EVP_MAX_BLOCK_LENGTH Macro for upgrading application from openssl 1.0.2 to openssl 3.0

[Matt Caswell]

On 11/08/2021 08:16, Paramashivaiah, Sunil wrote:
> Hi All,
> 
> In our application we are using  MD5_CBLOCK, SHA_CBLOCK, SHA256_CBLOCK, 
> SHA512_CBLOCK macros which are deprecated in openssl 3.0.
> 
>                We are trying upgrade our application from using openssl 
> 1.0.2 to openssl 3.0.
> 
>               Can we use EVP_MAX_BLOCK_LENGTH to replace all these 
> macros. Please suggest.

No, these things are not equivalent. EVP_MAX_BLOCK_LENGTH is referring 
to the block size for ciphers. Why do you need the block size for the 
digests?

You can query the block size for a given digest at runtime using 
EVP_MD_get_block_size().

Matt


> 
> Thanks and Regards,
> 
> Sunil
> 
> 
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