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author | weidai <weidai@57ff6487-cd31-0410-9ec3-f628ee90f5f0> | 2013-01-19 02:20:00 +0000 |
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committer | weidai <weidai@57ff6487-cd31-0410-9ec3-f628ee90f5f0> | 2013-01-19 02:20:00 +0000 |
commit | 6282aab71c9f925b533065e4dbfce632b83ee4ac (patch) | |
tree | 0489fdbd8b1c5c6f87537d4136dcf1afeecb0bd8 /gfpcrypt.cpp | |
parent | 34c4e67c9abc9402c95a6b9533fbbae6b486be63 (diff) | |
download | cryptopp-6282aab71c9f925b533065e4dbfce632b83ee4ac.tar.gz |
add SHA-3
update DSA to FIPS 186-3
update version numbers
git-svn-id: svn://svn.code.sf.net/p/cryptopp/code/trunk/c5@535 57ff6487-cd31-0410-9ec3-f628ee90f5f0
Diffstat (limited to 'gfpcrypt.cpp')
-rw-r--r-- | gfpcrypt.cpp | 38 |
1 files changed, 18 insertions, 20 deletions
diff --git a/gfpcrypt.cpp b/gfpcrypt.cpp index 6d9ffce..e293fc5 100644 --- a/gfpcrypt.cpp +++ b/gfpcrypt.cpp @@ -30,39 +30,37 @@ void DL_GroupParameters_DSA::GenerateRandom(RandomNumberGenerator &rng, const Na if (alg.GetValue("Modulus", p) && alg.GetValue("SubgroupGenerator", g)) { q = alg.GetValueWithDefault("SubgroupOrder", ComputeGroupOrder(p)/2); + Initialize(p, q, g); } else { - int modulusSize = 1024; + int modulusSize = 1024, defaultSubgroupOrderSize; alg.GetIntValue("ModulusSize", modulusSize) || alg.GetIntValue("KeySize", modulusSize); - if (!DSA::IsValidPrimeLength(modulusSize)) - throw InvalidArgument("DSA: not a valid prime length"); - - SecByteBlock seed(SHA::DIGESTSIZE); - Integer h; - int c; - - do + switch (modulusSize) { - rng.GenerateBlock(seed, SHA::DIGESTSIZE); - } while (!DSA::GeneratePrimes(seed, SHA::DIGESTSIZE*8, c, p, modulusSize, q)); + case 1024: + defaultSubgroupOrderSize = 160; + break; + case 2048: + defaultSubgroupOrderSize = 224; + break; + case 3072: + defaultSubgroupOrderSize = 256; + break; + default: + throw InvalidArgument("DSA: not a valid prime length"); + } - do - { - h.Randomize(rng, 2, p-2); - g = a_exp_b_mod_c(h, (p-1)/q, p); - } while (g <= 1); + DL_GroupParameters_GFP::GenerateRandom(rng, CombinedNameValuePairs(alg, MakeParameters(Name::SubgroupOrderSize(), defaultSubgroupOrderSize, false))); } - - Initialize(p, q, g); } bool DL_GroupParameters_DSA::ValidateGroup(RandomNumberGenerator &rng, unsigned int level) const { bool pass = DL_GroupParameters_GFP::ValidateGroup(rng, level); - pass = pass && DSA::IsValidPrimeLength(GetModulus().BitCount()); - pass = pass && GetSubgroupOrder().BitCount() == 160; + int pSize = GetModulus().BitCount(), qSize = GetSubgroupOrder().BitCount(); + pass = pass && ((pSize==1024 && qSize==160) || (pSize==2048 && qSize==224) || (pSize==2048 && qSize==256) || (pSize==3072 && qSize==256)); return pass; } |