diff --git a/sample/bench.cpp b/sample/bench.cpp
index 14997f8..4e43020 100644
--- a/sample/bench.cpp
+++ b/sample/bench.cpp
@@ -173,7 +173,7 @@ void benchFromStr16()
 		Fp x;
 		const size_t N = 64;
 		mcl::fp::Unit buf[N];
-		CYBOZU_BENCH("fp:fromStr16", mcl::fp::fromStr16, buf, N, str.c_str(), str.size());
+		CYBOZU_BENCH("fp:hexToArray", mcl::fp::hexToArray, buf, N, str.c_str(), str.size());
 
 		mpz_class y;
 		CYBOZU_BENCH("gmp:setStr  ", mcl::gmp::setStr, y, str, 16);
diff --git a/src/conversion.hpp b/src/conversion.hpp
index 8681048..3c5a036 100644
--- a/src/conversion.hpp
+++ b/src/conversion.hpp
@@ -201,32 +201,6 @@ size_t arrayToBin(char *buf, size_t bufSize, const T *x, size_t n, bool withPref
 	return totalSize;
 }
 
-/*
-	convert hex string to x[0..xn)
-	hex string = [0-9a-fA-F]+
-*/
-template<class T>
-void fromStr16(T *x, size_t xn, const char *str, size_t strLen)
-{
-	if (strLen == 0) throw cybozu::Exception("fp:fromStr16:strLen is zero");
-	const size_t unitLen = sizeof(T) * 2;
-	const size_t q = strLen / unitLen;
-	const size_t r = strLen % unitLen;
-	const size_t requireSize = q + (r ? 1 : 0);
-	if (xn < requireSize) throw cybozu::Exception("fp:fromStr16:short size") << xn << requireSize;
-	for (size_t i = 0; i < q; i++) {
-		bool b;
-		x[i] = cybozu::hextoi(&b, &str[r + (q - 1 - i) * unitLen], unitLen);
-		if (!b) throw cybozu::Exception("fp:fromStr16:bad char") << cybozu::exception::makeString(str, strLen);
-	}
-	if (r) {
-		bool b;
-		x[q] = cybozu::hextoi(&b, str, r);
-		if (!b) throw cybozu::Exception("fp:fromStr16:bad char") << cybozu::exception::makeString(str, strLen);
-	}
-	for (size_t i = requireSize; i < xn; i++) x[i] = 0;
-}
-
 /*
 	convert hex string to x[0..xn)
 	hex string = [0-9a-fA-F]+
diff --git a/test/fp_util_test.cpp b/test/fp_util_test.cpp
index 72e6c7d..c516274 100644
--- a/test/fp_util_test.cpp
+++ b/test/fp_util_test.cpp
@@ -53,7 +53,7 @@ CYBOZU_TEST_AUTO(arrayToBin)
 }
 // CYBOZU_TEST_AUTO(verifyStr) // QQQ
 
-CYBOZU_TEST_AUTO(fromStr16)
+CYBOZU_TEST_AUTO(hexToArray)
 {
 	const struct {
 		const char *str;
@@ -71,10 +71,9 @@ CYBOZU_TEST_AUTO(fromStr16)
 	for (size_t i = 0; i < CYBOZU_NUM_OF_ARRAY(tbl); i++) {
 		const size_t xN = 4;
 		uint64_t x[xN];
-		mcl::fp::fromStr16(x, xN, tbl[i].str, strlen(tbl[i].str));
-		for (size_t j = 0; j < xN; j++) {
-			CYBOZU_TEST_EQUAL(x[j], tbl[i].x[j]);
-		}
+		size_t n = mcl::fp::hexToArray(x, xN, tbl[i].str, strlen(tbl[i].str));
+		CYBOZU_TEST_ASSERT(n > 0);
+		CYBOZU_TEST_EQUAL_ARRAY(x, tbl[i].x, n);
 	}
 }