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<body class='hmmessage'><div dir='ltr'>OpenSSL has the higher-level <code>EVP_PKEY_*</code> functions which work abstracts the public key cryptography algorithms. However, sometimes a <code>EVP_PKEY*</code> only has a public key. How could I check if a given <code>EVP_PKEY*</code> contains a private key? I could use <code>EVP_PKEY_decrypt_init</code> and see if it returns an error, but that seems to be quite heavy-handed for what seems to be a simple check. The other option is to go through the EVP_PKEY_get0_* functions and investigate the underlying mechanism directly (e.g. <font style="" face="Courier New,sans-serif"><u>EVP_PKEY_get0_RSA</u></font> and checking the<font style="" face="Courier New,sans-serif"> RSA*</font>'s private exponent is <font style="" face="Courier New,sans-serif">NULL</font>), but that is also clumsy as I'll have to write code for every possible algorithm.<br><br>Thanks<br>Stephen<br> </div></body>
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