How to import 1024 bits RSA private key

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CatalinJuganaru-3997 asked May 5, '22 CatalinJuganaru-3997 commented May 13, '22

How to import 1024 bits RSA private key

Hi,

Please help me to import 1024 bits RSA Private Key with BCryptImportKey.
I need to make some encryption and decryption for tls authentications.
I spent some time on this issue, but with the existing documentation I can not solve it.
I generated keys, hashes, but I can't manage to import this 128-byte private key under any circumstances.
Please help me with a complete documentation of the necessary parameters or with an example.

Thank you very much.
Catalin

windows-api

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Answer 1 · 2022-05-06T01:34:26.913Z

XiaopoYang-MSFT answered May 6, '22 CatalinJuganaru-3997 commented May 13, '22

Perhaps you should use BCryptImportKeyPair with BCRYPT_RSAPRIVATE_BLOB. A quick search for a sample.

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CatalinJuganaru-3997 · May 07 at 03:11 PM

I managed to import a RSA private key with 2048 bits. Thank you very much.

I further sign a 32 byte hash and send it along with other data as a TLS1.3 packet.
If I sign with

BCRYPT_PKCS1_PADDING_INFO paddingInfo = {};
paddingInfo.pszAlgId = BCRYPT_SHA256_ALGORITHM;

I get what is in the picture: "last octet invalid : rsa_pss.c:94", etc, etc

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tls-error.png (49.7 KiB)

XiaopoYang-MSFT CatalinJuganaru-3997 · May 09 at 01:14 AM

Hello @CatalinJuganaru-3997 , Could you please show a minimal, reproducible sample without private information?

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