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crypto: ecc - Add nbits field to ecc_curve structure

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Add the number of bits a curve has to the ecc_curve definition to be able
to derive the number of bytes a curve requires for its coordinates from it.
It also allows one to identify a curve by its particular size. Set the
number of bits on all curve definitions.

Tested-by: Lukas Wunner <lukas@wunner.de>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Vitaly Chikunov <vt@altlinux.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Stefan Berger 2024-04-04 10:18:48 -04:00 committed by Herbert Xu
parent 48e8d3a5f4
commit c0d6bd1fd3
3 changed files with 11 additions and 0 deletions
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4
crypto/ecc_curve_defs.h
View File

@ -17,6 +17,7 @@ static u64 nist_p192_b[] = { 0xFEB8DEECC146B9B1ull, 0x0FA7E9AB72243049ull,
0x64210519E59C80E7ull };
static struct ecc_curve nist_p192 = {
.name = "nist_192",
.nbits = 192,
.g = {
.x = nist_p192_g_x,
.y = nist_p192_g_y,
@ -43,6 +44,7 @@ static u64 nist_p256_b[] = { 0x3BCE3C3E27D2604Bull, 0x651D06B0CC53B0F6ull,
0xB3EBBD55769886BCull, 0x5AC635D8AA3A93E7ull };
static struct ecc_curve nist_p256 = {
.name = "nist_256",
.nbits = 256,
.g = {
.x = nist_p256_g_x,
.y = nist_p256_g_y,
@ -75,6 +77,7 @@ static u64 nist_p384_b[] = { 0x2a85c8edd3ec2aefull, 0xc656398d8a2ed19dull,
0x988e056be3f82d19ull, 0xb3312fa7e23ee7e4ull };
static struct ecc_curve nist_p384 = {
.name = "nist_384",
.nbits = 384,
.g = {
.x = nist_p384_g_x,
.y = nist_p384_g_y,
@ -95,6 +98,7 @@ static u64 curve25519_a[] = { 0x000000000001DB41, 0x0000000000000000,
0x0000000000000000, 0x0000000000000000 };
static const struct ecc_curve ecc_25519 = {
.name = "curve25519",
.nbits = 255,
.g = {
.x = curve25519_g_x,
.ndigits = 4,

5
crypto/ecrdsa_defs.h
View File

@ -47,6 +47,7 @@ static u64 cp256a_b[] = {
static struct ecc_curve gost_cp256a = {
.name = "cp256a",
.nbits = 256,
.g = {
.x = cp256a_g_x,
.y = cp256a_g_y,
@ -80,6 +81,7 @@ static u64 cp256b_b[] = {
static struct ecc_curve gost_cp256b = {
.name = "cp256b",
.nbits = 256,
.g = {
.x = cp256b_g_x,
.y = cp256b_g_y,
@ -117,6 +119,7 @@ static u64 cp256c_b[] = {
static struct ecc_curve gost_cp256c = {
.name = "cp256c",
.nbits = 256,
.g = {
.x = cp256c_g_x,
.y = cp256c_g_y,
@ -166,6 +169,7 @@ static u64 tc512a_b[] = {
static struct ecc_curve gost_tc512a = {
.name = "tc512a",
.nbits = 512,
.g = {
.x = tc512a_g_x,
.y = tc512a_g_y,
@ -211,6 +215,7 @@ static u64 tc512b_b[] = {
static struct ecc_curve gost_tc512b = {
.name = "tc512b",
.nbits = 512,
.g = {
.x = tc512b_g_x,
.y = tc512b_g_y,

2
include/crypto/ecc_curve.h
View File

@ -23,6 +23,7 @@ struct ecc_point {
* struct ecc_curve - definition of elliptic curve
*
* @name: Short name of the curve.
* @nbits: The number of bits of a curve.
* @g: Generator point of the curve.
* @p: Prime number, if Barrett's reduction is used for this curve
* pre-calculated value 'mu' is appended to the @p after ndigits.
@ -34,6 +35,7 @@ struct ecc_point {
*/
struct ecc_curve {
char *name;
u32 nbits;
struct ecc_point g;
u64 *p;
u64 *n;