com.eduworks.ec.crypto

Class EcRsaOaep

java.lang.Object

com.eduworks.ec.crypto.EcRsaOaep

public class EcRsaOaep
extends Object

Helper methods for performing RSA Encryption methods. Uses Optimal Asymmetric Encryption Padding (OAEP) encryption and decryption. Uses RSA SSA PKCS#1 v1.5 (RSASSA-PKCS1-V1_5) signing and verifying with UTF8 encoding.

Author:

fritz.ray@eduworks.com

Constructor Summary

Constructors

Constructor and Description
EcRsaOaep()

Method Summary

Modifier and Type	Method and Description
static String	decrypt(EcPpk ppk, String ciphertext) Decrypts a block of ciphertext (no more than 256 bytes) with a private key using RSA OAEP encryption.
static String	encrypt(EcPk pk, String plaintext) Encrypts a block of plaintext (no more than 256 bytes) with a public key using RSA OAEP encryption.
static String	sign(EcPpk ppk, String text) Creates a signature for the provided text using the public private keypair.
static String	signSha256(EcPpk ppk, String text) Creates a signature for the provided text using the public private keypair.
static Boolean	verify(EcPk pk, String text, String signature) Verifies the integrity of the provided text using a signature and a public key.

Methods inherited from class java.lang.Object

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

Constructor Detail

EcRsaOaep

public EcRsaOaep()

Method Detail

encrypt

public static String encrypt(EcPk pk,
                             String plaintext)

Encrypts a block of plaintext (no more than 256 bytes) with a public key using RSA OAEP encryption. Returns a base64 encoded ciphertext.

Parameters:

{EcPk} - pk Public Key.

{string} - plaintext Plaintext. Does not perform encoding.

decrypt

public static String decrypt(EcPpk ppk,
                             String ciphertext)

Decrypts a block of ciphertext (no more than 256 bytes) with a private key using RSA OAEP encryption. Returns a unencoded plaintext.

Parameters:

{EcPpk} - ppk Public private keypair.

{string} - ciphertext Ciphertext.

Returns:

{string} Unencoded plaintext.

sign

public static String sign(EcPpk ppk,
                          String text)

Creates a signature for the provided text using the public private keypair. May be verified with the public key. Uses SHA1 hash with a UTF8 decoding of the text. Returns base64 encoded signature.

Parameters:

{EcPpk} - ppk Public private keypair.

{string} - text Text to sign.

Returns:

Base64 encoded signature.

signSha256

public static String signSha256(EcPpk ppk,
                                String text)

Creates a signature for the provided text using the public private keypair. May be verified with the public key. Uses SHA256 hash with a UTF8 decoding of the text. Returns base64 encoded signature.

Parameters:

{EcPpk} - ppk Public private keypair.

{string} - text Text to sign.

Returns:

Base64 encoded signature.

verify

public static Boolean verify(EcPk pk,
                             String text,
                             String signature)

Verifies the integrity of the provided text using a signature and a public key. Uses SHA1 hash with a UTF8 decoding of the text.

Parameters:

{EcPk} - pk Public key.

{string} - text Text to verify.

{string} - signature Base64 encoded signature.

Returns:

True IFF the signature is valid.