libbbs

Specification-compliant and performant C implementation of the BBS signature scheme with little to no third party dependencies.

Provides a library libbbs implementing the BLS12-381-SHA-256 and BLS12-381-SHAKE-256 cipher suite.

Prerequisites

Dependencies:

• cmake (build only)
• gmp (optional, faster than the default)

mkdir build
cd build
cmake .. # Without GMP or
cmake -DRELIC_ARITH="gmp" .. # (if you have gmp)

Installation

Within build:

make install

Test

Within build:

make
make test

Benchmark

Within build:

./test/bbs-test-bench

Benchmark (bbs_bench_individual) on M1 Pro 2021 16GB with -DRELIC_ARITH="gmp":

• 2 messages each of size 64 bytes
• Disclosing first message only
• Runtime averaged over 1000 iterations without warmup

Function	SHA256 (ms)	SHAKE256 (ms)
key generation (SK & PK)	0,174	0,172
sign	1,995	1,888
verify	3,877	3,829
proof generation	3,289	3,220
proof verification	4,532	4,482

Documentation

See https://fraunhofer-aisec.github.io/libbbs/doxy/html/

Code coverage

See https://fraunhofer-aisec.github.io/libbbs/lcov