63 lines
1.3 KiB
C++
63 lines
1.3 KiB
C++
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#include <cstddef>
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#include <cstdint>
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namespace axolotl {
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/**
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* The length of the buffer needed to hold a message.
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*/
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std::size_t encode_message_length(
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std::uint32_t counter,
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std::size_t ratchet_key_length,
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std::size_t ciphertext_length,
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std::size_t mac_length
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);
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struct MessageWriter {
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std::size_t body_length;
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std::uint8_t * ratchet_key;
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std::uint8_t * ciphertext;
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std::uint8_t * mac;
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};
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struct MessageReader {
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std::size_t body_length;
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std::uint8_t version;
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std::uint32_t counter;
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std::size_t ratchet_key_length;
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std::size_t ciphertext_length;
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std::uint8_t const * ratchet_key;
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std::uint8_t const * ciphertext;
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std::uint8_t const * mac;
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};
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/**
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* Writes the message headers into the output buffer.
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* Returns a writer struct populated with pointers into the output buffer.
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*/
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MessageWriter encode_message(
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std::uint8_t version,
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std::uint32_t counter,
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std::size_t ratchet_key_length,
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std::size_t ciphertext_length,
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std::uint8_t * output
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);
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/**
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* Reads the message headers from the input buffer.
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* Returns a reader struct populated with pointers into the input buffer.
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* On failure the returned body_length will be 0.
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*/
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MessageReader decode_message(
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std::uint8_t const * input, std::size_t input_length,
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std::size_t mac_length
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);
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} // namespace axolotl
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