22 #ifndef NDN_SECURITY_DIGEST_SHA256_HPP    23 #define NDN_SECURITY_DIGEST_SHA256_HPP    50 #endif // NDN_SECURITY_DIGEST_SHA256_HPP 
DigestSha256()
Create empty DigestSha256 signature. 
Represents a signature of DigestSha256 type. 
Holds SignatureInfo and SignatureValue in a Data packet.