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crypto: derive key image generator #10133

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crypto: derive key image generator #10133

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6 changes: 6 additions & 0 deletions src/crypto/crypto.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -618,6 +618,12 @@ namespace crypto {
ge_p1p1_to_p3(&res, &point2);
}

void crypto_ops::derive_key_image_generator(const public_key &pub, ec_point &ki_gen) {
ge_p3 point;
hash_to_ec(pub, point);
ge_p3_tobytes(&ki_gen, &point);
}

void crypto_ops::generate_key_image(const public_key &pub, const secret_key &sec, key_image &image) {
ge_p3 point;
ge_p2 point2;
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6 changes: 6 additions & 0 deletions src/crypto/crypto.h
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Expand Up @@ -129,6 +129,8 @@ namespace crypto {
friend void generate_tx_proof_v1(const hash &, const public_key &, const public_key &, const boost::optional<public_key> &, const public_key &, const secret_key &, signature &);
static bool check_tx_proof(const hash &, const public_key &, const public_key &, const boost::optional<public_key> &, const public_key &, const signature &, const int);
friend bool check_tx_proof(const hash &, const public_key &, const public_key &, const boost::optional<public_key> &, const public_key &, const signature &, const int);
static void derive_key_image_generator(const public_key &, ec_point &);
friend void derive_key_image_generator(const public_key &, ec_point &);
static void generate_key_image(const public_key &, const secret_key &, key_image &);
friend void generate_key_image(const public_key &, const secret_key &, key_image &);
static void generate_ring_signature(const hash &, const key_image &,
Expand Down Expand Up @@ -254,6 +256,10 @@ namespace crypto {
return crypto_ops::check_tx_proof(prefix_hash, R, A, B, D, sig, version);
}

inline void derive_key_image_generator(const public_key &pub, ec_point &ki_gen) {
crypto_ops::derive_key_image_generator(pub, ki_gen);
}

/* To send money to a key:
* * The sender generates an ephemeral key and includes it in transaction output.
* * To spend the money, the receiver generates a key image from it.
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