fourdst::crypt Namespace Reference

Namespaces
namespace	utils

Classes
struct	EVP_MD_CTX_Deleter
struct	EVP_PKEY_Deleter
	Custom deleter for OpenSSL EVP_PKEY objects. More...
class	PublicKey
	Represents a public key for cryptographic operations. More...

Typedefs
using	Unique_EVP_PKEY = std::unique_ptr<EVP_PKEY, EVP_PKEY_Deleter>
	Unique pointer type for managing EVP_PKEY objects with automatic cleanup.

Functions
bool	verify_signature (const PublicKey &key, const std::vector< unsigned char > &data_to_verify, const std::vector< unsigned char > &signature)
	Verifies a digital signature against given data using the provided public key.

Typedef Documentation

Unique_EVP_PKEY

using fourdst::crypt::Unique_EVP_PKEY = std::unique_ptr<EVP_PKEY, EVP_PKEY_Deleter>

Unique pointer type for managing EVP_PKEY objects with automatic cleanup.

Function Documentation

verify_signature()

bool fourdst::crypt::verify_signature	(	const PublicKey &	key,
		const std::vector< unsigned char > &	data_to_verify,
		const std::vector< unsigned char > &	signature )

Verifies a digital signature against given data using the provided public key.

This function verifies that the signature was created by the private key corresponding to the provided public key and that the data has not been tampered with.

Parameters

[in]	key	The public key to use for verification.
[in]	data_to_verify	The data that was signed.
[in]	signature	The signature to verify.

Returns

bool True if the signature is valid, false otherwise.

Exceptions

std::runtime_error

If: The public key is invalid or null. Memory allocation for the verification context fails. The verification context cannot be initialized. An error occurs during the verification process.

Note

The function uses the default digest and padding scheme appropriate for the key type.

Example

try {
    fourdst::crypt::PublicKey pubKey("public_key.pem");
    std::vector<unsigned char> data = {'t', 'e', 's', 't'};
    std::vector<unsigned char> signature = get_signature(); // Get signature from somewhere
    
    if (fourdst::crypt::verify_signature(pubKey, data, signature)) {
        std::cout << "Signature is valid" << std::endl;
    } else {
        std::cout << "Signature is invalid" << std::endl;
    }
} catch (const std::exception& e) {
    std::cerr << "Error: " << e.what() << std::endl;
}