[英]EXC_BAD_ACCESS code=257 at SecKeyIsAlgorithmSupported
I have a KeyChain class where I sign a string.我有一个 KeyChain class 我在其中签署了一个字符串。 I got
Thread 8: EXC_BAD_ACCESS (code=257, address=0x3fd574bc6a7ef9db)
error at SecKeyIsAlgorithmSupported
function.我在 SecKeyIsAlgorithmSupported function 处遇到
Thread 8: EXC_BAD_ACCESS (code=257, address=0x3fd574bc6a7ef9db)
SecKeyIsAlgorithmSupported
。 I could not figure out why this error pops up.我无法弄清楚为什么会弹出这个错误。 When I use the
getquery
variable which is commented it all works fine except on iPhone 13 pro max devices.当我使用被注释的
getquery
变量时,除了在 iPhone 13 pro max 设备上之外,它都可以正常工作。 So I wanted to try different queries hoping that can work on all devices.所以我想尝试不同的查询,希望可以在所有设备上运行。 But in that case SecKeyIsAlgorithmSupported function crashes giving this error
EXC_BAD_ACCESS
.但在这种情况下,SecKeyIsAlgorithmSupported function 崩溃,给出此错误
EXC_BAD_ACCESS
。 Here is the function I use.这是我使用的 function。
func signString(clearString:String) -> Bool {
/*let getquery: [String: Any] = [kSecClass as String: kSecClassKey,
kSecAttrApplicationTag as String: serviceName,
kSecAttrKeyType as String: kSecAttrKeyTypeECSECPrimeRandom,
kSecReturnRef as String: true]*/
let getquery: [String: Any] = [kSecClass as String: kSecClassGenericPassword,
kSecAttrService as String: serviceName,
kSecReturnAttributes as String: kCFBooleanTrue!,
kSecMatchLimit as String: kSecMatchLimitAll]
var item: CFTypeRef?
let status = SecItemCopyMatching(getquery as CFDictionary, &item)
print("status = ",status)
if (status != errSecSuccess) {
print("No key found")
return false
}
else {
let key = item as! SecKey
self.privateKey = key
let data = clearString.data(using: .utf8)! as CFData
let algorithm: SecKeyAlgorithm = .ecdsaSignatureMessageX962SHA256
if (self.privateKey != nil) {
guard SecKeyIsAlgorithmSupported(self.privateKey!, .sign, algorithm) else {
print("Algorithm Not Supported")
return false
}
var error: Unmanaged<CFError>?
guard let signature = SecKeyCreateSignature(self.privateKey!,algorithm, data, &error) as Data? else {
print("signature error")
return false
}
self.signedString = signature.base64EncodedString()
return true
}
else {
print("Private Key is null")
return false
}
}
}
I wish there would be a way to avoid this crash.我希望有办法避免这种崩溃。 I searched about it but I could not find a way to fix that.
我搜索了一下,但找不到解决方法。 Any help will be appreciated.
任何帮助将不胜感激。 Thanks in advance.
提前致谢。
Your get query states kSecMatchLimitAll
, which will result in a CFArray
object as a result.您的 get 查询状态
kSecMatchLimitAll
,结果将导致CFArray
object 。 You can easily fix that by changing it to kSecMatchLimitOne
, or you can loop the list, by casting it to an array.您可以通过将其更改为
kSecMatchLimitOne
轻松解决此问题,或者您可以循环列表,将其转换为数组。
let keys = item as! [SecKey]
for key in keys {
SecKeyIsAlgorithmSupported(key, .sign, . ecdsaSignatureMessageX962SHA256)
}
Do note that not all generic items, or likely none, are valid SecKey
objects.请注意,并非所有通用项目,或者可能没有,都是有效的
SecKey
对象。 It appears you're using ECC keys, which can be stored using the kSecClass: kSecClassKey
attribute.看来您正在使用 ECC 密钥,可以使用
kSecClass: kSecClassKey
属性进行存储。 I would highly recommend storing it as what it is, instead of storing it as a generic password ( kSecClassGenericPassword
) as you're doing right now我强烈建议将其按原样存储,而不是像现在这样将其存储为通用密码 (
kSecClassGenericPassword
)
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