No, as Apple states, every iOS device has a hardware key.
> Every iOS device has a dedicated AES 256 crypto engine built into the DMA path between the flash storage and main system memory, making file encryption highly efficient.
In newer phones it is in the Secure Enclave instead of the CPU (the SE handles all encryption/decryption for the CPU).
> Every iOS device has a dedicated AES 256 crypto engine built into the DMA path between the flash storage and main system memory, making file encryption highly efficient.
In newer phones it is in the Secure Enclave instead of the CPU (the SE handles all encryption/decryption for the CPU).