[co]fb128.c: fix "n=0" bug.

crypto/modes/cfb128.c

@@ -96,15 +96,15 @@ void CRYPTO_cfb128_encrypt(const unsigned char *in, unsigned char *out,
 #endif
 		while (len>=16) {
 			(*block)(ivec, ivec, key);
-			for (n=0; n<16; n+=sizeof(size_t)) {
+			for (; n<16; n+=sizeof(size_t)) {
 				*(size_t*)(out+n) =
 				*(size_t*)(ivec+n) ^= *(size_t*)(in+n);
 			}
 			len -= 16;
 			out += 16;
 			in  += 16;
-		}
 			n = 0;
+		}
 		if (len) {
 			(*block)(ivec, ivec, key);
 			while (len--) {
@@ -141,7 +141,7 @@ void CRYPTO_cfb128_encrypt(const unsigned char *in, unsigned char *out,
 #endif
 		while (len>=16) {
 			(*block)(ivec, ivec, key);
-			for (n=0; n<16; n+=sizeof(size_t)) {
+			for (; n<16; n+=sizeof(size_t)) {
 				size_t t = *(size_t*)(in+n);
 				*(size_t*)(out+n) = *(size_t*)(ivec+n) ^ t;
 				*(size_t*)(ivec+n) = t;
@@ -149,8 +149,8 @@ void CRYPTO_cfb128_encrypt(const unsigned char *in, unsigned char *out,
 			len -= 16;
 			out += 16;
 			in  += 16;
-		}
 			n = 0;
+		}
 		if (len) {
 			(*block)(ivec, ivec, key);
 			while (len--) {

crypto/modes/ofb128.c

@@ -95,14 +95,14 @@ void CRYPTO_ofb128_encrypt(const unsigned char *in, unsigned char *out,
 #endif
 		while (len>=16) {
 			(*block)(ivec, ivec, key);
-			for (n=0; n<16; n+=sizeof(size_t))
+			for (; n<16; n+=sizeof(size_t))
 				*(size_t*)(out+n) =
 				*(size_t*)(in+n) ^ *(size_t*)(ivec+n);
 			len -= 16;
 			out += 16;
 			in  += 16;
-		}
 			n = 0;
+		}
 		if (len) {
 			(*block)(ivec, ivec, key);
 			while (len--) {