Fix output size for JDK

Author: whyoleg

cryptography-providers-tests/src/commonMain/kotlin/default/AesGcmTest.kt

@@ -61,7 +61,7 @@ abstract class AesGcmTest(provider: CryptographyProvider) : AesBasedTest<AES.GCM
         val key = algorithm.keyGenerator(keySize).generateKey()
         listOf(96, 104, 112, 120, 128).forEach { tagSizeBits ->
             val cipher = key.cipher(tagSizeBits.bits)
-            repeat(10) {
+            repeat(100) {
                 val size = CryptographyRandom.nextInt(20000)
                 val data = ByteString(CryptographyRandom.nextBytes(size))
                 assertCipherViaFunction(cipher, cipher, data)
@@ -76,7 +76,7 @@ abstract class AesGcmTest(provider: CryptographyProvider) : AesBasedTest<AES.GCM
         val key = algorithm.keyGenerator(keySize).generateKey()
         listOf(96, 104, 112, 120, 128).forEach { tagSizeBits ->
             val cipher = key.cipher(tagSizeBits.bits)
-            repeat(10) {
+            repeat(100) {
                 val size = CryptographyRandom.nextInt(20000)
                 val data = ByteString(CryptographyRandom.nextBytes(size))
                 assertCipherWithIvViaFunction(cipher, cipher, ivSize, data)

cryptography-providers/base/src/commonMain/kotlin/operations/BaseCipherFunction.kt

@@ -125,7 +125,7 @@ public abstract class BaseCipherFunction : CipherFunction, AutoCloseable {
         }
 
         // can't estimate size to fit for safe output size
-        if (inputSize == -1 || outputSize == -1) {
+        if (inputSize == -1 || outputSize == -1 || outputSize == 0) {
             outputBuffer.write(transformToByteArray(input, inputStartIndex, inputStartIndex + maxInputSize))
             maxInputSize
         } else {

cryptography-providers/jdk/src/jvmMain/kotlin/operations/JdkCipherFunction.kt

@@ -24,11 +24,12 @@ internal open class JdkCipherFunction(
 
         val cipher = cipher.access()
 
+        // java Cipher can return `null` when it produces nothing
         return cipher.update(
             /* input = */ source,
             /* inputOffset = */ startIndex,
             /* inputLen = */ endIndex - startIndex
-        )
+        ) ?: EmptyByteArray
     }
 
     override fun transformIntoByteArray(