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authorflu0r1ne <flu0r1ne@flu0r1ne.net>2023-08-27 20:11:39 -0500
committerflu0r1ne <flu0r1ne@flu0r1ne.net>2023-08-27 20:11:39 -0500
commitca592cb6e6a9aeee619d3fd7311030ab34844c2f (patch)
tree11f669e706938416c6139de7650efa05a243fac9 /src/models/crypto/pubkey.c
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Add wg2nd-web sourceHEADmain
Diffstat (limited to 'src/models/crypto/pubkey.c')
-rw-r--r--src/models/crypto/pubkey.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/src/models/crypto/pubkey.c b/src/models/crypto/pubkey.c
new file mode 100644
index 0000000..f43dbfc
--- /dev/null
+++ b/src/models/crypto/pubkey.c
@@ -0,0 +1,73 @@
+#include "curve25519.h"
+#include "encoding.h"
+
+#define WG_KEY_LEN_BASE32 (((WG_KEY_LEN + 4) / 5) * 8 + 1)
+#define WG_KEY_LEN_BASE64 ((((WG_KEY_LEN) + 2) / 3) * 4 + 1)
+
+static inline void encode_base32(char dest[static 8], const uint8_t src[static 5]) {
+ const uint8_t input[] = {
+ src[0] >> 3,
+ ((src[0] & 0x07) << 2) | (src[1] >> 6),
+ (src[1] & 0x3F) >> 1,
+ ((src[1] & 0x01) << 4) | (src[2] >> 4),
+ ((src[2] & 0x0F) << 1) | (src[3] >> 7),
+ (src[3] & 0x7F) >> 2,
+ ((src[3] & 0x03) << 3) | (src[4] >> 5),
+ src[4] & 0x1F
+ };
+
+ for(unsigned int i = 0; i < 8; i++)
+ dest[i] = 'A' + input[i] - (((25 - input[i]) >> 8) & 41);
+}
+
+void key_to_base32(char base32[static WG_KEY_LEN_BASE32], const uint8_t key[static WG_KEY_LEN])
+{
+ unsigned int i;
+
+ for (i = 0; i < WG_KEY_LEN / 5; ++i)
+ encode_base32(&base32[i * 8], &key[i * 5]);
+ encode_base32(&base32[i * 8], (const uint8_t[]){ key[i * 5 + 0], key[i * 5 + 1], 0, 0, 0 });
+ base32[WG_KEY_LEN_BASE32 - 5] = '=';
+ base32[WG_KEY_LEN_BASE32 - 4] = '=';
+ base32[WG_KEY_LEN_BASE32 - 3] = '=';
+ base32[WG_KEY_LEN_BASE32 - 2] = '=';
+ base32[WG_KEY_LEN_BASE32 - 1] = '\0';
+}
+
+int wg_pubkey_base32(char const * privkey, char * base32) {
+
+ uint8_t key[WG_KEY_LEN] __attribute((aligned(sizeof(uintptr_t))));
+ char base64[WG_KEY_LEN_BASE64];
+
+ int i;
+ for(i = 0; privkey[i] && i < WG_KEY_LEN_BASE64 - 1; i++)
+ base64[i] = privkey[i];
+
+ base64[WG_KEY_LEN_BASE64 - 1] = '\0';
+
+ if(i != WG_KEY_LEN_BASE64 - 1 || privkey[i]) {
+ return 1;
+ }
+
+ if(!key_from_base64(key, base64)) {
+ return 1;
+ }
+
+ curve25519_generate_public(key, key);
+
+ key_to_base32(base32, key);
+
+ return 0;
+}
+
+int wg_key_convert_base32(char const * base64, char * base32) {
+ uint8_t key[WG_KEY_LEN] __attribute((aligned(sizeof(uintptr_t))));
+
+ if(!key_from_base64(key, base64)) {
+ return 1;
+ }
+
+ key_to_base32(base32, key);
+
+ return 0;
+}