The dijet production cross section for jets containing a ${b}$-hadron (${b}$-jets)
has been measured in proton--proton collisions
with a centre-of-mass energy of $\sqrt{s}$ = 7 TeV, using the ATLAS
detector at the LHC. The data used correspond to an
integrated luminosity of 4.2 ${\rm{fb}}^{\rm{-1}}$.
The cross section is measured for events with two identified ${b}$-jets with a transverse
momentum $p_\mathrm{T} > 20$ GeV and
a minimum separation in the $\eta$--$\phi$ plane of $\Delta$R = 0.4.
At least one of the jets in the event is required to have $p_\mathrm{T} > 270$ GeV.
The cross section is measured differentially as a function of dijet invariant mass,
dijet transverse momentum, boost of the dijet system, and the rapidity
difference, azimuthal angle and angular distance between the
${b}$-jets.
The results are compared to different predictions of
leading order and next-to-leading order perturbative quantum chromodynamics matrix elements supplemented with models for parton-showers and hadronization.