Provides programming elements for Public Key Cryptography Standards (PKCS), including methods for signing data, exchanging keys, requesting certificates, public key encryption and decryption, and other security functions.

• 提供公钥加密标准(PKCS)的编程元素,包括用于签名数据、交换密钥、请求证书、公钥加密和解密以及其他安全功能的方法。