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NAMECrypt::AuthEnc::ChaCha20Poly1305 - Authenticated encryption in ChaCha20-Poly1305 mode SYNOPSIS### OO interface use Crypt::AuthEnc::ChaCha20Poly1305; # encrypt and authenticate my $ae = Crypt::AuthEnc::ChaCha20Poly1305->new($key, $iv); $ae->adata_add('additional_authenticated_data1'); $ae->adata_add('additional_authenticated_data2'); my $ct = $ae->encrypt_add('data1'); $ct .= $ae->encrypt_add('data2'); $ct .= $ae->encrypt_add('data3'); my $tag = $ae->encrypt_done(); # decrypt and verify my $ae = Crypt::AuthEnc::ChaCha20Poly1305->new($key, $iv); $ae->adata_add('additional_authenticated_data1'); $ae->adata_add('additional_authenticated_data2'); my $pt = $ae->decrypt_add('ciphertext1'); $pt .= $ae->decrypt_add('ciphertext2'); $pt .= $ae->decrypt_add('ciphertext3'); my $tag = $ae->decrypt_done(); die "decrypt failed" unless $tag eq $expected_tag; #or my $result = $ae->decrypt_done($expected_tag); # 0 or 1 ### functional interface use Crypt::AuthEnc::ChaCha20Poly1305 qw(chacha20poly1305_encrypt_authenticate chacha20poly1305_decrypt_verify); my ($ciphertext, $tag) = chacha20poly1305_encrypt_authenticate($key, $iv, $adata, $plaintext); my $plaintext = chacha20poly1305_decrypt_verify($key, $iv, $adata, $ciphertext, $tag); DESCRIPTIONProvides encryption and authentication based on ChaCha20 + Poly1305 as defined in RFC 7539 - <https://tools.ietf.org/html/rfc7539> EXPORTNothing is exported by default. You can export selected functions: use Crypt::AuthEnc::ChaCha20Poly1305 qw(chacha20poly1305_encrypt_authenticate chacha20poly1305_decrypt_verify); FUNCTIONSchacha20poly1305_encrypt_authenticatemy ($ciphertext, $tag) = chacha20poly1305_encrypt_authenticate($key, $iv, $adata, $plaintext); # $key ..... key of proper length (128 or 256 bits / 16 or 32 bytes) # $iv ...... initialization vector (64 or 96 bits / 8 or 12 bytes) # $adata ... additional authenticated data (optional) chacha20poly1305_decrypt_verifymy $plaintext = chacha20poly1305_decrypt_verify($key, $iv, $adata, $ciphertext, $tag); # on error returns undef METHODSnewmy $ae = Crypt::AuthEnc::ChaCha20Poly1305->new($key, $iv); # $key ..... encryption key of proper length (128 or 256 bits / 16 or 32 bytes) # $iv ...... initialization vector (64 or 96 bits / 8 or 12 bytes) adata_addAdd additional authenticated data. Can be called before the first "encrypt_add" or "decrypt_add"; $ae->adata_add($aad_data); # can be called multiple times encrypt_add$ciphertext = $ae->encrypt_add($data); # can be called multiple times encrypt_done$tag = $ae->encrypt_done(); # returns $tag value decrypt_add$plaintext = $ae->decrypt_add($ciphertext); # can be called multiple times decrypt_donemy $tag = $ae->decrypt_done; # returns $tag value #or my $result = $ae->decrypt_done($tag); # returns 1 (success) or 0 (failure) set_ivmy $ae = Crypt::AuthEnc::ChaCha20Poly1305->new($key)->set_iv($iv); # $iv ...... initialization vector (64 or 96 bits / 8 or 12 bytes) set_iv_rfc7905See <https://tools.ietf.org/html/rfc7905> my $ae = Crypt::AuthEnc::ChaCha20Poly1305->new($key)->set_iv_rfc7905($iv, $seqnum); # $iv ...... initialization vector (96 bits / 12 bytes) # $seqnum .. 64bit integer (sequence number) clonemy $ae_new = $ae->clone; SEE ALSO
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