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openssl_public_decrypt() decrypts data that was previous encrypted via openssl_private_encrypt() and stores the result into decrypted. key must be the public key corresponding that was used to encrypt the data. padding defaults to OPENSSL_PKCS1_PADDING, but can also be OPENSSL_NO_PADDING.
如果成功则返回 TRUE，失败则返回 FALSE。
You can use this function e.g. to check if the message was written by the owner of the private key.
See also openssl_private_encrypt() and openssl_private_decrypt().