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ChaCha20 implementation for encryption

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Add an implementation in 8051 assembler for the generation of a
ChaCha20 keystream and an encryption function using the keystream
in C.

A test function using the example from RFC7539 is provided in
chacha20_test.

Keys, nonce, and block counter and the pointers to the input plaintext,
its length and the output pointer are provided via a struct chacha20,
which also holds the working state of the ChaCha20 algorithm
This commit is contained in:
logicog
2026-04-26 10:30:55 +02:00
parent e280ccd2f9
commit 85244d85f9
6 changed files with 619 additions and 6 deletions
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Makefile
+6 -5
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@@ -26,11 +26,13 @@ create_build_dir:
mkdir -p $(BUILDDIR)
mkdir -p $(BUILDDIR)/uip
mkdir -p $(BUILDDIR)/httpd
mkdir -p $(BUILDDIR)/crypto
SRCS = rtlplayground.c rtl837x_flash.c rtl837x_leds.c rtl837x_phy.c rtl837x_port.c cmd_parser.c html_data.c rtl837x_igmp.c
SRCS += rtl837x_stp.c rtl837x_pins.c dhcp.c machine.c cmd_editor.c rtl837x_bandwidth.c rtl837x_init.c
SRCS += uip/timer.c uip/uip.c uip/uip_arp.c uip/uiplib.c uip/uip-fw.c uip/uip-neighbor.c uip/uip-split.c
SRCS += httpd/httpd.c httpd/page_impl.c
SRCS += crypto/chacha20.c
OBJS = ${SRCS:%.c=$(BUILDDIR)/%.rel}
DEPS := ${SRCS:%.c=$(BUILDDIR)/%.d}
HTML := $(shell find $(html) -name '*.js' -or -name '*.html' -or -name '*.svg')
@@ -54,14 +56,13 @@ clean:
-rm -f html_data.c html_data.h $(VERSION_HEADER)
-rm -rf $(BUILDDIR)
$(BUILDDIR)/%.rel: %.asm
${ASM} ${AFLAGS} -o $@ $<
$(BUILDDIR)/%.rel: %.c
$(CC) -MMD $(CC_FLAGS) -o $@ -c $<
$(BUILDDIR)/%.rel: %.asm
${ASM} ${AFLAGS} -o $@ $<
# mv -f $(addprefix $(basename $^), .lst .rel .sym) .
$(BUILDDIR)/rtlplayground.ihx: $(OBJS) $(BUILDDIR)/crtstart.rel $(BUILDDIR)/crc16.rel
$(BUILDDIR)/rtlplayground.ihx: $(OBJS) $(BUILDDIR)/crtstart.rel $(BUILDDIR)/crc16.rel $(BUILDDIR)/crypto/chacha_8051.rel
$(CC) $(CC_FLAGS) -Wl-bHOME=0x00000 -Wl-bBANK1=0x14000 -Wl-bBANK2=0x24000 -Wl-r -o $@ $^
$(BUILDDIR)/rtlplayground.img: $(BUILDDIR)/rtlplayground.ihx