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-rw-r--r--crypto/secp256k1/libsecp256k1/src/testrand_impl.h60
1 files changed, 60 insertions, 0 deletions
diff --git a/crypto/secp256k1/libsecp256k1/src/testrand_impl.h b/crypto/secp256k1/libsecp256k1/src/testrand_impl.h
new file mode 100644
index 000000000..7c3554266
--- /dev/null
+++ b/crypto/secp256k1/libsecp256k1/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"
+#include "hash.h"
+
+static secp256k1_rfc6979_hmac_sha256_t secp256k1_test_rng;
+static uint32_t secp256k1_test_rng_precomputed[8];
+static int secp256k1_test_rng_precomputed_used = 8;
+
+SECP256K1_INLINE static void secp256k1_rand_seed(const unsigned char *seed16) {
+ secp256k1_rfc6979_hmac_sha256_initialize(&secp256k1_test_rng, seed16, 16);
+}
+
+SECP256K1_INLINE static uint32_t secp256k1_rand32(void) {
+ if (secp256k1_test_rng_precomputed_used == 8) {
+ secp256k1_rfc6979_hmac_sha256_generate(&secp256k1_test_rng, (unsigned char*)(&secp256k1_test_rng_precomputed[0]), sizeof(secp256k1_test_rng_precomputed));
+ secp256k1_test_rng_precomputed_used = 0;
+ }
+ return secp256k1_test_rng_precomputed[secp256k1_test_rng_precomputed_used++];
+}
+
+static void secp256k1_rand256(unsigned char *b32) {
+ secp256k1_rfc6979_hmac_sha256_generate(&secp256k1_test_rng, b32, 32);
+}
+
+static void secp256k1_rand256_test(unsigned char *b32) {
+ int bits=0;
+ uint64_t ent = 0;
+ int entleft = 0;
+ memset(b32, 0, 32);
+ while (bits < 256) {
+ int now;
+ uint32_t val;
+ if (entleft < 12) {
+ ent |= ((uint64_t)secp256k1_rand32()) << entleft;
+ entleft += 32;
+ }
+ now = 1 + ((ent % 64)*((ent >> 6) % 32)+16)/31;
+ val = 1 & (ent >> 11);
+ ent >>= 12;
+ entleft -= 12;
+ while (now > 0 && bits < 256) {
+ b32[bits / 8] |= val << (bits % 8);
+ now--;
+ bits++;
+ }
+ }
+}
+
+#endif