X-Git-Url: https://git.distorted.org.uk/u/mdw/putty/blobdiff_plain/7bd5a86050fa6fb39e2928b25f46df4f7dc24600..2d466ffd08675d26db45e524c2fe6a8cf4628e2b:/sshdh.c diff --git a/sshdh.c b/sshdh.c index 0beac6cf..7a1772b8 100644 --- a/sshdh.c +++ b/sshdh.c @@ -34,12 +34,12 @@ static unsigned char G[] = { 2 }; * Variables. */ static Bignum x, e, p, q, qmask, g; -static int need_to_free_pg; /* * Common DH initialisation. */ -static void dh_init(void) { +static void dh_init(void) +{ q = bignum_rshift(p, 1); qmask = bignum_bitmask(q); } @@ -47,7 +47,8 @@ static void dh_init(void) { /* * Initialise DH for the standard group1. */ -void dh_setup_group1(void) { +void dh_setup_group1(void) +{ p = bignum_from_bytes(P, sizeof(P)); g = bignum_from_bytes(G, sizeof(G)); dh_init(); @@ -56,7 +57,8 @@ void dh_setup_group1(void) { /* * Initialise DH for an alternative group. */ -void dh_setup_group(Bignum pval, Bignum gval) { +void dh_setup_group(Bignum pval, Bignum gval) +{ p = copybn(pval); g = copybn(gval); dh_init(); @@ -65,7 +67,8 @@ void dh_setup_group(Bignum pval, Bignum gval) { /* * Clean up. */ -void dh_cleanup(void) { +void dh_cleanup(void) +{ freebn(p); freebn(g); freebn(q); @@ -87,7 +90,8 @@ void dh_cleanup(void) { * Advances in Cryptology: Proceedings of Eurocrypt '96 * Springer-Verlag, May 1996. */ -Bignum dh_create_e(int nbits) { +Bignum dh_create_e(int nbits) +{ int i; int nbytes; @@ -101,8 +105,9 @@ Bignum dh_create_e(int nbits) { * Create a potential x, by ANDing a string of random bytes * with qmask. */ - if (x) freebn(x); - if (nbits == 0 || nbits > ssh1_bignum_bitcount(qmask)) { + if (x) + freebn(x); + if (nbits == 0 || nbits > bignum_bitcount(qmask)) { ssh1_write_bignum(buf, qmask); for (i = 2; i < nbytes; i++) buf[i] &= random_byte(); @@ -110,7 +115,7 @@ Bignum dh_create_e(int nbits) { } else { int b, nb; x = bn_power_2(nbits); - nb = 0; + b = nb = 0; for (i = 0; i < nbits; i++) { if (nb == 0) { nb = 8; @@ -134,7 +139,8 @@ Bignum dh_create_e(int nbits) { /* * DH stage 2: given a number f, compute K = f^x mod p. */ -Bignum dh_find_K(Bignum f) { +Bignum dh_find_K(Bignum f) +{ Bignum ret; ret = modpow(f, x, p); return ret;