Topic: How to use AES GCM 128 algorithm
Hi,
I am new to AES GCM 128 algorithm .
I want to use the AES-GCM mode for encryption/decryption and Can you guide me how can i start
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ReferenceswolfSSL - Embedded SSL Library → wolfSSL → How to use AES GCM 128 algorithm
Hi,
I am new to AES GCM 128 algorithm .
I want to use the AES-GCM mode for encryption/decryption and Can you guide me how can i start
Hi harish.reddy,
We have a good AES CBC example here, which can be adopted to GCM:
https://github.com/wolfSSL/wolfssl-exam … -encrypt.c
Our AES GCM wolfCrypt test is here:
https://github.com/wolfSSL/wolfssl/blob … st.c#L7225
Thanks,
David Garske, wolfSSL
Hi,
https://github.com/wolfSSL/wolfssl/blob … st.c#L7225
We have tried above program but we are getting following error
[Error] wolfssl/version.h: No such file or directory
kindly suggest
Hi harish,
Where did you download wolfSSL from? Did it come from: https://www.wolfssl.com/download/ or somewhere else?
Warm Regards,
KH
Hi harish.reddy,
Can you also tell us a bit about the build environment you are using such as compiler, IDE and RTOS?
I'm guessing you are building the sources directly. Make sure you have added the wolfssl-root to your include path. All our code include references the root. `CFLAGS="-I<wolfssl-root>"`. For build configuration I recommend defining `WOLFSSL_USER_SETTINGS` and having your own `user_settings.h` file. You can find a good article for this here:https://www.wolfssl.com/how-do-i-manage-the-build-configuration-of-wolfssl/
Thanks,
David Garske, wolfSSL
Hi,
7E A0 38 41 00 02 04 01 96 4D 42 E6 E7 00 CC 27 30 00 00 07 06 A9 2A 14 EA 17 A1 18 FE 05 0A A8 47 3C 9C EC 3D B9 24 BE FF 82 80 94 04 0D EC DE 6A 2D C8 E6 7F FF 93 A2 25 7E
I want to decrypt above mentioned encrypted raw data
How can I identify TAG length and data
Hi harish.reddy,
There is not enough data there to determine that information. Typically the AES GCM IV is 12 bytes. Typically the AES GCM Auth Tag is 16 bytes. Typically the AES GCM Encrypted data is a multiple of block size (16 bytes).
https://github.com/wolfSSL/wolfssl/blob … aes.h#L110
Thanks,
David Garske, wolfSSL
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