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Generate keys more carefully, so that when the user asks for an n-bit

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key they always get an n-bit number instead of n-1. The latter was
perfectly harmless but kept confusing users.

[originally from svn r9421]
This commit is contained in:
Simon Tatham
2012-03-04 00:24:49 +00:00
parent e59f1ac827
commit 9604c2b367
4 changed files with 57 additions and 9 deletions
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6
sshrsag.c
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@ -10,6 +10,7 @@ int rsa_generate(struct RSAKey *key, int bits, progfn_t pfn,
void *pfnparam)
{
Bignum pm1, qm1, phi_n;
unsigned pfirst, qfirst;
/*
* Set up the phase limits for the progress report. We do this
@ -59,10 +60,11 @@ int rsa_generate(struct RSAKey *key, int bits, progfn_t pfn,
* general that's slightly more fiddly to arrange. By choosing
* a prime e, we can simplify the criterion.)
*/
invent_firstbits(&pfirst, &qfirst);
key->p = primegen(bits / 2, RSA_EXPONENT, 1, NULL,
1, pfn, pfnparam);
1, pfn, pfnparam, pfirst);
key->q = primegen(bits - bits / 2, RSA_EXPONENT, 1, NULL,
2, pfn, pfnparam);
2, pfn, pfnparam, qfirst);
/*
* Ensure p > q, by swapping them if not.