diff --git a/include/libeosio/ec.hpp b/include/libeosio/ec.hpp
index 07249ca..bea3a30 100644
--- a/include/libeosio/ec.hpp
+++ b/include/libeosio/ec.hpp
@@ -101,6 +101,22 @@ int ec_get_publickey(const ec_privkey_t *priv, ec_pubkey_t* pub);
  */
 int ec_generate_key(struct ec_keypair *pair);
 
+
+/**
+ * Sign
+ */
+
+/**
+ * Create a ECDSA signature, returns -1 if an error occured or zero on success.
+ */
+int ecdsa_sign(const ec_privkey_t& key, const sha256_t* digest, ec_signature_t& sig);
+
+/**
+ * Verify an ECDSA signature,
+ * returns zero if the signature is correct. -1 if the signature is incorrect or an error occured.
+ */
+int ecdsa_verify(const sha256_t* digest, const ec_signature_t& sig, const ec_pubkey_t& key);
+
 /**
  * Shutdown the ec library.
  */
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 73b1523..d04ae9b 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -5,6 +5,8 @@ set(TEST_SRC
 	# ec
 	ec/generate.cpp
 	ec/pubkey.cpp
+	ec/ecdsa_sign.cpp
+	ec/ecdsa_verify.cpp
 
 	# Base58
 	base58/encode.cpp
diff --git a/tests/ec/ecdsa_sign.cpp b/tests/ec/ecdsa_sign.cpp
new file mode 100644
index 0000000..e6b6902
--- /dev/null
+++ b/tests/ec/ecdsa_sign.cpp
@@ -0,0 +1,143 @@
+#include <libeosio/ec.hpp>
+#include <vector>
+#include <doctest.h>
+
+TEST_CASE("ec::ecdsa_sign") {
+
+	struct testcase {
+		const char *name;
+		libeosio::ec_privkey_t key;
+		libeosio::sha256_t dgst;
+		libeosio::ec_signature_t expected;
+	};
+
+	std::vector<testcase> tests = {
+		{
+			"valid #1",
+			// Private Key: 5Ke4YqL2TCtiUTTA1CVMXSrrEHuK9HzbUSWX791yC2UaX2dWRDw
+			{ 0xf0, 0x2d, 0x00, 0x72, 0x8a, 0x7a, 0x93, 0x86, 0xaf, 0xbe, 0x19, 0xab, 0x79, 0x8c, 0xa1, 0x61, 0xab, 0x96, 0x74, 0x7f, 0xe5, 0x97, 0x19, 0x07, 0xb1, 0xc8, 0x65, 0x63, 0xc8, 0x11, 0xe6, 0x74 },
+			{
+				data: {
+					0xab, 0x53, 0x0a, 0x13, 0xe4, 0x59, 0x14, 0x98,
+					0x2b, 0x79, 0xf9, 0xb7, 0xe3, 0xfb, 0xa9, 0x94,
+					0xcf, 0xd1, 0xf3, 0xfb, 0x22, 0xf7, 0x1c, 0xea,
+					0x1a, 0xfb, 0xf0, 0x2b, 0x46, 0x0c, 0x6d, 0x1d
+				},
+			},
+			// SIG_K1_KdgBih1poWj8DYZXwLxMdjaHMzYhuAVp7XshR9ZjrZSubZwsgSpiyUKXu44NmCtKgRFswmqKaioWLTuGZrXwYPsSNCSyyr
+			{
+				0x20, 0x44, 0x3f, 0x72, 0x22, 0xfd, 0x7a, 0x1f, 0x56, 0x2d, 0xef, 0x01, 0x55, 0x40, 0xcf, 0x50, 0x6f, 0x5f, 0xdd, 0xfe, 0x71, 0xd7, 0x18, 0xc9, 0xa8, 0xc8, 0xbe, 0x00, 0x96, 0xf8, 0x7c, 0xc7,
+				0x1f, 0x2d, 0xd0, 0xd1, 0xfc, 0x4a, 0x22, 0x6a, 0x25, 0xc4, 0x7c, 0x99, 0xf9, 0xd8, 0x30, 0xfa, 0x8b, 0x5c, 0x33, 0x36, 0x61, 0xd7, 0xcf, 0x6d, 0x04, 0x97, 0x61, 0x76, 0x47, 0x65, 0x30, 0x7b,
+				0x66
+			},
+		},
+		{
+			"valid #2",
+			// Private Key: 5J1VLF3TtdM3FiaUZNjeUXTUmVmRRULSdxrGf3XwQkRAZLcN64b
+			{ 0x19, 0x6f, 0xd7, 0xa5, 0x3f, 0xab, 0x59, 0x8e, 0xa5, 0xef, 0xec, 0x79, 0xdd, 0xbc, 0x49, 0xae, 0xef, 0xff, 0x41, 0x3c, 0x5f, 0xfe, 0x50, 0x3a, 0x66, 0xbc, 0xff, 0xf1, 0x32, 0x1b, 0x8c, 0x2f },
+			{
+				data: {
+					0x19, 0xd3, 0xe0, 0x8b, 0xbb, 0xad, 0x5f, 0x02,
+					0x35, 0xa8, 0xa8, 0xf8, 0x1a, 0x7f, 0xa1, 0xe0,
+					0xf8, 0x50, 0xdd, 0x39, 0x12, 0xe3, 0xc6, 0x55,
+					0xb4, 0x35, 0xd4, 0x78, 0x6b, 0x93, 0x64, 0xa6
+				},
+			},
+			// SIG_K1_K4XXx6oSYBzcwzscMstvSxruxdkTCinyN9dnRo4DuBkCCpQbCJQcJmbE7aAmNueBYCccHyyDK5JDfMpvewRF2rGUFtSE2y
+			{
+				0x1f, 0x46, 0xde, 0x7a, 0x7e, 0x87, 0xa7, 0xb0, 0x42, 0xce, 0xdc, 0x57, 0xc9, 0x0d, 0x64, 0x4c, 0xc7, 0x4d, 0xe6, 0x19, 0x5d, 0x34, 0x4e, 0xba, 0xfb, 0xdf, 0x26, 0x79, 0xa1, 0xc6, 0x99, 0x98,
+				0xa7, 0x1f, 0x65, 0xcd, 0xab, 0x2d, 0x19, 0x75, 0x27, 0xdc, 0xb2, 0xc5, 0x46, 0x87, 0x5d, 0xbe, 0xc5, 0x8d, 0xb2, 0xb8, 0x7f, 0x15, 0x47, 0xd7, 0xc7, 0x94, 0x0a, 0xd5, 0x52, 0xd9, 0xe3, 0x93,
+				0xd7
+			},
+		},
+		{
+			"valid #3",
+			// Private Key: 5Hz2iVzC9jDcBUGo2EUSPdcvL1s8jxJ6pY95gQX59mHoHx6zi6W
+			{ 0x16, 0x1f, 0xd0, 0x41, 0x21, 0x50, 0x04, 0x13, 0x90, 0x61, 0xb3, 0xbd, 0xc8, 0x83, 0x09, 0xf0, 0x80, 0x3c, 0x90, 0x45, 0x8e, 0x9a, 0x8c, 0xb2, 0xfb, 0x6a, 0x3c, 0x27, 0x51, 0xcf, 0xd9, 0xca },
+			{
+				data: {
+					0x1b, 0x01, 0x0b, 0xe5, 0xce, 0x6a, 0x49, 0xc7,
+					0xcd, 0x04, 0x86, 0x0d, 0xef, 0x63, 0x1c, 0x6a,
+					0xcc, 0xd5, 0x17, 0x47, 0x2e, 0x74, 0x5b, 0xa6,
+					0xc8, 0xaf, 0x26, 0x1b, 0x15, 0x7e, 0x11, 0xec
+				},
+			},
+			// SIG_K1_K54CVeQjFREm9Z92jutWESZWb9WQfCRZ2KfMtisfsnxedppeSMxTrZ9fYDLiJTfE79zvLCHb5NysAEcNdh7HiBvtU4Ahhh
+			{
+				0x1f, 0x4a, 0xe9, 0x04, 0x20, 0xfa, 0x7b, 0x9d, 0x56, 0xc6, 0x00, 0x5c, 0x83, 0x70, 0xa9, 0x26, 0x41, 0x7d, 0xe8, 0xeb, 0xe7, 0x75, 0xea, 0x6f, 0x75, 0xa7, 0x7c, 0x98, 0x10, 0x27, 0xbf, 0xce,
+				0x48, 0x41, 0x74, 0xb0, 0xe3, 0xb1, 0x4b, 0x06, 0x2c, 0x53, 0x93, 0xbc, 0x35, 0xea, 0xac, 0xd7, 0x9e, 0x07, 0xa7, 0xa1, 0x2e, 0xac, 0xa0, 0x81, 0x45, 0xdb, 0xd4, 0x53, 0x68, 0xda, 0xaa, 0xc6,
+				0xfc
+			},
+		},
+		{
+			"valid #4",
+			// Private Key: 5KbH8qYyg6f93gHuAdbDmwCVMoarXHqEn5CdbW2VtHTyMsLShwM
+			{ 0xe9, 0xdb, 0x4d, 0xdc, 0x8e, 0x08, 0xd2, 0x04, 0x75, 0xc2, 0xb6, 0xf7, 0x14, 0x9e, 0xa2, 0x16, 0xd7, 0x2b, 0x34, 0x3b, 0xba, 0xb4, 0x7d, 0xe6, 0xd3, 0x96, 0xc1, 0x63, 0x82, 0xdf, 0x2d, 0x13 },
+			{
+				data: {
+					0xbc, 0x83, 0xbe, 0xe1, 0x73, 0x82, 0xfb, 0x02,
+					0x71, 0x25, 0x3b, 0xf5, 0x39, 0x32, 0x55, 0x4e,
+					0x01, 0x28, 0x5d, 0xf4, 0x02, 0xe8, 0xa2, 0x92,
+					0x04, 0xf2, 0x95, 0xbc, 0xfa, 0xed, 0x8f, 0xaa
+				},
+			},
+			// SIG_K1_K56oByqkwGeRhn8TfiWdspSzmNy99McLeQ7R9UFJzKgQWjAXVV4hAf1ophqs4RGtBzBTaWA1oQyaWUfPr84VcbzMqLc5H5
+			{
+				0x1f, 0x4b, 0x40, 0xac, 0x12, 0x8c, 0xb1, 0x78, 0xe0, 0xe3, 0x09, 0xe5, 0x74, 0x3e, 0xe5, 0xd2, 0xf4, 0x46, 0xaa, 0x14, 0x68, 0x39, 0x97, 0xc4, 0x4f, 0x92, 0x03, 0x3a, 0x72, 0x4d, 0x68, 0xe5,
+				0x03, 0x71, 0xa7, 0xd9, 0x41, 0x61, 0xec, 0x5a, 0xe4, 0xb5, 0x3a, 0xa9, 0xc7, 0xd4, 0x93, 0x44, 0x6e, 0xb1, 0xe1, 0x66, 0x13, 0xc9, 0x2d, 0x74, 0x82, 0xc9, 0x42, 0x55, 0xef, 0x21, 0x1d, 0x22,
+				0xe3
+			},
+		},
+		{
+			"valid #5",
+			// Private Key: 5KUb7Y5UqoVggesYJzuNcEmjGtQMpfMiVaEDr9E5K1vNgZqvHok
+			{ 0xda, 0xaa, 0x85, 0x66, 0xf5, 0xc9, 0x4c, 0xfa, 0x1f, 0x72, 0x30, 0x8e, 0xb8, 0xed, 0x8c, 0xd7, 0x2b, 0x08, 0x80, 0xc8, 0x2b, 0x9d, 0xe9, 0x0a, 0x81, 0xec, 0x8f, 0x3e, 0xe7, 0x75, 0xf0, 0x3c },
+			{
+				data: {
+					0xfc, 0xb2, 0x0d, 0xa1, 0x22, 0x6c, 0xcc, 0x59,
+					0x26, 0x66, 0xba, 0x57, 0xeb, 0x4a, 0xfa, 0x20,
+					0xff, 0x40, 0x7b, 0xc7, 0x3c, 0x35, 0xb8, 0xaa,
+					0x72, 0x3e, 0x94, 0xcc, 0x05, 0xe1, 0x51, 0xc7
+				},
+			},
+			// SIG_K1_KcU7REFtK9uNhrstdi2WrvF4mBsAKQjvUsSbL4zDWywz3FTNbNMQq1g8bKNEkmD22AH2dDEAPBkLqDYERk38gJygG3wJCx
+			{
+				0x20, 0x3b, 0x03, 0x56, 0x1d, 0x99, 0xca, 0xcd, 0xb4, 0xfe, 0x8a, 0x55, 0x0a, 0x88, 0xe1, 0x84, 0x2b, 0x73, 0xd4, 0x7e, 0x8a, 0x5b, 0x07, 0xe4, 0xe4, 0x38, 0x70, 0x7f, 0x5d, 0xcc, 0x6a, 0xe2,
+				0x5b, 0x1a, 0x37, 0xa2, 0x5b, 0x04, 0xaa, 0x55, 0xa6, 0x43, 0x75, 0x1b, 0x86, 0x20, 0x8a, 0xd3, 0xf8, 0xb0, 0xcd, 0x92, 0x30, 0x2b, 0x3b, 0xf9, 0xdc, 0x52, 0x39, 0xf8, 0xdd, 0xe7, 0xfe, 0xff,
+				0x35
+			},
+		},
+		{
+			"valid #6",
+			// Private Key: 5K4ErsLWnMv53tfFhtp5JF9CYKwmr89Pt2BEpoak1bfdgvHK2fj
+			{ 0xa3, 0x60, 0xd7, 0x80, 0xdc, 0xe8, 0x3c, 0x5d, 0xc8, 0x61, 0xa1, 0x24, 0x6f, 0x65, 0x9e, 0x16, 0x79, 0x40, 0x10, 0x27, 0xfc, 0x9a, 0x40, 0x3f, 0x2b, 0x40, 0x7a, 0xfd, 0x1e, 0x42, 0xde, 0x84 },
+			{
+				data: {
+					0xd2, 0xfa, 0xa6, 0x97, 0x12, 0xd7, 0x04, 0x05,
+					0xe8, 0x60, 0x7e, 0x86, 0x73, 0x69, 0x05, 0x90,
+					0x97, 0xa2, 0x57, 0xee, 0x12, 0x4b, 0x80, 0x13,
+					0x04, 0xfa, 0x7d, 0x70, 0xe7, 0xdc, 0x86, 0xb2
+				},
+			},
+			// SIG_K1_KmHSJGQmFPVWqs48hF2YTWm51wS6CU4jobLPjKTyrCeGvwmt1YHLGgkPnENEgujvpJLYRGbffwtfqzPdDtSUXeBDAATKAH
+			{
+				0x20, 0x69, 0x9f, 0x82, 0x48, 0xd6, 0x57, 0x42, 0x1f, 0xd6, 0x76, 0x15, 0x4c, 0xb1, 0x9c, 0xd7, 0x04, 0x1d, 0xb7, 0xed, 0x1b, 0xff, 0x26, 0xbd, 0x2e, 0xc3, 0x65, 0xbf, 0xcb, 0xfb, 0x9b, 0xae,
+				0xe5, 0x77, 0x69, 0x23, 0xa8, 0xda, 0x84, 0x1c, 0x2f, 0x03, 0x95, 0x48, 0x33, 0x95, 0x85, 0xdf, 0x43, 0x69, 0xd4, 0x17, 0x37, 0x24, 0x86, 0xdf, 0x81, 0x08, 0xab, 0x81, 0xc4, 0x2c, 0xde, 0x61,
+				0x4a
+			},
+		},
+	};
+
+	libeosio::ec_init();
+
+	for(auto it = tests.begin(); it != tests.end(); it++) {
+		SUBCASE(it->name) {
+			libeosio::ec_signature_t result;
+
+			CHECK( libeosio::ecdsa_sign(it->key, &it->dgst, result) == 0 );
+			CHECK( result == it->expected );
+		}
+	}
+	libeosio::ec_shutdown();
+}
+
diff --git a/tests/ec/ecdsa_verify.cpp b/tests/ec/ecdsa_verify.cpp
new file mode 100644
index 0000000..e50556f
--- /dev/null
+++ b/tests/ec/ecdsa_verify.cpp
@@ -0,0 +1,149 @@
+#include <libeosio/ec.hpp>
+#include <libeosio/WIF.hpp>
+#include <vector>
+#include <doctest.h>
+
+TEST_CASE("ec::ecdsa_sign") {
+
+	struct testcase {
+		const char *name;
+		libeosio::sha256_t dgst;
+		libeosio::ec_pubkey_t pubkey;
+		libeosio::ec_signature_t sig;
+		int expected;
+	};
+
+	std::vector<testcase> tests = {
+		{
+			"valid #1",
+			{
+				data: {
+					0xab, 0x53, 0x0a, 0x13, 0xe4, 0x59, 0x14, 0x98,
+					0x2b, 0x79, 0xf9, 0xb7, 0xe3, 0xfb, 0xa9, 0x94,
+					0xcf, 0xd1, 0xf3, 0xfb, 0x22, 0xf7, 0x1c, 0xea,
+					0x1a, 0xfb, 0xf0, 0x2b, 0x46, 0x0c, 0x6d, 0x1d
+				},
+			},
+			// Public Key: EOS6zjfj9Xjk9CYoucZDptdDZ6317eZd622pVvaYtv5q6gwEs9icD
+			{ 0x03, 0x15, 0x93, 0x8a, 0x8e, 0x1d, 0x57, 0x84, 0x9f, 0xab, 0x07, 0x18, 0x67, 0xb5, 0x0c, 0xda, 0xb0, 0x77, 0x62, 0x29, 0xb6, 0x43, 0xb8, 0x67, 0x56, 0xc7, 0xb3, 0xe8, 0x7f, 0xe6, 0x08, 0xf8, 0x4b },
+			// SIG_K1_KdgBih1poWj8DYZXwLxMdjaHMzYhuAVp7XshR9ZjrZSubZwsgSpiyUKXu44NmCtKgRFswmqKaioWLTuGZrXwYPsSNCSyyr
+			{
+				0x20, 0x44, 0x3f, 0x72, 0x22, 0xfd, 0x7a, 0x1f, 0x56, 0x2d, 0xef, 0x01, 0x55, 0x40, 0xcf, 0x50, 0x6f, 0x5f, 0xdd, 0xfe, 0x71, 0xd7, 0x18, 0xc9, 0xa8, 0xc8, 0xbe, 0x00, 0x96, 0xf8, 0x7c, 0xc7,
+				0x1f, 0x2d, 0xd0, 0xd1, 0xfc, 0x4a, 0x22, 0x6a, 0x25, 0xc4, 0x7c, 0x99, 0xf9, 0xd8, 0x30, 0xfa, 0x8b, 0x5c, 0x33, 0x36, 0x61, 0xd7, 0xcf, 0x6d, 0x04, 0x97, 0x61, 0x76, 0x47, 0x65, 0x30, 0x7b,
+				0x66
+			},
+			0
+		},
+		{
+			"valid #2",
+			{
+				data: {
+					0x19, 0xd3, 0xe0, 0x8b, 0xbb, 0xad, 0x5f, 0x02,
+					0x35, 0xa8, 0xa8, 0xf8, 0x1a, 0x7f, 0xa1, 0xe0,
+					0xf8, 0x50, 0xdd, 0x39, 0x12, 0xe3, 0xc6, 0x55,
+					0xb4, 0x35, 0xd4, 0x78, 0x6b, 0x93, 0x64, 0xa6
+				},
+			},
+			// Public Key: EOS6tVtKhTpM6yU7kkiRz1AecDJPcBQo2w4x4oytJbJi5PMV2Rcw2
+			{ 0x03, 0x07, 0x69, 0xbb, 0xa5, 0x2c, 0xd2, 0xe1, 0x3b, 0x3e, 0x0a, 0x40, 0xb3, 0xa2, 0x44, 0xad, 0x71, 0x6e, 0x32, 0x64, 0x9c, 0x3a, 0x64, 0x27, 0x4f, 0x31, 0x86, 0x8a, 0x4c, 0x69, 0x58, 0x86, 0x49 },
+			// SIG_K1_K4XXx6oSYBzcwzscMstvSxruxdkTCinyN9dnRo4DuBkCCpQbCJQcJmbE7aAmNueBYCccHyyDK5JDfMpvewRF2rGUFtSE2y
+			{
+				0x1f, 0x46, 0xde, 0x7a, 0x7e, 0x87, 0xa7, 0xb0, 0x42, 0xce, 0xdc, 0x57, 0xc9, 0x0d, 0x64, 0x4c, 0xc7, 0x4d, 0xe6, 0x19, 0x5d, 0x34, 0x4e, 0xba, 0xfb, 0xdf, 0x26, 0x79, 0xa1, 0xc6, 0x99, 0x98,
+				0xa7, 0x1f, 0x65, 0xcd, 0xab, 0x2d, 0x19, 0x75, 0x27, 0xdc, 0xb2, 0xc5, 0x46, 0x87, 0x5d, 0xbe, 0xc5, 0x8d, 0xb2, 0xb8, 0x7f, 0x15, 0x47, 0xd7, 0xc7, 0x94, 0x0a, 0xd5, 0x52, 0xd9, 0xe3, 0x93,
+				0xd7
+			},
+			0
+		},
+		{
+			"valid #3",
+			{
+				data: {
+					0x1b, 0x01, 0x0b, 0xe5, 0xce, 0x6a, 0x49, 0xc7,
+					0xcd, 0x04, 0x86, 0x0d, 0xef, 0x63, 0x1c, 0x6a,
+					0xcc, 0xd5, 0x17, 0x47, 0x2e, 0x74, 0x5b, 0xa6,
+					0xc8, 0xaf, 0x26, 0x1b, 0x15, 0x7e, 0x11, 0xec
+				},
+			},
+			// Public Key: EOS7Xtaa4y44gYapth4MH5bdtCvdtQvVLdsW7a8thVAuvNAkj8X7i
+			{ 0x03, 0x5c, 0x50, 0x81, 0xef, 0xa6, 0x46, 0x00, 0x5a, 0xb9, 0xd8, 0x2b, 0xfe, 0xd8, 0xe1, 0x6d, 0x15, 0x42, 0x9e, 0x9a, 0xcb, 0xc9, 0xd6, 0xb3, 0x2e, 0x5a, 0xe3, 0xed, 0xa5, 0x8d, 0x6a, 0x42, 0x6c },
+			// SIG_K1_K54CVeQjFREm9Z92jutWESZWb9WQfCRZ2KfMtisfsnxedppeSMxTrZ9fYDLiJTfE79zvLCHb5NysAEcNdh7HiBvtU4Ahhh
+			{
+				0x1f, 0x4a, 0xe9, 0x04, 0x20, 0xfa, 0x7b, 0x9d, 0x56, 0xc6, 0x00, 0x5c, 0x83, 0x70, 0xa9, 0x26, 0x41, 0x7d, 0xe8, 0xeb, 0xe7, 0x75, 0xea, 0x6f, 0x75, 0xa7, 0x7c, 0x98, 0x10, 0x27, 0xbf, 0xce,
+				0x48, 0x41, 0x74, 0xb0, 0xe3, 0xb1, 0x4b, 0x06, 0x2c, 0x53, 0x93, 0xbc, 0x35, 0xea, 0xac, 0xd7, 0x9e, 0x07, 0xa7, 0xa1, 0x2e, 0xac, 0xa0, 0x81, 0x45, 0xdb, 0xd4, 0x53, 0x68, 0xda, 0xaa, 0xc6,
+				0xfc
+			},
+			0
+		},
+		{
+			"not valid #1",
+			{
+				data: {
+					0xde, 0x01, 0x64, 0x03, 0x39, 0x01, 0x66, 0x8b,
+					0xa0, 0x39, 0xef, 0x31, 0x61, 0xc7, 0xc8, 0x9d,
+					0x15, 0x4b, 0xc6, 0x7b, 0x99, 0x5c, 0xba, 0x9b,
+					0x23, 0x8a, 0x76, 0x4b, 0x81, 0xf2, 0xff, 0xeb
+				},
+			},
+			// Public Key: EOS7Xtaa4y44gYapth4MH5bdtCvdtQvVLdsW7a8thVAuvNAkj8X7i
+			{ 0x03, 0x5c, 0x50, 0x81, 0xef, 0xa6, 0x46, 0x00, 0x5a, 0xb9, 0xd8, 0x2b, 0xfe, 0xd8, 0xe1, 0x6d, 0x15, 0x42, 0x9e, 0x9a, 0xcb, 0xc9, 0xd6, 0xb3, 0x2e, 0x5a, 0xe3, 0xed, 0xa5, 0x8d, 0x6a, 0x42, 0x6c },
+			// SIG_K1_K54CVeQjFREm9Z92jutWESZWb9WQfCRZ2KfMtisfsnxedppeSMxTrZ9fYDLiJTfE79zvLCHb5NysAEcNdh7HiBvtU4Ahhh
+			{
+				0x1f, 0x4a, 0xe9, 0x04, 0x20, 0xfa, 0x7b, 0x9d, 0x56, 0xc6, 0x00, 0x5c, 0x83, 0x70, 0xa9, 0x26, 0x41, 0x7d, 0xe8, 0xeb, 0xe7, 0x75, 0xea, 0x6f, 0x75, 0xa7, 0x7c, 0x98, 0x10, 0x27, 0xbf, 0xce,
+				0x48, 0x41, 0x74, 0xb0, 0xe3, 0xb1, 0x4b, 0x06, 0x2c, 0x53, 0x93, 0xbc, 0x35, 0xea, 0xac, 0xd7, 0x9e, 0x07, 0xa7, 0xa1, 0x2e, 0xac, 0xa0, 0x81, 0x45, 0xdb, 0xd4, 0x53, 0x68, 0xda, 0xaa, 0xc6,
+				0xfc
+			},
+			-1
+		},
+		{
+			"not valid #2",
+			{
+				data: {
+					0xa7, 0xf7, 0x89, 0x36, 0xea, 0xb7, 0x95, 0xa7,
+					0x71, 0xaa, 0x73, 0xb5, 0xf6, 0xb8, 0xa0, 0x40,
+					0xe5, 0x4f, 0xb3, 0x87, 0xff, 0xd9, 0xb6, 0x4e,
+					0x30, 0x4c, 0xa3, 0x78, 0xab, 0x68, 0x86, 0x24
+				},
+			},
+			// EOS5AxTzvLZ7mRPvo1Ju9nCdB31PruYHE9uar8pF6D3CvZQGWcHq8
+			{ 0x02, 0x25, 0x64, 0x31, 0x9d, 0x41, 0x46, 0x82, 0xeb, 0x60, 0xed, 0x17, 0xe9, 0x8a, 0xd1, 0x21, 0x60, 0xc4, 0x65, 0xe7, 0x7e, 0x73, 0x2e, 0x45, 0xf0, 0x78, 0x8b, 0x7f, 0x43, 0x30, 0x71, 0xbc, 0x34 },
+			// SIG_K1_K4QgBwbwAP879cjV66LjPmEBoVA3FXesYp6KxRbbshVeQRSJmgreFkBYx3eBTHNdJx2dxZatx9sRJvwh1JY2F2U6APmHKE
+			{
+				 0x1f, 0x45, 0xf7, 0x1c, 0x26, 0x39, 0x8a, 0x32, 0x5c, 0xfe, 0xb4, 0xc3, 0x46, 0x51, 0x22, 0x88, 0xef, 0x3b, 0xad, 0xb2, 0x5f, 0x29, 0x23, 0xab, 0x26, 0xbd, 0x3a, 0x1f, 0xbf, 0x24, 0x12, 0x36,
+				 0x3f, 0x73, 0xfe, 0x26, 0xfc, 0x3b, 0xd0, 0xca, 0xf1, 0xdd, 0x9d, 0x80, 0x68, 0xb9, 0x66, 0x1d, 0xc4, 0xf9, 0x6f, 0x07, 0x9e, 0xe9, 0xf2, 0x4d, 0x4e, 0xff, 0xc1, 0xd1, 0xe1, 0xf1, 0xbc, 0x6f,
+				 0x72
+			},
+			-1
+		},
+		{
+			"not valid #3",
+			{
+				data: {
+					0x48, 0xd7, 0xd3, 0x83,0x9c, 0xa2, 0x82, 0xde,
+					0xb6, 0x9a, 0xb8, 0x34,0x36, 0xb0, 0x9f, 0x19,
+					0xbb, 0xdf, 0x2b, 0xb5,0x39, 0x42, 0x92, 0x32,
+					0x33, 0x34, 0x84, 0xdd,0xba, 0xbd, 0x95, 0x43
+				},
+			},
+			// EOS5vhJWLeBjQAiTZxWdnFkttUDWANurEka69La2nu8fp2gSi5eQk
+			{ 0x02, 0x88, 0xb4, 0x83, 0x3a, 0x86, 0x18, 0xd3, 0xb2, 0x2b, 0xbe, 0xe6, 0x59, 0x3d, 0xf2, 0x41, 0xf6, 0xed, 0x86, 0x40, 0xe6, 0x19, 0xc8, 0x45, 0x03, 0x78, 0x57, 0xde, 0xcb, 0x2a, 0xd7, 0xc2, 0xf0 },
+			// SIG_K1_K2XJBWCnx98kr8N3fe25BFDpsc8M4nERkzYSWpVAMoXBv9Nw83xDTTSErstUnh25scMGDHn9TsAqNirNruWRM3jzdKGe7m
+			{
+				0x1f, 0x37, 0x8c, 0xf2, 0xbe, 0xb1, 0x18, 0xb7, 0x80, 0x60, 0xd5, 0x60, 0x9f, 0xee, 0x7b, 0x36, 0xcc, 0x42, 0x9c, 0x12, 0xb8, 0xd1, 0x5f, 0x62, 0xad, 0x88, 0x4f, 0x6c, 0x65, 0xa1, 0x70, 0x03,
+				0x30, 0x1b, 0x65, 0x80, 0xc9, 0xe9, 0xba, 0xfe, 0xcf, 0xcc, 0xdb, 0x2d, 0xf0, 0x37, 0x1b, 0x00, 0x39, 0xb5, 0x16, 0x7c, 0xde, 0xec, 0x4b, 0xec, 0xc1, 0xf4, 0xf2, 0x6f, 0x1b, 0xfa, 0x80, 0x9d,
+				0x81
+			},
+			-1
+		},
+	};
+
+	libeosio::ec_init();
+
+	for(auto it = tests.begin(); it != tests.end(); it++) {
+		SUBCASE(it->name) {
+			CHECK( libeosio::ecdsa_verify(&it->dgst, it->sig, it->pubkey) == it->expected );
+		}
+	}
+
+	libeosio::ec_shutdown();
+}
+