I have certificate and ECDSA (on p-256) signature. Now i want to verify this signature using provided certificate. I use c++ (on Windows). Managed code (.NET) can't be used. I found that CryptoAPI doesn'r support ECDSA, so i should use CryptoAPI NG (CNG). However i can't find how to import public key from certificate to the CNG.
Can you help with my problem? Thanks
Issue was solved. I use OpenSSL for this purpose.
"The CryptImportPublicKeyInfoEx2 function imports a public key into the CNG asymmetric provider..."
My C may be a bit off, but I believe it to be something like
BCRYPT_KEY_HANDLE hKey;
BOOL imported = CryptImportPublicKeyInfoEx2(
X509_ASN_ENCODING,
&(pCertContext->pCertInfo->SubjectPublicKeyInfo),
0,
NULL,
&hKey);
if (!imported)
goto :err;
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