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(PHP ActiveX) ChaCha20 EncryptionDemonstrates ChaCha20 encryption and decryption. (Introduced in Chilkat v9.5.0.55) This example duplicates the results of Test Vector #3 for ChaCha20 Encryption in RFC 7539.
<?php // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Crypt2') $crypt = new COM("Chilkat.Crypt2"); // Set the encryption algorithm to chacha20 // chacha20 is a stream cipher, and therefore no cipher mode applies. $crypt->CryptAlgorithm = 'chacha20'; // The key length for chacha20 is always 256-bits. $crypt->KeyLength = 256; // Note: "padding" only applies to block encryption algorithmns. // Since chacha20 is a stream cipher, there is no padding and the output // number of bytes is exactly equal to the input. // EncodingMode specifies the encoding of the output for // encryption, and the input for decryption. // Valid modes are (case insensitive) "Base64", "modBase64", "Base32", "Base58", "UU", // "QP" (for quoted-printable), "URL" (for url-encoding), "Hex", // "Q", "B", "url_oauth", "url_rfc1738", "url_rfc2396", and "url_rfc3986". $crypt->EncodingMode = 'hex'; // The inputs to ChaCha20 encryption, specified by RFC 7539, are: // 1) A 256-bit secret key. // 2) A 96-bit nonce. // 3) A 32-bit initial count. // The IV property is used to specify the chacha20 nonce. // For a 96-bit nonce, the IV should be 12 bytes in length. // // Note: Some implementations of chacha20, such as that used internally by SSH, // use a 64-bit nonce and 64-bit count. To do chacha20 encryption in this way, // simply provide 8 bytes for the IV instead of 12 bytes. Chilkat will then automatically // use 8 bytes (64-bits) for the count. // This example duplicates Test Vector #3 (for ChaCha20 encryption) from RFC 7539. $ivHex = '000000000000000000000002'; $crypt->SetEncodedIV($ivHex,'hex'); $crypt->InitialCount = 42; $keyHex = '1c9240a5eb55d38af333888604f6b5f0473917c1402b80099dca5cbc207075c0'; $crypt->SetEncodedKey($keyHex,'hex'); $plainText = ''Twas brillig, and the slithy toves\nDid gyre and gimble in the wabe:\nAll mimsy were the borogoves,\nAnd the mome raths outgrabe.'; $encStr = $crypt->encryptStringENC($plainText); print $encStr . "\n"; // Now decrypt: $decStr = $crypt->decryptStringENC($encStr); print $decStr . "\n"; // Here is the Test Vector data copied from RFC 7539 // Test Vector #3: // ============== // // Key: // 000 1c 92 40 a5 eb 55 d3 8a f3 33 88 86 04 f6 b5 f0 ..@..U...3...... // 016 47 39 17 c1 40 2b 80 09 9d ca 5c bc 20 70 75 c0 G9..@+....\. pu. // // Nonce: // 000 00 00 00 00 00 00 00 00 00 00 00 02 ............ // // Initial Block Counter = 42 // // Plaintext: // 000 27 54 77 61 73 20 62 72 69 6c 6c 69 67 2c 20 61 'Twas brillig, a // 016 6e 64 20 74 68 65 20 73 6c 69 74 68 79 20 74 6f nd the slithy to // 032 76 65 73 0a 44 69 64 20 67 79 72 65 20 61 6e 64 ves.Did gyre and // 048 20 67 69 6d 62 6c 65 20 69 6e 20 74 68 65 20 77 gimble in the w // 064 61 62 65 3a 0a 41 6c 6c 20 6d 69 6d 73 79 20 77 abe:.All mimsy w // 080 65 72 65 20 74 68 65 20 62 6f 72 6f 67 6f 76 65 ere the borogove // 096 73 2c 0a 41 6e 64 20 74 68 65 20 6d 6f 6d 65 20 s,.And the mome // 112 72 61 74 68 73 20 6f 75 74 67 72 61 62 65 2e raths outgrabe. // // Ciphertext: // 000 62 e6 34 7f 95 ed 87 a4 5f fa e7 42 6f 27 a1 df b.4....._..Bo'.. // 016 5f b6 91 10 04 4c 0d 73 11 8e ff a9 5b 01 e5 cf _....L.s....[... // 032 16 6d 3d f2 d7 21 ca f9 b2 1e 5f b1 4c 61 68 71 .m=..!...._.Lahq // 048 fd 84 c5 4f 9d 65 b2 83 19 6c 7f e4 f6 05 53 eb ...O.e...l....S. // 064 f3 9c 64 02 c4 22 34 e3 2a 35 6b 3e 76 43 12 a6 ..d.."4.*5k>vC.. // 080 1a 55 32 05 57 16 ea d6 96 25 68 f8 7d 3f 3f 77 .U2.W....%h.}??w // 096 04 c6 a8 d1 bc d1 bf 4d 50 d6 15 4b 6d a7 31 b1 .......MP..Km.1. // 112 87 b5 8d fd 72 8a fa 36 75 7a 79 7a c1 88 d1 ....r..6uzyz.. ?> |
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