96811524d7
* Modify JVM Crypto rules: Change title * changed names * Apply suggestions from code review * fixed includes
87 lines
2.4 KiB
Plaintext
87 lines
2.4 KiB
Plaintext
== How to fix it in Java Cryptography Extension
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=== Code examples
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==== Noncompliant code example
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[source,kotlin,diff-id=1,diff-type=noncompliant]
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----
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import java.nio.charset.StandardCharsets
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import java.security.InvalidAlgorithmParameterException
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import java.security.InvalidKeyException
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import java.security.NoSuchAlgorithmException
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import javax.crypto.Cipher
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import javax.crypto.NoSuchPaddingException
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import javax.crypto.spec.GCMParameterSpec
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import javax.crypto.spec.SecretKeySpec
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fun encrypt(key: String, plainText: String) {
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val randomBytes = "7cVgr5cbdCZVw5WY".toByteArray(StandardCharsets.UTF_8)
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val iv = GCMParameterSpec(128, randomBytes)
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val keySpec = SecretKeySpec(key.toByteArray(StandardCharsets.UTF_8), "AES")
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try {
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val cipher = Cipher.getInstance("AES/CBC/NoPadding")
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cipher.init(Cipher.ENCRYPT_MODE, keySpec, iv) // Noncompliant
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} catch (e: NoSuchAlgorithmException) {
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// ...
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} catch (e: InvalidKeyException) {
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// ...
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} catch (e: NoSuchPaddingException) {
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// ...
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} catch (e: InvalidAlgorithmParameterException) {
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// ...
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}
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}
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----
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==== Compliant solution
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:explicit_strong: java.security.SecureRandom
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include::../../common/fix/explicit-fix.adoc[]
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[source,kotlin,diff-id=1,diff-type=compliant]
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----
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import java.nio.charset.StandardCharsets
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import java.security.SecureRandom
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import java.security.InvalidAlgorithmParameterException
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import java.security.InvalidKeyException
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import java.security.NoSuchAlgorithmException
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import javax.crypto.Cipher
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import javax.crypto.NoSuchPaddingException
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import javax.crypto.spec.GCMParameterSpec
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import javax.crypto.spec.SecretKeySpec
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fun encrypt(key: String, plainText: String) {
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val random = SecureRandom();
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val randomBytes = ByteArray(16);
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random.nextBytes(randomBytes);
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val iv = GCMParameterSpec(128, randomBytes)
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val keySpec = SecretKeySpec(key.toByteArray(StandardCharsets.UTF_8), "AES")
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try {
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val cipher = Cipher.getInstance("AES/CBC/NoPadding")
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cipher.init(Cipher.ENCRYPT_MODE, keySpec, iv)
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} catch (e: NoSuchAlgorithmException) {
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// ...
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} catch (e: InvalidKeyException) {
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// ...
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} catch (e: NoSuchPaddingException) {
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// ...
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} catch (e: InvalidAlgorithmParameterException) {
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// ...
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}
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}
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----
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=== How does this work?
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include::../../common/fix/fix.adoc[]
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