Cryptographic Hardware Accelerators
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Linux provides a cryptography framework in the kernel that can be used for e.g. IPsec and dm-crypt. Some SoCs, co-prosessors, and extension boards provide hardware acceleration for speeding up cryptographic operations. The Allwinner boards provide varying degrees of hardware support for such operations (e.g. AES/DES/3DES, MD5/SHA1/SHA224/SHA256/SHA384/SHA512, and random number generation). The current status of the sunxi support in mainline kernels is documented in http://sunxi.montjoie.ovh/#support_overview
Support status
| Driver | sun4i-ss | sun8i-ss | sun8i-ce | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Category | Name | A20 | A10 | A10S | A31 | A33 | V3S | A80 | A83T | H3 | A64 | H5 | H6 | Note |
| AES/DES/3DES | CBC | 4.3 | 4.3 | NT | 4.3 | 4.3 | WIP | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | |
| ECB | 4.3 | 4.3 | NT | 4.3 | 4.3 | WIP | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | ||
| CTS | NO(1)(2) | NO | NO | NO | NO | NO | NT | WIP | OK | OK | OK | WIP | (1)(2) | |
| CTR | NO(1)(3) | NO | NO | NO | NO | NO | NT | WIP | OK | OK | OK | WIP | (1)(3) | |
| OFB | WIP | WIP | ||||||||||||
| CFB | WIP | WIP | ||||||||||||
| CBC-MAC | WIP | WIP | ||||||||||||
| XTS | OK | |||||||||||||
| HASH | MD5 | 4.3 | 4.3 | NT | 4.3 | 4.3 | WIP | NT | 5.10 | 5.10 | 5.10 | 5.10 | 5.10 | |
| SHA1 | 4.3 | 4.3 | NT | 4.3 | 4.3 | WIP | NT | 5.10 | 5.10 | 5.10 | 5.10 | 5.10 | ||
| SHA224 | NT | 5.10 | 5.10 | 5.10 | 5.10 | 5.10 | ||||||||
| SHA256 | NT | 5.10 | 5.10 | 5.10 | 5.10 | 5.10 | ||||||||
| SHA384 | 5.10 | 5.10 | ||||||||||||
| SHA512 | 5.10 | 5.10 | ||||||||||||
| HMAC-SHA1 | WIP | WIP | WIP | WIP | ||||||||||
| HMAC-SHA256 | WIP | WIP | ||||||||||||
| RNG | PRNG | 4.14 | 4.14 | 4.14 | 4.14 | 4.14 | WIP | NT | 5.10 | 5.10 | 5.10 | 5.10 | 5.10 | (8) |
| TRNG | NO | ??(10) | ??(10) | ??(10) | ??(10) | 5.10 | ||||||||
| RSA | 512 | WIP | SNW (9) | OK | OK | WIP | ||||||||
| 1024 | WIP | SNW (9) | OK | OK | WIP | |||||||||
| 2048 | NO | WIP | SNW (9) | OK | OK | WIP | ||||||||
| 3072 | WIP | SNW (9) | SNW | WIP | ||||||||||
| 4096 | SNW (9) | SNW | WIP | |||||||||||
| ECC | 160 | WIP | ||||||||||||
| 224 | WIP | |||||||||||||
| 256 | WIP | |||||||||||||
| 384 | WIP | |||||||||||||
| 521 | WIP | |||||||||||||
| CRC | CRC32 | WIP | ||||||||||||
| Note | (7) | (5) | (6) | |||||||||||
Legend
- 4.3 support is available since Linux x
- OOT support is available via an out of source patch
- NO support is not written
- WIP support is being written
- NT Need hardware for testing
- SNW Unsupported according to datasheet, but work. (Need extended testing)
Read the datasheet for more details.
Notes
- (1): CTR and CTS are not available due to hardware bug see this answer on linux-crypto
- (2): CTS block mode is not available for DES/3DES according to datasheet
- (3): CTR mode is referenced as CNT mode in the datasheet
- (7): The PRNG does not seem to work on A10 for the moment
- (8): See the PRNG section
- (9): Allwinner have removed all RSA documentation from the H3 user manual 1.2
- (10): The TRNG is not really random due do lack of documentation