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# Prerequisites | ||
*.d | ||
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# Object files | ||
*.o | ||
*.ko | ||
*.obj | ||
*.elf | ||
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# Linker output | ||
*.ilk | ||
*.map | ||
*.exp | ||
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# Precompiled Headers | ||
*.gch | ||
*.pch | ||
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# Libraries | ||
*.lib | ||
*.a | ||
*.la | ||
*.lo | ||
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# Shared objects (inc. Windows DLLs) | ||
*.dll | ||
*.so | ||
*.so.* | ||
*.dylib | ||
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# Executables | ||
*.exe | ||
*.out | ||
*.app | ||
*.i*86 | ||
*.x86_64 | ||
*.hex | ||
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# Debug files | ||
*.dSYM/ | ||
*.su | ||
*.idb | ||
*.pdb | ||
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# Kernel Module Compile Results | ||
*.mod* | ||
*.cmd | ||
.tmp_versions/ | ||
modules.order | ||
Module.symvers | ||
Mkfile.old | ||
dkms.conf | ||
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# Open swap files | ||
*.swp | ||
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# Emacs backup files | ||
*~ | ||
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# Rust build | ||
Cargo.lock | ||
bindings/rust/target |
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<div align="left"> | ||
<img src=blst_logo_small.png> | ||
</div> | ||
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# blst (pronounced 'blast') | ||
A BLS12-381 signature library written in C and assembly focused on performance and security. | ||
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## Status | ||
**This library has not yet been audited. Use at your own risk.** | ||
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Compliant with IETF draft specifications: | ||
- [IETF BLS Signature V2](https://tools.ietf.org/html/draft-irtf-cfrg-bls-signature-02) | ||
- [IETF Hash-to-Curve V8](https://tools.ietf.org/html/draft-irtf-cfrg-hash-to-curve-08) | ||
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Support for x86_64 | ||
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Support for Linux, Mac, and Windows | ||
- Limited testing on Mac and Windows | ||
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Explicit bindings for other languages | ||
- Go | ||
- Rust | ||
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Bindings for other languages provided using [swig](http://swig.org) | ||
- tested Python | ||
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Support for ARM64 is coming soon | ||
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Formal verification will be rolling in to various components of the library over the coming months utilizing [cryptol](https://www.cryptol.net) and [coq](https://coq.inria.fr/) | ||
- Field, curve and bulk signature operations | ||
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## API | ||
The blst API is defined in the C header [bindings/blst.h](https://github.com/supranational/blst/blob/master/bindings/blst.h). The API can be categorized as follows with some example operations: | ||
- Field (add, sub, mul, neg, inv, to/from Montgomery) | ||
- Curve (add, double, mul, to/from affine, group check) | ||
- Intermediate (hash to curve, pairing, serdes) | ||
- BLS12-381 signature core (sign, verify, aggregate) | ||
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Note there is also an auxillary header file [bindings/blst_aux.h](https://github.com/supranational/blst/blob/master/bindings/blst_aux.h) that is used as a staging area for experimental interfaces that may or may not get promoted to blst.h. | ||
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## Build | ||
The build process is very simple and only requires a C complier and Perl. Although pre-built assembly files are provided which can remove the need for Perl. | ||
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### C static library | ||
A static library called libblst.a can be built in current working directory of user's choice. | ||
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Linux, Mac, and Windows (in MinGW or Cygwin environments) | ||
``` | ||
/some/where/build.sh | ||
``` | ||
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Windows (Visual C) | ||
``` | ||
\some\where\build.bat | ||
``` | ||
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## Bindings | ||
Bindings to other languages that implement minimal-signature-size and minimal-pubkey-size variants of the BLS signature specification are provided as follows: | ||
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### Go [src](https://github.com/supranational/blst/tree/master/bindings/go) | ||
TODO - basic details | ||
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For more details see the Go binding [readme](https://github.com/supranational/blst/tree/master/bindings/go/README.md). | ||
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### Rust [src](https://github.com/supranational/blst/tree/master/bindings/rust) | ||
TODO - publish crate | ||
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`blst` is the Rust binding crate. | ||
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To use min-pk version: | ||
``` | ||
use blst::min_pk::*; | ||
``` | ||
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To use min-sig version: | ||
``` | ||
use blst::min_sig::*; | ||
``` | ||
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For more details see the Rust binding [readme](https://github.com/supranational/blst/tree/master/bindings/rust/README.md). | ||
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### Others | ||
TODO - example swig build/usage | ||
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## General notes on implementation | ||
The goal of the blst library is to provide a foundational component for applications and other libraries that require high performance and formally verified BLS12-381 operations. With that in mind some decisions are made to maximize the public good beyond BLS12-381. For example the field operations are optimized for general 384-bit usage as opposed to tuned specifically for the 381-bit BLS12-381 curve parameters. With the formal verification of these foundational components, we believe they can provide a reliable building block for other curves that would like high performance and an extra element of security. | ||
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Library deliberately abstains from dealing with memory management and multi-threading with rationale that these ultimately belong in langugage-/run-time-specific bindings. | ||
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The assembly code is written in perl scripts which can output an assembly file based on the [ABI](https://en.wikipedia.org/wiki/Application_binary_interface) and operating system. For example in the build directory there are pre-build assembly files for elf, mingw64, masm, and macosx. See [build.sh](https://github.com/supranational/blst/blob/master/build.sh) or [refresh.sh](https://github.com/supranational/blst/blob/master/build/refresh.sh) for usage. This method allows for simple reuse of optimized assembly across various platforms with minimal effort. | ||
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Serialization formatting is implemented according to [Appendix A. BLS12-381](https://tools.ietf.org/html/draft-irtf-cfrg-bls-signature-02#appendix-A) of the IETF spec that calls for using the [ZCash definition](https://github.com/zkcrypto/pairing/blob/master/src/bls12_381/README.md#serialization). | ||
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## Performance | ||
Currently both the Go and Rust bindings provide benchmarks for a variety of signature related operations. | ||
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## License | ||
The blst library is licensed under the [Apache License Version 2.0](LICENSE) software license. |
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