clk: qcom: msm8916: Fix bimc gpu clock ops
[linux/fpc-iii.git] / crypto / ecc.h
blobe4fd4492c765f0d2031b6a276c6b85d74edd9375
1 /*
2 * Copyright (c) 2013, Kenneth MacKay
3 * All rights reserved.
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.
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.
26 #ifndef _CRYPTO_ECC_H
27 #define _CRYPTO_ECC_H
29 #define ECC_MAX_DIGITS 4 /* 256 */
31 #define ECC_DIGITS_TO_BYTES_SHIFT 3
33 /**
34 * ecc_is_key_valid() - Validate a given ECDH private key
36 * @curve_id: id representing the curve to use
37 * @ndigits: curve's number of digits
38 * @private_key: private key to be used for the given curve
39 * @private_key_len: private key length
41 * Returns 0 if the key is acceptable, a negative value otherwise
43 int ecc_is_key_valid(unsigned int curve_id, unsigned int ndigits,
44 const u64 *private_key, unsigned int private_key_len);
46 /**
47 * ecc_gen_privkey() - Generates an ECC private key.
48 * The private key is a random integer in the range 0 < random < n, where n is a
49 * prime that is the order of the cyclic subgroup generated by the distinguished
50 * point G.
51 * @curve_id: id representing the curve to use
52 * @ndigits: curve number of digits
53 * @private_key: buffer for storing the generated private key
55 * Returns 0 if the private key was generated successfully, a negative value
56 * if an error occurred.
58 int ecc_gen_privkey(unsigned int curve_id, unsigned int ndigits, u64 *privkey);
60 /**
61 * ecc_make_pub_key() - Compute an ECC public key
63 * @curve_id: id representing the curve to use
64 * @ndigits: curve's number of digits
65 * @private_key: pregenerated private key for the given curve
66 * @public_key: buffer for storing the generated public key
68 * Returns 0 if the public key was generated successfully, a negative value
69 * if an error occurred.
71 int ecc_make_pub_key(const unsigned int curve_id, unsigned int ndigits,
72 const u64 *private_key, u64 *public_key);
74 /**
75 * crypto_ecdh_shared_secret() - Compute a shared secret
77 * @curve_id: id representing the curve to use
78 * @ndigits: curve's number of digits
79 * @private_key: private key of part A
80 * @public_key: public key of counterpart B
81 * @secret: buffer for storing the calculated shared secret
83 * Note: It is recommended that you hash the result of crypto_ecdh_shared_secret
84 * before using it for symmetric encryption or HMAC.
86 * Returns 0 if the shared secret was generated successfully, a negative value
87 * if an error occurred.
89 int crypto_ecdh_shared_secret(unsigned int curve_id, unsigned int ndigits,
90 const u64 *private_key, const u64 *public_key,
91 u64 *secret);
92 #endif