Added java implementation of _pwhash_

multiplatform-crypto-libsodium-bindings/src/commonTest/kotlin/com/ionspin/kotlin/crypto/pwhash/PasswordHashTest.kt

@@ -1,5 +1,6 @@
 package com.ionspin.kotlin.crypto.pwhash
 
+import com.ionspin.kotlin.crypto.LibsodiumInitializer
 import com.ionspin.kotlin.crypto.util.toHexString
 import kotlin.random.Random
 import kotlin.random.nextUBytes
@@ -14,44 +15,53 @@ import kotlin.test.assertTrue
 class PasswordHashTest {
     @Test
     fun testPasswordHash() {
-        val randomBytes = Random(0).nextUBytes(crypto_pwhash_SALTBYTES)
-        val password = "correct horse battery staple"
-        val hashedPassword = PasswordHash.pwhash(
-            64,
-            password,
-            randomBytes,
-            crypto_pwhash_OPSLIMIT_MIN,
-            crypto_pwhash_MEMLIMIT_MIN,
-            crypto_pwhash_ALG_DEFAULT
-        )
-        println("Hashed password: ${hashedPassword.toHexString()}")
+        LibsodiumInitializer.initializeWithCallback {
+            val randomBytes = Random(0).nextUBytes(crypto_pwhash_SALTBYTES)
+            val password = "correct horse battery staple"
+            val hashedPassword = PasswordHash.pwhash(
+                64,
+                password,
+                randomBytes,
+                crypto_pwhash_OPSLIMIT_MIN,
+                crypto_pwhash_MEMLIMIT_MIN,
+                crypto_pwhash_ALG_DEFAULT
+            )
+            println("Hashed password: ${hashedPassword.toHexString()}")
+            assertTrue {
+                hashedPassword.toHexString().equals("e762ee529e90e3bbc242c23e8e2f963ab9a17ed9e79f89a00c71261a979207b2213cc" +
+                        "0330c53f410a9c8933c46e8642dc542efc0660c69e255b601c7244ef6b0")
+            }
+        }
     }
 
     @Test
     fun testPasswordHashForStorage() {
-        val password = "correct horse battery staple"
-        val hashedPassword = PasswordHash.str(
-            password,
-            crypto_pwhash_OPSLIMIT_MIN,
-            crypto_pwhash_MEMLIMIT_MIN
-        )
-        println("Hashed password for storage: ${hashedPassword.toHexString()}")
 
-        assertTrue {
-            PasswordHash.strVerify(
-                hashedPassword,
-                password
+        LibsodiumInitializer.initializeWithCallback {
+            val password = "correct horse battery staple"
+            val hashedPassword = PasswordHash.str(
+                password,
+                crypto_pwhash_OPSLIMIT_MIN,
+                crypto_pwhash_MEMLIMIT_MIN
             )
-        }
+            println("Hashed password for storage: ${hashedPassword.toHexString()}")
 
-        assertTrue {
-            PasswordHash.strNeedsRehash(hashedPassword, crypto_pwhash_OPSLIMIT_MIN, crypto_pwhash_MEMLIMIT_MIN) == 0
-        }
+            assertTrue {
+                PasswordHash.strVerify(
+                    hashedPassword,
+                    password
+                )
+            }
 
-        assertTrue {
-            PasswordHash.strNeedsRehash(hashedPassword, crypto_pwhash_OPSLIMIT_MIN, crypto_pwhash_MEMLIMIT_SENSITIVE) == 1
-        }
+            assertTrue {
+                PasswordHash.strNeedsRehash(hashedPassword, crypto_pwhash_OPSLIMIT_MIN, crypto_pwhash_MEMLIMIT_MIN) == 0
+            }
 
-        //TODO strNeedsRehash -1 case?
+            assertTrue {
+                PasswordHash.strNeedsRehash(hashedPassword, crypto_pwhash_OPSLIMIT_MIN, crypto_pwhash_MEMLIMIT_SENSITIVE) == 1
+            }
+
+            //TODO strNeedsRehash -1 case?
+        }
     }
 }

multiplatform-crypto-libsodium-bindings/src/jvmMain/kotlin/com/ionspin/kotlin/crypto/pwhash/PasswordHash.kt

@@ -0,0 +1,94 @@
+package com.ionspin.kotlin.crypto.pwhash
+
+import com.ionspin.kotlin.crypto.LibsodiumInitializer.sodium
+import com.sun.jna.NativeLong
+
+actual object PasswordHash {
+    /**
+     * The crypto_pwhash() function derives an outlen bytes long key from a password passwd whose length is passwdlen
+     * and a salt salt whose fixed length is crypto_pwhash_SALTBYTES bytes. passwdlen should be at least crypto_pwhash_
+     * PASSWD_MIN and crypto_pwhash_PASSWD_MAX. outlen should be at least crypto_pwhash_BYTES_MIN = 16 (128 bits) and
+     * at most crypto_pwhash_BYTES_MAX.
+     *
+     * See https://libsodium.gitbook.io/doc/password_hashing/default_phf for more details
+     */
+    actual fun pwhash(
+        outputLength: Int,
+        password: String,
+        salt: UByteArray,
+        opsLimit: ULong,
+        memLimit: Int,
+        algorithm: Int
+    ): UByteArray {
+        val hashedPassword = UByteArray(outputLength)
+
+        sodium.crypto_pwhash(
+            hashedPassword.asByteArray(),
+            outputLength.toLong(),
+            password.encodeToByteArray(),
+            password.length.toLong(),
+            salt.asByteArray(),
+            opsLimit.toLong(),
+            NativeLong(memLimit.toLong()),
+            algorithm
+        )
+
+        return hashedPassword
+    }
+
+    /**
+     * The crypto_pwhash_str() function puts an ASCII encoded string into out, which includes:
+     * the result of a memory-hard, CPU-intensive hash function applied to the   password passwd of length passwdlen
+     * the automatically generated salt used for the previous computation
+     * the other parameters required to verify the password, including the algorithm identifier, its version, opslimit and memlimit.
+     * out must be large enough to hold crypto_pwhash_STRBYTES bytes, but the actual output string may be shorter.
+     * The output string is zero-terminated, includes only ASCII characters and can be safely stored into SQL databases
+     * and other data stores. No extra information has to be stored in order to verify the password.
+     * The function returns 0 on success and -1 if it didn't complete successfully.
+     */
+    actual fun str(password: String, opslimit: ULong, memlimit: Int): UByteArray {
+        val output = ByteArray(crypto_pwhash_STRBYTES)
+        sodium.crypto_pwhash_str(
+            output,
+            password.encodeToByteArray(),
+            password.length.toLong(),
+            opslimit.toLong(),
+            NativeLong(memlimit.toLong())
+        )
+        return output.asUByteArray()
+    }
+
+    /**
+     * Check if a password verification string str matches the parameters opslimit and memlimit, and the current default algorithm.
+     * The function returns 1 if the string appears to be correct, but doesn't match the given parameters. In that situation, applications may want to compute a new hash using the current parameters the next time the user logs in.
+     * The function returns 0 if the parameters already match the given ones.
+     * It returns -1 on error. If it happens, applications may want to compute a correct hash the next time the user logs in.
+     */
+    actual fun strNeedsRehash(
+        passwordHash: UByteArray,
+        opslimit: ULong,
+        memlimit: Int
+    ): Int {
+        return sodium.crypto_pwhash_str_needs_rehash(
+            passwordHash.asByteArray(),
+            opslimit.toLong(),
+            NativeLong(memlimit.toLong())
+        )
+    }
+
+    /**
+     * his function verifies that str is a valid password verification string (as generated by crypto_pwhash_str()) for passwd whose length is passwdlen.
+     * str has to be zero-terminated.
+     * It returns 0 if the verification succeeds, and -1 on error.
+     */
+    actual fun strVerify(passwordHash: UByteArray, password: String): Boolean {
+        val result = sodium.crypto_pwhash_str_verify(
+            passwordHash.asByteArray(),
+            password.encodeToByteArray(),
+            password.length.toLong()
+        )
+
+        return result == 0
+    }
+
+}