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1 | /* |
2 | * Copyright (c) 2013, Kenneth MacKay | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions are | |
7 | * met: | |
8 | * * Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * * Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * | |
14 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
15 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
16 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
17 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
18 | * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
19 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
20 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
21 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
22 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
24 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
25 | */ | |
26 | #ifndef _CRYPTO_ECC_H | |
27 | #define _CRYPTO_ECC_H | |
28 | ||
29 | #define ECC_MAX_DIGITS 4 /* 256 */ | |
30 | ||
31 | #define ECC_DIGITS_TO_BYTES_SHIFT 3 | |
32 | ||
33 | /** | |
34 | * ecc_is_key_valid() - Validate a given ECDH private key | |
35 | * | |
36 | * @curve_id: id representing the curve to use | |
37 | * @ndigits: curve number of digits | |
38 | * @private_key: private key to be used for the given curve | |
39 | * @private_key_len: private key len | |
40 | * | |
41 | * Returns 0 if the key is acceptable, a negative value otherwise | |
42 | */ | |
43 | int ecc_is_key_valid(unsigned int curve_id, unsigned int ndigits, | |
44 | const u8 *private_key, unsigned int private_key_len); | |
45 | ||
46 | /** | |
47 | * ecdh_make_pub_key() - Compute an ECC public key | |
48 | * | |
49 | * @curve_id: id representing the curve to use | |
50 | * @private_key: pregenerated private key for the given curve | |
51 | * @private_key_len: length of private_key | |
52 | * @public_key: buffer for storing the public key generated | |
53 | * @public_key_len: length of the public_key buffer | |
54 | * | |
55 | * Returns 0 if the public key was generated successfully, a negative value | |
56 | * if an error occurred. | |
57 | */ | |
58 | int ecdh_make_pub_key(const unsigned int curve_id, unsigned int ndigits, | |
59 | const u8 *private_key, unsigned int private_key_len, | |
60 | u8 *public_key, unsigned int public_key_len); | |
61 | ||
62 | /** | |
8f44df15 | 63 | * crypto_ecdh_shared_secret() - Compute a shared secret |
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64 | * |
65 | * @curve_id: id representing the curve to use | |
66 | * @private_key: private key of part A | |
67 | * @private_key_len: length of private_key | |
68 | * @public_key: public key of counterpart B | |
69 | * @public_key_len: length of public_key | |
70 | * @secret: buffer for storing the calculated shared secret | |
71 | * @secret_len: length of the secret buffer | |
72 | * | |
8f44df15 | 73 | * Note: It is recommended that you hash the result of crypto_ecdh_shared_secret |
3c4b2390 SB |
74 | * before using it for symmetric encryption or HMAC. |
75 | * | |
76 | * Returns 0 if the shared secret was generated successfully, a negative value | |
77 | * if an error occurred. | |
78 | */ | |
8f44df15 | 79 | int crypto_ecdh_shared_secret(unsigned int curve_id, unsigned int ndigits, |
3c4b2390 SB |
80 | const u8 *private_key, unsigned int private_key_len, |
81 | const u8 *public_key, unsigned int public_key_len, | |
82 | u8 *secret, unsigned int secret_len); | |
83 | #endif |