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Fixed a bug in the secp384r1 code. The carry bits were getting put into the wrong place, which would result in incorrect values in about 1/2^32 of cases.

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Ken MacKay
2013-07-25 21:53:53 -07:00
parent 37fe7a2e08
commit 693cb4fc21
1 changed files with 2 additions and 2 deletions
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ecc.c
+2 -2
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@@ -671,8 +671,8 @@ static void omega_mult(uint32_t *p_result, uint32_t *p_right)
{
/* Multiply by (2^128 + 2^96 - 2^32 + 1). */
vli_set(p_result, p_right); /* 1 */
p_result[4 + NUM_ECC_DIGITS] = vli_add(p_result + 3, p_result + 3, p_right); /* 2^96 + 1 */
p_result[5 + NUM_ECC_DIGITS] = vli_add(p_result + 4, p_result + 4, p_right); /* 2^128 + 2^96 + 1 */
p_result[3 + NUM_ECC_DIGITS] = vli_add(p_result + 3, p_result + 3, p_right); /* 2^96 + 1 */
p_result[4 + NUM_ECC_DIGITS] = vli_add(p_result + 4, p_result + 4, p_right); /* 2^128 + 2^96 + 1 */
if(vli_sub(p_result + 1, p_result + 1, p_right)) /* 2^128 + 2^96 - 2^32 + 1 */
{ /* Propagate borrow if necessary. */
uint i;