SHA2 algorithm implemented by Pascal.
It contains SHA224, SHA256, SHA384, SHA512, SHA512/224, SHA512/256.
You can find SHA2 standard here.
- For Free Pascal 3.2.2, it does not have SHA2 unit, so you can use this to add it.
- For Free Pascal 3.3.1, the fpsha256 and fpsha512 in fcl-hash is not optimized.
- For Delphi, the code's performance in
System.Hashis not optimized. - The SHA256 part have specialized optimization assembler code for i386 and x86_64(basic instruction set).
- The SHA512 part have specialized optimization assembler code for x86_64(basic instruction set).
1 GiB buffer, use FPC 3.2.2 and FPC 3.3.1, optimization level 2, assembler code and pure pascal code.
CPU: AMD Ryzen 5 4600H, System: Windows 11 22H2
| FPC 3.2.2 | i386 | x86_64 |
|---|---|---|
| SHA256 Asm | 266 MiB/s | 281 MiB/s |
| SHA256 Pas | 173 MiB/s | 230 MiB/s |
| SHA512 Asm | N/A | 465 MiB/s |
| SHA512 Pas | 65 MiB/s | 360 MiB/s |
| FPC 3.3.1 | i386 | x86_64 |
|---|---|---|
| SHA256 Asm | 276 MiB/s | 299 MiB/s |
| SHA256 Pas | 145 MiB/s | 228 MiB/s |
| SHA512 Asm | N/A | 468 MiB/s |
| SHA512 Pas | 63 MiB/s | 365 MiB/s |
FPC 3.3.1 seems have better optimization, but the i386 pure pascal is regressed (SHA256 Pas, 173 MiB/s vs 145 MiB/s).
Copy files in source directory to the place you like or add it to search path.
You can find some demos in demos directory.
Use SSE2 for i386 and x86_64.