29 lines
1.1 KiB
Markdown
29 lines
1.1 KiB
Markdown
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This library provides four constant-time implementations of scalar multiplication on Curve25519:
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1. **PORTABLE** is a C-language implementation based on public domain "ref10" code by Daniel J. Bernstein. It uses 26-bit limbs.
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2. **ARM64** is an optimized 100% assembly implementation for 64-bit ARM CPUs written by Emil Lenngren. It uses 26-bit limbs and can run 3 field operations in parallel by interleaving A64 and NEON instructions.
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3. **AMD64** is an optimized 100% assembly implementation for 64-bit x86 CPUs. It uses 64-bit limbs.
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4. **AMD64X** is an optimized 100% assembly implementation targeting AMD Ryzen, Intel Broadwell and newer CPUs. It uses the `mulx`, `adcx` and `adox` instructions with 64-bit limbs.
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A specific implementation can be selected at runtime using the [API](include/mx25519.h). Passing the `MX25519_TYPE_AUTO` flag automatically selects the fastest implementation supported by the current machine.
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## Build
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```
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git clone https://github.com/tevador/mx25519.git
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cd mx25519
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mkdir build
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cd build
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cmake ..
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make
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```
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```
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./mx25519-tests
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./mx25519-bench
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```
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On Windows, building with Visual Studio is also supported.
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## Performance
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