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.goripar...@gmail.com>
Sent: 29 January 2021 17:24
To: Narayana, Sunil Kumar <sanaray...@rbbn.com>
Cc: openssl-users@openssl.org
Subject: Re: <Replacement for RSA_public_decrypt>
________________________________
NOTICE: This email was received from an EXTERNAL sender
________________________________
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
<sanaray...@rbbn.com<mailto:sanaray...@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.goripar...@gmail.com<mailto:thulasi.goripar...@gmail.com>>
Sent: 29 January 2021 13:07
To: Narayana, Sunil Kumar <sanaray...@rbbn.com<mailto:sanaray...@rbbn.com>>
Cc: openssl-users@openssl.org<mailto:openssl-users@openssl.org>
Subject: Re: <Replacement for RSA_public_decrypt>
________________________________
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
<sanaray...@rbbn.com<mailto:sanaray...@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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bool DecryptSignature( string publicKey, string signature, string &
keyDecrypted)
{
ostringstream pem;
pem << "-----BEGIN PUBLIC KEY-----" << endl;
while (publicKey.length() > 64)
{
pem << publicKey.substr(0,64) << endl;
publicKey.erase(0,64);
}
if ( !publicKey.empty() )
{
pem << publicKey << endl;
}
pem << "-----END PUBLIC KEY-----" << endl;
RSA* rsa= CreateRSAPubKey(pem.str().c_str() );
if ( rsa == NULL )
{
return false;
}
char *buffer;
uint32 len;
Base64Decode(signature, &buffer, &len );
int32 decryptedLen=RSA_size(rsa);
unsigned char decrypted[decryptedLen+1];
int retlen = RSA_public_decrypt(len, (unsigned char*)buffer,decrypted,rsa,
RSA_PKCS1_PADDING) ;
RSA_free(rsa);
free(buffer);
if ( retlen > 0 )
{
//lint -e{571} Suspicious cast - decrypted contains ascii bytes
representation of hash of signature
keyDecrypted=string((char*)decrypted, (size_t) retlen );
return true;
}
else
{
return false;
}
}
RSA* CreateRSAPubKey(const char* key)
{
RSA *rsa = NULL;
BIO *keybio ;
keybio = BIO_new_mem_buf((void*)key, -1); // !!!
if (!keybio)
{
return NULL;
}
rsa = PEM_read_bio_RSA_PUBKEY(keybio, NULL, NULL, NULL); // !!!
if(!rsa )
{
return NULL;
}
BIO_free(keybio); // !!!
return rsa;
}
