rspec/rules/S5542/kotlin/rule.adoc

include::../description.adoc[]

== Noncompliant Code Example

[source,kotlin]
----
val c1 = Cipher.getInstance("AES") // Noncompliant: by default ECB mode is chosen
val c2 = Cipher.getInstance("AES/ECB/NoPadding") // Noncompliant: ECB doesn't provide serious message confidentiality

val c3 = Cipher.getInstance("RSA/None/NoPadding") // Noncompliant: RSA without OAEP padding scheme is not recommanded
----

== Compliant Solution

[source,kotlin]
----
// Recommended for block ciphers
val c1 = Cipher.getInstance("AES/GCM/NoPadding"); // Compliant

// Recommended for RSA
val c3 = Cipher.getInstance("RSA/None/OAEPWITHSHA-256ANDMGF1PADDING") // Compliant
// or the ECB mode can be used for RSA when "None" is not available with the security provider used - in that case, ECB will be treated as "None" for RSA.
val c3 = Cipher.getInstance("RSA/ECB/OAEPWITHSHA-256ANDMGF1PADDING"); // Compliant
----

== See

* https://owasp.org/Top10/A02_2021-Cryptographic_Failures/[OWASP Top 10 2021 Category A2] - Cryptographic Failures
* https://www.owasp.org/index.php/Top_10-2017_A6-Security_Misconfiguration[OWASP Top 10 2017 Category A6] - Security Misconfiguration
* https://mobile-security.gitbook.io/masvs/security-requirements/0x08-v3-cryptography_verification_requirements[Mobile AppSec Verification Standard] - Cryptography Requirements
* https://owasp.org/www-project-mobile-top-10/2016-risks/m5-insufficient-cryptography[OWASP Mobile Top 10 2016 Category M5] - Insufficient Cryptography
* https://cwe.mitre.org/data/definitions/327[MITRE, CWE-327] - Use of a Broken or Risky Cryptographic Algorithm
* https://wiki.sei.cmu.edu/confluence/x/hDdGBQ[CERT, MSC61-J.] - Do not use insecure or weak cryptographic algorithms
* https://www.sans.org/top25-software-errors/#cat3[SANS Top 25] - Porous Defenses

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[]