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-rw-r--r--src/crypto/chacha20.cpp132
-rw-r--r--src/crypto/chacha20.h18
-rw-r--r--src/random.cpp2
-rw-r--r--src/random.h2
-rw-r--r--src/test/crypto_tests.cpp47
5 files changed, 185 insertions, 16 deletions
diff --git a/src/crypto/chacha20.cpp b/src/crypto/chacha20.cpp
index ac4470f04f..42a17f02ff 100644
--- a/src/crypto/chacha20.cpp
+++ b/src/crypto/chacha20.cpp
@@ -71,7 +71,7 @@ void ChaCha20::Seek(uint64_t pos)
input[13] = pos >> 32;
}
-void ChaCha20::Output(unsigned char* c, size_t bytes)
+void ChaCha20::Keystream(unsigned char* c, size_t bytes)
{
uint32_t x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15;
uint32_t j0, j1, j2, j3, j4, j5, j6, j7, j8, j9, j10, j11, j12, j13, j14, j15;
@@ -178,3 +178,133 @@ void ChaCha20::Output(unsigned char* c, size_t bytes)
c += 64;
}
}
+
+void ChaCha20::Crypt(const unsigned char* m, unsigned char* c, size_t bytes)
+{
+ uint32_t x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15;
+ uint32_t j0, j1, j2, j3, j4, j5, j6, j7, j8, j9, j10, j11, j12, j13, j14, j15;
+ unsigned char *ctarget = nullptr;
+ unsigned char tmp[64];
+ unsigned int i;
+
+ if (!bytes) return;
+
+ j0 = input[0];
+ j1 = input[1];
+ j2 = input[2];
+ j3 = input[3];
+ j4 = input[4];
+ j5 = input[5];
+ j6 = input[6];
+ j7 = input[7];
+ j8 = input[8];
+ j9 = input[9];
+ j10 = input[10];
+ j11 = input[11];
+ j12 = input[12];
+ j13 = input[13];
+ j14 = input[14];
+ j15 = input[15];
+
+ for (;;) {
+ if (bytes < 64) {
+ // if m has fewer than 64 bytes available, copy m to tmp and
+ // read from tmp instead
+ for (i = 0;i < bytes;++i) tmp[i] = m[i];
+ m = tmp;
+ ctarget = c;
+ c = tmp;
+ }
+ x0 = j0;
+ x1 = j1;
+ x2 = j2;
+ x3 = j3;
+ x4 = j4;
+ x5 = j5;
+ x6 = j6;
+ x7 = j7;
+ x8 = j8;
+ x9 = j9;
+ x10 = j10;
+ x11 = j11;
+ x12 = j12;
+ x13 = j13;
+ x14 = j14;
+ x15 = j15;
+ for (i = 20;i > 0;i -= 2) {
+ QUARTERROUND( x0, x4, x8,x12)
+ QUARTERROUND( x1, x5, x9,x13)
+ QUARTERROUND( x2, x6,x10,x14)
+ QUARTERROUND( x3, x7,x11,x15)
+ QUARTERROUND( x0, x5,x10,x15)
+ QUARTERROUND( x1, x6,x11,x12)
+ QUARTERROUND( x2, x7, x8,x13)
+ QUARTERROUND( x3, x4, x9,x14)
+ }
+ x0 += j0;
+ x1 += j1;
+ x2 += j2;
+ x3 += j3;
+ x4 += j4;
+ x5 += j5;
+ x6 += j6;
+ x7 += j7;
+ x8 += j8;
+ x9 += j9;
+ x10 += j10;
+ x11 += j11;
+ x12 += j12;
+ x13 += j13;
+ x14 += j14;
+ x15 += j15;
+
+ x0 ^= ReadLE32(m + 0);
+ x1 ^= ReadLE32(m + 4);
+ x2 ^= ReadLE32(m + 8);
+ x3 ^= ReadLE32(m + 12);
+ x4 ^= ReadLE32(m + 16);
+ x5 ^= ReadLE32(m + 20);
+ x6 ^= ReadLE32(m + 24);
+ x7 ^= ReadLE32(m + 28);
+ x8 ^= ReadLE32(m + 32);
+ x9 ^= ReadLE32(m + 36);
+ x10 ^= ReadLE32(m + 40);
+ x11 ^= ReadLE32(m + 44);
+ x12 ^= ReadLE32(m + 48);
+ x13 ^= ReadLE32(m + 52);
+ x14 ^= ReadLE32(m + 56);
+ x15 ^= ReadLE32(m + 60);
+
+ ++j12;
+ if (!j12) ++j13;
+
+ WriteLE32(c + 0, x0);
+ WriteLE32(c + 4, x1);
+ WriteLE32(c + 8, x2);
+ WriteLE32(c + 12, x3);
+ WriteLE32(c + 16, x4);
+ WriteLE32(c + 20, x5);
+ WriteLE32(c + 24, x6);
+ WriteLE32(c + 28, x7);
+ WriteLE32(c + 32, x8);
+ WriteLE32(c + 36, x9);
+ WriteLE32(c + 40, x10);
+ WriteLE32(c + 44, x11);
+ WriteLE32(c + 48, x12);
+ WriteLE32(c + 52, x13);
+ WriteLE32(c + 56, x14);
+ WriteLE32(c + 60, x15);
+
+ if (bytes <= 64) {
+ if (bytes < 64) {
+ for (i = 0;i < bytes;++i) ctarget[i] = c[i];
+ }
+ input[12] = j12;
+ input[13] = j13;
+ return;
+ }
+ bytes -= 64;
+ c += 64;
+ m += 64;
+ }
+}
diff --git a/src/crypto/chacha20.h b/src/crypto/chacha20.h
index a305977bcd..5a4674f4a8 100644
--- a/src/crypto/chacha20.h
+++ b/src/crypto/chacha20.h
@@ -8,7 +8,8 @@
#include <stdint.h>
#include <stdlib.h>
-/** A PRNG class for ChaCha20. */
+/** A class for ChaCha20 256-bit stream cipher developed by Daniel J. Bernstein
+ https://cr.yp.to/chacha/chacha-20080128.pdf */
class ChaCha20
{
private:
@@ -17,10 +18,17 @@ private:
public:
ChaCha20();
ChaCha20(const unsigned char* key, size_t keylen);
- void SetKey(const unsigned char* key, size_t keylen);
- void SetIV(uint64_t iv);
- void Seek(uint64_t pos);
- void Output(unsigned char* output, size_t bytes);
+ void SetKey(const unsigned char* key, size_t keylen); //!< set key with flexible keylength; 256bit recommended */
+ void SetIV(uint64_t iv); // set the 64bit nonce
+ void Seek(uint64_t pos); // set the 64bit block counter
+
+ /** outputs the keystream of size <bytes> into <c> */
+ void Keystream(unsigned char* c, size_t bytes);
+
+ /** enciphers the message <input> of length <bytes> and write the enciphered representation into <output>
+ * Used for encryption and decryption (XOR)
+ */
+ void Crypt(const unsigned char* input, unsigned char* output, size_t bytes);
};
#endif // BITCOIN_CRYPTO_CHACHA20_H
diff --git a/src/random.cpp b/src/random.cpp
index 1aa78a9034..b08de60fbe 100644
--- a/src/random.cpp
+++ b/src/random.cpp
@@ -652,7 +652,7 @@ std::vector<unsigned char> FastRandomContext::randbytes(size_t len)
if (requires_seed) RandomSeed();
std::vector<unsigned char> ret(len);
if (len > 0) {
- rng.Output(&ret[0], len);
+ rng.Keystream(&ret[0], len);
}
return ret;
}
diff --git a/src/random.h b/src/random.h
index 1c035f87ba..2f9c0f5a36 100644
--- a/src/random.h
+++ b/src/random.h
@@ -111,7 +111,7 @@ private:
if (requires_seed) {
RandomSeed();
}
- rng.Output(bytebuf, sizeof(bytebuf));
+ rng.Keystream(bytebuf, sizeof(bytebuf));
bytebuf_size = sizeof(bytebuf);
}
diff --git a/src/test/crypto_tests.cpp b/src/test/crypto_tests.cpp
index 86cb00a78f..2d6e532203 100644
--- a/src/test/crypto_tests.cpp
+++ b/src/test/crypto_tests.cpp
@@ -187,17 +187,36 @@ static void TestAES256CBC(const std::string &hexkey, const std::string &hexiv, b
}
}
-static void TestChaCha20(const std::string &hexkey, uint64_t nonce, uint64_t seek, const std::string& hexout)
+static void TestChaCha20(const std::string &hex_message, const std::string &hexkey, uint64_t nonce, uint64_t seek, const std::string& hexout)
{
std::vector<unsigned char> key = ParseHex(hexkey);
+ std::vector<unsigned char> m = ParseHex(hex_message);
ChaCha20 rng(key.data(), key.size());
rng.SetIV(nonce);
rng.Seek(seek);
std::vector<unsigned char> out = ParseHex(hexout);
std::vector<unsigned char> outres;
outres.resize(out.size());
- rng.Output(outres.data(), outres.size());
+ assert(hex_message.empty() || m.size() == out.size());
+
+ // perform the ChaCha20 round(s), if message is provided it will output the encrypted ciphertext otherwise the keystream
+ if (!hex_message.empty()) {
+ rng.Crypt(m.data(), outres.data(), outres.size());
+ } else {
+ rng.Keystream(outres.data(), outres.size());
+ }
BOOST_CHECK(out == outres);
+ if (!hex_message.empty()) {
+ // Manually XOR with the keystream and compare the output
+ rng.SetIV(nonce);
+ rng.Seek(seek);
+ std::vector<unsigned char> only_keystream(outres.size());
+ rng.Keystream(only_keystream.data(), only_keystream.size());
+ for (size_t i = 0; i != m.size(); i++) {
+ outres[i] = m[i] ^ only_keystream[i];
+ }
+ BOOST_CHECK(out == outres);
+ }
}
static std::string LongTestString() {
@@ -497,25 +516,37 @@ BOOST_AUTO_TEST_CASE(aes_cbc_testvectors) {
BOOST_AUTO_TEST_CASE(chacha20_testvector)
{
// Test vector from RFC 7539
- TestChaCha20("000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f", 0x4a000000UL, 1,
+
+ // test encryption
+ TestChaCha20("4c616469657320616e642047656e746c656d656e206f662074686520636c617373206f66202739393a204966204920636f756"
+ "c64206f6666657220796f75206f6e6c79206f6e652074697020666f7220746865206675747572652c2073756e73637265656e"
+ "20776f756c642062652069742e",
+ "000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f", 0x4a000000UL, 1,
+ "6e2e359a2568f98041ba0728dd0d6981e97e7aec1d4360c20a27afccfd9fae0bf91b65c5524733ab8f593dabcd62b3571639d"
+ "624e65152ab8f530c359f0861d807ca0dbf500d6a6156a38e088a22b65e52bc514d16ccf806818ce91ab77937365af90bbf74"
+ "a35be6b40b8eedf2785e42874d"
+ );
+
+ // test keystream output
+ TestChaCha20("", "000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f", 0x4a000000UL, 1,
"224f51f3401bd9e12fde276fb8631ded8c131f823d2c06e27e4fcaec9ef3cf788a3b0aa372600a92b57974cded2b9334794cb"
"a40c63e34cdea212c4cf07d41b769a6749f3f630f4122cafe28ec4dc47e26d4346d70b98c73f3e9c53ac40c5945398b6eda1a"
"832c89c167eacd901d7e2bf363");
// Test vectors from https://tools.ietf.org/html/draft-agl-tls-chacha20poly1305-04#section-7
- TestChaCha20("0000000000000000000000000000000000000000000000000000000000000000", 0, 0,
+ TestChaCha20("", "0000000000000000000000000000000000000000000000000000000000000000", 0, 0,
"76b8e0ada0f13d90405d6ae55386bd28bdd219b8a08ded1aa836efcc8b770dc7da41597c5157488d7724e03fb8d84a376a43b"
"8f41518a11cc387b669b2ee6586");
- TestChaCha20("0000000000000000000000000000000000000000000000000000000000000001", 0, 0,
+ TestChaCha20("", "0000000000000000000000000000000000000000000000000000000000000001", 0, 0,
"4540f05a9f1fb296d7736e7b208e3c96eb4fe1834688d2604f450952ed432d41bbe2a0b6ea7566d2a5d1e7e20d42af2c53d79"
"2b1c43fea817e9ad275ae546963");
- TestChaCha20("0000000000000000000000000000000000000000000000000000000000000000", 0x0100000000000000ULL, 0,
+ TestChaCha20("", "0000000000000000000000000000000000000000000000000000000000000000", 0x0100000000000000ULL, 0,
"de9cba7bf3d69ef5e786dc63973f653a0b49e015adbff7134fcb7df137821031e85a050278a7084527214f73efc7fa5b52770"
"62eb7a0433e445f41e3");
- TestChaCha20("0000000000000000000000000000000000000000000000000000000000000000", 1, 0,
+ TestChaCha20("", "0000000000000000000000000000000000000000000000000000000000000000", 1, 0,
"ef3fdfd6c61578fbf5cf35bd3dd33b8009631634d21e42ac33960bd138e50d32111e4caf237ee53ca8ad6426194a88545ddc4"
"97a0b466e7d6bbdb0041b2f586b");
- TestChaCha20("000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f", 0x0706050403020100ULL, 0,
+ TestChaCha20("", "000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f", 0x0706050403020100ULL, 0,
"f798a189f195e66982105ffb640bb7757f579da31602fc93ec01ac56f85ac3c134a4547b733b46413042c9440049176905d3b"
"e59ea1c53f15916155c2be8241a38008b9a26bc35941e2444177c8ade6689de95264986d95889fb60e84629c9bd9a5acb1cc1"
"18be563eb9b3a4a472f82e09a7e778492b562ef7130e88dfe031c79db9d4f7c7a899151b9a475032b63fc385245fe054e3dd5"
generated by cgit v1.2.3 (git 2.26.2) at 2024-11-10 21:30:40 +0000