Merge #15519: Add Poly1305 implementation

e9d5e975612e828ec44f9247b4c5c08f0268d360 Poly1305: tolerate the intentional unsigned wraparound in poly1305.cpp (Jonas Schnelli)
b34bf302f26c7cede47cc20b3bdfb613c51ab67e Add Poly1305 bench (Jonas Schnelli)
03be7f48fad10aa8da3291c28a185ed750193c7b Add Poly1305 implementation (Jonas Schnelli)

Pull request description:

  This adds a currently unused Poly1305 implementation including test vectors from RFC7539.

  Required for BIP151 (and related to #15512).

Tree-SHA512: f8c1ad2f686b980a7498ca50c517e2348ac7b1fe550565156f6c2b20faf764978e4fa6b5b1c3777a16e7a12e2eca3fb57a59be9c788b00d4358ee80f2959edb1

1 files changed, 82 insertions, 0 deletions

diff --git a/src/test/crypto_tests.cpp b/src/test/crypto_tests.cpp
index 86cb00a78f..352cff37d1 100644
--- a/src/test/crypto_tests.cpp
+++ b/src/test/crypto_tests.cpp
@@ -4,6 +4,7 @@
 
 #include <crypto/aes.h>
 #include <crypto/chacha20.h>
+#include <crypto/poly1305.h>
 #include <crypto/ripemd160.h>
 #include <crypto/sha1.h>
 #include <crypto/sha256.h>
@@ -200,6 +201,17 @@ static void TestChaCha20(const std::string &hexkey, uint64_t nonce, uint64_t see
     BOOST_CHECK(out == outres);
 }
 
+static void TestPoly1305(const std::string &hexmessage, const std::string &hexkey, const std::string& hextag)
+{
+    std::vector<unsigned char> key = ParseHex(hexkey);
+    std::vector<unsigned char> m = ParseHex(hexmessage);
+    std::vector<unsigned char> tag = ParseHex(hextag);
+    std::vector<unsigned char> tagres;
+    tagres.resize(POLY1305_TAGLEN);
+    poly1305_auth(tagres.data(), m.data(), m.size(), key.data());
+    BOOST_CHECK(tag == tagres);
+}
+
 static std::string LongTestString() {
     std::string ret;
     for (int i=0; i<200000; i++) {
@@ -524,6 +536,76 @@ BOOST_AUTO_TEST_CASE(chacha20_testvector)
                  "fab78c9");
 }
 
+BOOST_AUTO_TEST_CASE(poly1305_testvector)
+{
+    // RFC 7539, section 2.5.2.
+    TestPoly1305("43727970746f6772617068696320466f72756d2052657365617263682047726f7570",
+                 "85d6be7857556d337f4452fe42d506a80103808afb0db2fd4abff6af4149f51b",
+                 "a8061dc1305136c6c22b8baf0c0127a9");
+
+    // RFC 7539, section A.3.
+    TestPoly1305("00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
+                 "000000000000000000000000000",
+                 "0000000000000000000000000000000000000000000000000000000000000000",
+                 "00000000000000000000000000000000");
+
+    TestPoly1305("416e79207375626d697373696f6e20746f20746865204945544620696e74656e6465642062792074686520436f6e747269627"
+                 "5746f7220666f72207075626c69636174696f6e20617320616c6c206f722070617274206f6620616e204945544620496e7465"
+                 "726e65742d4472616674206f722052464320616e6420616e792073746174656d656e74206d6164652077697468696e2074686"
+                 "520636f6e74657874206f6620616e204945544620616374697669747920697320636f6e7369646572656420616e2022494554"
+                 "4620436f6e747269627574696f6e222e20537563682073746174656d656e747320696e636c756465206f72616c20737461746"
+                 "56d656e747320696e20494554462073657373696f6e732c2061732077656c6c206173207772697474656e20616e6420656c65"
+                 "6374726f6e696320636f6d6d756e69636174696f6e73206d61646520617420616e792074696d65206f7220706c6163652c207"
+                 "768696368206172652061646472657373656420746f",
+                 "0000000000000000000000000000000036e5f6b5c5e06070f0efca96227a863e",
+                 "36e5f6b5c5e06070f0efca96227a863e");
+
+    TestPoly1305("416e79207375626d697373696f6e20746f20746865204945544620696e74656e6465642062792074686520436f6e747269627"
+                 "5746f7220666f72207075626c69636174696f6e20617320616c6c206f722070617274206f6620616e204945544620496e7465"
+                 "726e65742d4472616674206f722052464320616e6420616e792073746174656d656e74206d6164652077697468696e2074686"
+                 "520636f6e74657874206f6620616e204945544620616374697669747920697320636f6e7369646572656420616e2022494554"
+                 "4620436f6e747269627574696f6e222e20537563682073746174656d656e747320696e636c756465206f72616c20737461746"
+                 "56d656e747320696e20494554462073657373696f6e732c2061732077656c6c206173207772697474656e20616e6420656c65"
+                 "6374726f6e696320636f6d6d756e69636174696f6e73206d61646520617420616e792074696d65206f7220706c6163652c207"
+                 "768696368206172652061646472657373656420746f",
+                 "36e5f6b5c5e06070f0efca96227a863e00000000000000000000000000000000",
+                 "f3477e7cd95417af89a6b8794c310cf0");
+
+    TestPoly1305("2754776173206272696c6c69672c20616e642074686520736c6974687920746f7665730a446964206779726520616e6420676"
+                 "96d626c6520696e2074686520776162653a0a416c6c206d696d737920776572652074686520626f726f676f7665732c0a416e"
+                 "6420746865206d6f6d65207261746873206f757467726162652e",
+                 "1c9240a5eb55d38af333888604f6b5f0473917c1402b80099dca5cbc207075c0",
+                 "4541669a7eaaee61e708dc7cbcc5eb62");
+
+    TestPoly1305("ffffffffffffffffffffffffffffffff",
+                 "0200000000000000000000000000000000000000000000000000000000000000",
+                 "03000000000000000000000000000000");
+
+    TestPoly1305("02000000000000000000000000000000",
+                 "02000000000000000000000000000000ffffffffffffffffffffffffffffffff",
+                 "03000000000000000000000000000000");
+
+    TestPoly1305("fffffffffffffffffffffffffffffffff0ffffffffffffffffffffffffffffff11000000000000000000000000000000",
+                 "0100000000000000000000000000000000000000000000000000000000000000",
+                 "05000000000000000000000000000000");
+
+    TestPoly1305("fffffffffffffffffffffffffffffffffbfefefefefefefefefefefefefefefe01010101010101010101010101010101",
+                 "0100000000000000000000000000000000000000000000000000000000000000",
+                 "00000000000000000000000000000000");
+
+    TestPoly1305("fdffffffffffffffffffffffffffffff",
+                 "0200000000000000000000000000000000000000000000000000000000000000",
+                 "faffffffffffffffffffffffffffffff");
+
+    TestPoly1305("e33594d7505e43b900000000000000003394d7505e4379cd01000000000000000000000000000000000000000000000001000000000000000000000000000000",
+                 "0100000000000000040000000000000000000000000000000000000000000000",
+                 "14000000000000005500000000000000");
+
+    TestPoly1305("e33594d7505e43b900000000000000003394d7505e4379cd010000000000000000000000000000000000000000000000",
+                 "0100000000000000040000000000000000000000000000000000000000000000",
+                 "13000000000000000000000000000000");
+}
+
 BOOST_AUTO_TEST_CASE(countbits_tests)
 {
     FastRandomContext ctx;