Remove hardcoded library functions in ConfidentialTransfer (#6365)

include/xrpl/protocol/ConfidentialTransfer.h

@@ -13,7 +13,7 @@
 #include <xrpl/protocol/TxFormats.h>
 #include <xrpl/protocol/detail/secp256k1.h>
 
-#include <secp256k1.h>
+#include <secp256k1_mpt.h>
 
 namespace xrpl {
 
@@ -438,291 +438,6 @@ verifyBalancePcmLinkage(
     Slice const& pcmSlice,
     uint256 const& contextHash);
 
-// The following functions belong to the mpt-crypto library,
-// they will be finally removed and we will use conan2 to manage the dependency.
-/**
- * @brief Generates a new secp256k1 key pair.
- */
-SECP256K1_API int
-secp256k1_elgamal_generate_keypair(secp256k1_context const* ctx, unsigned char* privkey, secp256k1_pubkey* pubkey);
-
-/**
- * @brief Encrypts a 64-bit amount using ElGamal.
- */
-SECP256K1_API int
-secp256k1_elgamal_encrypt(
-    secp256k1_context const* ctx,
-    secp256k1_pubkey* c1,
-    secp256k1_pubkey* c2,
-    secp256k1_pubkey const* pubkey_Q,
-    uint64_t amount,
-    unsigned char const* blinding_factor);
-
-/**
- * @brief Decrypts an ElGamal ciphertext to recover the amount.
- */
-SECP256K1_API int
-secp256k1_elgamal_decrypt(
-    secp256k1_context const* ctx,
-    uint64_t* amount,
-    secp256k1_pubkey const* c1,
-    secp256k1_pubkey const* c2,
-    unsigned char const* privkey);
-
-/**
- * @brief Homomorphically adds two ElGamal ciphertexts.
- */
-SECP256K1_API int
-secp256k1_elgamal_add(
-    secp256k1_context const* ctx,
-    secp256k1_pubkey* sum_c1,
-    secp256k1_pubkey* sum_c2,
-    secp256k1_pubkey const* a_c1,
-    secp256k1_pubkey const* a_c2,
-    secp256k1_pubkey const* b_c1,
-    secp256k1_pubkey const* b_c2);
-
-/**
- * @brief Homomorphically subtracts two ElGamal ciphertexts.
- */
-SECP256K1_API int
-secp256k1_elgamal_subtract(
-    secp256k1_context const* ctx,
-    secp256k1_pubkey* diff_c1,
-    secp256k1_pubkey* diff_c2,
-    secp256k1_pubkey const* a_c1,
-    secp256k1_pubkey const* a_c2,
-    secp256k1_pubkey const* b_c1,
-    secp256k1_pubkey const* b_c2);
-
-/**
- * @brief Generates the canonical encrypted zero for a given MPT token instance.
- *
- * This ciphertext represents a zero balance for a specific account's holding
- * of a token defined by its MPTokenIssuanceID.
- *
- * @param[in]   ctx             A pointer to a valid secp256k1 context.
- * @param[out]  enc_zero_c1     The C1 component of the canonical ciphertext.
- * @param[out]  enc_zero_c2     The C2 component of the canonical ciphertext.
- * @param[in]   pubkey          The ElGamal public key of the account holder.
- * @param[in]   account_id      A pointer to the 20-byte AccountID.
- * @param[in]   mpt_issuance_id A pointer to the 24-byte MPTokenIssuanceID.
- *
- * @return 1 on success, 0 on failure.
- */
-SECP256K1_API int
-generate_canonical_encrypted_zero(
-    secp256k1_context const* ctx,
-    secp256k1_pubkey* enc_zero_c1,
-    secp256k1_pubkey* enc_zero_c2,
-    secp256k1_pubkey const* pubkey,
-    unsigned char const* account_id,      // 20 bytes
-    unsigned char const* mpt_issuance_id  // 24 bytes
-);
-
-/**
- * Generates a cryptographically secure 32-byte scalar (private key).
- * @return 1 on success, 0 on failure.
- */
-SECP256K1_API int
-generate_random_scalar(secp256k1_context const* ctx, unsigned char* scalar_bytes);
-
-/**
- * Computes the point M = amount * G.
- * IMPORTANT: This function MUST NOT be called with amount = 0.
- */
-SECP256K1_API int
-compute_amount_point(secp256k1_context const* ctx, secp256k1_pubkey* mG, uint64_t amount);
-
-/**
- * Builds the challenge hash input for the NON-ZERO amount case.
- * Output buffer must be 253 bytes.
- */
-SECP256K1_API void
-build_challenge_hash_input_nonzero(
-    unsigned char* hash_input,
-    secp256k1_pubkey const* c1,
-    secp256k1_pubkey const* c2,
-    secp256k1_pubkey const* pk,
-    secp256k1_pubkey const* mG,
-    secp256k1_pubkey const* T1,
-    secp256k1_pubkey const* T2,
-    unsigned char const* tx_context_id);
-
-/**
- * Builds the challenge hash input for the ZERO amount case.
- * Output buffer must be 220 bytes.
- */
-SECP256K1_API void
-build_challenge_hash_input_zero(
-    unsigned char* hash_input,
-    secp256k1_pubkey const* c1,
-    secp256k1_pubkey const* c2,
-    secp256k1_pubkey const* pk,
-    secp256k1_pubkey const* T1,
-    secp256k1_pubkey const* T2,
-    unsigned char const* tx_context_id);
-
-/**
- * @brief Proves that a commitment (C1, C2) encrypts a specific plaintext
- * 'amount'.
- */
-SECP256K1_API int
-secp256k1_equality_plaintext_prove(
-    secp256k1_context const* ctx,
-    unsigned char* proof,
-    secp256k1_pubkey const* c1,
-    secp256k1_pubkey const* c2,
-    secp256k1_pubkey const* pk_recipient,
-    uint64_t amount,
-    unsigned char const* randomness_r,
-    unsigned char const* tx_context_id);
-
-/**
- * @brief Verifies the proof generated by secp256k1_equality_plaintext_prove.
- */
-SECP256K1_API int
-secp256k1_equality_plaintext_verify(
-    secp256k1_context const* ctx,
-    unsigned char const* proof,
-    secp256k1_pubkey const* c1,
-    secp256k1_pubkey const* c2,
-    secp256k1_pubkey const* pk_recipient,
-    uint64_t amount,
-    unsigned char const* tx_context_id);
-
-void
-build_pok_challenge(
-    unsigned char* e,
-    secp256k1_context const* ctx,
-    secp256k1_pubkey const* pk,
-    secp256k1_pubkey const* T,
-    unsigned char const* context_id);
-
-/** Proof of Knowledge of Secret Key for Registration */
-int
-secp256k1_mpt_pok_sk_prove(
-    secp256k1_context const* ctx,
-    unsigned char* proof, /* Expected size: 65 bytes */
-    secp256k1_pubkey const* pk,
-    unsigned char const* sk,
-    unsigned char const* context_id);
-
-int
-secp256k1_mpt_pok_sk_verify(
-    secp256k1_context const* ctx,
-    unsigned char const* proof, /* Expected size: 65 bytes */
-    secp256k1_pubkey const* pk,
-    unsigned char const* context_id);
-
-/**
- * Verifies that (c1, c2) is a valid ElGamal encryption of 'amount'
- * for 'pubkey_Q' using the revealed 'blinding_factor'.
- */
-int
-secp256k1_elgamal_verify_encryption(
-    secp256k1_context const* ctx,
-    secp256k1_pubkey const* c1,
-    secp256k1_pubkey const* c2,
-    secp256k1_pubkey const* pubkey_Q,
-    uint64_t amount,
-    unsigned char const* blinding_factor);
-
-/**
- * @brief Proves the link between an ElGamal ciphertext and a Pedersen
- * commitment.
- * * Formal Statement: Knowledge of (m, r, rho) such that:
- * C1 = r*G, C2 = m*G + r*Pk, and PCm = m*G + rho*H.
- * * @param ctx         Pointer to a secp256k1 context object.
- * @param proof       [OUT] Pointer to 195-byte buffer for the proof output.
- * @param c1          Pointer to the ElGamal C1 point (r*G).
- * @param c2          Pointer to the ElGamal C2 point (m*G + r*Pk).
- * @param pk          Pointer to the recipient's public key.
- * @param pcm         Pointer to the Pedersen Commitment (m*G + rho*H).
- * @param amount      The plaintext amount (m).
- * @param r           The 32-byte secret ElGamal blinding factor.
- * @param rho         The 32-byte secret Pedersen blinding factor.
- * @param context_id  32-byte unique transaction context identifier.
- * @return 1 on success, 0 on failure.
- */
-int
-secp256k1_elgamal_pedersen_link_prove(
-    secp256k1_context const* ctx,
-    unsigned char* proof,
-    secp256k1_pubkey const* c1,
-    secp256k1_pubkey const* c2,
-    secp256k1_pubkey const* pk,
-    secp256k1_pubkey const* pcm,
-    uint64_t amount,
-    unsigned char const* r,
-    unsigned char const* rho,
-    unsigned char const* context_id);
-
-/**
- * @brief Verifies the link proof between ElGamal and Pedersen commitments.
- * * @return 1 if the proof is valid, 0 otherwise.
- */
-int
-secp256k1_elgamal_pedersen_link_verify(
-    secp256k1_context const* ctx,
-    unsigned char const* proof,
-    secp256k1_pubkey const* c1,
-    secp256k1_pubkey const* c2,
-    secp256k1_pubkey const* pk,
-    secp256k1_pubkey const* pcm,
-    unsigned char const* context_id);
-
-/**
- * Compute a Pedersen Commitment: PC = m*G + rho*H
- * Returns 1 on success, 0 on failure.
- */
-int
-secp256k1_mpt_pedersen_commit(
-    secp256k1_context const* ctx,
-    secp256k1_pubkey* commitment,
-    uint64_t amount,
-    unsigned char const* blinding_factor_rho /* 32 bytes */
-);
-
-// Multi-proof for same plaintexts
-void
-build_hash_input(
-    unsigned char* hash_out,  // Output: 32-byte hash
-    size_t n,
-    secp256k1_pubkey const* R,
-    secp256k1_pubkey const* S,
-    secp256k1_pubkey const* Pk,
-    secp256k1_pubkey const* T_m,
-    secp256k1_pubkey const* T_rG,
-    secp256k1_pubkey const* T_rP,
-    unsigned char const* tx_id);
-
-size_t
-secp256k1_mpt_prove_same_plaintext_multi_size(size_t n);
-
-int
-secp256k1_mpt_prove_same_plaintext_multi(
-    secp256k1_context const* ctx,
-    unsigned char* proof_out,
-    size_t* proof_len,
-    uint64_t amount_m,
-    size_t n,
-    secp256k1_pubkey const* R,
-    secp256k1_pubkey const* S,
-    secp256k1_pubkey const* Pk,
-    unsigned char const* r_array,
-    unsigned char const* tx_id);
-
-int
-secp256k1_mpt_verify_same_plaintext_multi(
-    secp256k1_context const* ctx,
-    unsigned char const* proof,
-    size_t proof_len,
-    size_t n,
-    secp256k1_pubkey const* R,
-    secp256k1_pubkey const* S,
-    secp256k1_pubkey const* Pk,
-    unsigned char const* tx_id);
 }  // namespace xrpl
 
 #endif