PHP :: Doc Bug #81384 :: Secureness of GMP random functions undocumented

Secureness of GMP random functions undocumented

Submitted:

2021-08-26 09:12 UTC

Modified:

2021-08-26 10:33 UTC

Votes:	1
Avg. Score:	1.0 ± 0.0
Reproduced:	1 of 1 (100.0%)
Same Version:	1 (100.0%)
Same OS:	1 (100.0%)

From:

michelbach94 at gmail dot com

Assigned:

Status:

Verified

Package:

GNU MP related

PHP Version:

8.0.9

OS:

any

Private report:

CVE-ID:

None

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From:	michelbach94 at gmail dot com
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New Comment:

[2021-08-26 09:12 UTC] michelbach94 at gmail dot com

Description:
------------
Usually, the documentation of PHP functions that return randomness says whether the respective function is cryptographically secure. However, this is not the case with the GMP randomness functions gmp_random_bits() and gmp_random_range() (nor with the deprecated gmp_random()).

From a Google search, I found that these functions are not cryptographically secure sources of randomness (https://stackoverflow.com/a/56377850). This should be added to the documentation as PHP's GMP implementation being able to handle large numbers is very welcoming to the implementation of cryptographic primitives.

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[2021-08-26 10:33 UTC] cmb@php.net

-Status: Open +Status: Verified

[2021-08-26 10:33 UTC] cmb@php.net

gmp_random_bits(), gmp_random() and gmp_random_range() call
mpz_urandomb() and mpz_urandomm(), respectively, internally, and
these names suggest that urandom is used as source of randomness,
but this is not explicitly documented[1], so possibly that "u"
just refers to the uniform distribution.

So, yes, if in doubt don't use these numbers for cryptographic
purposes.

[1] <https://gmplib.org/manual/Integer-Random-Numbers>

[2023-05-02 18:33 UTC] sethhawks14 at aol dot com

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