EVP_chacha20
if (!EVP_CipherInit(ctx->main_evp, EVP_chacha20(), key, NULL, 1))
if (!EVP_CipherInit(ctx->header_evp, EVP_chacha20(), key + 32, NULL, 1))
EVP_add_cipher(EVP_chacha20());
const EVP_CIPHER *EVP_chacha20(void);
return do_test_bio_cipher(EVP_chacha20(), idx);
cipher = EVP_chacha20();
.evp_cipher = EVP_chacha20 },