[riot-notifications] [RIOT-OS/RIOT] Initial implementation of IEEE 802.15.4 security (#15150)

[fabian18]

@fabian18 commented on this pull request.



> +        _init_cbc_B0(&ccm, frame_counter, security_level, c_len, mac_size, src_address);
+        memset(tmp2, 0, sizeof(tmp2));
+        _cbc_next(ctx, tmp2, tmp1, (uint8_t *)&ccm, sizeof(ccm));
+        byteorder_htobebufs(tmp1, a_len);
+        off = _min(sizeof(tmp1) - sizeof(uint16_t), a_len);
+        memcpy(tmp1 + sizeof(uint16_t), a, off);
+        _cbc_next(ctx, tmp2, tmp1, tmp1, sizeof(uint16_t) + off);
+        for (;off < a_len;) {
+            off += _cbc_next(ctx, tmp2, tmp1, &a[off], a_len - off);
+        }
+        for (off = 0; off < c_len;) {
+            off += _cbc_next(ctx, tmp2, tmp1, &c[off], c_len - off);
+        }

Yes I could probably make it another function `_comp_mic()` or something like that.

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