X-Git-Url: https://www.bearssl.org/gitweb//home/git/?p=BearSSL;a=blobdiff_plain;f=src%2Fec%2Fec_c25519_m15.c;h=deff55b330b16a4412fa1910b038e11aa9015a2f;hp=03731977cc0cf1f8c02bcd86d2746ac532cd5901;hb=HEAD;hpb=a7e6409c375e008358fc82c80349642d7d54a16c

diff --git a/src/ec/ec_c25519_m15.c b/src/ec/ec_c25519_m15.c
index 0373197..deff55b 100644
--- a/src/ec/ec_c25519_m15.c
+++ b/src/ec/ec_c25519_m15.c
@@ -1332,11 +1332,11 @@ api_mul(unsigned char *G, size_t Glen,
 	memset(z3, 0, sizeof z3);
 	z3[0] = 1;
 
-	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("x1", x1);
@@ -1346,7 +1346,7 @@ 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);