Initial import: ultra-small bruteforce tool, docs, and .gitignore

brute/source/Dockerfile

@@ -0,0 +1,26 @@
+FROM alpine:latest AS build
+
+RUN apk add --no-cache build-base musl-dev linux-headers upx
+WORKDIR /src
+
+# Copy all yescrypt source and header files flat
+COPY yescrypt/*.h .
+COPY yescrypt/yescrypt-ref.c .
+COPY yescrypt/yescrypt-common.c .
+COPY yescrypt/sha256.c .
+COPY yescrypt/insecure_memzero.c .
+
+COPY bruteforce.c .
+
+RUN gcc -static -Os -s -o bruteforce \
+    bruteforce.c \
+    yescrypt-ref.c \
+    yescrypt-common.c \
+    sha256.c \
+    insecure_memzero.c \
+    && strip --strip-all --remove-section=.comment bruteforce \
+    && upx --ultra-brute bruteforce
+
+FROM scratch
+COPY --from=build /src/bruteforce /
+ENTRYPOINT ["/bruteforce"]