39 lines
1.5 KiB
C++
39 lines
1.5 KiB
C++
#pragma once
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#include <array>
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#include <string>
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#include <string_view>
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namespace session::xed25519 {
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using ustring_view = std::basic_string_view<unsigned char>;
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/// XEd25519-signs a message given the curve25519 privkey and message.
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std::array<unsigned char, 64> sign(
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ustring_view curve25519_privkey /* 32 bytes */, ustring_view msg);
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/// "Softer" version that takes and returns strings of regular chars
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std::string sign(std::string_view curve25519_privkey /* 32 bytes */, std::string_view msg);
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/// Verifies a curve25519 message allegedly signed by the given curve25519 pubkey
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[[nodiscard]] bool verify(
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ustring_view signature /* 64 bytes */,
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ustring_view curve25519_pubkey /* 32 bytes */,
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ustring_view msg);
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/// "Softer" version that takes strings of regular chars
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[[nodiscard]] bool verify(
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std::string_view signature /* 64 bytes */,
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std::string_view curve25519_pubkey /* 32 bytes */,
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std::string_view msg);
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/// Given a curve25519 pubkey, this returns the associated XEd25519-derived Ed25519 pubkey. Note,
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/// however, that there are *two* possible Ed25519 pubkeys that could result in a given curve25519
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/// pubkey: this always returns the positive value. You can get the other possibility (the
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/// negative) by flipping the sign bit, i.e. `returned_pubkey[31] |= 0x80`.
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std::array<unsigned char, 32> pubkey(ustring_view curve25519_pubkey);
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/// "Softer" version that takes/returns strings of regular chars
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std::string pubkey(std::string_view curve25519_pubkey);
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} // namespace session::xed25519
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