From 3caf31d20c668cf54a1621e21b7f1d943f0db048 Mon Sep 17 00:00:00 2001
From: Adam Gibson <ekaggata@gmail.com>
Date: Tue, 29 Mar 2016 14:43:24 +0300
Subject: [PATCH] allow use of custom nonce in ecdsa_sign add test of custom
 nonce

---
 secp256k1/__init__.py                  |    9 +-
 tests/data/ecdsa_custom_nonce_sig.json | 1198 ++++++++++++++++++++++++
 tests/test_custom_nonce.py             |   62 ++
 3 files changed, 1266 insertions(+), 3 deletions(-)
 create mode 100644 tests/data/ecdsa_custom_nonce_sig.json
 create mode 100644 tests/test_custom_nonce.py

diff --git a/secp256k1/__init__.py b/secp256k1/__init__.py
index 61b1b86..25d32a3 100644
--- a/secp256k1/__init__.py
+++ b/secp256k1/__init__.py
@@ -380,12 +380,15 @@ def tweak_mul(self, scalar):
         """
         return _tweak_private(self, lib.secp256k1_ec_privkey_tweak_mul, scalar)
 
-    def ecdsa_sign(self, msg, raw=False, digest=hashlib.sha256):
+    def ecdsa_sign(self, msg, raw=False, digest=hashlib.sha256, custom_nonce=None):
         msg32 = _hash32(msg, raw, digest)
         raw_sig = ffi.new('secp256k1_ecdsa_signature *')
-
+        nonce_fn = ffi.NULL
+        nonce_data = ffi.NULL
+        if custom_nonce:
+            nonce_fn, nonce_data = custom_nonce
         signed = lib.secp256k1_ecdsa_sign(
-            self.ctx, raw_sig, msg32, self.private_key, ffi.NULL, ffi.NULL)
+            self.ctx, raw_sig, msg32, self.private_key, nonce_fn, nonce_data)
         assert signed == 1
 
         return raw_sig
diff --git a/tests/data/ecdsa_custom_nonce_sig.json b/tests/data/ecdsa_custom_nonce_sig.json
new file mode 100644
index 0000000..e9d61e2
--- /dev/null
+++ b/tests/data/ecdsa_custom_nonce_sig.json
@@ -0,0 +1,1198 @@
+{
+    "vectors": [
+        {
+            "msg": "9e5755ec2f328cc8635a55415d0e9a09c2b6f2c9b0343c945fbbfe08247a4cbe", 
+            "nonce": "4b8624c92fb0f8a4c61a16585619a2e08e1937a2c7752514b45371e494377b8b", 
+            "sig": "3045022100fa5fe1c1cbfc5509a923a96f495476d16a387316db5c1d56c798a2af420d5b1402200397c24cb90dfeed573a9dbd8ca69b7a63a612886328ad12b20f3a1cd9955025", 
+            "privkey": "31a84594060e103f5a63eb742bd46cf5f5900d8406e2726dedfc61c7cf43ebad"
+        }, 
+        {
+            "msg": "2d46a712699bae19a634563d74d04cc2da497b841456da270dccb75ac2f7c4e7", 
+            "nonce": "0c814566ee56a9fa7405536ac3352fe42341d17b83075f0e3b76222fae5e244f", 
+            "sig": "3045022100e47190961a4a2846c0df599fa9076db3fae0bfb91efa22bd19cbe41b668d335802204ac8321752e1c6c6151f0b6399d4fd4b4acf87a1f7783bb813fe2d132bd2c677", 
+            "privkey": "7177f0d04c79fa0b8c91fe90c1cf1d44772d1fba6e5eb9b281a22cd3aafb51fe"
+        }, 
+        {
+            "msg": "c94f4ec84be928017cbbb447d2ab5b5d4d69e5e5fd03da7eae4378a1b1c9c402", 
+            "nonce": "f5efa357bc8497ef4ec4a42e37695f2c7bb60349282312aa4bc145957ef40553", 
+            "sig": "304402200853f156146dd9bb607c575906fa1788cc1840f6bf15bd477437a84e86607aa7022046b38629111c2ecc65f7696685757c3f589047f396d0d104740830300bd2f0b6", 
+            "privkey": "989e500d6b1397f2c5dcdf43c58ac2f14df753eb6089654e07ff946b3f84f3d5"
+        }, 
+        {
+            "msg": "dfeb2092955572ce0695aa038f58df5499949e18f58785553c3e83343cd5eb93", 
+            "nonce": "827675597f1fdd1e710f1339cef8ebae90d517bbb90cfd3883d9e94619d73e35", 
+            "sig": "3045022100dfc1cbd47a9129c933e25e4bb1bdde8021fddb65b3dacb76fbaa42dbfa39629402201d4fb89609c1782342f3b554c7f261b4b5ba295c9f7c74c187e9e02f9e080e53", 
+            "privkey": "39dfc615f2b718397f6903b0c46c47c5687e97d3d2a5e1f2b200f459f7b1219b"
+        }, 
+        {
+            "msg": "49e558d232ca204ecc27b321b197bfe0e165acd5fe46f986d5b007c68c2dcbd7", 
+            "nonce": "6b7ccf72f66312b1f2ba6357de649828a8de9aa3fa7dc6b70bfe94f6f11298f5", 
+            "sig": "3045022100957ec8c4bdd8d46711005fb0e44789a95479f76040877ed8aa2677b78c35699a022018d422ed57226ee2a2f8634c9a3a92d02ae3dced6d6992331bf4cf2cae5c1c3f", 
+            "privkey": "1e17c938ef3754781130edcbe8fa2c8a27ecb43f93d333e64d89af3d9c26c23a"
+        }, 
+        {
+            "msg": "12a683325e3063e4d9d32d38f878300d84d4ebb63247607dfb2bd72849e5fb14", 
+            "nonce": "1a84d3eea5dc243be02beb19bb0c642273755100160aa4e11063e3a1dd111985", 
+            "sig": "3045022100c70a0ba8c091c0bef41bb1baa4b83834bc206a45e3cba35e3caaa3f7934f458502207fbf77355dbf0643ea63a962f5d6c3fce6b2a57c29023b7b5b99b55f2959c7ce", 
+            "privkey": "9120318c2d0792a29516b18a3467051445e5a6c358da577dcf06ea5ddfb8839f"
+        }, 
+        {
+            "msg": "06e42f8adc7c2ac118b6e6d1082940c66f7d2544fa2eaae0d2b1d016fea26092", 
+            "nonce": "5429b548ab6907e0d60de20554a70ea7c2f63d06e9a65a1eb58c27dbce3b4c5b", 
+            "sig": "304402203094e4cbd0435756644225fe95710c8c3e3ada60c3a52bef639187831d96846d022066790ff0334fa7acfa95a7f5b7b6c5a4431f57a7e5f0c3c20154dd6d702b9766", 
+            "privkey": "a7433f154076cd9317e048562fe60529140a1155a1497ebd165b081c053e8944"
+        }, 
+        {
+            "msg": "43307439480b2d4c3a95e725d1a13a97ec032cdbdda467533dce304513752d46", 
+            "nonce": "7423e1566ee4b3172fc1dd9fa4c72df9052f54b99b89ded9d1c738c7fef40c73", 
+            "sig": "304402207d730e807c45015c20fa3f1505ec91eeb116c2f5fac90ab6cea47163b760740a022011854bc2abf629e08b51a272c13ba9229e3daac2731c12c7f63dadace42a1955", 
+            "privkey": "58a127499af1fa4f6cc95d6b2213171762a3be0d929246f27044d64de24c4db2"
+        }, 
+        {
+            "msg": "3a75a427f8311ae278b76bcce9a2ba99b9adc1ee91d653f9f00052b9e154b511", 
+            "nonce": "849f308f7a134388a94f0a48f66e1b8b358abe02bf48fde79e7dc571a5231377", 
+            "sig": "3044022069c087144c2d6cf94490b466684012649ac73220caee5ee279a351216b1df84402203da1392d833885a37eede826260e2bbeeee4cbb130c42b994e86c4fd61acfe5b", 
+            "privkey": "17449f296f72790a85284a3eead10e775b452a32e7cdf1f0e68f109e5732d8a4"
+        }, 
+        {
+            "msg": "d2ae97ae7b0b488f3a9cca6b7ed92832b4a6a7a3546a3ed9964eb51fbb2fcd98", 
+            "nonce": "8882eb230d2e571b2619f2c3e89f7b9aa7c9a22f1f12e341543221c4394c3e40", 
+            "sig": "304402206c790324ea5f86c50413f1cf42bc79c24c1a78301b196b39e43aaeb9762c08e30220044fd87a19df6740b3523d38b5af5f789f69e4fc364998044e90debd36f748c1", 
+            "privkey": "229d075d7a48c5725f21e585e9effb08c80ea768883fc372ed3ad48af60a653d"
+        }, 
+        {
+            "msg": "3492a279ef2ddfebc47cc7ee28be41b5ffc03c54b738f657862590237e56841b", 
+            "nonce": "f88d02cf00adf5a915cb97f37b9d8e5d0cb36fbed35d213da7b83f273f74aa05", 
+            "sig": "30440220538303df32a06706ec8c249a79fc73054feb48db959387a5255c925934a4135102203fadec1d26c4578408fc8d1e91ab3924576784ab05fa709e69e059792afcbd47", 
+            "privkey": "f2f83ccb7ecd11e6ef61a8a090890b6db56e87810be8f283626f6028843e70c2"
+        }, 
+        {
+            "msg": "bab37255a348dcfd8864aa2bd1b964c951da28370743905f892bbf5533b2c881", 
+            "nonce": "866d874372a92fb4676319ec55571aefac4a28a7995c7b7559585d17ba3f7823", 
+            "sig": "3045022100ef77b7ba96ec9479691e9a57fbd119b82dfd3c4bcdc99791402338eccb066d39022013e706415a7df86f848829af749dc7ec5c9f53bbbfc849a97de65a8730790851", 
+            "privkey": "c476e1df4d6bc771b23836b58616ed5bb6417baaab3c533dd255562d41cce2df"
+        }, 
+        {
+            "msg": "3543080c755844091a26bc812fefa40d00663f57622bdb63334ffbdd70ac8cfd", 
+            "nonce": "dec12f323446e71fe8fbd53793178e4f811cfd318054c8473373b82d68fe9ddd", 
+            "sig": "3044022068b81c75f747d1af439449b657a280c396de15f336b07b61ee020e17f8346999022024ea237a2c7e6d3932c902202bfead7a861d72f5f6f59ff1009ff336ccb0d102", 
+            "privkey": "e9fd9db20943a760c4cf89a9eb8aa150405686332c8a2ab8789ef19593312ac9"
+        }, 
+        {
+            "msg": "aa05ef24738774890500e5d4f25f2801802a4c20f1be4f06721220d065abe042", 
+            "nonce": "7b906bda129dedfae20aff5ead13860f8ef4f83a2d3b4efb481856fce27f4af0", 
+            "sig": "30440220280d38aaa7765dc8e33e7ad030319389e80301c9801d3dd0ccfd8645ce878f8b022007e14e5d074f1827af36fe3694567354d4a8aeebf28396615449b280724d3fb5", 
+            "privkey": "251e11bc1fdf9ce349c904af6f3df523e906e0367e18c96e111104715fbbfcbc"
+        }, 
+        {
+            "msg": "57176b5966096a1818148936e1c56bea9717a7b9f4e3decf582b4ae3585e794d", 
+            "nonce": "d4649d7949e22041d1b52a60c994d08a3f2ff86244b3979c0afadb183b8bf16b", 
+            "sig": "304402205df32c2fd29cf6abca1c4780304f07f161a8ec8032e04c98fade429ad6d1364f0220697e0d4954a3a0c7391fd9cff778f46c10296cd94d9baf9ee26464cd8f6bc34a", 
+            "privkey": "099796458bffc713b89b1332089b093f8ed08039fa1d8323d7a8b198225d89d5"
+        }, 
+        {
+            "msg": "8b339212a72cbea99b8e882e4ce7c32a1a1f0e5185d3c8e4b99c9a8ebfe58060", 
+            "nonce": "6afdd234f84e6a22541e0ddc9c5ae80c2431021b5b3f8035a3343be543191655", 
+            "sig": "3044022008db125aa37ff9ca35da483eef1aeef1c4e95b9e4c477dae73ae8e4f8ca4056202201890e08ae739c36d4b53f29f788b74d6d401367939ba73c130e760247ea1fdae", 
+            "privkey": "00417c436e3f135eb2292eb5d88cab40157b0989dc0d917ab6e87e8faa0f1ee5"
+        }, 
+        {
+            "msg": "f1415142ca90a4f6d1f5c63dd0d776642e34bc3fe3a9ea1427afdf9d71d79231", 
+            "nonce": "d7cde7766a6fd0ce3ae4bbd090ad1112fe25e08a17dac09bb2fd49afe23ba773", 
+            "sig": "3044022021524114dd7d17021295bad5762c2f8b72e72e7e84894f90db56305c06ba791202201d8007df4812d452194b5867db0a88ffbd29f321999c79610586009645e32314", 
+            "privkey": "1d77dcd3d3631285c0a99a6c669d804fb603cc8a788c4568a46971b46718453a"
+        }, 
+        {
+            "msg": "e5a093e9d225f09961f35f44b3171962b2ad3f9c859c3c21d0f03fc7dfadbd51", 
+            "nonce": "ffa064507e9f65c2154203a51f7a82727d8cfb2cfeed55def8fbd3821c334288", 
+            "sig": "3045022100a3f1ccb2f2a3048cd422e87a924a868b7505b47c9de005442b1b1370ff3ba0e7022035e502ef602630e6d50edd1cbe0c132b0294efaeba2c7c7e62d618c1f56daa30", 
+            "privkey": "df693dfdca61122d2e633d2a2d8f4270a9199624d06f9230325d82708da5e9d2"
+        }, 
+        {
+            "msg": "42f5f89f123967d7ecb0f0ffbac97d1e414d22f8aeea5f61ab18c67d9b05b062", 
+            "nonce": "b771558537629df225f66248743bf33f7a357a00016325c07b957c898d39e5ea", 
+            "sig": "3045022100a328c04134d967e7b52a38d36add74c5cd1dd8584e5e4e604a81c42692466d4d022021890f664fc6e131410fed47f448106a08e2f3f807d1bfd3ece9554d323e2507", 
+            "privkey": "3e21112d32f27677d715c4f12d4005d551a5a523d7c63717f2166ebea89addc5"
+        }, 
+        {
+            "msg": "f1914da938a0c2e8112c769591ee070ac4123b9c487c0ed7fab6b04473bf7714", 
+            "nonce": "41eecfe93195e9dbb1b3aea9a52708889a16351011a284d59d568d3fa7dc9c4c", 
+            "sig": "304402203f0f5f37a8ecd3510ef682da6129fad9ae98dd08ea04b2e3d8815d6a46e919dc0220215e62e67ababc020e39f0d16f66d4eafa5d77220e9ff3dd451a7656ea157d40", 
+            "privkey": "ec3eaa66a6ef4b6c31acd75528218e702419bdf1c086431137926fe71daaaea0"
+        }, 
+        {
+            "msg": "3cf9fb4cf59c6d37da6c36e0d680b1d364800e94b54f2b9074d755a456a0d7f4", 
+            "nonce": "2499943798bb2f5cd1c618b94500ae35c4f866cafca2c5fb18f3b051b558b6d9", 
+            "sig": "3045022100af7c0a79d07356f46c7e46eb218326888d993f831578262b18636f31868f0d2c0220719f9e4687734aa7287d9a7ee81405443291fd90f1932ba8b807d03cd3f466bd", 
+            "privkey": "a51997dff0ae72ff3005ae6cad243a5d5c6864691d238fd58123bea364008009"
+        }, 
+        {
+            "msg": "ada128dfd83338a8b0f5ead162a0fc7acaa513d5c13b9b1d5d921d2648e674f5", 
+            "nonce": "8c6e2bbb21dae8f55a572f4e310d19f4d2187058a85227a6e55e59c0daf9e773", 
+            "sig": "3044022076a7ad1a102bdda7a9b85990a72d1f084a62a918fc269be0a67bdaf98e1079ab02203ac489dd84123d61b7b3d1575ac0941b98fe9a1f6aad093fd531816c85e70b17", 
+            "privkey": "9a8114c3bfe3656290a0d092bb80a9f5c67b3e938ba719424c5c8c83e13ce266"
+        }, 
+        {
+            "msg": "d23cdc4accc2566b82fe6270e144f366f08007dffcf9e47c1c66d40708747da0", 
+            "nonce": "a790f57549a4752dd6482002292164f241310a2a8862090a43ef38e1612fc6a1", 
+            "sig": "3045022100db6c649f4553886945e712592d34e6fcc63f01f59bf22d7540c8e2afb9a9e4b70220013c641b6fbc79af89c9c3bcda66925c4ded9404535972d25886b9fd33b95f50", 
+            "privkey": "f1d7fb29ab98d00f46135b74de1b7ea80f3e38360c9ee0cd7056404c5d1db57b"
+        }, 
+        {
+            "msg": "e89e786443b5634afbe711f66530326320a0e5ec27d1c42697e5fbc11e5ce169", 
+            "nonce": "9aeaa8bad1075c0046b92131cbd702b9eadbdfea14f2a2e3477f3aa88bac7fd2", 
+            "sig": "304502210086641ef720852ff2193664741d883f64b7ce48cfebd2719f565973cc63104c6b0220729a34c05d6414b2b987819b4bfd8579e4dd8d49b7e1032a218caf7fca24c779", 
+            "privkey": "ab8f7d2eb73af6349990d2b4296d98432da8bbd858863bfa136e234a56351090"
+        }, 
+        {
+            "msg": "ba7de66731341e48fca15ef5b62c88f19b2aee7786987d73754be8e339f706aa", 
+            "nonce": "d20fea0ff60860762aad107564b0b76b0794761b0aa4bf6a1335c6a279b2fb17", 
+            "sig": "3045022100bd10feda2d9218ef99fc5be4b432953fc9bd6474121eb9f8226abee326d8447b02202812b3d9c4bad49ebdc21f50c6717f50b12d0d6cfdc4c55a778d3a828ac09fff", 
+            "privkey": "d142f008e4ee702e6ddbf6f5429e4b39e0cd59034018a332635e6fab028f2fbe"
+        }, 
+        {
+            "msg": "1ddaa971fd3b025d0566d9bf893a0043329379e2c52561ad3ebd3815bae0e818", 
+            "nonce": "873328130066148dd6afe3ebf8fea5422e9d56f4c2679b05da51dd3163f36bf4", 
+            "sig": "3044022058c073f0f9993a62323a261ee38748f3d616b4553ef81492b59b0eeb2414ad69022076da56c66cc5a4c3f13983faaa872ff46cf9885c2d273f04f4fa805f739988cc", 
+            "privkey": "c03a06e7e3958f790f3d1bbd8c9938e3c1636301a04b15b2774d27381a383d35"
+        }, 
+        {
+            "msg": "c5b4b2981c007f5e5b6aceb950985e64f8c5afec77955e973bc65f1a913ccd2d", 
+            "nonce": "2e0a0a02eab7ac4f5a9d09a60de2c9740c5354e992380abe56137dd22171e280", 
+            "sig": "30450221009c73e5de875c5b6c6aab5788170cdc23d5a80850fb4cbcbe770d6abbc38f6d2202204f20cde9d809200b2e18174bc136cbe1d5a6d879b6d85ab59cb0229b8050b4f2", 
+            "privkey": "795b50f2d308bf999565a084c8f709e6393f69a7842ce889c5addbd17c24ff5c"
+        }, 
+        {
+            "msg": "1544d33544fa93334739a60a35bab4390b523bdbaa43ba3956ca450ad03f6201", 
+            "nonce": "3eda7e0a132ed2dd8e3b6801bc11882786e4f69c1420cdd4b446995145ae7664", 
+            "sig": "3045022100f1edb077c0ae3fe2e2d73029c0ebecae1dc2b4951c77cbb54347bd560b76e251022026001c94858a400fb5f106bfe1a1109b93d88176ec59b802c9a4b2763c4ca08a", 
+            "privkey": "fd2190d00de40b004f9a5d6d06829fe87eb1b11e483e94023fa01b41c27da90b"
+        }, 
+        {
+            "msg": "cd40650b1d22d7a7777ac3a6d8701c12b485dd3859dacbaca56ad4ee4a3f6024", 
+            "nonce": "d300bd25522e1a58d3cd944cae164bcc8fe078b5e28c460cff6fce4f6e54034b", 
+            "sig": "304402205e20d8aacd47aa38090bad33415e6cb4d8c12cd5bf765ea418d5529b3aa974c50220335f3c57d459b2d93da6e80253234c749bf7d64c7faea666daef33245b7ae5b7", 
+            "privkey": "3a6857669abb2d6f2f529b548f6386435856ebc98d8760e75642ff30a149454a"
+        }, 
+        {
+            "msg": "5817d0ffe477cab901884793ce1e5d40302941ea7460a2b468b7b02f08203527", 
+            "nonce": "9716c9e291216fa3f94009e5becadeb199a9e611a526062b8048a3087163600d", 
+            "sig": "3045022100f8da049faee4ead585caf5e7c3f7b0ec4f1e23ba3fe36c954d0bb4399b4c454a022001415cab05f73cbf54001b39a1e8a0b39a7b4aadb0b05ed9ae5d8dd257edb4be", 
+            "privkey": "9054a4c8279b1812748c690f7de4a8305e7ba2afa27bb30a70ec2be6cfdcd104"
+        }, 
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+            "sig": "304402202be348b1aab1c4db645f548d9d93d2a8584ff060837480040bd3187bb65cc72e02204fb53b458795c24a4ea8650db1f1ce67fc6eea0e41f7a32d5f81b8a229f8199b", 
+            "privkey": "1f25a034e5df2a5ae72f91d63be72497c3a1df79300ce195ee73e4cfeeda37a6"
+        }, 
+        {
+            "msg": "0b34440573c1ea6ea03e4b5500307948698f229b5a1315f81a5c622fdf660ddf", 
+            "nonce": "13193c7f0ff2d76e21c1ed4ddfc976b81622867ea9d48a3631a64ce5548b68b1", 
+            "sig": "30450221008e6ea8df79c02344f03dc3cdac3b5eface818f9083bbea218b635a97b48a74840220136604eb9b2f49176c598d830565995d590ce0e98c06418651cbf896790da8b0", 
+            "privkey": "2dfc3b63b1c8f04643f550281371a846a1d31fa651fb861f7e6ae9db88122041"
+        }, 
+        {
+            "msg": "88dde95676e529d3bd4422e8a50d106a4bbd465e8623b37d09228ff66c9dd275", 
+            "nonce": "5b9847a64e67d71b29227d87041edf966ff2f34ed1a60c7c809e9bc6dcef4ae6", 
+            "sig": "3044022071cf0249ca2008aa23a635bd482144f8a76dec21231be8432717af8dc188154c02202469b4b2d8e73fc07b40bd5e55096ebf5d6ddceee87ebb3cc6221f0016d0ec99", 
+            "privkey": "d2f35b4f8e5f9db7e884ab4bcb64f84dc4d87a8d4b9055995df62b759e7ba4aa"
+        }, 
+        {
+            "msg": "3617b55b4aed94d2fddf0f96f9c8c9f4359f948a2b902b76f0d9474a9e549710", 
+            "nonce": "8818b2be79927ad07b139628880b389ddd86804f623b0d3285d0ce059ef5cb1d", 
+            "sig": "3044022066770c75ced72fdf2bccbebba4314c2b37a1e5db895425e7cbe6d883efc35d20022020209f0ef232a81645ed8ad7e89fab6e56de7599451633a619266791783966b7", 
+            "privkey": "66dc7feb6d7c733005c5d8716b22f38819738bd1538a40f46205f3f3be191efc"
+        }
+    ]
+}
\ No newline at end of file
diff --git a/tests/test_custom_nonce.py b/tests/test_custom_nonce.py
new file mode 100644
index 0000000..d71f03c
--- /dev/null
+++ b/tests/test_custom_nonce.py
@@ -0,0 +1,62 @@
+import os
+import json
+import pytest
+import secp256k1
+
+HERE = os.path.dirname(os.path.abspath(__file__))
+DATA = os.path.join(HERE, 'data')
+
+from cffi import FFI
+
+ffi = FFI()
+ffi.cdef('static int nonce_function_rand(unsigned char *nonce32,'
+         'const unsigned char *msg32,const unsigned char *key32,'
+         'const unsigned char *algo16,void *data,unsigned int attempt);')
+
+#The most elementary conceivable nonce function, acting
+#as a passthrough: user provides random data which must be
+#a valid scalar nonce. This is not ideal, 
+#since libsecp256k1 expects the nonce output from
+#this function to result in a valid sig (s!=0), and will
+#increment the counter ("attempt") and try again if it fails;
+#since we don't increment the counter here, that will not succeed.
+#Of course the likelihood of such an error is infinitesimal.
+#TLDR this is not intended to be used in real life; use
+#deterministic signatures.
+ffi.set_source("_noncefunc",
+"""
+static int nonce_function_rand(unsigned char *nonce32,
+const unsigned char *msg32,
+const unsigned char *key32,
+const unsigned char *algo16,
+void *data,
+unsigned int attempt)
+{
+memcpy(nonce32,data,32);
+return 1;
+}
+""")
+
+ffi.compile()
+
+import _noncefunc
+from _noncefunc import ffi
+
+def test_ecdsa_with_custom_nonce():
+    data = open(os.path.join(DATA, 'ecdsa_custom_nonce_sig.json')).read()
+    vec = json.loads(data)['vectors']
+    inst = secp256k1.PrivateKey()
+    for item in vec:
+        seckey = bytes(bytearray.fromhex(item['privkey']))
+        msg32 = bytes(bytearray.fromhex(item['msg']))
+        sig = bytes(bytearray.fromhex(item['sig']))        
+        randnonce = bytes(bytearray.fromhex(item['nonce']))
+        inst.set_raw_privkey(seckey)
+        nf = ffi.addressof(_noncefunc.lib, "nonce_function_rand")
+        ndata = ffi.new("char [32]", randnonce)
+        sig_raw = inst.ecdsa_sign(msg32, raw=True, custom_nonce=(nf, ndata))
+        sig_check = inst.ecdsa_serialize(sig_raw)
+        assert sig_check == sig
+        assert inst.ecdsa_serialize(inst.ecdsa_deserialize(sig_check)) == sig_check
+        assert inst.pubkey.ecdsa_verify(msg32, sig_raw, raw=True)
+