76.7. 动态提供密钥

当使用 Recipient 列表或类似的 EIP 时，交换的收件人可能会动态变化。在所有收件人中使用相同密钥可能并不可行。能够在每次交换时动态指定密钥会很有用。然后，在由数据格式处理前，交换可以被动态地利用其目标接收者的密钥进行动态增强。为便于此数据，DataFormat 允许通过下面的消息标题动态提供密钥

CryptoDataFormat cryptoFormat = new CryptoDataFormat("DES", null);
/**
 * Note: the header containing the key should be cleared after
 * marshalling to stop it from leaking by accident and
 * potentially being compromised. The processor version below is
 * arguably better as the key is left in the header when you use
 * the DSL leaks the fact that camel encryption was used.
 */
from("direct:key-in-header-encrypt")
    .marshal(cryptoFormat)
    .removeHeader(CryptoDataFormat.KEY)
    .to("mock:encrypted");

from("direct:key-in-header-decrypt").unmarshal(cryptoFormat).process(new Processor() {
    public void process(Exchange exchange) throws Exception {
        exchange.getIn().getHeaders().remove(CryptoDataFormat.KEY);
        exchange.getOut().copyFrom(exchange.getIn());
    }
}).to("mock:unencrypted");

也可借助 spring。

<crypto id="nokey" algorithm="DES" />