#Sign Content

Sign any type of content using cryptographic key pairs based on supported algorithms from the walt.id crypto lib.

#Sign Raw Plaintext

Here is how you can sign raw plaintext with a JWKKey:

import id.walt.crypto.keys.JWKKey
import java.nio.charset.StandardCharsets

suspend fun main() {
    val plaintext = "message to sign".toByteArray(StandardCharsets.UTF_8)
    val signedContent = jwkKey.signRaw(plaintext)
    println("Signed Content: " + signedContent.toString(StandardCharsets.UTF_8))
}

#Sign JWS

You can also sign a plaintext message with additional headers, creating a full JWS (JSON Web Signature). See the below usage:

import id.walt.crypto.keys.JWKKey
import java.nio.charset.StandardCharsets

suspend fun main() {
    val plaintext = "message to sign".toByteArray(StandardCharsets.UTF_8)
    val headers = mapOf("header1" to "value1", "header2" to "value2")
    val signedJws = jwkKey.signJws(plaintext, headers)
    println("Signed JWS: $signedJws")
}

In each case, replace jwkKey with the actual instance of your JWKKey object. Refer to key creation or import to get a jwkKey object.

Note: Signing functions are suspendable, so make sure they're called from a coroutine scope or from another suspend function.

Key Export Overview