MediaWiki
1.33.0
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Static Public Member Functions | |
static | generate ( $bytes, $context) |
Generate cryptographically random data and return it in raw binary form. More... | |
static | generateHex ( $chars, $context='') |
Generate cryptographically random data and return it in hexadecimal string format. More... | |
static | HKDF ( $hash, $ikm, $salt, $info, $L) |
RFC5869 defines HKDF in 2 steps, extraction and expansion. More... | |
Static Protected Member Functions | |
static | singleton () |
Return a singleton instance, based on the global configs. More... | |
Definition at line 35 of file MWCryptHKDF.php.
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Generate cryptographically random data and return it in raw binary form.
int | $bytes | The number of bytes of random data to generate |
string | $context | String to mix into HMAC context |
Definition at line 85 of file MWCryptHKDF.php.
References $context, and singleton().
Referenced by generateHex().
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Generate cryptographically random data and return it in hexadecimal string format.
See MWCryptRand::realGenerateHex for details of the char-to-byte conversion logic.
int | $chars | The number of hex chars of random data to generate |
string | $context | String to mix into HMAC context |
Definition at line 97 of file MWCryptHKDF.php.
References $context, and generate().
Referenced by MWCryptHKDFTest\testGenerate().
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RFC5869 defines HKDF in 2 steps, extraction and expansion.
From http://eprint.iacr.org/2010/264.pdf:
The scheme HKDF is specifed as: HKDF(XTS, SKM, CTXinfo, L) = K(1) || K(2) || ... || K(t) where the values K(i) are defined as follows: PRK = HMAC(XTS, SKM) K(1) = HMAC(PRK, CTXinfo || 0); K(i+1) = HMAC(PRK, K(i) || CTXinfo || i), 1 <= i < t; where t = [L/k] and the value K(t) is truncated to its first d = L mod k bits; the counter i is non-wrapping and of a given fixed size, e.g., a single byte. Note that the length of the HMAC output is the same as its key length and therefore the scheme is well defined.
XTS is the "extractor salt" SKM is the "secret keying material"
N.B. http://eprint.iacr.org/2010/264.pdf seems to differ from RFC 5869 in that the test vectors from RFC 5869 only work if K(0) = '' and K(1) = HMAC(PRK, K(0) || CTXinfo || 1)
string | $hash | The hashing function to use (e.g., sha256) |
string | $ikm | The input keying material |
string | $salt | The salt to add to the ikm, to get the prk |
string | $info | Optional context (change the output without affecting the randomness properties of the output) |
int | $L | Number of bytes to return |
Definition at line 74 of file MWCryptHKDF.php.
References CryptHKDF\HKDF().
Referenced by MWCryptHKDFTest\testRfc5869().
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staticprotected |
Return a singleton instance, based on the global configs.
Definition at line 41 of file MWCryptHKDF.php.
Referenced by generate().