hostsharing/hs.hsadmin.ng
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password hash

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This commit is contained in:
Michael Hoennig 2024-07-12 10:18:52 +02:00
parent 95b830322a
commit 045361ade5
12 changed files with 217 additions and 164 deletions
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89
src/main/java/net/hostsharing/hsadminng/hash/HashGenerator.java Normal file
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@ -0,0 +1,89 @@
package net.hostsharing.hsadminng.hash;
import java.security.SecureRandom;
import java.util.Arrays;
import java.util.PriorityQueue;
import java.util.Queue;
import java.util.function.BiFunction;
import java.util.random.RandomGenerator;
import lombok.Getter;
/**
* Usage-example to generate hash:
* HashGenerator.using(LINUX_SHA512).withRandomSalt().hash("plaintext password");
*
* Usage-example to verify hash:
* HashGenerator.fromHash("hashed password).verify("plaintext password");
*/
@Getter
public final class HashGenerator {
private static final RandomGenerator random = new SecureRandom();
private static final Queue<String> predefinedSalts = new PriorityQueue<>();
public static final int RANDOM_SALT_LENGTH = 16;
private static final String RANDOM_SALT_CHARACTERS =
"abcdefghijklmnopqrstuvwxyz" +
"ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
"0123456789/.";
public enum Algorithm {
LINUX_SHA512(LinuxEtcShadowHashGenerator::hash, "6"),
LINUX_YESCRYPT(LinuxEtcShadowHashGenerator::hash, "y"),
MYSQL_NATIVE(MySQLNativePasswordHashGenerator::hash, "*");
final BiFunction<HashGenerator, String, String> implementation;
final String prefix;
Algorithm(BiFunction<HashGenerator, String, String> implementation, final String prefix) {
this.implementation = implementation;
this.prefix = prefix;
}
static Algorithm byPrefix(final String prefix) {
return Arrays.stream(Algorithm.values()).filter(a -> a.prefix.equals(prefix)).findAny()
.orElseThrow(() -> new IllegalArgumentException("unknown hash algorithm: '" + prefix + "'"));
}
}
private final Algorithm algorithm;
private String salt;
public static HashGenerator using(final Algorithm algorithm) {
return new HashGenerator(algorithm);
}
private HashGenerator(final Algorithm algorithm) {
this.algorithm = algorithm;
}
public String hash(final String plaintextPassword) {
if (plaintextPassword == null) {
throw new IllegalStateException("no password given");
}
return algorithm.implementation.apply(this, plaintextPassword);
}
public static void nextSalt(final String salt) {
predefinedSalts.add(salt);
}
public HashGenerator withSalt(final String salt) {
this.salt = salt;
return this;
}
public HashGenerator withRandomSalt() {
if (!predefinedSalts.isEmpty()) {
return withSalt(predefinedSalts.poll());
}
final var stringBuilder = new StringBuilder(RANDOM_SALT_LENGTH);
for (int i = 0; i < RANDOM_SALT_LENGTH; ++i) {
int randomIndex = random.nextInt(RANDOM_SALT_CHARACTERS.length());
stringBuilder.append(RANDOM_SALT_CHARACTERS.charAt(randomIndex));
}
return withSalt(stringBuilder.toString());
}
}

108
src/main/java/net/hostsharing/hsadminng/hash/LinuxEtcShadowHashGenerator.java
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@ -1,107 +1,31 @@
package net.hostsharing.hsadminng.hash;
import java.security.SecureRandom;
import java.util.Arrays;
import java.util.PriorityQueue;
import java.util.Queue;
import java.util.random.RandomGenerator;
import com.sun.jna.Library;
import com.sun.jna.Native;
public class LinuxEtcShadowHashGenerator {
private static final RandomGenerator random = new SecureRandom();
private static final Queue<String> predefinedSalts = new PriorityQueue<>();
public static final int SALT_LENGTH = 16;
private final String plaintextPassword;
private Algorithm algorithm;
public enum Algorithm {
SHA512("6"),
YESCRYPT("y");
final String prefix;
Algorithm(final String prefix) {
this.prefix = prefix;
}
static Algorithm byPrefix(final String prefix) {
return Arrays.stream(Algorithm.values()).filter(a -> a.prefix.equals(prefix)).findAny()
.orElseThrow(() -> new IllegalArgumentException("unknown hash algorithm: '" + prefix + "'"));
}
}
private static final String SALT_CHARACTERS =
"abcdefghijklmnopqrstuvwxyz" +
"ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
"0123456789/.";
private String salt;
public static LinuxEtcShadowHashGenerator hash(final String plaintextPassword) {
return new LinuxEtcShadowHashGenerator(plaintextPassword);
}
private LinuxEtcShadowHashGenerator(final String plaintextPassword) {
this.plaintextPassword = plaintextPassword;
}
public LinuxEtcShadowHashGenerator using(final Algorithm algorithm) {
this.algorithm = algorithm;
return this;
}
void verify(final String givenHash) {
final var parts = givenHash.split("\\$");
if (parts.length < 3 || parts.length > 5) {
throw new IllegalArgumentException("not a " + algorithm.name() + " Linux hash: " + givenHash);
}
algorithm = Algorithm.byPrefix(parts[1]);
salt = parts.length == 4 ? parts[2] : parts[2] + "$" + parts[3];
if (!generate().equals(givenHash)) {
throw new IllegalArgumentException("invalid password");
}
}
public String generate() {
if (salt == null) {
public static String hash(final HashGenerator generator, final String payload) {
if (generator.getSalt() == null) {
throw new IllegalStateException("no salt given");
}
if (plaintextPassword == null) {
throw new IllegalStateException("no password given");
return NativeCryptLibrary.INSTANCE.crypt(payload, "$" + generator.getAlgorithm().prefix + "$" + generator.getSalt());
}
public static void verify(final String givenHash, final String payload) {
final var parts = givenHash.split("\\$");
if (parts.length < 3 || parts.length > 5) {
throw new IllegalArgumentException("hash with unknown hash method: " + givenHash);
}
return NativeCryptLibrary.INSTANCE.crypt(plaintextPassword, "$" + algorithm.prefix + "$" + salt);
}
public static void nextSalt(final String salt) {
predefinedSalts.add(salt);
}
public LinuxEtcShadowHashGenerator withSalt(final String salt) {
this.salt = salt;
return this;
}
public LinuxEtcShadowHashGenerator withRandomSalt() {
if (!predefinedSalts.isEmpty()) {
return withSalt(predefinedSalts.poll());
final var algorithm = HashGenerator.Algorithm.byPrefix(parts[1]);
final var salt = parts.length == 4 ? parts[2] : parts[2] + "$" + parts[3];
final var calcualatedHash = HashGenerator.using(algorithm).withSalt(salt).hash(payload);
if (!calcualatedHash.equals(givenHash)) {
throw new IllegalArgumentException("invalid password");
}
final var stringBuilder = new StringBuilder(SALT_LENGTH);
for (int i = 0; i < SALT_LENGTH; ++i) {
int randomIndex = random.nextInt(SALT_CHARACTERS.length());
stringBuilder.append(SALT_CHARACTERS.charAt(randomIndex));
}
return withSalt(stringBuilder.toString());
}
public static void main(String[] args) {
System.out.println(NativeCryptLibrary.INSTANCE.crypt("given password", "$6$abcdefghijklmno"));
}
public interface NativeCryptLibrary extends Library {

35
src/main/java/net/hostsharing/hsadminng/hash/MySQLNativePasswordHashGenerator.java Normal file
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@ -0,0 +1,35 @@
package net.hostsharing.hsadminng.hash;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class MySQLNativePasswordHashGenerator {
public static String hash(final HashGenerator generator, final String password) {
// TODO.impl: if a random salt is generated or not should be part of the algorithm definition
// if (generator.getSalt() != null) {
// throw new IllegalStateException("salt not supported");
// }
try {
final var sha1 = MessageDigest.getInstance("SHA-1");
final var firstHash = sha1.digest(password.getBytes());
final var secondHash = sha1.digest(firstHash);
return "*" + bytesToHex(secondHash).toUpperCase();
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException("SHA-1 algorithm not found", e);
}
}
private static String bytesToHex(byte[] bytes) {
final var hexString = new StringBuilder();
for (byte b : bytes) {
final var hex = Integer.toHexString(0xff & b);
if (hex.length() == 1) {
hexString.append('0');
}
hexString.append(hex);
}
return hexString.toString();
}
}

4
src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsMariaDbUserHostingAssetValidator.java
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@ -1,6 +1,6 @@
package net.hostsharing.hsadminng.hs.hosting.asset.validators;
import net.hostsharing.hsadminng.hash.LinuxEtcShadowHashGenerator;
import net.hostsharing.hsadminng.hash.HashGenerator;
import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetEntity;
import java.util.regex.Pattern;
@ -22,7 +22,7 @@ class HsMariaDbUserHostingAssetValidator extends HostingAssetEntityValidator {
// referenceProperty(assignedToAsset).isWriteOnce(),
// );
passwordProperty("password").minLength(8).maxLength(40).hashedUsing(LinuxEtcShadowHashGenerator.Algorithm.SHA512).writeOnly());
passwordProperty("password").minLength(8).maxLength(40).hashedUsing(HashGenerator.Algorithm.MYSQL_NATIVE).writeOnly());
}
@Override

5
src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsUnixUserHostingAssetValidator.java
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@ -1,6 +1,6 @@
package net.hostsharing.hsadminng.hs.hosting.asset.validators;
import net.hostsharing.hsadminng.hash.LinuxEtcShadowHashGenerator;
import net.hostsharing.hsadminng.hash.HashGenerator;
import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetEntity;
import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType;
import net.hostsharing.hsadminng.hs.validation.PropertiesProvider;
@ -30,7 +30,8 @@ class HsUnixUserHostingAssetValidator extends HostingAssetEntityValidator {
.withDefault("/bin/false"),
stringProperty("homedir").readOnly().computedBy(HsUnixUserHostingAssetValidator::computeHomedir),
stringProperty("totpKey").matchesRegEx("^0x([0-9A-Fa-f]{2})+$").minLength(20).maxLength(256).undisclosed().writeOnly().optional(),
passwordProperty("password").minLength(8).maxLength(40).hashedUsing(LinuxEtcShadowHashGenerator.Algorithm.SHA512).writeOnly());
passwordProperty("password").minLength(8).maxLength(40).hashedUsing(HashGenerator.Algorithm.LINUX_SHA512).writeOnly());
// TODO.spec: private SSH keys?
}
@Override

6
src/main/java/net/hostsharing/hsadminng/hs/validation/PasswordProperty.java
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@ -1,13 +1,13 @@
package net.hostsharing.hsadminng.hs.validation;
import net.hostsharing.hsadminng.hash.LinuxEtcShadowHashGenerator.Algorithm;
import net.hostsharing.hsadminng.hash.HashGenerator;
import net.hostsharing.hsadminng.hash.HashGenerator.Algorithm;
import lombok.Setter;
import java.util.List;
import java.util.stream.Stream;
import static java.util.Optional.ofNullable;
import static net.hostsharing.hsadminng.hash.LinuxEtcShadowHashGenerator.hash;
import static net.hostsharing.hsadminng.mapper.Array.insertNewEntriesAfterExistingEntry;
@Setter
@ -36,7 +36,7 @@ public class PasswordProperty extends StringProperty<PasswordProperty> {
this.hashedUsing = algorithm;
computedBy((entity)
-> ofNullable(entity.getDirectValue(propertyName, String.class))
.map(password -> hash(password).using(algorithm).withRandomSalt().generate())
.map(password -> HashGenerator.using(algorithm).withRandomSalt().hash(password))
.orElse(null));
return self();
}

56
src/test/java/net/hostsharing/hsadminng/hash/HashGeneratorUnitTest.java Normal file
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@ -0,0 +1,56 @@
package net.hostsharing.hsadminng.hash;
import org.junit.jupiter.api.Test;
import static net.hostsharing.hsadminng.hash.HashGenerator.Algorithm.LINUX_SHA512;
import static net.hostsharing.hsadminng.hash.HashGenerator.Algorithm.MYSQL_NATIVE;
import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.catchThrowable;
class HashGeneratorUnitTest {
final String GIVEN_PASSWORD = "given password";
final String WRONG_PASSWORD = "wrong password";
final String GIVEN_SALT = "0123456789abcdef";
// generated via mkpasswd for plaintext password GIVEN_PASSWORD (see above)
final String GIVEN_LINUX_SHA512_HASH = "$6$ooei1HK6JXVaI7KC$sY5d9fEOr36hjh4CYwIKLMfRKL1539bEmbVCZ.zPiH0sv7jJVnoIXb5YEefEtoSM2WWgDi9hr7vXRe3Nw8zJP/";
final String GIVEN_LINUX_YESCRYPT_HASH = "$y$j9T$wgYACPmBXvlMg2MzeZA0p1$KXUzd28nG.67GhPnBZ3aZsNNA5bWFdL/dyG4wS0iRw7";
@Test
void verifiesLinuxPasswordAgainstSha512HashFromMkpasswd() {
LinuxEtcShadowHashGenerator.verify(GIVEN_LINUX_SHA512_HASH, GIVEN_PASSWORD); // throws exception if wrong
}
@Test
void verifiesLinuxPasswordAgainstYescryptHashFromMkpasswd() {
LinuxEtcShadowHashGenerator.verify(GIVEN_LINUX_YESCRYPT_HASH, GIVEN_PASSWORD); // throws exception if wrong
}
@Test
void verifiesHashedLinuxPasswordWithRandomSalt() {
final var hash = HashGenerator.using(LINUX_SHA512).withRandomSalt().hash(GIVEN_PASSWORD);
LinuxEtcShadowHashGenerator.verify(hash, GIVEN_PASSWORD); // throws exception if wrong
}
@Test
void verifiesLinuxHashedPasswordWithGivenSalt() {
final var hash = HashGenerator.using(LINUX_SHA512).withSalt(GIVEN_SALT).hash(GIVEN_PASSWORD);
LinuxEtcShadowHashGenerator.verify(hash, GIVEN_PASSWORD); // throws exception if wrong
}
@Test
void throwsExceptionForInvalidLinuxPassword() {
final var hash = HashGenerator.using(LINUX_SHA512).withRandomSalt().hash(GIVEN_PASSWORD);
final var throwable = catchThrowable(() ->
LinuxEtcShadowHashGenerator.verify(hash, WRONG_PASSWORD)
);
assertThat(throwable).hasMessage("invalid password");
}
@Test
void verifiesMySqlNativePassword() {
final var hash = HashGenerator.using(MYSQL_NATIVE).hash("Test1234");
assertThat(hash).isEqualTo("*14F1A8C42F8B6D4662BB3ED290FD37BF135FE45C");
}
}

51
src/test/java/net/hostsharing/hsadminng/hash/LinuxEtcShadowHashGeneratorUnitTest.java
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@ -1,51 +0,0 @@
package net.hostsharing.hsadminng.hash;
import org.junit.jupiter.api.Test;
import static net.hostsharing.hsadminng.hash.LinuxEtcShadowHashGenerator.Algorithm.SHA512;
import static net.hostsharing.hsadminng.hash.LinuxEtcShadowHashGenerator.hash;
import static org.assertj.core.api.Assertions.assertThat;
import static org.assertj.core.api.Assertions.catchThrowable;
class LinuxEtcShadowHashGeneratorUnitTest {
final String GIVEN_PASSWORD = "given password";
final String WRONG_PASSWORD = "wrong password";
final String GIVEN_SALT = "0123456789abcdef";
// generated via mkpasswd for plaintext password GIVEN_PASSWORD (see above)
final String GIVEN_SHA512_HASH = "$6$ooei1HK6JXVaI7KC$sY5d9fEOr36hjh4CYwIKLMfRKL1539bEmbVCZ.zPiH0sv7jJVnoIXb5YEefEtoSM2WWgDi9hr7vXRe3Nw8zJP/";
final String GIVEN_YESCRYPT_HASH = "$y$j9T$wgYACPmBXvlMg2MzeZA0p1$KXUzd28nG.67GhPnBZ3aZsNNA5bWFdL/dyG4wS0iRw7";
@Test
void verifiesPasswordAgainstSha512HashFromMkpasswd() {
hash(GIVEN_PASSWORD).verify(GIVEN_SHA512_HASH); // throws exception if wrong
}
@Test
void verifiesPasswordAgainstYescryptHashFromMkpasswd() {
hash(GIVEN_PASSWORD).verify(GIVEN_YESCRYPT_HASH); // throws exception if wrong
}
@Test
void verifiesHashedPasswordWithRandomSalt() {
final var hash = hash(GIVEN_PASSWORD).using(SHA512).withRandomSalt().generate();
hash(GIVEN_PASSWORD).verify(hash); // throws exception if wrong
}
@Test
void verifiesHashedPasswordWithGivenSalt() {
final var givenPasswordHash =hash(GIVEN_PASSWORD).using(SHA512).withSalt(GIVEN_SALT).generate();
hash(GIVEN_PASSWORD).verify(givenPasswordHash); // throws exception if wrong
}
@Test
void throwsExceptionForInvalidPassword() {
final var givenPasswordHash = hash(GIVEN_PASSWORD).using(SHA512).withRandomSalt().generate();
final var throwable = catchThrowable(() ->
hash(WRONG_PASSWORD).verify(givenPasswordHash) // throws exception if wrong);
);
assertThat(throwable).hasMessage("invalid password");
}
}

4
src/test/java/net/hostsharing/hsadminng/hs/hosting/asset/HsHostingAssetControllerAcceptanceTest.java
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@ -3,7 +3,7 @@ package net.hostsharing.hsadminng.hs.hosting.asset;
import io.restassured.RestAssured;
import io.restassured.http.ContentType;
import net.hostsharing.hsadminng.HsadminNgApplication;
import net.hostsharing.hsadminng.hash.LinuxEtcShadowHashGenerator;
import net.hostsharing.hsadminng.hash.HashGenerator;
import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemEntity;
import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemRepository;
import net.hostsharing.hsadminng.hs.booking.item.HsBookingItemType;
@ -537,7 +537,7 @@ class HsHostingAssetControllerAcceptanceTest extends ContextBasedTestWithCleanup
.identifier("fir01-temp")
.caption("some test-unix-user")
.build());
LinuxEtcShadowHashGenerator.nextSalt("Jr5w/Y8zo8pCkqg7");
HashGenerator.nextSalt("Jr5w/Y8zo8pCkqg7");
RestAssured // @formatter:off
.given()

9
src/test/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsMariaDbUserHostingAssetValidatorUnitTest.java
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@ -1,6 +1,5 @@
package net.hostsharing.hsadminng.hs.hosting.asset.validators;
import net.hostsharing.hsadminng.hash.LinuxEtcShadowHashGenerator;
import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetEntity;
import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetEntity.HsHostingAssetEntityBuilder;
import org.junit.jupiter.api.Test;
@ -33,7 +32,7 @@ class HsMariaDbUserHostingAssetValidatorUnitTest {
.identifier("xyz00_temp")
.caption("some valid test MariaDB-User")
.config(new HashMap<>(ofEntries(
entry("password", "Hallo Datenbank, lass mich rein!")
entry("password", "Test1234")
)));
}
@ -47,7 +46,7 @@ class HsMariaDbUserHostingAssetValidatorUnitTest {
// then
assertThat(props).extracting(Object::toString).containsExactlyInAnyOrder(
"{type=password, propertyName=password, minLength=8, maxLength=40, writeOnly=true, computed=true, hashedUsing=SHA512, undisclosed=true}"
"{type=password, propertyName=password, minLength=8, maxLength=40, writeOnly=true, computed=true, hashedUsing=MYSQL_NATIVE, undisclosed=true}"
);
}
@ -58,12 +57,12 @@ class HsMariaDbUserHostingAssetValidatorUnitTest {
final var validator = HostingAssetEntityValidatorRegistry.forType(givenMariaDbUserHostingAsset.getType());
// when
LinuxEtcShadowHashGenerator.nextSalt("Ly3LbsArtL5u4EVt"); // FIXME
// HashGenerator.nextSalt("Ly3LbsArtL5u4EVt"); // not needed for mysql_native_password
validator.prepareProperties(givenMariaDbUserHostingAsset);
// then
assertThat(givenMariaDbUserHostingAsset.getConfig()).containsExactlyInAnyOrderEntriesOf(ofEntries(
entry("password", "$6$Ly3LbsArtL5u4EVt$T7VM5uCq7I1cKttipCX4TQdyawdpLcSmjApreI4fZcORPOkEkxy9iz.9Dri6IVbO08OKTR8OE8hvnblU5Ax6o.")
entry("password", "*14F1A8C42F8B6D4662BB3ED290FD37BF135FE45C")
));
}

6
src/test/java/net/hostsharing/hsadminng/hs/hosting/asset/validators/HsUnixUserHostingAssetValidatorUnitTest.java
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@ -1,6 +1,6 @@
package net.hostsharing.hsadminng.hs.hosting.asset.validators;
import net.hostsharing.hsadminng.hash.LinuxEtcShadowHashGenerator;
import net.hostsharing.hsadminng.hash.HashGenerator;
import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetEntity;
import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType;
import org.junit.jupiter.api.Test;
@ -50,7 +50,7 @@ class HsUnixUserHostingAssetValidatorUnitTest {
final var validator = HostingAssetEntityValidatorRegistry.forType(unixUserHostingAsset.getType());
// when
LinuxEtcShadowHashGenerator.nextSalt("Ly3LbsArtL5u4EVt");
HashGenerator.nextSalt("Ly3LbsArtL5u4EVt");
validator.prepareProperties(unixUserHostingAsset);
// then
@ -141,7 +141,7 @@ class HsUnixUserHostingAssetValidatorUnitTest {
final var validator = HostingAssetEntityValidatorRegistry.forType(unixUserHostingAsset.getType());
// when
LinuxEtcShadowHashGenerator.nextSalt("Ly3LbsArtL5u4EVt");
HashGenerator.nextSalt("Ly3LbsArtL5u4EVt");
final var result = validator.revampProperties(unixUserHostingAsset, unixUserHostingAsset.getConfig());
// then

8
src/test/java/net/hostsharing/hsadminng/hs/validation/PasswordPropertyUnitTest.java
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@ -1,5 +1,6 @@
package net.hostsharing.hsadminng.hs.validation;
import net.hostsharing.hsadminng.hash.LinuxEtcShadowHashGenerator;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.ValueSource;
@ -8,8 +9,7 @@ import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import static net.hostsharing.hsadminng.hash.LinuxEtcShadowHashGenerator.Algorithm.SHA512;
import static net.hostsharing.hsadminng.hash.LinuxEtcShadowHashGenerator.hash;
import static net.hostsharing.hsadminng.hash.HashGenerator.Algorithm.LINUX_SHA512;
import static net.hostsharing.hsadminng.hs.validation.PasswordProperty.passwordProperty;
import static net.hostsharing.hsadminng.mapper.PatchableMapWrapper.entry;
import static org.assertj.core.api.Assertions.assertThat;
@ -17,7 +17,7 @@ import static org.assertj.core.api.Assertions.assertThat;
class PasswordPropertyUnitTest {
private final ValidatableProperty<PasswordProperty, String> passwordProp =
passwordProperty("password").minLength(8).maxLength(40).hashedUsing(SHA512).writeOnly();
passwordProperty("password").minLength(8).maxLength(40).hashedUsing(LINUX_SHA512).writeOnly();
private final List<String> violations = new ArrayList<>();
@ParameterizedTest
@ -115,6 +115,6 @@ class PasswordPropertyUnitTest {
});
// then
hash("some password").using(SHA512).withRandomSalt().generate(); // throws exception if wrong
LinuxEtcShadowHashGenerator.verify(result, "some password"); // throws exception if wrong
}
}