ChaChaPoly = object

ChaChaPolyKey = array[ChaChaPolyKeySize, byte]

ChaChaPolyNonce = array[ChaChaPolyNonceSize, byte]

ChaChaPolyTag = array[ChaChaPolyTagSize, byte]

proc decrypt(_: type[ChaChaPoly]; key: ChaChaPolyKey; nonce: ChaChaPolyNonce;
             tag: var ChaChaPolyTag; data: var openArray[byte];
             aad: openArray[byte]) {....raises: [Defect].}

proc encrypt(_: type[ChaChaPoly]; key: ChaChaPolyKey; nonce: ChaChaPolyNonce;
             tag: var ChaChaPolyTag; data: var openArray[byte];
             aad: openArray[byte]) {....raises: [Defect].}

proc intoChaChaPolyKey(s: openArray[byte]): ChaChaPolyKey {....raises: [Defect],
    tags: [].}

proc intoChaChaPolyNonce(s: openArray[byte]): ChaChaPolyNonce {.
    ...raises: [Defect], tags: [].}

proc intoChaChaPolyTag(s: openArray[byte]): ChaChaPolyTag {....raises: [Defect],
    tags: [].}

proc ourPoly1305CtmulRun(key: pointer; iv: pointer; data: pointer; len: int;
                         aad: pointer; aadLen: int; tag: pointer;
                         ichacha: pointer; encrypt: cint) {.cdecl,
    importc: "br_poly1305_ctmul_run", header: "bearssl_block.h",
    ...raises: [Defect], tags: [].}