Module p256::ecdsa

This is supported on crate feature ecdsa-core only.

Elliptic Curve Digital Signature Algorithm (ECDSA)

This module contains support for computing and verifying ECDSA signatures. To use it, you will need to enable one of the two following Cargo features:

• ecdsa-core: provides only the Signature type (which represents an ECDSA/P-256 signature). Does not require the arithmetic feature. This is useful for 3rd-party crates which wish to use the Signature type for interoperability purposes (particularly in conjunction with the signature::Signer trait. Example use cases for this include other software implementations of ECDSA/P-256 and wrappers for cloud KMS services or hardware devices (HSM or crypto hardware wallet).
• ecdsa: provides ecdsa-core features plus the SigningKey and VerifyingKey types which natively implement ECDSA/P-256 signing and verification.

Signing/Verification Example

This example requires the ecdsa Cargo feature is enabled:

use p256::{
    ecdsa::{SigningKey, Signature, signature::Signer},
};
use rand_core::OsRng; // requires 'getrandom' feature

// Signing
let signing_key = SigningKey::random(&mut OsRng); // Serialize with `::to_bytes()`
let message = b"ECDSA proves knowledge of a secret number in the context of a single message";
let signature = signing_key.sign(message);

// Verification
use p256::ecdsa::{VerifyingKey, signature::Verifier};

let verify_key = VerifyingKey::from(&signing_key); // Serialize with `::to_encoded_point()`
assert!(verify_key.verify(message, &signature).is_ok());

Re-exports

pub use ecdsa_core::signature;

Structs

Error

Signature errors.

Type Definitions

DerSignature	ECDSA/P-256 signature (ASN.1 DER encoded)
Signature	ECDSA/P-256 signature (fixed-size)
SigningKey	ecdsa ECDSA/P-256 signing key
VerifyingKey	ecdsa ECDSA/P-256 verification key (i.e. public key)