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Obtaining a list of all valid SecurityModes

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Obtaining a list of all valid SecurityModes

June 13, 2022
18:35, EEST

hbrackel

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Forum Posts: 135

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February 21, 2014

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Hi there,

for validation purposes and also for providing the user with a drop down of all security modes to select from, I need to enumerate all possible securityModes, aka combinations of SecurityPolicies and MessageSecurityModes.
I tried 2 different approaches (code snippets are in Kotlin, but should be understandable by Java users as well):

val securityPolicies = SecurityPolicy.values()
val messageSecurityModes = MessageSecurityMode.values()

variant #1:

SecurityMode.combinations(messageSecurityModes.toSet(), securityPolicies.toSet())

resulting in:
[http://opcfoundation.org/UA/SecurityPolicy#Basic256,Sign]
[http://opcfoundation.org/UA/SecurityPolicy#None,None]
[http://opcfoundation.org/UA/SecurityPolicy#Basic256Sha256,Sign]
[http://opcfoundation.org/UA/SecurityPolicy#Basic128Rsa15,Sign]
[http://opcfoundation.org/UA/SecurityPolicy#Aes128_Sha256_RsaOaep,Sign]
[http://opcfoundation.org/UA/SecurityPolicy#Aes256_Sha256_RsaPss,Sign]
[http://opcfoundation.org/UA/SecurityPolicy#Basic256Sha256,SignAndEncrypt]
[http://opcfoundation.org/UA/SecurityPolicy#Basic256,SignAndEncrypt]
[http://opcfoundation.org/UA/SecurityPolicy#Basic128Rsa15,SignAndEncrypt]
[http://opcfoundation.org/UA/SecurityPolicy#Aes128_Sha256_RsaOaep,SignAndEncrypt]
[http://opcfoundation.org/UA/SecurityPolicy#Aes256_Sha256_RsaPss,SignAndEncrypt]

and variant 2#

securityPolicies.flatMap { policy -> messageSecurityModes.map { mode -> SecurityMode(policy, mode)}}

resulting in

[http://opcfoundation.org/UA/SecurityPolicy#None,None]
[http://opcfoundation.org/UA/SecurityPolicy#None,Sign]
[http://opcfoundation.org/UA/SecurityPolicy#None,SignAndEncrypt]
[http://opcfoundation.org/UA/SecurityPolicy#Basic128Rsa15,None]
[http://opcfoundation.org/UA/SecurityPolicy#Basic128Rsa15,Sign]
[http://opcfoundation.org/UA/SecurityPolicy#Basic128Rsa15,SignAndEncrypt]
[http://opcfoundation.org/UA/SecurityPolicy#Basic256,None]
[http://opcfoundation.org/UA/SecurityPolicy#Basic256,Sign]
[http://opcfoundation.org/UA/SecurityPolicy#Basic256,SignAndEncrypt]
[http://opcfoundation.org/UA/SecurityPolicy#Basic256Sha256,None]
[http://opcfoundation.org/UA/SecurityPolicy#Basic256Sha256,Sign]
[http://opcfoundation.org/UA/SecurityPolicy#Basic256Sha256,SignAndEncrypt]
[http://opcfoundation.org/UA/SecurityPolicy#Aes128_Sha256_RsaOaep,None]
[http://opcfoundation.org/UA/SecurityPolicy#Aes128_Sha256_RsaOaep,Sign]
[http://opcfoundation.org/UA/SecurityPolicy#Aes128_Sha256_RsaOaep,SignAndEncrypt]
[http://opcfoundation.org/UA/SecurityPolicy#Aes256_Sha256_RsaPss,None]
[http://opcfoundation.org/UA/SecurityPolicy#Aes256_Sha256_RsaPss,Sign]
[http://opcfoundation.org/UA/SecurityPolicy#Aes256_Sha256_RsaPss,SignAndEncrypt]

Obviously, not all results of the second variant make sense. Should the constructor

SecurityMode(policy, mode)

not throw an InvalidArgumentException (or similar) for any invalid combination of MessageSecurityMode and SecurityPolicy?

Thanks,
Hans-Uwe

June 14, 2022
9:52, EEST

Matti Siponen

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Forum Posts: 321

Member Since:
February 11, 2020

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Hello,

As mentioned in the documentation of the SecurityMode(SecurityPolicy securityPolicy, MessageSecurityMode messageSecurityMode) constructor: “Note! it is recommended to use the existing constants or the combinations(Set modes, Set policies) methods using the constants of the given classes instead of calling this directly.”

It’s true that the method could verify that the entered combination makes sense, but in general using this method shouldn’t be necessary as combinations method provides a set of valid SecurityModes and the static constant SecurityModes can be used instead of constructing new ones.

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