ecies 0.2.11

Elliptic Curve Integrated Encryption Scheme for secp256k1
Documentation 
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/// Compressed public key size
#[cfg(all(not(feature = "x25519"), not(feature = "ed25519")))]
pub const COMPRESSED_PUBLIC_KEY_SIZE: usize = 33;

/// Uncompressed public key size
#[cfg(all(not(feature = "x25519"), not(feature = "ed25519")))]
pub const UNCOMPRESSED_PUBLIC_KEY_SIZE: usize = 65;

#[cfg(any(feature = "x25519", feature = "ed25519"))]
pub const PUBLIC_KEY_SIZE: usize = 32;

/// Nonce length. AES (12/16 bytes) or XChaCha20 (24 bytes)
#[cfg(all(not(feature = "aes-short-nonce"), not(feature = "xchacha20")))]
pub const NONCE_LENGTH: usize = 16;
#[cfg(all(feature = "aes-short-nonce", not(feature = "xchacha20")))]
pub const NONCE_LENGTH: usize = 12;
#[cfg(feature = "xchacha20")]
pub const NONCE_LENGTH: usize = 24;

/// AEAD tag length
pub const AEAD_TAG_LENGTH: usize = 16;

/// Nonce + tag length
pub const NONCE_TAG_LENGTH: usize = NONCE_LENGTH + AEAD_TAG_LENGTH;

/// Empty bytes array
pub const EMPTY_BYTES: [u8; 0] = [];

/// Shared secret derived from key exchange by hkdf
pub type SharedSecret = [u8; 32];

pub(crate) const ZERO_SECRET: [u8; 32] = [0u8; 32];