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2 * Copyright (c) 2013, Kenneth MacKay
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6 * modification, are permitted provided that the following conditions are
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9 * notice, this list of conditions and the following disclaimer.
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11 * notice, this list of conditions and the following disclaimer in the
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29 #define ECC_CURVE_NIST_P192_DIGITS 3
30 #define ECC_CURVE_NIST_P256_DIGITS 4
31 #define ECC_MAX_DIGITS ECC_CURVE_NIST_P256_DIGITS
33 #define ECC_DIGITS_TO_BYTES_SHIFT 3
36 * ecc_is_key_valid() - Validate a given ECDH private key
38 * @curve_id: id representing the curve to use
39 * @ndigits: curve's number of digits
40 * @private_key: private key to be used for the given curve
41 * @private_key_len: private key length
43 * Returns 0 if the key is acceptable, a negative value otherwise
45 int ecc_is_key_valid(unsigned int curve_id
, unsigned int ndigits
,
46 const u64
*private_key
, unsigned int private_key_len
);
49 * ecc_gen_privkey() - Generates an ECC private key.
50 * The private key is a random integer in the range 0 < random < n, where n is a
51 * prime that is the order of the cyclic subgroup generated by the distinguished
53 * @curve_id: id representing the curve to use
54 * @ndigits: curve number of digits
55 * @private_key: buffer for storing the generated private key
57 * Returns 0 if the private key was generated successfully, a negative value
58 * if an error occurred.
60 int ecc_gen_privkey(unsigned int curve_id
, unsigned int ndigits
, u64
*privkey
);
63 * ecc_make_pub_key() - Compute an ECC public key
65 * @curve_id: id representing the curve to use
66 * @ndigits: curve's number of digits
67 * @private_key: pregenerated private key for the given curve
68 * @public_key: buffer for storing the generated public key
70 * Returns 0 if the public key was generated successfully, a negative value
71 * if an error occurred.
73 int ecc_make_pub_key(const unsigned int curve_id
, unsigned int ndigits
,
74 const u64
*private_key
, u64
*public_key
);
77 * crypto_ecdh_shared_secret() - Compute a shared secret
79 * @curve_id: id representing the curve to use
80 * @ndigits: curve's number of digits
81 * @private_key: private key of part A
82 * @public_key: public key of counterpart B
83 * @secret: buffer for storing the calculated shared secret
85 * Note: It is recommended that you hash the result of crypto_ecdh_shared_secret
86 * before using it for symmetric encryption or HMAC.
88 * Returns 0 if the shared secret was generated successfully, a negative value
89 * if an error occurred.
91 int crypto_ecdh_shared_secret(unsigned int curve_id
, unsigned int ndigits
,
92 const u64
*private_key
, const u64
*public_key
,