diff --git a/src/test/fuzz/CMakeLists.txt b/src/test/fuzz/CMakeLists.txt
--- a/src/test/fuzz/CMakeLists.txt
+++ b/src/test/fuzz/CMakeLists.txt
@@ -93,6 +93,7 @@
 	chain
 	checkqueue
 	coins_view
+	crypto_common
 	cuckoocache
 	descriptor_parse
 	eval_script
diff --git a/src/test/fuzz/crypto_common.cpp b/src/test/fuzz/crypto_common.cpp
new file mode 100644
--- /dev/null
+++ b/src/test/fuzz/crypto_common.cpp
@@ -0,0 +1,76 @@
+// Copyright (c) 2020 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <crypto/common.h>
+
+#include <test/fuzz/FuzzedDataProvider.h>
+#include <test/fuzz/fuzz.h>
+#include <test/fuzz/util.h>
+
+#include <array>
+#include <cassert>
+#include <cstdint>
+#include <cstring>
+#include <vector>
+
+void test_one_input(const std::vector<uint8_t> &buffer) {
+    FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
+    const uint16_t random_u16 =
+        fuzzed_data_provider.ConsumeIntegral<uint16_t>();
+    const uint32_t random_u32 =
+        fuzzed_data_provider.ConsumeIntegral<uint32_t>();
+    const uint64_t random_u64 =
+        fuzzed_data_provider.ConsumeIntegral<uint64_t>();
+    const std::vector<uint8_t> random_bytes_2 =
+        ConsumeFixedLengthByteVector(fuzzed_data_provider, 2);
+    const std::vector<uint8_t> random_bytes_4 =
+        ConsumeFixedLengthByteVector(fuzzed_data_provider, 4);
+    const std::vector<uint8_t> random_bytes_8 =
+        ConsumeFixedLengthByteVector(fuzzed_data_provider, 8);
+
+    std::array<uint8_t, 2> writele16_arr;
+    WriteLE16(writele16_arr.data(), random_u16);
+    assert(ReadLE16(writele16_arr.data()) == random_u16);
+
+    std::array<uint8_t, 4> writele32_arr;
+    WriteLE32(writele32_arr.data(), random_u32);
+    assert(ReadLE32(writele32_arr.data()) == random_u32);
+
+    std::array<uint8_t, 8> writele64_arr;
+    WriteLE64(writele64_arr.data(), random_u64);
+    assert(ReadLE64(writele64_arr.data()) == random_u64);
+
+    std::array<uint8_t, 4> writebe32_arr;
+    WriteBE32(writebe32_arr.data(), random_u32);
+    assert(ReadBE32(writebe32_arr.data()) == random_u32);
+
+    std::array<uint8_t, 8> writebe64_arr;
+    WriteBE64(writebe64_arr.data(), random_u64);
+    assert(ReadBE64(writebe64_arr.data()) == random_u64);
+
+    const uint16_t readle16_result = ReadLE16(random_bytes_2.data());
+    std::array<uint8_t, 2> readle16_arr;
+    WriteLE16(readle16_arr.data(), readle16_result);
+    assert(std::memcmp(random_bytes_2.data(), readle16_arr.data(), 2) == 0);
+
+    const uint32_t readle32_result = ReadLE32(random_bytes_4.data());
+    std::array<uint8_t, 4> readle32_arr;
+    WriteLE32(readle32_arr.data(), readle32_result);
+    assert(std::memcmp(random_bytes_4.data(), readle32_arr.data(), 4) == 0);
+
+    const uint64_t readle64_result = ReadLE64(random_bytes_8.data());
+    std::array<uint8_t, 8> readle64_arr;
+    WriteLE64(readle64_arr.data(), readle64_result);
+    assert(std::memcmp(random_bytes_8.data(), readle64_arr.data(), 8) == 0);
+
+    const uint32_t readbe32_result = ReadBE32(random_bytes_4.data());
+    std::array<uint8_t, 4> readbe32_arr;
+    WriteBE32(readbe32_arr.data(), readbe32_result);
+    assert(std::memcmp(random_bytes_4.data(), readbe32_arr.data(), 4) == 0);
+
+    const uint64_t readbe64_result = ReadBE64(random_bytes_8.data());
+    std::array<uint8_t, 8> readbe64_arr;
+    WriteBE64(readbe64_arr.data(), readbe64_result);
+    assert(std::memcmp(random_bytes_8.data(), readbe64_arr.data(), 8) == 0);
+}
diff --git a/src/test/fuzz/util.h b/src/test/fuzz/util.h
--- a/src/test/fuzz/util.h
+++ b/src/test/fuzz/util.h
@@ -203,4 +203,21 @@
     return false;
 }
 
+/**
+ * Returns a byte vector of specified size regardless of the number of remaining
+ * bytes available from the fuzzer. Pads with zero value bytes if needed to
+ * achieve the specified size.
+ */
+NODISCARD inline std::vector<uint8_t>
+ConsumeFixedLengthByteVector(FuzzedDataProvider &fuzzed_data_provider,
+                             const size_t length) noexcept {
+    std::vector<uint8_t> result(length);
+    const std::vector<uint8_t> random_bytes =
+        fuzzed_data_provider.ConsumeBytes<uint8_t>(length);
+    if (!random_bytes.empty()) {
+        std::memcpy(result.data(), random_bytes.data(), random_bytes.size());
+    }
+    return result;
+}
+
 #endif // BITCOIN_TEST_FUZZ_UTIL_H