How is the AES CTR encryption working in openssl EVP api

[ajay saxena <aileronajay@xxxxxxxxx>]

Hi,

I am trying to use AES CTR encryption to encrypt/decrypt data using EVP API. The earlier API, AES_ctr128_encrypt does explicitly use a counter. How is the counter handled in the EVP implmentation. 

I followed this documentation here, https://wiki.openssl.org/index.php/EVP_Symmetric_Encryption_and_Decryption

and replaced the cbc with ctr function. Can someone please help me understand the usage of AES CTR encryption using EVP api.

Thanks,

Ajay

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