ECPublicKey

@available(macOS 10.13, iOS 11, watchOS 4.0, tvOS 11.0, *)
public class ECPublicKey

Represents an elliptic curve public key. Supported curves are:

prime256v1
secp384r1
NID_secp521r1
You can generate an elliptic curve Key using OpenSSL:
https://wiki.openssl.org/index.php/Command_Line_Elliptic_Curve_Operations#Generating_EC_Keys_and_Parameters

Usage Example:

let pemKey = """
-----BEGIN PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEikc5m6C2xtDWeeAeT18WElO37zvF
Oz8p4kAlhvgIHN23XIClNESgKVmLgSSq2asqiwdrU5YHbcHFkgdABM1SPA==
-----END PUBLIC KEY-----
"""
let publicKey = try ECPublicKey(key: pemKey)

let base64Sig = "MEYCIQCvgBLn+tQoBDBR3D2G3485GloYGNxuk6PqR4qjr5GDqAIhAKNvsqvesVBD/MLub/KAyzLLNGtUZyQDxYZj/4vmHwWF"
let signature = try ECSignature(asn1: Data(base64Encoded: base64Sig)) 

let verified = signature.verify(plaintext: "Hello world", using: publicKey)

curveId
A String description of the curve this key was generated from.
Declaration
Swift

public let curveId: String
curve
The EllipticCurve this key was generated from.
Declaration
Swift

public let curve: EllipticCurve
pemString
The public key represented as a PEM String.
Declaration
Swift

public let pemString: String


                    
                    
                    init(key:)

Initialize an ECPublicKey from a .pem file format.

Usage Example:

let publicKeyString = """
-----BEGIN PUBLIC KEY-----
MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEikc5m6C2xtDWeeAeT18WElO37zvF
Oz8p4kAlhvgIHN23XIClNESgKVmLgSSq2asqiwdrU5YHbcHFkgdABM1SPA==
-----END PUBLIC KEY-----
"""
let pemKey = try ECPublicKey(key: publicKeyString)

Throws

An ECError if the PEM string can’t be decoded or is not a valid key.

Declaration

Swift

public convenience init(key: String) throws

Parameters

key

The elliptic curve public key as a PEM string.

Return Value

An ECPublicKey.


                    
                    
                    init(der:)

Initialize an ECPublicKey from .der file data.
This is equivalent to a PEM String that has had the “—–BEGIN PUBLIC KEY—–” header and footer stripped and been base64 encoded to ASN1 Data.