github.com/afumu/libc@v0.0.6/musl/src/crypt/crypt_r.c (about)

     1  #include <crypt.h>
     2  
     3  char *__crypt_r(const char *key, const char *salt, struct crypt_data *data)
     4  {
     5  	/* Per the crypt_r API, the caller has provided a pointer to
     6  	 * struct crypt_data; however, this implementation does not
     7  	 * use the structure to store any internal state, and treats
     8  	 * it purely as a char buffer for storing the result. */
     9  	char *output = (char *)data;
    10  	if (salt[0] == '$' && salt[1] && salt[2]) {
    11  		if (salt[1] == '1' && salt[2] == '$')
    12  			return __crypt_md5(key, salt, output);
    13  		if (salt[1] == '2' && salt[3] == '$')
    14  			return __crypt_blowfish(key, salt, output);
    15  		if (salt[1] == '5' && salt[2] == '$')
    16  			return __crypt_sha256(key, salt, output);
    17  		if (salt[1] == '6' && salt[2] == '$')
    18  			return __crypt_sha512(key, salt, output);
    19  	}
    20  	return __crypt_des(key, salt, output);
    21  }
    22  
    23  weak_alias(__crypt_r, crypt_r);