• Registered: 2023-03-30
  • Posts: 1

Topic: public and private keys of size less than 72 bytes

I have the PFX file that currently generates the Digital signature, private key and public key. However, the generated RSA keys from the PFX files are 256 bytes in length.

I want to have the public and private keys of less than 72 bytes in size.

Is there any option that i can generate the keys(less than 72 bytes) using the PFX file. if this is not possible, please provide any alternate ways to achieve this objective.

is there a way to generate keys from PFX file using ECC instead of RSA?

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  • Registered: 2021-07-06
  • Posts: 102

Re: public and private keys of size less than 72 bytes

Hi akimoorthy,

Yes, you will definitely need ECC to achieve this size.  You will want to use 256-bit ECC to generate a public key less than 72 bytes in size.  Note that while the key itself will be smaller than 72 bytes, you are using a PFX file (PKCS#12) which will add some overhead.  For minimal size, consider using a DER file, which will only contain the key itself.

Here is a full example of how to generate an ECC keypair and export it to .der files: https://github.com/wolfSSL/wolfssl-exam … y-export.c

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