/* Provenance: openssl/openssl chacha20_poly1305_cipher (fixed).
 * repo: openssl/openssl
 * commit: 119ab9555dc62275bbd71f6f49529b1a44feba42
 * parent: 39488cb863074d5b8ece833905f7ad2b357d44fe
 * commit_url: https://github.com/openssl/openssl/commit/119ab9555dc62275bbd71f6f49529b1a44feba42
 * cve: CVE-2026-75803
 * license: Apache-2.0
 * function: chacha20_poly1305_cipher
 * relpath: providers/implementations/ciphers/cipher_chacha20_poly1305.c
 */

static int chacha20_poly1305_cipher(void *vctx, unsigned char *out,
    size_t *outl, size_t outsize,
    const unsigned char *in, size_t inl)
{
    PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
    PROV_CIPHER_HW_CHACHA20_POLY1305 *hw = (PROV_CIPHER_HW_CHACHA20_POLY1305 *)ctx->hw;

    if (!ossl_prov_is_running())
        return 0;

    if (outsize < inl) {
        ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
        return 0;
    }

    if (!hw->aead_cipher(ctx, out, outl, in, inl))
        return 0;

    return 1;
}