Fixed some of the errors spotted in various aes implementation while doing cryptopals challenge, anyways they were unused. Added multipart generic hash (blake2b) native implementation

multiplatform-crypto/src/commonMain/kotlin/com/ionspin/kotlin/crypto/symmetric/AesCbcPure.kt

@@ -145,7 +145,8 @@ internal class AesCbcPure internal constructor(val aesKey: InternalAesKey, val m
     }
 
     /**
-     * Encrypt fed data and return it alongside the randomly chosen initialization vector
+     * Encrypt fed data and return it alongside the randomly chosen initialization vector.
+     * This also applies correct PKCS#7 padding
      * @return Encrypted data and initialization vector
      */
     fun encrypt(): EncryptedDataAndInitializationVector {
@@ -158,6 +159,8 @@ internal class AesCbcPure internal constructor(val aesKey: InternalAesKey, val m
             } else {
                 output += consumeBlock(lastBlockPadded)
             }
+        } else {
+            output += consumeBlock(UByteArray(BLOCK_BYTES) { BLOCK_BYTES.toUByte()})
         }
         return EncryptedDataAndInitializationVector(
             output.reversed().foldRight(UByteArray(0) { 0U }) { arrayOfUBytes, acc -> acc + arrayOfUBytes },
@@ -172,11 +175,10 @@ internal class AesCbcPure internal constructor(val aesKey: InternalAesKey, val m
     fun decrypt(): UByteArray {
         val removePaddingCount = output.last().last()
 
-
         val removedPadding = if (removePaddingCount > 0U && removePaddingCount < 16U) {
             output.last().dropLast(removePaddingCount.toInt() and 0x7F)
         } else {
-            output.last().toList()
+            ubyteArrayOf()
         }.toUByteArray()
         val preparedOutput = (output.dropLast(1) + listOf(removedPadding))
         //JS compiler freaks out here if we don't supply exact type
@@ -238,4 +240,4 @@ data class EncryptedDataAndInitializationVector(val encryptedData : UByteArray,
         result = 31 * result + initializationVector.contentHashCode()
         return result
     }
-}
+}

multiplatform-crypto/src/commonMain/kotlin/com/ionspin/kotlin/crypto/symmetric/AesCtrPure.kt

@@ -54,8 +54,8 @@ internal class AesCtrPure internal constructor(val aesKey: InternalAesKey, val m
          * Creates and returns AesCtr instance that can be fed data using [addData]. Once you have submitted all
          * data call [decrypt]
          */
-        fun createDecryptor(aesKey : InternalAesKey) : AesCtrPure {
-            return AesCtrPure(aesKey, Mode.DECRYPT)
+        fun createDecryptor(aesKey : InternalAesKey, initialCounter: UByteArray) : AesCtrPure {
+            return AesCtrPure(aesKey, Mode.DECRYPT, initialCounter = initialCounter)
         }
         /**
          * Bulk encryption, returns encrypted data and a random initial counter
@@ -68,8 +68,8 @@ internal class AesCtrPure internal constructor(val aesKey: InternalAesKey, val m
         /**
          * Bulk decryption, returns decrypted data
          */
-        fun decrypt(aesKey: InternalAesKey, data: UByteArray, initialCounter: UByteArray? = null): UByteArray {
-            val aesCtr = AesCtrPure(aesKey, Mode.DECRYPT, initialCounter)
+        fun decrypt(aesKey: InternalAesKey, data: UByteArray, initialCounter: UByteArray): UByteArray {
+            val aesCtr = AesCtrPure(aesKey, Mode.DECRYPT, initialCounter = initialCounter)
             aesCtr.addData(data)
             return aesCtr.decrypt()
         }

multiplatform-crypto/src/commonTest/kotlin/com/ionspin/kotlin/crypto/symmetric/AesCbcTest.kt

@@ -35,7 +35,9 @@ class AesCbcTest {
             val key = "4278b840fb44aaa757c1bf04acbe1a3e"
             val iv = "57f02a5c5339daeb0a2908a06ac6393f"
             val plaintext = "3c888bbbb1a8eb9f3e9b87acaad986c466e2f7071c83083b8a557971918850e5"
-            val expectedCipherText = "479c89ec14bc98994e62b2c705b5014e175bd7832e7e60a1e92aac568a861eb7"
+            val expectedCipherText = "479c89ec14bc98994e62b2c705b5014e" +
+                    "175bd7832e7e60a1e92aac568a861eb7" +
+                    "fc2dc2f4a527ce39f79c56b31432c779"
             val aesCbc =
                 AesCbcPure(InternalAesKey.Aes128Key(key), mode = Mode.ENCRYPT, initializationVector = iv.hexStringToUByteArray())
             aesCbc.addData(plaintext.hexStringToUByteArray())
@@ -104,4 +106,4 @@ class AesCbcTest {
 
 
 
-}
+}