dcrypt_algorithms/ec/p256/
constants.rs

1//! Shared constants and helper functions for P-256 operations
2
3/// Size of a P-256 scalar in bytes (32 bytes = 256 bits)
4pub const P256_SCALAR_SIZE: usize = 32;
5
6/// Size of a P-256 field element in bytes (32 bytes = 256 bits)
7pub const P256_FIELD_ELEMENT_SIZE: usize = 32;
8
9/// Size of an uncompressed P-256 point in bytes: format byte (0x04) + x-coordinate + y-coordinate
10pub const P256_POINT_UNCOMPRESSED_SIZE: usize = 1 + 2 * P256_FIELD_ELEMENT_SIZE; // 65 bytes: 0x04 || x || y
11
12/// Size of a compressed P-256 point in bytes: format byte (0x02/0x03) + x-coordinate
13pub const P256_POINT_COMPRESSED_SIZE: usize = 1 + P256_FIELD_ELEMENT_SIZE; // 33 bytes: 0x02/0x03 || x
14
15/// Size of the KDF output for P-256 ECDH-KEM shared secret derivation
16pub const P256_KEM_SHARED_SECRET_KDF_OUTPUT_SIZE: usize = 32;