Support HKDF in Apple provider

Author: whyoleg

cryptography-providers-tests/src/commonMain/kotlin/SupportedAlgorithmsTest.kt

@@ -53,6 +53,6 @@ abstract class SupportedAlgorithmsTest(provider: CryptographyProvider) : Provide
         assertSupports(RSA.RAW, !context.provider.isWebCrypto)
 
         assertSupports(PBKDF2)
-        assertSupports(HKDF, context.provider.isWebCrypto || context.provider.isOpenssl3)
+        assertSupports(HKDF)
     }
 }

cryptography-providers/apple/src/commonMain/kotlin/AppleCryptographyProvider.kt

@@ -33,6 +33,7 @@ internal object AppleCryptographyProvider : CryptographyProvider() {
         RSA.RAW -> SecRsaRaw
         ECDSA   -> SecEcdsa
         PBKDF2  -> CCPbkdf2
+        HKDF    -> CCHkdf
         else      -> null
     } as A?
 }

cryptography-providers/apple/src/commonMain/kotlin/algorithms/CCHkdf.kt

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2024 Oleg Yukhnevich. Use of this source code is governed by the Apache 2.0 license.
+ */
+
+package dev.whyoleg.cryptography.providers.apple.algorithms
+
+import dev.whyoleg.cryptography.*
+import dev.whyoleg.cryptography.algorithms.*
+import dev.whyoleg.cryptography.providers.apple.*
+import dev.whyoleg.cryptography.providers.base.algorithms.*
+import platform.CoreCrypto.*
+
+internal object CCHkdf : BaseHkdf(AppleCryptographyProvider) {
+    override fun digestSize(digest: CryptographyAlgorithmId<Digest>): Int {
+        return when (digest) {
+            SHA1   -> CC_SHA1_DIGEST_LENGTH
+            SHA224 -> CC_SHA224_DIGEST_LENGTH
+            SHA256 -> CC_SHA256_DIGEST_LENGTH
+            SHA384 -> CC_SHA384_DIGEST_LENGTH
+            SHA512 -> CC_SHA512_DIGEST_LENGTH
+            else   -> throw IllegalStateException("Unsupported hash algorithm: $digest")
+        }
+    }
+}