Add EcKeyImportParams to SubtleCrypto.importKey (#769)

Co-authored-by: Guy Bedford <[email protected]>

Author: jsocol

types/globals.d.ts

@@ -1705,7 +1705,7 @@ declare class SubtleCrypto {
   // generateKey(algorithm: AesKeyGenParams | HmacKeyGenParams | Pbkdf2Params, extractable: boolean, keyUsages: ReadonlyArray<KeyUsage>): Promise<CryptoKey>;
   // generateKey(algorithm: AlgorithmIdentifier, extractable: boolean, keyUsages: KeyUsage[]): Promise<CryptoKeyPair | CryptoKey>;
   // importKey(format: "jwk", keyData: JsonWebKey, algorithm: AlgorithmIdentifier | RsaHashedImportParams | EcKeyImportParams | HmacImportParams | AesKeyAlgorithm, extractable: boolean, keyUsages: ReadonlyArray<KeyUsage>): Promise<CryptoKey>;
-  importKey(format: "jwk", keyData: JsonWebKey, algorithm: AlgorithmIdentifier | RsaHashedImportParams, extractable: boolean, keyUsages: ReadonlyArray<KeyUsage>): Promise<CryptoKey>;
+  importKey(format: "jwk", keyData: JsonWebKey, algorithm: AlgorithmIdentifier | RsaHashedImportParams | EcKeyImportParams, extractable: boolean, keyUsages: ReadonlyArray<KeyUsage>): Promise<CryptoKey>;
   importKey(
     format: Exclude<KeyFormat, "jwk">,
     keyData: BufferSource,
@@ -1734,6 +1734,11 @@ interface RsaHashedImportParams extends Algorithm {
 }
 type HashAlgorithmIdentifier = AlgorithmIdentifier;
 
+interface EcKeyImportParams {
+  name: "ECDSA";
+  namedCurve: "P-256" | "P-384" | "P-521";
+}
+
 interface JsonWebKey {
   alg?: string;
   crv?: string;