rspec/rules/S3329/kotlin/rule.adoc

== Why is this an issue?

include::../description.adoc[]

=== Noncompliant code example

[source,kotlin]
----
val bytesIV = "7cVgr5cbdCZVw5WY".toByteArray(charset("UTF-8")) // Predictable / hardcoded IV

val iv = IvParameterSpec(bytesIV)
val skeySpec = SecretKeySpec(secretKey.toByteArray(), "AES")

val cipher: Cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING")
cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv) // Noncompliant (s3329)

val encryptedBytes: ByteArray = cipher.doFinal("foo".toByteArray())
----

=== Compliant solution

[source,kotlin]
----
val random: SecureRandom = SecureRandom()

val bytesIV: ByteArray = ByteArray(16)
random.nextBytes(bytesIV); // Unpredictable / random IV

val iv = IvParameterSpec(bytesIV)
val skeySpec = SecretKeySpec(secretKey.toByteArray(), "AES")

val cipher: Cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING")
cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv) //Compliant (s3329)

val encryptedBytes: ByteArray = cipher.doFinal("foo".toByteArray())
----

include::../see.adoc[]

ifdef::env-github,rspecator-view[]

'''
== Implementation Specification
(visible only on this page)

include::../message.adoc[]

'''
== Comments And Links
(visible only on this page)

include::../comments-and-links.adoc[]
endif::env-github,rspecator-view[]