diff options
Diffstat (limited to 'common')
| -rw-r--r-- | common/ssl_calls.c | 60 | ||||
| -rw-r--r-- | common/ssl_calls.h | 3 |
2 files changed, 56 insertions, 7 deletions
diff --git a/common/ssl_calls.c b/common/ssl_calls.c index 7840eeb2..4edd68ab 100644 --- a/common/ssl_calls.c +++ b/common/ssl_calls.c @@ -132,8 +132,29 @@ g_md5_complete(void* md5_info, char* data) } /*****************************************************************************/ +static void +reverse_it(char* p, int len) +{ + int i; + int j; + char temp; + + i = 0; + j = len - 1; + while (i < j) + { + temp = p[i]; + p[i] = p[j]; + p[j] = temp; + i++; + j--; + } +} + +/*****************************************************************************/ int -g_mod_exp(char* out, char* in, char* mod, char* exp) +g_mod_exp(char* out, int out_len, char* in, int in_len, + char* mod, int mod_len, char* exp, int exp_len) { BN_CTX* ctx; BIGNUM lmod; @@ -141,21 +162,48 @@ g_mod_exp(char* out, char* in, char* mod, char* exp) BIGNUM lin; BIGNUM lout; int rv; - + char* l_out; + char* l_in; + char* l_mod; + char* l_exp; + + l_out = (char*)g_malloc(out_len, 1); + l_in = (char*)g_malloc(in_len, 1); + l_mod = (char*)g_malloc(mod_len, 1); + l_exp = (char*)g_malloc(exp_len, 1); + g_memcpy(l_in, in, in_len); + g_memcpy(l_mod, mod, mod_len); + g_memcpy(l_exp, exp, exp_len); + reverse_it(l_in, in_len); + reverse_it(l_mod, mod_len); + reverse_it(l_exp, exp_len); ctx = BN_CTX_new(); BN_init(&lmod); BN_init(&lexp); BN_init(&lin); BN_init(&lout); - BN_bin2bn((unsigned char*)mod, 64, &lmod); - BN_bin2bn((unsigned char*)exp, 64, &lexp); - BN_bin2bn((unsigned char*)in, 64, &lin); + BN_bin2bn((unsigned char*)l_mod, 64, &lmod); + BN_bin2bn((unsigned char*)l_exp, 64, &lexp); + BN_bin2bn((unsigned char*)l_in, 64, &lin); BN_mod_exp(&lout, &lin, &lexp, &lmod, ctx); - rv = BN_bn2bin(&lout, (unsigned char*)out); + rv = BN_bn2bin(&lout, (unsigned char*)l_out); + if (rv <= out_len) + { + reverse_it(l_out, rv); + g_memcpy(out, l_out, out_len); + } + else + { + rv = 0; + } BN_free(&lin); BN_free(&lout); BN_free(&lexp); BN_free(&lmod); BN_CTX_free(ctx); + g_free(l_out); + g_free(l_in); + g_free(l_mod); + g_free(l_exp); return rv; } diff --git a/common/ssl_calls.h b/common/ssl_calls.h index 1d736fae..b6b41712 100644 --- a/common/ssl_calls.h +++ b/common/ssl_calls.h @@ -50,6 +50,7 @@ g_md5_transform(void* md5_info, char* data, int len); void g_md5_complete(void* md5_info, char* data); int -g_mod_exp(char* out, char* in, char* mod, char* exp); +g_mod_exp(char* out, int out_len, char* in, int in_len, + char* mod, int mod_len, char* exp, int exp_len); #endif |