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Jun 12, 2017 Taken from the course 'Build a Complete Registration and Login System using PHP MVC'. How to generate unique, random strings in PHP, and how to create secure hash values of those tokens. Even better: generate the key and email it to the user as you describe. Then hash the key and store that in the database, discarding the original key. When a user attempts to confirm their email address, hash the key provided and compare against the database. – Stephen Touset Mar 16 '14 at 9:05.
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(PHP 7 >= 7.1.2)
hash_hkdf — Generate a HKDF key derivation of a supplied key input
Description
hash_hkdf ( string
$algo
, string$ikm
[, int$length
= 0 [, string$info
= ' [, string$salt
= ' ]]] ) : stringParameters
algo
Name of selected hashing algorithm (i.e. 'sha256', 'sha512', 'haval160,4', etc..) See hash_algos() for a list of supported algorithms.
Note:
Non-cryptographic hash functions are not allowed.
ikm
Input keying material (raw binary). Cannot be empty.
length
Desired output length in bytes. Cannot be greater than 255 times the chosen hash function size.
If
length
is 0, the output length will default to the chosen hash function size. info
Application/context-specific info string.
salt
Salt to use during derivation.
While optional, adding random salt significantly improves the strength of HKDF.
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Return Values
Returns a string containing a raw binary representation of the derived key (also known as output keying material - OKM); or
FALSE
on failure. Errors/Exceptions
An
E_WARNING
will be raised if ikm
is empty, algo
is unknown/non-cryptographic, length
is less than 0 or too large (greater than 255 times the size of the hash function). Examples
Example #1 hash_hkdf() example
<?php
// Generate a random key, and salt to strengthen it during derivation.
$inputKey = random_bytes(32);
$salt = random_bytes(16);
// Derive a pair of separate keys, using the same input created above.
$encryptionKey = hash_hkdf('sha256', $inputKey, 32, 'aes-256-encryption', $salt);
$authenticationKey = hash_hkdf('sha256', $inputKey, 32, 'sha-256-authentication', $salt);
var_dump($encryptionKey ! $authenticationKey); // bool(true)
?>
The above example produces a pair of separate keys, suitable for creation of an encrypt-then-HMAC construct, using AES-256 and SHA-256 for encryption and authentication respectively.
See Also
- hash_pbkdf2() - Generate a PBKDF2 key derivation of a supplied password
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- Hash Functions
This piece of software is provided without warranty of any kind, use it at your own risk.
php 5.4.0 or newer.
php5-gmp needs to be installed.
If you want to launch the test file you need to be under a unix system with libbitcoin intalled on it.
Installation
Best way is to use composer
Alternatively add following snippet in you composer.json
Instanciation
Set a private key
examples of private keys :
4C28FCA386C7A227600B2FE50B7CAE11EC86D3BF1FBE471BE89827E19D72AA1D00FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC
Generate a random private key
The nonce is optional, typically the nonce is a chunck of random data you get from the user. This can be mouse coordinates.Using a nonce adds randomness, which means the generated private key is stronger.
Get the private key
Returns the private key.
Get the Wif
returns the private key under the Wallet Import Format
Get the Public Key
Returns the compressed public key.The compressed PubKey starts with 0x02 if it's y coordinate is even and 0x03 if it's odd, the next 32 bytes corresponds to the x coordinates.
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Example : 0226c50013603b085fbc26411d5d7e564b252d88964eedc4e01251d2d495e92c29
Get the Uncompressed Public Key
Returns the uncompressed PubKey.The uncompressed PubKey starts with 0x04, the next 32 bytes are the x coordinates, the last 32 bytes are the y coordinates.
Example : 04c80e8af3f1b7816a18aa24f242fc0740e9c4027d67c76dacf4ce32d2e5aace241c426fd288a9976ca750f1b192d3acd89dfbeca07ef27f3e5eb5d482354c4249
Get the coordinates of the Public Key
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Returns an array containing the x and y coordinates of the public key
Example :Array ( [x] => a69243f3c4c047aba38d7ac3660317629c957ab1f89ea42343aee186538a34f8 [y] => b6d862f39819060378542a3bb43ff76b5d7bb23fc012f09c3cd2724bebe0b0bd )
Get the Address
Returns the compressed Bitcoin Address.
Get the uncompressed Address
Returns the uncompressed Bitcoin Address.
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Validate an address
Returns true if the address is valid and false if it isn't
Validate a Wif key
Returns true if the WIF key is valid and false if it isn't
Sign a message
Returns a satoshi client standard signed message.
verify a message
Returns true if the signature is matching the address and false if it isn't.
sign a sha256 hash
Returns a DER encoded hexadecimal signature.
verify a signature
Returns true if the signature is matching the public key and false if it isn't.
This is free and unencumbered software released into the public domain.
Anyone is free to copy, modify, publish, use, compile, sell, ordistribute this software, either in source code form or as a compiledbinary, for any purpose, commercial or non-commercial, and by anymeans.
In jurisdictions that recognize copyright laws, the author or authorsof this software dedicate any and all copyright interest in thesoftware to the public domain. We make this dedication for the benefitof the public at large and to the detriment of our heirs andsuccessors. We intend this dedication to be an overt act ofrelinquishment in perpetuity of all present and future rights to thissoftware under copyright law.
THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OFMERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OROTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OROTHER DEALINGS IN THE SOFTWARE.
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