1 Reply by kingutoran98

(4 replies, posted in wolfCrypt)

HI embhorn,

Thank you very much for your reply. I got it work after disable the harden. However, is there any way I can still keep the harden and timing attack resistant while avoid that error. I am not sure, where to provide the RNG for that function, since the input only require private key, public key, buffer and its size.

Thank you in advance.

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2 Reply by kingutoran98

(4 replies, posted in wolfCrypt)

Hi embhorn,

I build wolfssl on Ubuntu terminal on Window machine and using --enable-all when do the configure.

I am implementing ECDH and later applied encrypt/decrypt. But I have trouble in the key exchange step before I can start the encrypt/decrypt part.

Thank you in advance.

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3 Topic by kingutoran98

(4 replies, posted in wolfCrypt)

Hello,

I am implementing exchange compress ecc key with wc_ecc_shared_secret, but I received -236 error (RNG required).

I have checked the init and make key are working well. I also already initiate the rng. I export the public key using wc_ecc_x963_ex ( &private_key, public_key, &size, 1)  (size = 33), if I am understand it correctly, p256 will return 33 bytes public key. I then import the public key using wc_ecc_x963 (public_key, 33, &pk_receive) where pk_receive is an initiated ecc_key.

To test the exchange key, I call wc_ecc_shared_secret( &another_private_key, &pk_receive, sharedSecret, &shareSec_size) and then I get the -236 error.

Could you please let me know where I did it wrong or what am I missing to use the shared_secret function.

Thank you in advance.

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