ossl_chacha20_einit
{ OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))ossl_chacha20_einit },
OSSL_FUNC_cipher_encrypt_init_fn ossl_chacha20_einit;
return ossl_chacha20_einit(&ctx->chacha, key, keylen, NULL, 0, NULL);
ret = ossl_chacha20_einit(&ctx->chacha, NULL, 0,