corpus Directory Reference

Directory dependency graph for corpus:

Detailed Description

Fuzz corpus — DER parser seeds

Place binary seed files in this directory before running fuzz_der.

Recommended seeds

DER ECDSA signatures (selector = 0x00)

Files must start with 0x00, followed by a raw DER ECDSA signature. A minimal valid P-256 DER signature (70–72 bytes) looks like: 30 44 02 20 <r[32]> 02 20 <s[32]>

Extract a real signature from any Cryptnox transaction and prepend 0x00.

Manufacturer certificate blobs (selector = 0x01)

Files must start with 0x01, followed by a raw DER X.509 certificate. Obtain a real Cryptnox manufacturer certificate via CW_SecureChannel::getManufacturerCertificate() and prepend 0x01.

Example (Linux/macOS)

# Prepend selector byte 0x01 to an existing DER cert
printf '\x01' | cat - mfr_cert.der > corpus/cert_01.bin
 
# Prepend selector byte 0x00 to an existing DER signature
printf '\x00' | cat - sig.der > corpus/sig_00.bin

Running the fuzzer

cd cryptnox-sdk-cpp/fuzz
mkdir build && cd build
cmake .. -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++
make
./fuzz_der ../corpus/ -max_len=512 -jobs=4