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Signature proving payment to destination by only revealing key derivation, not the actual tx secret key

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stoffu 2017-03-30 08:22:16 +09:00
parent 038e6cd33e
commit c9e0e944e9
No known key found for this signature in database
GPG key ID: 41DAB8343A9EC012
4 changed files with 359 additions and 15 deletions
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14
src/crypto/crypto.h
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@ -123,6 +123,10 @@ namespace crypto {
friend void generate_signature(const hash &, const public_key &, const secret_key &, signature &);
static bool check_signature(const hash &, const public_key &, const signature &);
friend bool check_signature(const hash &, const public_key &, const signature &);
static void generate_tx_proof(const hash &, const public_key &, const public_key &, const public_key &, const secret_key &, signature &);
friend void generate_tx_proof(const hash &, const public_key &, const public_key &, const public_key &, const secret_key &, signature &);
static bool check_tx_proof(const hash &, const public_key &, const public_key &, const public_key &, const signature &);
friend bool check_tx_proof(const hash &, const public_key &, const public_key &, const public_key &, const signature &);
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 &,
@ -200,6 +204,16 @@ namespace crypto {
return crypto_ops::check_signature(prefix_hash, pub, sig);
}
/* Generation and checking of a tx proof; given a tx pubkey R, the recipient's view pubkey A, and the key
* derivation D, the signature proves the knowledge of the tx secret key r such that R=r*G and D=r*A
*/
inline void generate_tx_proof(const hash &prefix_hash, const public_key &R, const public_key &A, const public_key &D, const secret_key &r, signature &sig) {
crypto_ops::generate_tx_proof(prefix_hash, R, A, D, r, sig);
}
inline bool check_tx_proof(const hash &prefix_hash, const public_key &R, const public_key &A, const public_key &D, const signature &sig) {
return crypto_ops::check_tx_proof(prefix_hash, R, A, D, sig);
}
/* 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.