CertGetPublicKeyLength function (wincrypt.h)
The CertGetPublicKeyLength function acquires the bit length of public/private keys from a public key BLOB.
Syntax
DWORD CertGetPublicKeyLength(
[in] DWORD dwCertEncodingType,
[in] PCERT_PUBLIC_KEY_INFO pPublicKey
);
Parameters
[in] dwCertEncodingType
Specifies the encoding type used. It is always acceptable to specify both the certificate and message encoding types by combining them with a bitwise-OR operation as shown in the following example:
X509_ASN_ENCODING | PKCS_7_ASN_ENCODING Currently defined encoding types are:
- X509_ASN_ENCODING
- PKCS_7_ASN_ENCODING
[in] pPublicKey
A pointer to the public key BLOB containing the keys for which the length is being retrieved.
Return value
Returns the length of the public/private keys in bits. If unable to determine the key's length, returns zero.
Call GetLastError to see the reason for any failures.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows XP [desktop apps | UWP apps] |
| Minimum supported server | Windows Server 2003 [desktop apps | UWP apps] |
| Target Platform | Windows |
| Header | wincrypt.h |
| Library | Crypt32.lib |
| DLL | Crypt32.dll |