feat: implemented methods for crypto private key handle to import and export raw keys

Author: WyvernIXTL

src/crypto-layer/CryptoAsymmetricKeyHandle.ts

@@ -23,6 +23,41 @@ export class CryptoAsymmetricKeyHandle extends CryptoSerializableAsync {
 
     public keyPairHandle: KeyPairHandle;
 
+    protected static async newFromProviderAndKeyPairHandle<T extends CryptoAsymmetricKeyHandle>(
+        this: new () => T,
+        provider: Provider,
+        keyPairHandle: KeyPairHandle,
+        other?: {
+            providerName?: string;
+            keyId?: string;
+            keySpec?: KeyPairSpec;
+        }
+    ): Promise<T> {
+        const result = new this();
+
+        if (other?.providerName) {
+            result.providerName = other.providerName;
+        } else {
+            result.providerName = await provider.providerName();
+        }
+
+        if (other?.keyId) {
+            result.id = other.keyId;
+        } else {
+            result.id = await keyPairHandle.id();
+        }
+
+        if (other?.keySpec) {
+            result.spec = other.keySpec;
+        } else {
+            result.spec = await keyPairHandle.spec();
+        }
+
+        result.provider = provider;
+        result.keyPairHandle = keyPairHandle;
+        return result;
+    }
+
     public static async from(value: any): Promise<CryptoAsymmetricKeyHandle> {
         return await this.fromAny(value);
     }

src/crypto-layer/CryptoPrivateKeyHandle.ts

@@ -1,16 +1,61 @@
 import { type } from "@js-soft/ts-serval";
 import { KeyPairHandle, KeyPairSpec } from "@nmshd/rs-crypto-types";
+import { CoreBuffer, Encoding } from "src/CoreBuffer";
 import { CryptoAsymmetricKeyHandle } from "./CryptoAsymmetricKeyHandle";
+import { getProviderOrThrow, ProviderIdentifier } from "./CryptoLayerProviders";
 
 export interface ICryptoPrivateKeyHandle {
     keyPairHandle: KeyPairHandle;
     spec: KeyPairSpec;
+    toSerializedString(): Promise<string>;
+    toPEM(): Promise<string>;
 }
 
 export interface ICryptoPrivateKeyHandleStatic {
     new (): ICryptoPrivateKeyHandle;
-    fromNativeKey(key: any, spec: KeyPairSpec): Promise<ICryptoPrivateKeyHandle>;
+    fromPEM(providerIdent: ProviderIdentifier, pem: string, config: KeyPairSpec): Promise<ICryptoPrivateKeyHandle>;
+    fromString(
+        providerIdent: ProviderIdentifier,
+        value: string,
+        config: KeyPairSpec,
+        encoding: Encoding
+    ): Promise<ICryptoPrivateKeyHandle>;
+    // fromNativeKey(providerIdent: ProviderIdentifier, key: any, config: KeyPairSpec): Promise<ICryptoPrivateKeyHandle>;
 }
 
 @type("CryptoPrivateKeyHandle")
-export class CryptoPrivateKeyHandle extends CryptoAsymmetricKeyHandle implements ICryptoPrivateKeyHandle {}
+export class CryptoPrivateKeyHandle extends CryptoAsymmetricKeyHandle implements ICryptoPrivateKeyHandle {
+    public async toSerializedString(): Promise<string> {
+        const raw = await this.keyPairHandle.extractKey();
+        return CoreBuffer.from(raw).toString(Encoding.Base64_UrlSafe_NoPadding);
+    }
+
+    public async toPEM(): Promise<string> {
+        const raw = await this.keyPairHandle.extractKey();
+        return CoreBuffer.from(raw).toString(Encoding.Pem, "PRIVATE KEY");
+    }
+
+    public static async fromString(
+        providerIdent: ProviderIdentifier,
+        value: string,
+        config: KeyPairSpec,
+        encoding: Encoding
+    ): Promise<CryptoPrivateKeyHandle> {
+        const raw = CoreBuffer.fromString(value, encoding).buffer;
+        const provider = getProviderOrThrow(providerIdent);
+        const keyPairHandle = await provider.importKeyPair(config, new Uint8Array(0), raw);
+        return await CryptoPrivateKeyHandle.newFromProviderAndKeyPairHandle(provider, keyPairHandle, {
+            keySpec: config
+        });
+    }
+
+    public static async fromPEM(
+        providerIdent: ProviderIdentifier,
+        pem: string,
+        config: KeyPairSpec
+    ): Promise<CryptoPrivateKeyHandle> {
+        return await CryptoPrivateKeyHandle.fromString(providerIdent, pem, config, Encoding.Pem);
+    }
+}
+
+const _testAssign: ICryptoPrivateKeyHandleStatic = CryptoPrivateKeyHandle;