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feat(clients/js): add confidential mint/burn instruction plan helpers #1357

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feat(clients/js): add confidential mint/burn instruction plan helpers #1357

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f4da156
feat(clients/js): add confidential mint/burn instruction plan helpers
eldarik Jul 28, 2026
43f8c74
feat(clients/js): add permissioned confidential burn instruction plan
eldarik Jul 28, 2026
05df851
fix(clients/js): forward multiSigners in permissioned confidential burn
eldarik Jul 29, 2026
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23 changes: 23 additions & 0 deletions clients/js/src/confidentialTransferArithmetic.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -51,6 +51,15 @@ export function extractCiphertextFromGroupedBytes(groupedCiphertext: ReadonlyUin
return ciphertext;
}

function addCiphertexts(left: ReadonlyUint8Array, right: ReadonlyUint8Array) {
const leftPoints = ciphertextToPoints(left);
const rightPoints = ciphertextToPoints(right);
return pointsToCiphertext(
leftPoints.commitment.add(rightPoints.commitment),
leftPoints.handle.add(rightPoints.handle),
);
}

function subtractCiphertexts(left: ReadonlyUint8Array, right: ReadonlyUint8Array) {
const leftPoints = ciphertextToPoints(left);
const rightPoints = ciphertextToPoints(right);
Expand All @@ -70,6 +79,20 @@ function combineLoHiCiphertexts(ciphertextLo: ReadonlyUint8Array, ciphertextHi:
);
}

/**
* Combines lo/hi ciphertext halves (hi << bitLength + lo) and adds the result
* to `left`. Used to compute the new encrypted supply ciphertext after a
* confidential mint.
*/
export function addWithLoHiCiphertexts(
left: ReadonlyUint8Array,
ciphertextLo: ReadonlyUint8Array,
ciphertextHi: ReadonlyUint8Array,
bitLength: bigint,
) {
return addCiphertexts(left, combineLoHiCiphertexts(ciphertextLo, ciphertextHi, bitLength));
}

/**
* Combines lo/hi ciphertext halves (hi << bitLength + lo) and subtracts the
* result from `left`. Used to compute the new available-balance ciphertext
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