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base: gitproxy/RTLPlayground:4e39d81992ad9fabfd6cff4e8afcb7aa252e97a6
gitproxy/RTLPlayground:main gitproxy/RTLPlayground:zoerax_hg0402xg gitproxy/RTLPlayground:chacha20 gitproxy/RTLPlayground:zoerax gitproxy/RTLPlayground:rtl8221b_100m_support gitproxy/RTLPlayground:2x10g gitproxy/RTLPlayground:revert-252-main gitproxy/RTLPlayground:sfp_speed gitproxy/RTLPlayground:dhcpd gitproxy/RTLPlayground:ZX_SWTGW215AS gitproxy/RTLPlayground:multcon
gitproxy/RTLPlayground:v0_1_alpha
..
compare: gitproxy/RTLPlayground:555aa9820dc1fe6a27fba8054307cb9986b0d86d
gitproxy/RTLPlayground:main gitproxy/RTLPlayground:zoerax_hg0402xg gitproxy/RTLPlayground:chacha20 gitproxy/RTLPlayground:zoerax gitproxy/RTLPlayground:rtl8221b_100m_support gitproxy/RTLPlayground:2x10g gitproxy/RTLPlayground:revert-252-main gitproxy/RTLPlayground:sfp_speed gitproxy/RTLPlayground:dhcpd gitproxy/RTLPlayground:ZX_SWTGW215AS gitproxy/RTLPlayground:multcon
gitproxy/RTLPlayground:v0_1_alpha
2 Commits
4e39d81992 .. 555aa9820d
Author SHA1 Message Date
logicog 555aa9820d Makefile: Lower limit of --xram-size to protect ChaCha20 space 
ChaCha20 uses 256 bytes starting from 0xbf00 for its calculations.
Make sure the linker checks that this space is not overwritten.
 2026-10-10 07:31:35 +02:00
logicog 1c685edde5 ChaCha20 implementation for encryption 
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
 2026-10-10 07:31:35 +02:00
1 changed files with 7 additions and 2 deletions
Expand all files Collapse all files
crypto/chacha20.c
+7 -2
View File
@@ -9,9 +9,13 @@ void chacha_count(void);
__xdata struct chacha20_t __at(0xbf00) chacha20; __xdata struct chacha20_t __at(0xbf00) chacha20;
#ifdef CHACHA20_TEST
__xdata uint8_t plaintext[256]; __xdata uint8_t plaintext[256];
__xdata uint8_t cyphertext[256]; __xdata uint8_t cyphertext[256];
#endif
#ifdef DEBUG
void chacha20_print_block(void) void chacha20_print_block(void)
{ {
for (uint8_t i=0; i < 64; i++) { for (uint8_t i=0; i < 64; i++) {
@@ -20,7 +24,7 @@ void chacha20_print_block(void)
write_char(' '); write_char(' ');
} }
} }
#endif
void chacha20_encrypt(void) void chacha20_encrypt(void)
{ {
@@ -47,7 +51,7 @@ void chacha20_encrypt(void)
}; };
} }
#ifdef CHACHA20_TEST
// Test the example of RFC 7539 Section 2.4.2 // Test the example of RFC 7539 Section 2.4.2
void chacha20_test(void) void chacha20_test(void)
{ {
@@ -96,3 +100,4 @@ void chacha20_test(void)
print_byte(cyphertext[i]); write_char(' '); print_byte(cyphertext[i]); write_char(' ');
} }
} }
#endif