generate a random private key
| 97 | |
| 98 | // generate a random private key |
| 99 | void InvertibleRWFunction::GenerateRandom(RandomNumberGenerator &rng, const NameValuePairs &alg) |
| 100 | { |
| 101 | int modulusSize = 2048; |
| 102 | alg.GetIntValue("ModulusSize", modulusSize) || alg.GetIntValue("KeySize", modulusSize); |
| 103 | |
| 104 | if (modulusSize < 16) |
| 105 | throw InvalidArgument("InvertibleRWFunction: specified modulus length is too small"); |
| 106 | |
| 107 | AlgorithmParameters primeParam = MakeParametersForTwoPrimesOfEqualSize(modulusSize); |
| 108 | m_p.GenerateRandom(rng, CombinedNameValuePairs(primeParam, MakeParameters("EquivalentTo", 3)("Mod", 8))); |
| 109 | m_q.GenerateRandom(rng, CombinedNameValuePairs(primeParam, MakeParameters("EquivalentTo", 7)("Mod", 8))); |
| 110 | |
| 111 | m_n = m_p * m_q; |
| 112 | m_u = m_q.InverseMod(m_p); |
| 113 | |
| 114 | Precompute(); |
| 115 | } |
| 116 | |
| 117 | void InvertibleRWFunction::Initialize(const Integer &n, const Integer &p, const Integer &q, const Integer &u) |
| 118 | { |