swift 在iOS10之后，支持ecdh加解密。
1.生成公钥和私钥。
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| func generateKey() {
let attributes: [String: Any] = [kSecAttrKeySizeInBits as String: 256,
kSecAttrKeyType as String: kSecAttrKeyTypeEC,
kSecPrivateKeyAttrs as String: [kSecAttrIsPermanent as String: false]]
var error: Unmanaged<CFError>?
self.privateKey = SecKeyCreateRandomKey(attributes as CFDictionary, &error)
if self.privateKey != nil {
self.publicKey = SecKeyCopyPublicKey(self.privateKey!)
}
}
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2.加密
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| func encryptedData(sourceData: Data, algorithm:SecKeyAlgorithm) -> Data? {
guard self.publicKey != nil else {
return nil
}
var error: Unmanaged<CFError>?
let encrypted =
SecKeyCreateEncryptedData(self.publicKey!, algorithm,
sourceData as CFData,
&error)
if error == nil {
return encrypted! as Data
}
return nil
}
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3.解密
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| func decryptedData(sourceData: Data, algorithm:SecKeyAlgorithm ) -> String? {
var error: Unmanaged<CFError>?
let resData = SecKeyCreateDecryptedData(self.privateKey! , algorithm,
sourceData as CFData, &error)
if error == nil {
return String(data: resData! as Data, encoding: String.Encoding.utf8)
}
return nil
}
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4.示例
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| let sign = YKEcdhSign()
sign.generateKey()
let enData = sign.encryptedData(sourceData: originalData!, algorithm: SecKeyAlgorithm.eciesEncryptionStandardX963SHA512AESGCM)
let string = sign.decryptedData(sourceData: enData!, algorithm: SecKeyAlgorithm.eciesEncryptionStandardX963SHA512AESGCM)
print(string!)
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