Add Android implementation of crypto shim

a-sit-plus · Sep 27, 2024 · 9bccbbf · 9bccbbf
1 parent 5571496
commit 9bccbbf
Showing 1 changed file with 11 additions and 0 deletions.
diff --git a/vck/src/androidMain/kotlin/at/asitplus/wallet/lib/agent/CryptoService.android.kt b/vck/src/androidMain/kotlin/at/asitplus/wallet/lib/agent/CryptoService.android.kt
@@ -4,6 +4,7 @@ import at.asitplus.KmmResult
 import at.asitplus.KmmResult.Companion.wrap
 import at.asitplus.signum.indispensable.josef.*
 import javax.crypto.Cipher
+import javax.crypto.Mac
 import javax.crypto.spec.GCMParameterSpec
 import javax.crypto.spec.SecretKeySpec
 
@@ -78,5 +79,15 @@ actual open class PlatformCryptoShim actual constructor(actual val keyMaterial:
         return KmmResult.success("sharedSecret-${algorithm.identifier}".encodeToByteArray())
     }
 
+    actual fun hmac(
+        key: ByteArray,
+        algorithm: JweEncryption,
+        input: ByteArray,
+    ): KmmResult<ByteArray> = runCatching {
+        Mac.getInstance(algorithm.jcaHmacName).also {
+            it.init(SecretKeySpec(key, algorithm.jcaKeySpecName))
+        }.doFinal(input)
+    }.wrap()
+
 }