Documentation
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Overview ¶
ubc package provides ways for SHA1 blocks to be checked for Unavoidable Bit Conditions that arise from crypto analysis attacks.
Index ¶
Constants ¶
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const ( CheckSize = 80 DV_I_43_0_bit = (uint32)(1 << 0) DV_I_44_0_bit = (uint32)(1 << 1) DV_I_45_0_bit = (uint32)(1 << 2) DV_I_46_0_bit = (uint32)(1 << 3) DV_I_46_2_bit = (uint32)(1 << 4) DV_I_47_0_bit = (uint32)(1 << 5) DV_I_47_2_bit = (uint32)(1 << 6) DV_I_48_0_bit = (uint32)(1 << 7) DV_I_48_2_bit = (uint32)(1 << 8) DV_I_49_0_bit = (uint32)(1 << 9) DV_I_49_2_bit = (uint32)(1 << 10) DV_I_50_0_bit = (uint32)(1 << 11) DV_I_50_2_bit = (uint32)(1 << 12) DV_I_51_0_bit = (uint32)(1 << 13) DV_I_51_2_bit = (uint32)(1 << 14) DV_I_52_0_bit = (uint32)(1 << 15) DV_II_45_0_bit = (uint32)(1 << 16) DV_II_46_0_bit = (uint32)(1 << 17) DV_II_46_2_bit = (uint32)(1 << 18) DV_II_47_0_bit = (uint32)(1 << 19) DV_II_48_0_bit = (uint32)(1 << 20) DV_II_49_0_bit = (uint32)(1 << 21) DV_II_49_2_bit = (uint32)(1 << 22) DV_II_50_0_bit = (uint32)(1 << 23) DV_II_50_2_bit = (uint32)(1 << 24) DV_II_51_0_bit = (uint32)(1 << 25) DV_II_51_2_bit = (uint32)(1 << 26) DV_II_52_0_bit = (uint32)(1 << 27) DV_II_53_0_bit = (uint32)(1 << 28) DV_II_54_0_bit = (uint32)(1 << 29) DV_II_55_0_bit = (uint32)(1 << 30) DV_II_56_0_bit = (uint32)(1 << 31) )
Variables ¶
This section is empty.
Functions ¶
func CalculateDvMask ¶
CalculateDvMask takes as input an expanded message block and verifies the unavoidable bitconditions for all listed DVs. It returns a dvmask where each bit belonging to a DV is set if all unavoidable bitconditions for that DV have been met.
Types ¶
type DvInfo ¶
type DvInfo struct {
// DvType, DvK and DvB define the DV: I(K,B) or II(K,B) (see the paper).
// https://marc-stevens.nl/research/papers/C13-S.pdf
DvType uint32
DvK uint32
DvB uint32
// TestT is the step to do the recompression from for collision detection.
TestT uint32
// MaskI and MaskB define the bit to check for each DV in the dvmask returned by ubc_check.
MaskI uint32
MaskB uint32
// Dm is the expanded message block XOR-difference defined by the DV.
Dm [80]uint32
}
Source Files
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