paysec-crypto

Core cryptographic provider traits used by the paysec payment-security libraries.

This crate defines cryptographic interfaces and common AES types, but does not provide a cryptographic implementation itself. Concrete providers are supplied by crates such as paysec-crypto-rustcrypto and paysec-crypto-soft-aes.

Features

The crate currently provides provider traits for:

AES block encryption and decryption
AES-CBC encryption and decryption
AES-CMAC
AES-CMAC-based key derivation
AES-128, AES-192, and AES-256 key-size modeling

Provider traits are generic over the key type. This allows software providers to operate on raw key material while leaving room for providers backed by opaque key handles, such as Hardware Security Modules.

Installation

[dependencies]
paysec-crypto = "0.2.0"

Example

use paysec_crypto::{AesBlockCipher, AesKeySize};

fn key_length(key_size: AesKeySize) -> usize {
    key_size.bytes()
}

assert_eq!(key_length(AesKeySize::Bits128), 16);
assert_eq!(key_length(AesKeySize::Bits256), 32);

Implementations

Software implementations are available separately:

paysec-crypto-rustcrypto
paysec-crypto-soft-aes

Security

This crate defines cryptographic interfaces only. Security properties depend on the concrete provider and on how keys are stored and managed.