DTHE_AES_CTR
ctx->aes_mode = DTHE_AES_CTR;
case DTHE_AES_CTR:
if (ctx->aes_mode == DTHE_AES_CTR && req->cryptlen % AES_BLOCK_SIZE) {
if (ctx->aes_mode == DTHE_AES_CTR && req->cryptlen % AES_BLOCK_SIZE) {
if (ctx->aes_mode != DTHE_AES_CTR)