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Gcrypt

cpan:CTILMES

Raku Gcrypt - Bindings for GNU Libgcrypt

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Introduction

A Raku interface to libgcrypt.

Libgcrypt is a general purpose cryptographic library originally
based on code from GnuPG. It provides functions for all
cryptograhic building blocks: symmetric cipher algorithms (AES,
Arcfour, Blowfish, Camellia, CAST5, ChaCha20 DES, GOST28147,
Salsa20, SEED, Serpent, Twofish) and modes
(ECB,CFB,CBC,OFB,CTR,CCM,GCM,OCB,POLY1305,AESWRAP), hash
algorithms (MD2, MD4, MD5, GOST R 34.11, RIPE-MD160, SHA-1,
SHA2-224, SHA2-256, SHA2-384, SHA2-512, SHA3-224, SHA3-256,
SHA3-384, SHA3-512, SHAKE-128, SHAKE-256, TIGER-192, Whirlpool),
MACs (HMAC for all hash algorithms, CMAC for all cipher
algorithms, GMAC-AES, GMAC-CAMELLIA, GMAC-TWOFISH, GMAC-SERPENT,
GMAC-SEED, Poly1305, Poly1305-AES, Poly1305-CAMELLIA,
Poly1305-TWOFISH, Poly1305-SERPENT, Poly1305-SEED), and
random numbers.

Note, this is still a work in progress, more features may or may not be forthcoming!! Patches welcome!!

Usage

Message Digest (Hash)

A message digest or cryptographic hash function is a function that maps data of arbitrary size to a bit string of fixed size, the hash or digest.

use Gcrypt::Simple :MD5;       # Import routines you specify, or use :ALL for all

say MD5('Some text').hex;      # 9db5682a4d778ca2cb79580bdb67083f

say MD5(slurp).hex;            # print md5sum of STDIN

my $obj = MD5;                 # Get a new object
$obj.write("$_\n") for lines;  # Incremental calculation

say $obj.digest;               # Blob
say $obj.hex;                  # Hex string
say $obj.dec;                  # Decimal
say $obj.hex(:reset);          # Each of these can take :reset to reset the obj

$obj.reset;                    # or call reset to Reuse object on another message

Available Hashes:

MD5 SHA1 RIPEMD160 TIGER SHA256 SHA384 SHA512 SHA224 MD4 CRC32 CRC32_RFC1510 CRC24_RFC2440 WHIRLPOOL TIGER1 TIGER2 GOSTR3411_94 STRIBOG256 STRIBOG512 SHA3_224 SHA3_256 SHA3_384 SHA3_512 SHAKE128 SHAKE256 BLAKE2B_512 BLAKE2B_384 BLAKE2B_256 BLAKE2B_160 BLAKE2S_256 BLAKE2S_224 BLAKE2S_160 BLAKE2S_128

See Available hash algorithms for more details on each algorithm.

Note that SHAKE128 and SHAKE256 are extendable-output functions (XOF), and can produce variable amounts of output. Pass in the number of bytes you want to digest, hex or dec:

use Gcrypt::Simple :SHAKE128;
say SHAKE128('Some text').hex(16);

Message Authentication Codes (MAC)

A message authentication code is a short code used to authenticate that a message came from the stated sender (its authenticity) and has not been changed.

To create one, you need a key and the message.

use Gcrypt::Simple :HMAC_MD5;       # Select algorithm, or :ALL for all

say HMAC_MD5('mykey', 'my message').hex;
# f50357b6299b741cf6b1c63073e54112

my $obj = HMAC_MD5('mykey');        # Create object
$obj.write('my message');           # Add data
say $obj.MAC;                       # Blob
say $obj.hex;                       # Hex string
say $obj.hex(:reset);               # Can also pass :reset to MAC or hex
$obj.reset;                         # or reset to reuse object on another message

Key is truncated or 0 extended to the size for the algorithm. ($obj.keylen will tell you the algorithm's key size).

Available MAC algorithms:

HMAC_SHA256 HMAC_SHA224 HMAC_SHA512 HMAC_SHA384 HMAC_SHA1 HMAC_MD5 HMAC_MD4 HMAC_RIPEMD160 HMAC_TIGER HMAC_WHIRLPOOL HMAC_GOSTR3411_94 HMAC_STRIBOG256 HMAC_STRIBOG512 HMAC_SHA3_224 HMAC_SHA3_256 HMAC_SHA3_384 HMAC_SHA3_512 CMAC_AES CMAC_3DES CMAC_Camellia CMAC_CAST5 CMAC_Blowfish CMAC_Twofish CMAC_Serpent CMAC_SEED CMAC_RFC2268 CMAC_IDEA CMAC_GOST28147 GMAC_AES GMAC_Camellia GMAC_Twofish GMAC_Serpent GMAC_SEED POLY1305

See Available MAC algorithms for more details on each algorithm.

Symmetric cryptography ciphers

use Gcrypt::Simple :IDEA;

my $key = 'foobar';
my $encrypted = IDEA($key).encrypt('Some text');
say IDEA($key).decrypt($encrypted);

my $obj = IDEA($key);                       # Create object
my $encrypted = $obj.encrypt('Some text');
$obj.reset;                                 # Reuse object
say $obj.decrypt($encrypted);

Available Ciphers:

IDEA DES3 CAST5 Blowfish AES AES192 AES256 Twofish RC4 DES Twofish128 Serpent128 Serpent192 RFC2268_40 SEED Camellia128 Camellia192 Camellia256 Salsa20 Salsa20R12 GOST28147 ChaCha20

See Available ciphers for more details on each algorithm.

Random

use Gcrypt::Random;

my $rand = random(10);
# Buf[uint8].new(148,229,159,236,230,13,154,226,245,23)
my $rand = random(10, :weak);           # actually the same as strong
my $rand = random(10, :strong);         # default
my $rand = random(10, :very-strong);    # stronger
my $rand = nonce(10);                   # Actually weak, but unpredictable

Returns a buffer of random bytes.

See Quality of random numbers for more information.

Passphrase

Derive a key from a string

use Gcrypt::Passphrase;

my $passphrase = "This is a long and complicated passphrase.";

my $key = key-from-passphrase($passphrase,
                              keysize => 16,
                              algorithm => 'SIMPLE_S2K',
                              subalgorithm => 'SHA1');

$key = key-from-passphrase($passphrase,
                           keysize => 64,
                           algorithm => 'ITERSALTED_S2K',
                           subalgorithm => 'SHA512',
                           iterations => 12,
                           salt => 'abcdefgh');

See Key Derivation for more information.

libgcrypt versions/features

You can check the version by calling Gcrypt.version which returns the version as a string:

use Gcrypt;
say Gcrypt.version;   # '1.7.6beta' or '1.8.1' or whatever

You can query the library for its capabilities with Gcrypt.config:

use Gcrypt;
say Gcrypt.config;               # Get all configuration
say Gcrypt.config('ciphers');    # List available ciphers
say Gcrypt.config('digests');    # List available digests

NOTE: config has a known problem on CentOS and is likely not to work.

Multi-threading

Most Gcrypt actions are thread-safe.

The error strings use a static memory buffer, so make sure only one thread is printing out an Exception message at a time. You can use the exception's integer code safely.

Installation

Many distributions already have libgcrypt installed, but if not, get it first:

Then zef install Gcrypt

License

This work is subject to the Artistic License 2.0.

See LICENSE for more information.