<Replacement for RSA_public_decrypt>

Fri Jan 29 12:16:58 UTC 2021

Yeah, it sounds correct. But since it’s an old application code & we are not sure why was it done so, we are little worried to change.
Can you please take a look the attachment which has the complete flow, and provide your views which helps us to change it to  PEM_read_PrivateKey() or variants as you suggested

Regards,
Sunil

From: Thulasi Goriparthi <thulasi.goriparthi at gmail.com>
Sent: 29 January 2021 17:24
To: Narayana, Sunil Kumar <sanarayana at rbbn.com>
Cc: openssl-users at openssl.org
Subject: Re: <Replacement for RSA_public_decrypt>

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Isn't it obvious to use PEM_read_PrivateKey() or variants to load the private key as EVP_PKEY
and use EVP_PKEY_decrypt* as specified in https://www.openssl.org/docs/man1.0.2/man3/EVP_PKEY_decrypt.html<https://protect-us.mimecast.com/s/pIHaCqx23xSzZMNwiZOok8?domain=openssl.org> ?

Thanks,
Thulasi.

On Fri, 29 Jan 2021 at 16:59, Narayana, Sunil Kumar <sanarayana at rbbn.com<mailto:sanarayana at rbbn.com>> wrote:
Hi Thulasi,

Currently in (1.0.1) we are following the following sequence, which now need to replace with EVP.

Current sequence

//to create RSA pubkey
rsa = PEM_read_bio_RSA_PUBKEY(keybio, NULL, NULL, NULL);  // !!!

//to decrypt using RSA utility
RSA_public_decrypt(len, (unsigned char*)buffer,decrypted,rsa, RSA_PKCS1_PADDING) ;

As you mentioned , if we use PEM_read_bio_PUBKEY to get EVP_PKEY, it will be a pubkey right ? but in order to decrypt as per the example in https://www.openssl.org/docs/manmaster/man3/EVP_PKEY_decrypt_init.html<https://protect-us.mimecast.com/s/iJORCrkY3ki1EBZJTzdO87?domain=openssl.org>
We need to use an RSA private key

Please suggest.

Regards,
Sunil
From: Thulasi Goriparthi <thulasi.goriparthi at gmail.com<mailto:thulasi.goriparthi at gmail.com>>
Sent: 29 January 2021 13:07
To: Narayana, Sunil Kumar <sanarayana at rbbn.com<mailto:sanarayana at rbbn.com>>
Cc: openssl-users at openssl.org<mailto:openssl-users at openssl.org>
Subject: Re: <Replacement for RSA_public_decrypt>

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NOTICE: This email was received from an EXTERNAL sender
________________________________

Hope, you are referring to https://www.openssl.org/docs/man1.0.2/man3/EVP_PKEY_encrypt.html<https://protect-us.mimecast.com/s/v2osCv2j32i2xk8Vtz2d4K?domain=openssl.org>

Use PEM_read_bio_PUBKEY to get EVP_PKEY.
eng is for engine reference. If you have no engine, it can be NULL.

Thanks,
Thulasi.

On Fri, 29 Jan 2021 at 10:13, Narayana, Sunil Kumar <sanarayana at rbbn.com<mailto:sanarayana at rbbn.com>> wrote:
Dear Openssl team,

                While migrating from 1.0.2 to 3.0 we observe that RSA_public_decrypt() API been deprecated in 3.0.
We referred the example provided in man page but we are not clear in generating the initial ‘key’ required to create CTX.
Please suggest on (key , eng) params to proceed

Also currently we are using PEM_read_bio_RSA_PUBKEY() to generate RSA, I think this might not require in case of EVP, please suggest.

/*
  * NB: assumes key, eng, in, inlen are already set up
  * and that key is an RSA private key
  */
ctx = EVP_PKEY_CTX_new(key, eng);

Regards,
Sunil

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