Botan
1.11.15
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Functions | |
void | decode (BER_Decoder &source, Key_Constraints &key_usage) |
BER Decoding Function for key constraints
void BOTAN_DLL Botan::BER::decode | ( | BER_Decoder & | source, |
Key_Constraints & | key_usage | ||
) |
Definition at line 19 of file key_constraint.cpp.
References Botan::BIT_STRING, Botan::BER_Object::class_tag, Botan::BER_Decoder::get_next_object(), Botan::BER_Object::type_tag, Botan::UNIVERSAL, and Botan::BER_Object::value.
Referenced by Botan::OCSP::CertID::CertID(), Botan::TLS::Client_Key_Exchange::Client_Key_Exchange(), Botan::BigInt::decode(), Botan::BER_Decoder::decode_and_check(), Botan::BER_Decoder::decode_optional_string(), Botan::IF_Scheme_PrivateKey::IF_Scheme_PrivateKey(), Botan::TLS::Server_Key_Exchange::Server_Key_Exchange(), and Botan::SRP6_Authenticator_File::SRP6_Authenticator_File().
{ BER_Object obj = source.get_next_object(); if(obj.type_tag != BIT_STRING || obj.class_tag != UNIVERSAL) throw BER_Bad_Tag("Bad tag for usage constraint", obj.type_tag, obj.class_tag); if(obj.value.size() != 2 && obj.value.size() != 3) throw BER_Decoding_Error("Bad size for BITSTRING in usage constraint"); if(obj.value[0] >= 8) throw BER_Decoding_Error("Invalid unused bits in usage constraint"); const byte mask = (0xFF << obj.value[0]); obj.value[obj.value.size()-1] &= mask; u16bit usage = 0; for(size_t j = 1; j != obj.value.size(); ++j) usage = (obj.value[j] << 8) | usage; key_usage = Key_Constraints(usage); }