1Crypt::PRNG(3)        User Contributed Perl Documentation       Crypt::PRNG(3)
2
3
4

NAME

6       Crypt::PRNG - Cryptographically secure random number generator
7

SYNOPSIS

9          ### Functional interface:
10          use Crypt::PRNG qw(random_bytes random_bytes_hex random_bytes_b64 random_bytes_b64u
11                             random_string random_string_from rand irand);
12
13          $octets = random_bytes(45);
14          $hex_string = random_bytes_hex(45);
15          $base64_string = random_bytes_b64(45);
16          $base64url_string = random_bytes_b64u(45);
17          $alphanumeric_string = random_string(30);
18          $string = random_string_from('ACGT', 64);
19          $floating_point_number_0_to_1 = rand;
20          $floating_point_number_0_to_88 = rand(88);
21          $unsigned_32bit_int = irand;
22
23          ### OO interface:
24          use Crypt::PRNG;
25
26          $prng = Crypt::PRNG->new;
27          #or
28          $prng = Crypt::PRNG->new("RC4");
29          #or
30          $prng = Crypt::PRNG->new("RC4", "some data used for seeding PRNG");
31
32          $octets = $prng->bytes(45);
33          $hex_string = $prng->bytes_hex(45);
34          $base64_string = $prng->bytes_b64(45);
35          $base64url_string = $prng->bytes_b64u(45);
36          $alphanumeric_string = $prng->string(30);
37          $string = $prng->string_from('ACGT', 64);
38          $floating_point_number_0_to_1 = $prng->double;
39          $floating_point_number_0_to_88 = $prng->double(88);
40          $unsigned_32bit_int = $prng->int32;
41

DESCRIPTION

43       Provides an interface to the ChaCha20 based pseudo random number
44       generator (thread-safe and fork-safe).
45

FUNCTIONS

47   random_bytes
48          $octets = random_bytes($length);
49
50       Returns $length random octects.
51
52   random_bytes_hex
53          $hex_string = random_bytes_hex($length);
54
55       Returns $length random octects encoded as hexadecimal string.
56
57   random_bytes_b64
58          $base64_string = random_bytes_b64($length);
59
60       Returns $length random octects Base64 encoded.
61
62   random_bytes_b64u
63          $base64url_string = random_bytes_b64u($length);
64
65       Returns $length random octects Base64 URL Safe (RFC 4648 section 5)
66       encoded.
67
68   random_string_from
69          $string = random_string_from($range, $length);
70          #e.g.
71          $string = random_string_from("ABCD", 10);
72
73       Returns a random string made of $length chars randomly chosen from
74       $range string.
75
76   random_string
77          $alphanumeric_string = random_string($length);
78          #or
79          $alphanumeric_string = random_string;  # default length = 20
80
81       Similar to random_string_from, only $range is fixed to
82       'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'.
83
84   rand
85          $n = rand;
86          #or
87          $n = rand($limit);
88
89       Returns a random floating point number from range "[0,1)" (if called
90       without param) or "[0,$limit)".
91
92   irand
93          $i = irand;
94
95       Returns a random unsigned 32bit integer - range 0 .. 0xFFFFFFFF.
96

METHODS

98   new
99          $prng = Crypt::PRNG->new;
100          #or
101          $prng = Crypt::PRNG->new($alg);
102          #or
103          $prng = Crypt::PRNG->new($alg, $seed);
104
105          # $alg  ... algorithm name 'Frotuna' (DEFAULT), 'RC4', 'Sober128' or 'Yarrow'
106          # $seed ... will be used as an initial entropy for seeding PRNG
107
108       If $seed is not specified the PRNG is automatically seeded with 32bytes
109       random data taken from "/dev/random" (UNIX) or "CryptGenRandom" (Win32)
110
111   add_entropy
112         $prng->add_entropy($random_data);
113         #or
114         $prng->add_entropy();
115
116       If called without parameter it uses 32bytes random data taken from
117       "/dev/random" (UNIX) or "CryptGenRandom" (Win32).
118
119       BEWARE: you probably do not need this function at all as the module
120       does automatic seeding on initialization as well as reseeding after
121       fork and thread creation.
122
123   bytes
124          $octets = $prng->bytes($length);
125
126       See random_bytes
127
128   bytes_hex
129          $hex_string = $prng->bytes_hex($length);
130
131       See random_bytes_hex
132
133   bytes_b64
134          $base64_string = $prng->bytes_b64($length);
135
136       See random_bytes_b64
137
138   bytes_b64u
139          $base64url_string = $prng->bytes_b64u($length);
140
141       See random_bytes_b64u
142
143   string
144          $alphanumeric_string = $prng->string($length);
145          #or
146          $alphanumeric_string = $prng->string;
147
148       See random_string
149
150   string_from
151          $string = $prng->string_from($range, $length);
152
153       See random_string_from
154
155   double
156          $n = $prng->double;
157          #or
158          $n = $prng->double($limit);
159
160       See rand
161
162   int32
163          $i = $prng->int32;
164
165       See irand
166

SEE ALSO

168       Crypt::PRNG::Fortuna, Crypt::PRNG::RC4, Crypt::PRNG::Sober128,
169       Crypt::PRNG::Yarrow
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173perl v5.28.1                      2017-09-15                    Crypt::PRNG(3)
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