How to perform digital signature verification with Debian OpenSSL-Linux Operation and Maintenance-php.cn

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How to perform digital signature verification with Debian OpenSSL

Michael Jordan

Apr 13, 2025 am 11:09 AM

Using OpenSSL for digital signature verification on Debian systems, you can follow these steps:

Preparation

Install OpenSSL : Make sure your Debian system has OpenSSL installed. If not installed, you can use the following command to install:
```
 sudo apt update
sudo apt install openssl
```
Obtaining the public key : Digital signature verification requires the signer's public key. Typically, the public key will be provided in the form of a file, such as public_key.pem.
Get the signature file and the original data file :
- Signature file: usually in .sig or .pem format.
- Original data file: This is the signed data file, such as data.txt.

Verification steps

The command to use OpenSSL for digital signature verification is as follows:

 openssl dgst -sha256 -verify public_key.pem -signature signature_file.sig data_file.txt

explain:

-sha256: Specify the hashing algorithm used, here SHA-256 is used.
-verify public_key.pem: Specify the signer's public key file.
-signature signature_file.sig: Specify the signature file.
data_file.txt: Specifies the signed original data file.

Example

Suppose you have the following files:

public_key.pem: The signer's public key file.
signature.sig: Signature file.
data.txt: The signed data file.

Run the following command to verify:

 openssl dgst -sha256 -verify public_key.pem -signature signature.sig data.txt

Output result

If the verification is successful, OpenSSL will output:

 Verified OK

If verification fails, OpenSSL will output:

 Verification Failure

Things to note

Hash algorithm : Ensure that the hash algorithm used when signing is consistent with the hash algorithm used when verifying.
Public Key File : Make sure that the public key file is correct and matches the signer.
File path : Make sure all file paths are correct.

Through the above steps, you can use OpenSSL for digital signature verification on Debian system.

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