X-Git-Url: https://www.bearssl.org/gitweb//home/git/?p=BearSSL;a=blobdiff_plain;f=src%2Fec%2Fec_c25519_i15.c;h=8fadcf48039b5c9bca1f04aeab1c1c3ad4817fab;hp=361e75fb14ce6cfeac8fd0f3f61a28036a05de17;hb=946f5bad7683aa79a9f4fcab760206e2aad8c555;hpb=bd3036844bd20b2b8d7bce7fee5ad010ce401915

diff --git a/src/ec/ec_c25519_i15.c b/src/ec/ec_c25519_i15.c
index 361e75f..8fadcf4 100644
--- a/src/ec/ec_c25519_i15.c
+++ b/src/ec/ec_c25519_i15.c
@@ -239,11 +239,11 @@ api_mul(unsigned char *G, size_t Glen,
 	x2[1] = 19;
 	memcpy(z3, x2, ILEN);
 
-	memcpy(k, kb, kblen);
-	memset(k + kblen, 0, (sizeof k) - kblen);
-	k[0] &= 0xF8;
-	k[31] &= 0x7F;
-	k[31] |= 0x40;
+	memset(k, 0, (sizeof k) - kblen);
+	memcpy(k + (sizeof k) - kblen, kb, kblen);
+	k[31] &= 0xF8;
+	k[0] &= 0x7F;
+	k[0] |= 0x40;
 
 	/* obsolete
 	print_int_mont("x1", x1);
@@ -253,7 +253,7 @@ api_mul(unsigned char *G, size_t Glen,
 	for (i = 254; i >= 0; i --) {
 		uint32_t kt;
 
-		kt = (k[i >> 3] >> (i & 7)) & 1;
+		kt = (k[31 - (i >> 3)] >> (i & 7)) & 1;
 		swap ^= kt;
 		cswap(x2, x3, swap);
 		cswap(z2, z3, swap);