Android MD5 Test Suite / Unit Test / Test Vectors

April 8, 2019

fun String.toMD5(): String {
    // toByteArray: default is Charsets.UTF_8 - https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.text/to-byte-array.html
    val bytes = MessageDigest.getInstance("MD5").digest(this.toByteArray())
    return bytes.toHex()
}

fun ByteArray.toHex(): String {
    return joinToString("") { "%02x".format(it) }
}

@RunWith(AndroidJUnit4::class)
class MD5Test {
    @Test
    fun test() {
        // echo -n a | md5sum
        // https://tools.ietf.org/html/rfc1321
        val testSets = mapOf(
            "" to "d41d8cd98f00b204e9800998ecf8427e",
            "a" to "0cc175b9c0f1b6a831c399e269772661",
            "abc" to "900150983cd24fb0d6963f7d28e17f72",
            "message digest" to "f96b697d7cb7938d525a2f31aaf161d0",
            "abcdefghijklmnopqrstuvwxyz" to "c3fcd3d76192e4007dfb496cca67e13b",
            "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" to "d174ab98d277d9f5a5611c2c9f419d9f",
            "12345678901234567890123456789012345678901234567890123456789012345678901234567890" to "57edf4a22be3c955ac49da2e2107b67a",
            "你好吗？" to "bb0b6bc45375143826f72439e050743e",
            "お元気ですか" to "2e0bd9e58d042f5234a1202cc3c7d499"
        )

        for ((key, value) in testSets) {
            assertThat(key.toMD5(), `is`(value))
        }
    }
}