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| EVP_PKEY * | xmlSecOpenSSLKeyGetEvp () | 
| int | xmlSecOpenSSLEvpKeyDataAdoptEvp () | 
| EVP_PKEY * | xmlSecOpenSSLEvpKeyDataGetEvp () | 
| EVP_PKEY * | xmlSecOpenSSLEvpKeyDup () | 
| xmlSecKeyDataPtr | xmlSecOpenSSLEvpKeyAdopt () | 
| xmlSecKeyDataId | xmlSecOpenSSLKeyDataDEREncodedKeyValueGetKlass () | 
EVP_PKEY *
xmlSecOpenSSLKeyGetEvp (xmlSecKeyPtr key);
Gets the EVP_PKEY from the key.
int xmlSecOpenSSLEvpKeyDataAdoptEvp (xmlSecKeyDataPtr data,EVP_PKEY *pKey);
Sets the value of key data.
EVP_PKEY *
xmlSecOpenSSLEvpKeyDataGetEvp (xmlSecKeyDataPtr data);
Gets the EVP_PKEY from the key data.
xmlSecKeyDataPtr
xmlSecOpenSSLEvpKeyAdopt (EVP_PKEY *pKey);
Creates xmlsec key object from OpenSSL key object.
xmlSecKeyDataId
xmlSecOpenSSLKeyDataDEREncodedKeyValueGetKlass
                               (void);
https://www.w3.org/TR/xmldsig-core1/sec-DEREncodedKeyValue
<element></element><complexType> <simpleContent> <extension> <attribute></attribute> </extension> </simpleContent> </complexType>