Class Signature

java.lang.Object

com.codename1.security.Signature

public final class Signature
extends Object

Digital signature creation and verification. Backed by the platform's native crypto provider -- works with PublicKey / PrivateKey objects from this package.

Example: sign with RSA-SHA-256 and verify

KeyPair kp = KeyGenerator.rsa(2048);
byte[] sig = Signature.sign(Signature.SHA256_WITH_RSA, kp.getPrivateKey(), data);
boolean ok = Signature.verify(Signature.SHA256_WITH_RSA, kp.getPublicKey(), data, sig);

Field Summary

Fields

Modifier and Type	Field	Description
static final String	SHA256_WITH_ECDSA	SHA256withECDSA -- ECDSA with SHA-256 (P-256 curve).
static final String	SHA256_WITH_RSA	SHA256withRSA -- RSA PKCS#1 v1.5 with SHA-256.
static final String	SHA384_WITH_ECDSA	SHA384withECDSA -- ECDSA with SHA-384 (P-384 curve).
static final String	SHA384_WITH_RSA	SHA384withRSA -- RSA PKCS#1 v1.5 with SHA-384.
static final String	SHA512_WITH_ECDSA	SHA512withECDSA -- ECDSA with SHA-512 (P-521 curve).
static final String	SHA512_WITH_RSA	SHA512withRSA -- RSA PKCS#1 v1.5 with SHA-512.

Method Summary

Modifier and Type	Method	Description
static byte[]	sign(String algorithm, PrivateKey key, byte[] data)	Signs data with the given algorithm and private key.
static boolean	verify(String algorithm, PublicKey key, byte[] data, byte[] signature)	Verifies signature against data using the given algorithm and public key.

Methods inherited from class Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

SHA256_WITH_RSA

public static final String SHA256_WITH_RSA

SHA256withRSA -- RSA PKCS#1 v1.5 with SHA-256.

See Also:

• Constant Field Values

SHA384_WITH_RSA

public static final String SHA384_WITH_RSA

SHA384withRSA -- RSA PKCS#1 v1.5 with SHA-384.

See Also:

• Constant Field Values

SHA512_WITH_RSA

public static final String SHA512_WITH_RSA

SHA512withRSA -- RSA PKCS#1 v1.5 with SHA-512.

See Also:

• Constant Field Values

SHA256_WITH_ECDSA

public static final String SHA256_WITH_ECDSA

SHA256withECDSA -- ECDSA with SHA-256 (P-256 curve).

See Also:

• Constant Field Values

SHA384_WITH_ECDSA

public static final String SHA384_WITH_ECDSA

SHA384withECDSA -- ECDSA with SHA-384 (P-384 curve).

See Also:

• Constant Field Values

SHA512_WITH_ECDSA

public static final String SHA512_WITH_ECDSA

SHA512withECDSA -- ECDSA with SHA-512 (P-521 curve).

See Also:

• Constant Field Values

Method Details

sign

public static byte[] sign(String algorithm,
 PrivateKey key,
 byte[] data)

Signs data with the given algorithm and private key.

verify

public static boolean verify(String algorithm,
 PublicKey key,
 byte[] data,
 byte[] signature)

Verifies signature against data using the given algorithm and public key.