The private key is stored in private. For security reason, I suggest to use bits for the keys, you can read the reason in this blog post. When you have the private and public key you can use OpenSSL to sign the file. The default output format of the OpenSSL signature is binary. If you need to share the signature over internet you cannot use a binary format. You can use for instance Base64 format for file exchange.
You can use the following commands to generate the signature of a file and convert it in Base64 format:. To sign a data file data. More information about the command can be found from its man page. The -sign argument tells OpeSSL to sign the calculated digest using the provided private key.
The hash function is selected with -sha argument. Other hash functions can be used in its place e. The output is written to data.
The digital signature can also be verified using the same openssl dgst command. Obviously this step is performed on the receivers end. The -verify argument tells OpenSSL to verify signature using the provided public key.
The signature file is provided using -signature argument. It is also possible to calculate the digest and signature separately. This can be useful if the signature is calculated on a different machine where the data file is generated e. This way the whole data file does not need to be moved to the signing machine. The pkeyutl command does not know which hashing algorithm was used because it only gets the generated digest as input.
Therefore -pkeyopt argument is used to tell which algorithm was used, so it can be properly marked in the signature for verify operation. Otherwise the arguments should be fairly self-explanatory. More information from the man page. If the OpenSSL command line utilities are not available for instance in an embedded environment, the signature can also be verified quite easily using C and libssl library. First, the OpenSSL headers should be installed:. The following listing shows an implementation for a command line application that takes data file, signature file and public key as arguments, and verifies the signature.
Note that all error handling has been omitted e. The application needs to be linked with crypto library which provides the necessary interfaces.
The application first calculates SHA digest from the data file. Then, both the signature and public key are read from files. Digital signatures provide a strong cryptographic scheme to validate integrity and authenticity of data and are therefore useful in various use cases. OpenSSL provides easy command line utilities to both sign and verify documents.
Additionally the libcrypto can be used to perform these operations from a C application. Special care should be taken when handling the private keys especially in a production environment because the whole scheme relies on the senders private key being kept secret.
You are commenting using your WordPress. You are commenting using your Google account. You are commenting using your Twitter account. I'm assuming, if it can be done in Java then it can be done in C. The problem is that I'm not getting the same results as I got with the original tool. As far as I can tell from reading the code the CryptoServiceProvider that does the actual signing is not using the PrivateKey from key store file.
Is that Correct? Your later example may not work all the time, it should use the hash algorithm's OID, rather than it's name. As per your first example, this is obtained from a call to CryptoConfig. First you are going to need is the certificate with the private key. I normally read mine from the LocalMachine or CurrentUser store by using a public key file.
However you get there, once you've obtained a certificate with a private key we need to reconstruct it. This may be required due to the way the certificate creates it's private key, but I'm not really sure why.
Anyway, we do this by first exporting the key and then re-importing it using whatever intermediate format you like, the easiest is xml:. Lastly, the verification can be done directly with the certificate's public key without need for the reconstruction as we did with the private key:. The use of privateKey. I settled on changing the key file to specify the appropriate Crypto Service Provider , avoiding the issue in.
NET altogether. You may need to tweak this for the file formats you have on hand. So, you can create your certificate with an additional option: -sp "Microsoft Enhanced RSA and AES Cryptographic Provider" or an equivalent -sy 24 and then your code would work without the key juggling stuff. The signingCertificate above is a XCertificate2 with a private key. This method does not require you to import any existing keys and works in a secure environment. According to this blog it should work with FX 3.
However it's important to recall that most of. That seems to work for some people, YMMV. Note: this is confusing to many people because all the released. FWIW Mono does not suffer from such issues ;-. I know this is an old thread but for those still stuck in the past and looking for an answer, the following worked for me based off BKibler's answer. The comments stated it's not using the correct key and it's because the solution is missing a couple key settings.
You need to set both "KeyNumber" and "Flags" so the existing non-exportable key is used and you can use the public key from the certificate to verify. I have noticed similar issues in.
NET with the wrong private key being used or was it flat-out errors? Installing it into the stored fixed the problem for my scenario and things started working as expected - perhaps you can try that. How are we doing? Please help us improve Stack Overflow. Take our short survey. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Ask Question. Asked 10 years, 4 months ago. Active 7 months ago.
Viewed k times. SignData File. KeyContainerName; cspParam. VerifyData File. Improve this question.
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