How to use

decrypt

method

in

com.eduworks.ec.crypto.EcAesCtr

/**
 * Decrypts an encrypted value into a string using an alternative secret.
 *
 * @return {String} Decrypted string value
 * @memberOf EcEncryptedValue
 * @method decryptIntoString
 */
public String decryptIntoStringUsingSecret(EbacEncryptedSecret decryptSecret) {
  if (decryptSecret != null) {
    return EcAesCtr.decrypt(payload, decryptSecret.secret, decryptSecret.iv);
  }
  return null;
}

/**
 * Decrypts an encrypted value into a string
 *
 * @return {String} Decrypted string value
 * @memberOf EcEncryptedValue
 * @method decryptIntoString
 */
public String decryptIntoString() {
  EbacEncryptedSecret decryptSecret = decryptSecret();
  if (decryptSecret != null) {
    return EcAesCtr.decrypt(payload, decryptSecret.secret, decryptSecret.iv);
  }
  return null;
}

/**
 * Helper function to decrypt an encrypted contact (storable version of an contact)
 * into an contact
 *
 * @param {EbacContact} contact
 *                      Contact to decrypt.
 * @param {String}      secret
 *                      AES secret used to decrypt the credential.
 * @param {String}      source
 *                      Source of the credential, used to track where a contact
 *                      came from.
 * @return {EcContact}
 * Decrypted identity object, ready for use.
 * @memberOf EcContact
 * @method fromEncryptedContact
 * @static
 */
public static EcContact fromEncryptedContact(EbacContact contact, String secret, String source) {
  EcContact i = new EcContact();
  i.pk = EcPk.fromPem(EcAesCtr.decrypt(contact.pk, secret, contact.iv));
  i.source = source;
  if (contact.displayName != null && contact.displayNameIv != null)
    i.displayName = EcAesCtr.decrypt(contact.displayName, secret, contact.iv);
  return i;
}

/**
 * Helper function to decrypt a credential (storable version of an identity)
 * into an identity)
 *
 * @param {EbacCredential} credential
 *                         Credential to decrypt.
 * @param {String}         secret
 *                         AES secret used to decrypt the credential.
 * @param {String}         source
 *                         Source of the credential, used to track where a credential
 *                         came from.
 * @return {EcIdentity}
 * Decrypted identity object, ready for use.
 * @memberOf EcIdentity
 * @method fromCredential
 * @static
 */
public static EcIdentity fromCredential(EbacCredential credential, String secret, String source) {
  EcIdentity i = new EcIdentity();
  i.ppk = EcPpk.fromPem(EcAesCtr.decrypt(credential.ppk, secret, credential.iv));
  i.source = source;
  if (credential.displayName != null && credential.displayNameIv != null)
    i.displayName = EcAesCtr.decrypt(credential.displayName, secret, credential.iv);
  return i;
}