mbedtls_gcm_init(mbedtls_gcm_context *ctx)
This function initializes the specified GCM context, to make references valid, and prepares the conte...
mbedtls_gcm_free
void mbedtls_gcm_free(mbedtls_gcm_context *ctx)
This function clears a GCM context and the underlying cipher sub-context.
mbedtls_gcm_context::mode
int mode
Definition: gcm.h:75
mbedtls_cipher_id_t
mbedtls_cipher_id_t
Supported cipher types.
Definition: cipher.h:84
mbedtls_gcm_context::add_len
uint64_t add_len
Definition: gcm.h:71
mbedtls_gcm_context::HL
uint64_t HL[16]
Definition: gcm.h:68
mbedtls_gcm_context
The GCM context structure.
Definition: gcm.h:65
mbedtls_gcm_context::len
uint64_t len
Definition: gcm.h:70
mbedtls_gcm_self_test
int mbedtls_gcm_self_test(int verbose)
The GCM checkup routine.
mbedtls_gcm_finish
int mbedtls_gcm_finish(mbedtls_gcm_context *ctx, unsigned char *tag, size_t tag_len)
This function finishes the GCM operation and generates the authentication tag.
cipher.h
This file contains an abstraction interface for use with the cipher primitives provided by the librar...
mbedtls_gcm_context::buf
unsigned char buf[16]
Definition: gcm.h:74
mbedtls_gcm_starts
int mbedtls_gcm_starts(mbedtls_gcm_context *ctx, int mode, const unsigned char *iv, size_t iv_len, const unsigned char *add, size_t add_len)
This function starts a GCM encryption or decryption operation.
mbedtls_gcm_crypt_and_tag
int mbedtls_gcm_crypt_and_tag(mbedtls_gcm_context *ctx, int mode, 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, size_t tag_len, unsigned char *tag)
This function performs GCM encryption or decryption of a buffer.
mbedtls_gcm_update
int mbedtls_gcm_update(mbedtls_gcm_context *ctx, size_t length, const unsigned char *input, unsigned char *output)
This function feeds an input buffer into an ongoing GCM encryption or decryption operation.
mbedtls_gcm_setkey
int mbedtls_gcm_setkey(mbedtls_gcm_context *ctx, mbedtls_cipher_id_t cipher, const unsigned char *key, unsigned int keybits)
This function associates a GCM context with a cipher algorithm and a key.
mbedtls_cipher_context_t
Definition: cipher.h:284
mbedtls_gcm_context::y
unsigned char y[16]
Definition: gcm.h:73
config.h
Configuration options (set of defines)
mbedtls_gcm_context::HH
uint64_t HH[16]
Definition: gcm.h:69
mbedtls_gcm_context
struct mbedtls_gcm_context mbedtls_gcm_context
The GCM context structure.
mbedtls_gcm_context::cipher_ctx
mbedtls_cipher_context_t cipher_ctx
Definition: gcm.h:67
mbedtls_gcm_context::base_ectr
unsigned char base_ectr[16]
Definition: gcm.h:72
mbedtls_gcm_auth_decrypt
int mbedtls_gcm_auth_decrypt(mbedtls_gcm_context *ctx, size_t length, const unsigned char *iv, size_t iv_len, const unsigned char *add, size_t add_len, const unsigned char *tag, size_t tag_len, const unsigned char *input, unsigned char *output)
This function performs a GCM authenticated decryption of a buffer.