Security is important for any web application. Hashing is one way to help make your application more secure. In this article, we'll take a look at Kotlin and Bcrypt hashing.
Bcrypt is a hashing algorithm that is designed to be difficult to crack. It is a good choice for storing passwords because it is slow, which makes it more difficult for an attacker to use brute force to crack the hash.
Kotlin is a programming language that is designed to be safe and easy to use. It is a good choice for web development because it runs on the JVM and can be used with existing Java libraries.
Bcrypt is a hashing algorithm that is designed to be difficult to crack. It is a good choice for storing passwords because it is slow, which makes it more difficult for an attacker to use brute force to crack the hash.
Bcrypt uses a salt to make the hash more difficult to crack. A salt is a random string of characters that is used to make the hash more unique.
The bcrypt algorithm is:
bcrypt(passwd, salt) = hash(passwd, salt)
where:
passwd
is the password to hashsalt
is the salthash
is the bcrypt hash functionKotlin is a good choice for web development because it runs on the JVM and can be used with existing Java libraries.
To use bcrypt in Kotlin, we'll need to include the bcrypt
library. We can do this using the compile
directive in our build.gradle
file:
compile 'com.mindrot:jbcrypt:0.4'
Now that we have the library, we can create a function to hash a password:
fun hashPassword(password: String): String {
val salt = BCrypt.gensalt()
return BCrypt.hashpw(password, salt)
}
We can use this function to hash a password when a user signs up for our web application. We can then store the hash in our database.
When a user tries to log in, we can use the checkpw
function to check if the password they entered is the same as the hash we have stored:
fun checkPassword(password: String, hash: String): Boolean {
return BCrypt.checkpw(password, hash)
}
Kotlin is a programming language that is designed to be safe and easy to use. It is a good choice for web development because it runs on the JVM and can be used with existing Java libraries.
Kotlin is statically typed, which means that the type of a variable is known at compile time. This can help to prevent errors in your code.
Kotlin is also null safe. This means that you cannot assign a null value to a variable unless you explicitly allow it. This can help to prevent null pointer exceptions in your code.
Kotlin is a good choice for web development because it runs on the JVM and can be used with existing Java libraries.
To use Kotlin for web development, we'll need to include the kotlin-stdlib
library. We can do this using the compile
directive in our build.gradle
file:
compile 'org.jetbrains.kotlin:kotlin-stdlib:1.1.2'
Now that we have the library, we can create a Kotlin file for our web application. We'll start by creating a main
function:
fun main(args: Array<String>) {
println("Hello, world!")
}
We can run our web application using the gradlew
command:
./gradlew run
In this article, we've looked at Kotlin and Bcrypt hashing. We've seen how to use Bcrypt to hash passwords and how to use Kotlin for web development.