Add a "fork" of musl as //fusl.

fusl/src/crypt/encrypt.c

+#include <stdint.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+struct expanded_key {
+        uint32_t l[16], r[16];
+};
+
+void __des_setkey(const unsigned char *key, struct expanded_key *ekey);
+void __do_des(uint32_t l_in, uint32_t r_in,
+    uint32_t *l_out, uint32_t *r_out,
+    uint32_t count, uint32_t saltbits, const struct expanded_key *ekey);
+
+
+static struct expanded_key __encrypt_key;
+
+void setkey(const char *key)
+{
+        unsigned char bkey[8];
+        int i, j;
+
+        for (i = 0; i < 8; i++) {
+                bkey[i] = 0;
+                for (j = 7; j >= 0; j--, key++)
+                        bkey[i] |= (uint32_t)(*key & 1) << j;
+        }
+
+        __des_setkey(bkey, &__encrypt_key);
+}
+
+void encrypt(char *block, int edflag)
+{
+        struct expanded_key decrypt_key, *key;
+        uint32_t b[2];
+        int i, j;
+        char *p;
+
+        p = block;
+        for (i = 0; i < 2; i++) {
+                b[i] = 0;
+                for (j = 31; j >= 0; j--, p++)
+                        b[i] |= (uint32_t)(*p & 1) << j;
+        }
+
+        key = &__encrypt_key;
+        if (edflag) {
+                key = &decrypt_key;
+                for (i = 0; i < 16; i++) {
+                        decrypt_key.l[i] = __encrypt_key.l[15-i];
+                        decrypt_key.r[i] = __encrypt_key.r[15-i];
+                }
+        }
+
+        __do_des(b[0], b[1], b, b + 1, 1, 0, key);
+
+        p = block;
+        for (i = 0; i < 2; i++)
+                for (j = 31; j >= 0; j--)
+                        *p++ = b[i]>>j & 1;
+}