include/crypto/internal/ecc.h

Source file repositories/reference/linux-study-clean/include/crypto/internal/ecc.h

File Facts

System
Linux kernel
Corpus path
include/crypto/internal/ecc.h
Extension
.h
Size
9888 bytes
Lines
313
Domain
Repository Root And Misc
Bucket
include
Inferred role
Repository Root And Misc: implementation source
Status
source implementation candidate

Why This File Exists

Top-level or miscellaneous repository surface. Use this as map coverage unless a later manual pass promotes the file into a deeper subsystem dossier.

Dependency Surface

Detected Declarations

Annotated Snippet

struct ecdsa_raw_sig {
	u64 r[ECC_MAX_DIGITS];
	u64 s[ECC_MAX_DIGITS];
};

/**
 * ecc_swap_digits() - Copy ndigits from big endian array to native array
 * @in:       Input array
 * @out:      Output array
 * @ndigits:  Number of digits to copy
 */
static inline void ecc_swap_digits(const void *in, u64 *out, unsigned int ndigits)
{
	const __be64 *src = (__force __be64 *)in;
	int i;

	for (i = 0; i < ndigits; i++)
		out[i] = get_unaligned_be64(&src[ndigits - 1 - i]);
}

/**
 * ecc_digits_from_bytes() - Create ndigits-sized digits array from byte array
 * @in:       Input byte array
 * @nbytes:   Size of input byte array
 * @out:      Output digits array
 * @ndigits:  Number of digits to create from byte array
 *
 * The first byte in the input byte array is expected to hold the most
 * significant bits of the large integer.
 */
void ecc_digits_from_bytes(const u8 *in, unsigned int nbytes,
			   u64 *out, unsigned int ndigits);

/**
 * ecc_is_key_valid() - Validate a given ECDH private key
 *
 * @curve_id:		id representing the curve to use
 * @ndigits:		curve's number of digits
 * @private_key:	private key to be used for the given curve
 * @private_key_len:	private key length
 *
 * Returns: 0 if the key is acceptable, a negative value otherwise
 */
int ecc_is_key_valid(unsigned int curve_id, unsigned int ndigits,
		     const u64 *private_key, unsigned int private_key_len);

/**
 * ecc_gen_privkey() -  Generates an ECC private key.
 * The private key is a random integer in the range 0 < random < n, where n is a
 * prime that is the order of the cyclic subgroup generated by the distinguished
 * point G.
 * @curve_id:		id representing the curve to use
 * @ndigits:		curve number of digits
 * @private_key:	buffer for storing the generated private key
 *
 * Returns: 0 if the private key was generated successfully, a negative value
 * if an error occurred.
 */
int ecc_gen_privkey(unsigned int curve_id, unsigned int ndigits,
		    u64 *private_key);

/**
 * ecc_make_pub_key() - Compute an ECC public key
 *
 * @curve_id:		id representing the curve to use
 * @ndigits:		curve's number of digits
 * @private_key:	pregenerated private key for the given curve
 * @public_key:		buffer for storing the generated public key
 *
 * Returns: 0 if the public key was generated successfully, a negative value
 * if an error occurred.
 */
int ecc_make_pub_key(const unsigned int curve_id, unsigned int ndigits,
		     const u64 *private_key, u64 *public_key);

/**
 * crypto_ecdh_shared_secret() - Compute a shared secret
 *
 * @curve_id:		id representing the curve to use
 * @ndigits:		curve's number of digits
 * @private_key:	private key of part A
 * @public_key:		public key of counterpart B
 * @secret:		buffer for storing the calculated shared secret
 *
 * Note: It is recommended that you hash the result of crypto_ecdh_shared_secret
 * before using it for symmetric encryption or HMAC.
 *
 * Returns: 0 if the shared secret was generated successfully, a negative value
 * if an error occurred.
 */

Annotation

Implementation Notes