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Added some private key nullification so that they won't be uncontrolled in the stack

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This commit is contained in:
netanelkl 2015-04-08 15:07:15 -04:00
parent a757693fe3
commit aeefea054a
1 changed files with 31 additions and 7 deletions
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38
bip32.c
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@ -32,6 +32,8 @@
#include "ripemd160.h" #include "ripemd160.h"
#include "base58.h" #include "base58.h"
#define MEMSET_BZERO(p,l) memset((p), 0, (l))
int hdnode_from_xpub(uint32_t depth, uint32_t fingerprint, uint32_t child_num, const uint8_t *chain_code, const uint8_t *public_key, HDNode *out) int hdnode_from_xpub(uint32_t depth, uint32_t fingerprint, uint32_t child_num, const uint8_t *chain_code, const uint8_t *public_key, HDNode *out)
{ {
if (public_key[0] != 0x02 && public_key[0] != 0x03) { // invalid pubkey if (public_key[0] != 0x02 && public_key[0] != 0x03) { // invalid pubkey
@ -41,7 +43,7 @@ int hdnode_from_xpub(uint32_t depth, uint32_t fingerprint, uint32_t child_num, c
out->fingerprint = fingerprint; out->fingerprint = fingerprint;
out->child_num = child_num; out->child_num = child_num;
memcpy(out->chain_code, chain_code, 32); memcpy(out->chain_code, chain_code, 32);
memset(out->private_key, 0, 32); MEMSET_BZERO(out->private_key, 32);
memcpy(out->public_key, public_key, 33); memcpy(out->public_key, public_key, 33);
return 1; return 1;
} }
@ -50,9 +52,20 @@ int hdnode_from_xprv(uint32_t depth, uint32_t fingerprint, uint32_t child_num, c
{ {
bignum256 a; bignum256 a;
bn_read_be(private_key, &a); bn_read_be(private_key, &a);
if (bn_is_zero(&a) || !bn_is_less(&a, &order256k1)) { // == 0 or >= order
bool failed = false;
if (bn_is_zero(&a)) {
failed = true;
}
else if( !bn_is_less(&a, &order256k1)) { // == 0 or >= order
MEMSET_BZERO(&a,sizeof(a));
failed = true;
}
if(failed) {
return 0; return 0;
} }
out->depth = depth; out->depth = depth;
out->fingerprint = fingerprint; out->fingerprint = fingerprint;
out->child_num = child_num; out->child_num = child_num;
@ -73,12 +86,23 @@ int hdnode_from_seed(const uint8_t *seed, int seed_len, HDNode *out)
memcpy(out->private_key, I, 32); memcpy(out->private_key, I, 32);
bignum256 a; bignum256 a;
bn_read_be(out->private_key, &a); bn_read_be(out->private_key, &a);
if (bn_is_zero(&a) || !bn_is_less(&a, &order256k1)) { // == 0 or >= order
return 0; bool failed = false;
if (bn_is_zero(&a)) {
failed = true;
} }
memcpy(out->chain_code, I + 32, 32); else if( !bn_is_less(&a, &order256k1)) { // == 0 or >= order
hdnode_fill_public_key(out); MEMSET_BZERO(&a,sizeof(a));
return 1; failed = true;
}
if(!failed) {
memcpy(out->chain_code, I + 32, 32);
hdnode_fill_public_key(out);
}
MEMSET_BZERO(I,sizeof(I));
return failed ? 0 : 1;
} }
int hdnode_private_ckd(HDNode *inout, uint32_t i) int hdnode_private_ckd(HDNode *inout, uint32_t i)