diff --git a/bip32.c b/bip32.c index 2f00a7564..d6af5cf98 100644 --- a/bip32.c +++ b/bip32.c @@ -13,9 +13,9 @@ void hdnode_from_pub(uint32_t version, uint32_t depth, uint32_t fingerprint, uin out->depth = depth; out->fingerprint = fingerprint; out->child_num = child_num; + memset(out->private_key, 0, 32); memcpy(out->chain_code, chain_code, 32); memcpy(out->public_key, public_key, 33); - memset(out->private_key, 0, 32); hdnode_fill_address(out); } @@ -32,9 +32,10 @@ void hdnode_from_seed(uint8_t *seed, int seed_len, HDNode *out) hdnode_fill_address(out); } -void hdnode_descent(HDNode *inout, uint32_t i) +int hdnode_private_ckd(HDNode *inout, uint32_t i) { uint8_t data[1 + 32 + 4]; + uint8_t I[32 + 32]; bignum256 a, b; if (i & 0x80000000) { // private derivation @@ -47,9 +48,9 @@ void hdnode_descent(HDNode *inout, uint32_t i) bn_read_be(inout->private_key, &a); - // this can be done because private_key[32] and chain_code[32] - // form a continuous 64 byte block in the memory - hmac_sha512(inout->chain_code, 32, data, sizeof(data), inout->private_key); + hmac_sha512(inout->chain_code, 32, data, sizeof(data), I); + memcpy(inout->private_key, I, 32); + memcpy(inout->chain_code, I + 32, 32); bn_read_be(inout->private_key, &b); bn_addmod(&a, &b, &order256k1); @@ -60,6 +61,41 @@ void hdnode_descent(HDNode *inout, uint32_t i) hdnode_fill_public_key(inout); hdnode_fill_address(inout); + return 1; +} + +int hdnode_public_ckd(HDNode *inout, uint32_t i) +{ + uint8_t data[1 + 32 + 4]; + uint8_t I[32 + 32]; + curve_point a, b; + bignum256 c; + + if (i & 0x80000000) { // private derivation + return 0; + } else { // public derivation + memcpy(data, inout->public_key, 33); + } + write_be(data + 33, i); + + memset(inout->private_key, 0, 32); + if (!ecdsa_read_pubkey(inout->public_key, &a)) { + return 0; + } + + hmac_sha512(inout->chain_code, 32, data, sizeof(data), I); + memcpy(inout->chain_code, I + 32, 32); + bn_read_be(I, &c); + scalar_multiply(&c, &b); // b = c * G + point_add(&a, &b); // b = a + b + inout->public_key[0] = 0x02 | (b.y.val[0] & 0x01); + bn_write_be(&b.x, inout->public_key + 1); + + inout->depth++; + inout->child_num = i; + + hdnode_fill_address(inout); + return 1; } void hdnode_fill_public_key(HDNode *xprv) diff --git a/bip32.h b/bip32.h index 3bb414d97..605b182f6 100644 --- a/bip32.h +++ b/bip32.h @@ -8,8 +8,8 @@ typedef struct { uint32_t depth; uint32_t fingerprint; uint32_t child_num; - uint8_t private_key[32]; // private_key + chain_code have to - uint8_t chain_code[32]; // form a continuous 64 byte block + uint8_t private_key[32]; + uint8_t chain_code[32]; uint8_t public_key[33]; char address[35]; } HDNode; @@ -20,9 +20,11 @@ void hdnode_from_pub(uint32_t version, uint32_t depth, uint32_t fingerprint, uin void hdnode_from_seed(uint8_t *seed, int seed_len, HDNode *out); -#define hdnode_descent_prime(X, I) hdnode_descent((X), ((I) | 0x80000000)) +#define hdnode_private_ckd_prime(X, I) hdnode_private_ckd((X), ((I) | 0x80000000)) -void hdnode_descent(HDNode *inout, uint32_t i); +int hdnode_private_ckd(HDNode *inout, uint32_t i); + +int hdnode_public_ckd(HDNode *inout, uint32_t i); void hdnode_fill_public_key(HDNode *xprv); diff --git a/ecdsa.c b/ecdsa.c index 5465b3eeb..cbe88ea8b 100644 --- a/ecdsa.c +++ b/ecdsa.c @@ -337,6 +337,33 @@ void ecdsa_get_address(const uint8_t *pub_key, uint8_t version, char *addr) } } +int ecdsa_read_pubkey(const uint8_t *pub_key, curve_point *pub) +{ + if (pub_key[0] == 0x04) { + bn_read_be(pub_key + 1, &(pub->x)); + bn_read_be(pub_key + 33, &(pub->y)); + return 1; + } + + if (pub_key[0] == 0x02 || pub_key[0] == 0x03) { // compute missing y coords + // y^2 = x^3 + 0*x + 7 + bn_read_be(pub_key + 1, &(pub->x)); + bn_read_be(pub_key + 1, &(pub->y)); // y is x + bn_multiply(&(pub->x), &(pub->y), &prime256k1); // y is x^2 + bn_multiply(&(pub->x), &(pub->y), &prime256k1); // y is x^3 + bn_addmodi(&(pub->y), 7, &prime256k1); // y is x^3 + 7 + bn_sqrt(&(pub->y), &prime256k1); // y = sqrt(y) + if ((pub_key[0] & 0x01) != (pub->y.val[0] & 1)) { + bn_substract(&prime256k1, &(pub->y), &(pub->y)); // y = -y + bn_mod(&(pub->y), &prime256k1); + } + return 1; + } + + // error + return 0; +} + // uses secp256k1 curve // pub_key - 65 bytes uncompressed key // signature - 64 bytes signature @@ -355,24 +382,9 @@ int ecdsa_verify(const uint8_t *pub_key, const uint8_t *sig, const uint8_t *msg, // if double hash is required uncomment the following line: // SHA256_Raw(hash, 32, hash); - if (pub_key[0] == 0x04) { - bn_read_be(pub_key + 1, &pub.x); - bn_read_be(pub_key + 33, &pub.y); - } else - if (pub_key[0] == 0x02 || pub_key[0] == 0x03) { // compute missing y coords - // y^2 = x^3 + 0*x + 7 - bn_read_be(pub_key + 1, &pub.x); - bn_read_be(pub_key + 1, &pub.y); // y is x - bn_multiply(&pub.x, &pub.y, &prime256k1); // y is x^2 - bn_multiply(&pub.x, &pub.y, &prime256k1); // y is x^3 - bn_addmodi(&pub.y, 7, &prime256k1); // y is x^3 + 7 - bn_sqrt(&pub.y, &prime256k1); // y = sqrt(y) - if ((pub_key[0] & 0x01) != (pub.y.val[0] & 1)) { - bn_substract(&prime256k1, &pub.y, &pub.y); // y = -y - bn_mod(&pub.y, &prime256k1); - } - } else - return 1; + if (!ecdsa_read_pubkey(pub_key, &pub)) { + return 1; + } bn_read_be(sig, &r); bn_read_be(sig + 32, &s); diff --git a/ecdsa.h b/ecdsa.h index cea9749ef..62b34cb43 100644 --- a/ecdsa.h +++ b/ecdsa.h @@ -32,10 +32,15 @@ #define USE_RFC6979 1 #endif +void point_add(const curve_point *cp1, curve_point *cp2); +void point_double(curve_point *cp); +void scalar_multiply(bignum256 *k, curve_point *res); + int ecdsa_sign(const uint8_t *priv_key, const uint8_t *msg, uint32_t msg_len, uint8_t *sig); void ecdsa_get_public_key33(const uint8_t *priv_key, uint8_t *pub_key); void ecdsa_get_public_key65(const uint8_t *priv_key, uint8_t *pub_key); void ecdsa_get_address(const uint8_t *pub_key, uint8_t version, char *addr); +int ecdsa_read_pubkey(const uint8_t *pub_key, curve_point *pub); int ecdsa_verify(const uint8_t *pub_key, const uint8_t *sig, const uint8_t *msg, uint32_t msg_len); #endif diff --git a/tests.c b/tests.c index 8f66cb9a3..832830116 100644 --- a/tests.c +++ b/tests.c @@ -89,35 +89,35 @@ START_TEST(test_bip32_vector_1) ck_assert_str_eq(node.address, "15mKKb2eos1hWa6tisdPwwDC1a5J1y9nma"); // [Chain m/0'] - hdnode_descent_prime(&node, 0); + hdnode_private_ckd_prime(&node, 0); ck_assert_mem_eq(node.chain_code, fromhex("47fdacbd0f1097043b78c63c20c34ef4ed9a111d980047ad16282c7ae6236141"), 32); ck_assert_mem_eq(node.private_key, fromhex("edb2e14f9ee77d26dd93b4ecede8d16ed408ce149b6cd80b0715a2d911a0afea"), 32); ck_assert_mem_eq(node.public_key, fromhex("035a784662a4a20a65bf6aab9ae98a6c068a81c52e4b032c0fb5400c706cfccc56"), 33); ck_assert_str_eq(node.address, "19Q2WoS5hSS6T8GjhK8KZLMgmWaq4neXrh"); // [Chain m/0'/1] - hdnode_descent(&node, 1); + hdnode_private_ckd(&node, 1); ck_assert_mem_eq(node.chain_code, fromhex("2a7857631386ba23dacac34180dd1983734e444fdbf774041578e9b6adb37c19"), 32); ck_assert_mem_eq(node.private_key, fromhex("3c6cb8d0f6a264c91ea8b5030fadaa8e538b020f0a387421a12de9319dc93368"), 32); ck_assert_mem_eq(node.public_key, fromhex("03501e454bf00751f24b1b489aa925215d66af2234e3891c3b21a52bedb3cd711c"), 33); ck_assert_str_eq(node.address, "1JQheacLPdM5ySCkrZkV66G2ApAXe1mqLj"); // [Chain m/0'/1/2'] - hdnode_descent_prime(&node, 2); + hdnode_private_ckd_prime(&node, 2); ck_assert_mem_eq(node.chain_code, fromhex("04466b9cc8e161e966409ca52986c584f07e9dc81f735db683c3ff6ec7b1503f"), 32); ck_assert_mem_eq(node.private_key, fromhex("cbce0d719ecf7431d88e6a89fa1483e02e35092af60c042b1df2ff59fa424dca"), 32); ck_assert_mem_eq(node.public_key, fromhex("0357bfe1e341d01c69fe5654309956cbea516822fba8a601743a012a7896ee8dc2"), 33); ck_assert_str_eq(node.address, "1NjxqbA9aZWnh17q1UW3rB4EPu79wDXj7x"); // [Chain m/0'/1/2'/2] - hdnode_descent(&node, 2); + hdnode_private_ckd(&node, 2); ck_assert_mem_eq(node.chain_code, fromhex("cfb71883f01676f587d023cc53a35bc7f88f724b1f8c2892ac1275ac822a3edd"), 32); ck_assert_mem_eq(node.private_key, fromhex("0f479245fb19a38a1954c5c7c0ebab2f9bdfd96a17563ef28a6a4b1a2a764ef4"), 32); ck_assert_mem_eq(node.public_key, fromhex("02e8445082a72f29b75ca48748a914df60622a609cacfce8ed0e35804560741d29"), 33); ck_assert_str_eq(node.address, "1LjmJcdPnDHhNTUgrWyhLGnRDKxQjoxAgt"); // [Chain m/0'/1/2'/2/1000000000] - hdnode_descent(&node, 1000000000); + hdnode_private_ckd(&node, 1000000000); ck_assert_mem_eq(node.chain_code, fromhex("c783e67b921d2beb8f6b389cc646d7263b4145701dadd2161548a8b078e65e9e"), 32); ck_assert_mem_eq(node.private_key, fromhex("471b76e389e528d6de6d816857e012c5455051cad6660850e58372a6c3e6e7c8"), 32); ck_assert_mem_eq(node.public_key, fromhex("022a471424da5e657499d1ff51cb43c47481a03b1e77f951fe64cec9f5a48f7011"), 33); @@ -129,6 +129,7 @@ END_TEST START_TEST(test_bip32_vector_2) { HDNode node; + int r; // init m hdnode_from_seed(fromhex("fffcf9f6f3f0edeae7e4e1dedbd8d5d2cfccc9c6c3c0bdbab7b4b1aeaba8a5a29f9c999693908d8a8784817e7b7875726f6c696663605d5a5754514e4b484542"), 64, &node); @@ -140,39 +141,56 @@ START_TEST(test_bip32_vector_2) ck_assert_str_eq(node.address, "1JEoxevbLLG8cVqeoGKQiAwoWbNYSUyYjg"); // [Chain m/0] - hdnode_descent(&node, 0); + r = hdnode_private_ckd(&node, 0); + ck_assert_int_eq(r, 1); ck_assert_mem_eq(node.chain_code, fromhex("f0909affaa7ee7abe5dd4e100598d4dc53cd709d5a5c2cac40e7412f232f7c9c"), 32); ck_assert_mem_eq(node.private_key, fromhex("abe74a98f6c7eabee0428f53798f0ab8aa1bd37873999041703c742f15ac7e1e"), 32); ck_assert_mem_eq(node.public_key, fromhex("02fc9e5af0ac8d9b3cecfe2a888e2117ba3d089d8585886c9c826b6b22a98d12ea"), 33); ck_assert_str_eq(node.address, "19EuDJdgfRkwCmRzbzVBHZWQG9QNWhftbZ"); // [Chain m/0/2147483647'] - hdnode_descent_prime(&node, 2147483647); + r = hdnode_private_ckd_prime(&node, 2147483647); + ck_assert_int_eq(r, 1); ck_assert_mem_eq(node.chain_code, fromhex("be17a268474a6bb9c61e1d720cf6215e2a88c5406c4aee7b38547f585c9a37d9"), 32); ck_assert_mem_eq(node.private_key, fromhex("877c779ad9687164e9c2f4f0f4ff0340814392330693ce95a58fe18fd52e6e93"), 32); ck_assert_mem_eq(node.public_key, fromhex("03c01e7425647bdefa82b12d9bad5e3e6865bee0502694b94ca58b666abc0a5c3b"), 33); ck_assert_str_eq(node.address, "1Lke9bXGhn5VPrBuXgN12uGUphrttUErmk"); // [Chain m/0/2147483647'/1] - hdnode_descent(&node, 1); + r = hdnode_private_ckd(&node, 1); + ck_assert_int_eq(r, 1); ck_assert_mem_eq(node.chain_code, fromhex("f366f48f1ea9f2d1d3fe958c95ca84ea18e4c4ddb9366c336c927eb246fb38cb"), 32); ck_assert_mem_eq(node.private_key, fromhex("704addf544a06e5ee4bea37098463c23613da32020d604506da8c0518e1da4b7"), 32); ck_assert_mem_eq(node.public_key, fromhex("03a7d1d856deb74c508e05031f9895dab54626251b3806e16b4bd12e781a7df5b9"), 33); ck_assert_str_eq(node.address, "1BxrAr2pHpeBheusmd6fHDP2tSLAUa3qsW"); // [Chain m/0/2147483647'/1/2147483646'] - hdnode_descent_prime(&node, 2147483646); + r = hdnode_private_ckd_prime(&node, 2147483646); + ck_assert_int_eq(r, 1); ck_assert_mem_eq(node.chain_code, fromhex("637807030d55d01f9a0cb3a7839515d796bd07706386a6eddf06cc29a65a0e29"), 32); ck_assert_mem_eq(node.private_key, fromhex("f1c7c871a54a804afe328b4c83a1c33b8e5ff48f5087273f04efa83b247d6a2d"), 32); ck_assert_mem_eq(node.public_key, fromhex("02d2b36900396c9282fa14628566582f206a5dd0bcc8d5e892611806cafb0301f0"), 33); ck_assert_str_eq(node.address, "15XVotxCAV7sRx1PSCkQNsGw3W9jT9A94R"); // [Chain m/0/2147483647'/1/2147483646'/2] - hdnode_descent(&node, 2); + r = hdnode_private_ckd(&node, 2); + ck_assert_int_eq(r, 1); ck_assert_mem_eq(node.chain_code, fromhex("9452b549be8cea3ecb7a84bec10dcfd94afe4d129ebfd3b3cb58eedf394ed271"), 32); ck_assert_mem_eq(node.private_key, fromhex("bb7d39bdb83ecf58f2fd82b6d918341cbef428661ef01ab97c28a4842125ac23"), 32); ck_assert_mem_eq(node.public_key, fromhex("024d902e1a2fc7a8755ab5b694c575fce742c48d9ff192e63df5193e4c7afe1f9c"), 33); ck_assert_str_eq(node.address, "14UKfRV9ZPUp6ZC9PLhqbRtxdihW9em3xt"); + + // init m + hdnode_from_seed(fromhex("fffcf9f6f3f0edeae7e4e1dedbd8d5d2cfccc9c6c3c0bdbab7b4b1aeaba8a5a29f9c999693908d8a8784817e7b7875726f6c696663605d5a5754514e4b484542"), 64, &node); + + // test public derivation + // [Chain m/0] + r = hdnode_public_ckd(&node, 0); + ck_assert_int_eq(r, 1); + ck_assert_mem_eq(node.chain_code, fromhex("f0909affaa7ee7abe5dd4e100598d4dc53cd709d5a5c2cac40e7412f232f7c9c"), 32); + ck_assert_mem_eq(node.private_key, fromhex("0000000000000000000000000000000000000000000000000000000000000000"), 32); + ck_assert_mem_eq(node.public_key, fromhex("02fc9e5af0ac8d9b3cecfe2a888e2117ba3d089d8585886c9c826b6b22a98d12ea"), 33); + ck_assert_str_eq(node.address, "19EuDJdgfRkwCmRzbzVBHZWQG9QNWhftbZ"); } END_TEST @@ -320,76 +338,76 @@ START_TEST(test_mnemonic) static const char *vectors[] = { "00000000000000000000000000000000", "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about", - "3d39670caaa237f5fb2999474413733b59d9dfe12b2cccfe878069a2f605ae467a669619a0a45c7b3378c4c812b80be677c1b8f8f60db9383f1ed265c45eb41c", + "c55257c360c07c72029aebc1b53c05ed0362ada38ead3e3e9efa3708e53495531f09a6987599d18264c1e1c92f2cf141630c7a3c4ab7c81b2f001698e7463b04", "7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f", "legal winner thank year wave sausage worth useful legal winner thank yellow", - "34eb04e0d4d60d00217f1c0150d8b0d6ffc6086e365a8a94fcceae8614e38274e719ebe7a693356426d1c62fdf90c84eaaac3d920743f3e79e0970a295886a08", + "2e8905819b8723fe2c1d161860e5ee1830318dbf49a83bd451cfb8440c28bd6fa457fe1296106559a3c80937a1c1069be3a3a5bd381ee6260e8d9739fce1f607", "80808080808080808080808080808080", "letter advice cage absurd amount doctor acoustic avoid letter advice cage above", - "acd45eb0b06e53d2e0fa6d1b3e8b3c33f200d2be6013fc5f8796c8c1d238552a615a01f325d78a10e633991d92f1236e21c24afe7c679fa1ecbc67fe71a5337d", + "d71de856f81a8acc65e6fc851a38d4d7ec216fd0796d0a6827a3ad6ed5511a30fa280f12eb2e47ed2ac03b5c462a0358d18d69fe4f985ec81778c1b370b652a8", "ffffffffffffffffffffffffffffffff", "zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo wrong", - 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"dd53ab268c524bad304e3decf4298ba1413a785bc866c2118988d1634bddf5a1301718191b247761060bc6dce3c62f833b22c062e51e7508fc04201cd7f8515b", + "107d7c02a5aa6f38c58083ff74f04c607c2d2c0ecc55501dadd72d025b751bc27fe913ffb796f841c49b1d33b610cf0e91d3aa239027f5e99fe4ce9e5088cd65", "ffffffffffffffffffffffffffffffffffffffffffffffff", "zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo when", - "f0747118b52dcd33d383e5f3d6dddc94f66accd38b6d48f8a07fed9752fa8457dcb40bba5f40399814dcbd1a3f5cfaead1cf26c72268d1aa71561611421d4aaf", + "0cd6e5d827bb62eb8fc1e262254223817fd068a74b5b449cc2f667c3f1f985a76379b43348d952e2265b4cd129090758b3e3c2c49103b5051aac2eaeb890a528", "0000000000000000000000000000000000000000000000000000000000000000", "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon art", - "681088fbeaf5e4c29de23f55967a942bcb3400dc5b6e507477dfdcb493d921902352e015cd1235279c61ddf26b9536e6cf87fccb3cf2e142db44689f78ccad12", + "bda85446c68413707090a52022edd26a1c9462295029f2e60cd7c4f2bbd3097170af7a4d73245cafa9c3cca8d561a7c3de6f5d4a10be8ed2a5e608d68f92fcc8", "7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f", "legal winner thank year wave sausage worth useful legal winner thank year wave sausage worth useful legal winner thank year wave sausage worth title", - 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