Module stm32wlxx_hal::pka

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Expand description

Public key accelerator

Quickstart:

Alternatives

The p256-cortex-m4 crate offers an assembly implementation of P256 that is about 10x faster then the hardware.

ECDSA key pair generation

Generate a private key for NIST_P256:

$ openssl ecparam -genkey -name prime256v1 -out key.pem
$ openssl ec -in key.pem -noout -text
read EC key
Private-Key: (256 bit)
priv:
    49:ac:87:27:ce:e8:74:84:fe:6d:fd:a5:10:23:8a:
    d4:11:ac:e8:fe:59:3a:8c:b7:04:92:d6:59:db:81:
    80:2a
pub:
    04:fa:65:57:59:de:c3:90:28:96:46:0a:43:2b:ae:
    1d:00:91:26:e1:b4:88:78:9f:f4:ef:6b:9a:9b:de:
    1b:c3:63:8f:a0:2a:c4:c4:21:ca:88:4f:06:51:f4:
    e9:85:e3:cf:d0:af:40:69:cc:87:f3:a8:8a:8e:95:
    e7:55:6c:ed:97
ASN1 OID: prime256v1
NIST CURVE: P-256

The first 04 on the public key is encoding information, expressed in rust that keypair becomes this:

use stm32wlxx_hal::pka::EcdsaPublicKey;

const PRIV_KEY: [u32; 8] = [
    0x49ac8727, 0xcee87484, 0xfe6dfda5, 0x10238ad4, 0x11ace8fe, 0x593a8cb7, 0x0492d659,
    0xdb81802a,
];

const CURVE_PT_X: [u32; 8] = [
    0xfa655759, 0xdec39028, 0x96460a43, 0x2bae1d00, 0x9126e1b4, 0x88789ff4, 0xef6b9a9b,
    0xde1bc363,
];
const CURVE_PT_Y: [u32; 8] = [
    0x8fa02ac4, 0xc421ca88, 0x4f0651f4, 0xe985e3cf, 0xd0af4069, 0xcc87f3a8, 0x8a8e95e7,
    0x556ced97,
];
let pub_key: EcdsaPublicKey<8> = EcdsaPublicKey {
    curve_pt_x: &CURVE_PT_X,
    curve_pt_y: &CURVE_PT_Y,
};

Use this command to find the name of other curves:

openssl ecparam -list_curves

Modules

  • curve
    Pre-defined elliptic curves.

Structs

Enums