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diff --git a/src/secp256k1/src/testrand_impl.h b/src/secp256k1/src/testrand_impl.h
new file mode 100644
index 0000000000..677c4b9a0e
--- /dev/null
+++ b/src/secp256k1/src/testrand_impl.h
@@ -0,0 +1,60 @@
+/**********************************************************************
+ * Copyright (c) 2013, 2014 Pieter Wuille                             *
+ * Distributed under the MIT software license, see the accompanying   *
+ * file COPYING or http://www.opensource.org/licenses/mit-license.php.*
+ **********************************************************************/
+
+#ifndef _SECP256K1_TESTRAND_IMPL_H_
+#define _SECP256K1_TESTRAND_IMPL_H_
+
+#include <stdint.h>
+#include <string.h>
+
+#include "testrand.h"
+
+static uint32_t secp256k1_Rz = 11, secp256k1_Rw = 11;
+
+SECP256K1_INLINE static void secp256k1_rand_seed(uint64_t v) {
+    secp256k1_Rz = v >> 32;
+    secp256k1_Rw = v;
+
+    if (secp256k1_Rz == 0 || secp256k1_Rz == 0x9068ffffU) {
+        secp256k1_Rz = 111;
+    }
+    if (secp256k1_Rw == 0 || secp256k1_Rw == 0x464fffffU) {
+        secp256k1_Rw = 111;
+    }
+}
+
+SECP256K1_INLINE static uint32_t secp256k1_rand32(void) {
+    secp256k1_Rz = 36969 * (secp256k1_Rz & 0xFFFF) + (secp256k1_Rz >> 16);
+    secp256k1_Rw = 18000 * (secp256k1_Rw & 0xFFFF) + (secp256k1_Rw >> 16);
+    return (secp256k1_Rw << 16) + (secp256k1_Rw >> 16) + secp256k1_Rz;
+}
+
+static void secp256k1_rand256(unsigned char *b32) {
+    for (int i=0; i<8; i++) {
+        uint32_t r = secp256k1_rand32();
+        b32[i*4 + 0] = (r >>  0) & 0xFF;
+        b32[i*4 + 1] = (r >>  8) & 0xFF;
+        b32[i*4 + 2] = (r >> 16) & 0xFF;
+        b32[i*4 + 3] = (r >> 24) & 0xFF;
+    }
+}
+
+static void secp256k1_rand256_test(unsigned char *b32) {
+    int bits=0;
+    memset(b32, 0, 32);
+    while (bits < 256) {
+        uint32_t ent = secp256k1_rand32();
+        int now = 1 + ((ent % 64)*((ent >> 6) % 32)+16)/31;
+        uint32_t val = 1 & (ent >> 11);
+        while (now > 0 && bits < 256) {
+            b32[bits / 8] |= val << (bits % 8);
+            now--;
+            bits++;
+        }
+    }
+}
+
+#endif