CryptographicEngine.Decrypt(CryptographicKey, IBuffer, IBuffer) 方法
定义
重要
一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。 对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。
解密以前使用对称或非对称算法加密的内容。
public:
static IBuffer ^ Decrypt(CryptographicKey ^ key, IBuffer ^ data, IBuffer ^ iv); static IBuffer Decrypt(CryptographicKey const& key, IBuffer const& data, IBuffer const& iv);public static IBuffer Decrypt(CryptographicKey key, IBuffer data, IBuffer iv);function decrypt(key, data, iv)Public Shared Function Decrypt (key As CryptographicKey, data As IBuffer, iv As IBuffer) As IBuffer参数
- key
- CryptographicKey
用于解密的加密密钥。 这可以是非对称密钥，也可以是对称密钥。 有关详细信息，请参阅 AsymmetricKeyAlgorithmProvider 和 SymmetricKeyAlgorithmProvider。
- data
- IBuffer
包含加密数据的缓冲区。
返回
已解密的数据。
示例
public void SampleCipherDecryption(
String strAlgName,
IBuffer buffEncrypt,
IBuffer iv,
BinaryStringEncoding encoding,
CryptographicKey key)
{
// Declare a buffer to contain the decrypted data.
IBuffer buffDecrypted;
// Open an symmetric algorithm provider for the specified algorithm.
SymmetricKeyAlgorithmProvider objAlg = SymmetricKeyAlgorithmProvider.OpenAlgorithm(strAlgName);
// The input key must be securely shared between the sender of the encrypted message
// and the recipient. The initialization vector must also be shared but does not
// need to be shared in a secure manner. If the sender encodes a message string
// to a buffer, the binary encoding method must also be shared with the recipient.
buffDecrypted = CryptographicEngine.Decrypt(key, buffEncrypt, iv);
// Convert the decrypted buffer to a string (for display). If the sender created the
// original message buffer from a string, the sender must tell the recipient what
// BinaryStringEncoding value was used. Here, BinaryStringEncoding.Utf8 is used to
// convert the message to a buffer before encryption and to convert the decrypted
// buffer back to the original plaintext.
String strDecrypted = CryptographicBuffer.ConvertBinaryToString(encoding, buffDecrypted);
}
注解
key 参数可以是使用 PersistedKeyProvider 类从证书获取的持久密钥。
如果密钥是持久密钥，并且解密操作需要 UI 或花费很长时间，请改用 DecryptAsync 方法。 例如，使用受强保护的密钥进行解密时，需要 UI。 如果使用持久化密钥且需要 UI，请使用 DecryptAsync 方法，因为 Decrypt 方法将失败。