method

crypt

Ruby latest stable (v1_8_7_72) - 2 notes - Class: String

crypt(p1) public

Applies a one-way cryptographic hash to str by invoking the standard library function crypt. The argument is the salt string, which should be two characters long, each character drawn from [a-zA-Z0-9./].

Show source

/*
 *  call-seq:
 *     str.crypt(other_str)   => new_str
 *  
 *  Applies a one-way cryptographic hash to <i>str</i> by invoking the standard
 *  library function <code>crypt</code>. The argument is the salt string, which
 *  should be two characters long, each character drawn from
 *  <code>[a-zA-Z0-9./]</code>.
 */

static VALUE
rb_str_crypt(str, salt)
    VALUE str, salt;
{
    extern char *crypt _((const char *, const char*));
    VALUE result;
    const char *s;

    StringValue(salt);
    if (RSTRING(salt)->len < 2)
        rb_raise(rb_eArgError, "salt too short(need >=2 bytes)");

    if (RSTRING(str)->ptr) s = RSTRING(str)->ptr;
    else s = "";
    result = rb_str_new2(crypt(s, RSTRING(salt)->ptr));
    OBJ_INFECT(result, str);
    OBJ_INFECT(result, salt);
    return result;
}

May 4, 2009

1 thank

clarification

Via Kenneth Kalmer:

From the man page: If salt is a character string starting with the characters “$id$” followed by a string terminated by “$”: $id$salt$encrypted then instead of using the DES machine, id identifies the encryption method used and this then determines how the rest of the password string is interpreted.

irb session

  => “abNANd1rDfiNc”
  irb(main):002:0> “secret”.crypt(”abasasa”)
  => “abNANd1rDfiNc”
  irb(main):003:0> “secret”.crypt(”$1$abasasa”)
  => “$1$abasasa$2RZY2vd6E2ZEPSDa0eLec0″
  irb(main):004:0> “secret”.crypt(”$1$abasa”)
  => “$1$abasa$ikoKICgwOFdcWgmDl9Asy1″

see http://www.opensourcery.co.za/2009/05/01/quick-nix-shadow-passwords-with-ruby/

February 11, 2010 - (v1_8_6_287 - v1_8_7_72)

0 thanks

Clarification of argument

The description should read:

The argument is the salt string, which must be at least two characters long, each character drawn from [a-zA-Z0-9./].

crypt

Related methods

clarification

irb session

Clarification of argument