diff options
Diffstat (limited to 'crypt/examples')
-rw-r--r-- | crypt/examples/genpass.c | 32 | ||||
-rw-r--r-- | crypt/examples/mygetpass.c | 25 | ||||
-rw-r--r-- | crypt/examples/testpass.c | 26 |
3 files changed, 83 insertions, 0 deletions
diff --git a/crypt/examples/genpass.c b/crypt/examples/genpass.c new file mode 100644 index 0000000..a7626db --- /dev/null +++ b/crypt/examples/genpass.c @@ -0,0 +1,32 @@ +#include <stdio.h> +#include <time.h> +#include <unistd.h> +#include <crypt.h> + +int +main(void) +{ + unsigned long seed[2]; + char salt[] = "$1$........"; + const char *const seedchars = + "./0123456789ABCDEFGHIJKLMNOPQRST" + "UVWXYZabcdefghijklmnopqrstuvwxyz"; + char *password; + int i; + + /* Generate a (not very) random seed. + You should do it better than this... */ + seed[0] = time(NULL); + seed[1] = getpid() ^ (seed[0] >> 14 & 0x30000); + + /* Turn it into printable characters from `seedchars'. */ + for (i = 0; i < 8; i++) + salt[3+i] = seedchars[(seed[i/5] >> (i%5)*6) & 0x3f]; + + /* Read in the user's password and encrypt it. */ + password = crypt(getpass("Password:"), salt); + + /* Print the results. */ + puts(password); + return 0; +} diff --git a/crypt/examples/mygetpass.c b/crypt/examples/mygetpass.c new file mode 100644 index 0000000..6fe06f4 --- /dev/null +++ b/crypt/examples/mygetpass.c @@ -0,0 +1,25 @@ +#include <termios.h> +#include <stdio.h> + +ssize_t +my_getpass (char **lineptr, size_t *n, FILE *stream) +{ + struct termios old, new; + int nread; + + /* Turn echoing off and fail if we can't. */ + if (tcgetattr (fileno (stream), &old) != 0) + return -1; + new = old; + new.c_lflag &= ~ECHO; + if (tcsetattr (fileno (stream), TCSAFLUSH, &new) != 0) + return -1; + + /* Read the password. */ + nread = getline (lineptr, n, stream); + + /* Restore terminal. */ + (void) tcsetattr (fileno (stream), TCSAFLUSH, &old); + + return nread; +} diff --git a/crypt/examples/testpass.c b/crypt/examples/testpass.c new file mode 100644 index 0000000..5bd616d --- /dev/null +++ b/crypt/examples/testpass.c @@ -0,0 +1,26 @@ +#include <stdio.h> +#include <string.h> +#include <unistd.h> +#include <crypt.h> + +int +main(void) +{ + /* Hashed form of "GNU libc manual". */ + const char *const pass = "$1$/iSaq7rB$EoUw5jJPPvAPECNaaWzMK/"; + + char *result; + int ok; + +/*@group*/ + /* Read in the user's password and encrypt it, + passing the expected password in as the salt. */ + result = crypt(getpass("Password:"), pass); +/*@end group*/ + + /* Test the result. */ + ok = strcmp (result, pass) == 0; + + puts(ok ? "Access granted." : "Access denied."); + return ok ? 0 : 1; +} |