boost: moveonly: create eccryptoverify.h|cpp and move helper functions there

Eventually (after 0.10) these files will hold the logic for crypto
verification routines, and CKey/CPubKey will call into them.

1 files changed, 2 insertions, 51 deletions

diff --git a/src/key.cpp b/src/key.cpp
index c466e84f26..925b80ba0f 100644
--- a/src/key.cpp
+++ b/src/key.cpp
@@ -5,6 +5,7 @@
 #include "key.h"
 
 #include "crypto/sha2.h"
+#include "eccryptoverify.h"
 #include "random.h"
 
 #ifdef USE_SECP256K1
@@ -30,60 +31,10 @@ public:
 static CSecp256k1Init instance_of_csecp256k1;
 
 #endif
-
-int CompareBigEndian(const unsigned char *c1, size_t c1len, const unsigned char *c2, size_t c2len) {
-    while (c1len > c2len) {
-        if (*c1)
-            return 1;
-        c1++;
-        c1len--;
-    }
-    while (c2len > c1len) {
-        if (*c2)
-            return -1;
-        c2++;
-        c2len--;
-    }
-    while (c1len > 0) {
-        if (*c1 > *c2)
-            return 1;
-        if (*c2 > *c1)
-            return -1;
-        c1++;
-        c2++;
-        c1len--;
-    }
-    return 0;
-}
-
-/** Order of secp256k1's generator minus 1. */
-const unsigned char vchMaxModOrder[32] = {
-    0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
-    0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFE,
-    0xBA,0xAE,0xDC,0xE6,0xAF,0x48,0xA0,0x3B,
-    0xBF,0xD2,0x5E,0x8C,0xD0,0x36,0x41,0x40
-};
-
-/** Half of the order of secp256k1's generator minus 1. */
-const unsigned char vchMaxModHalfOrder[32] = {
-    0x7F,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
-    0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
-    0x5D,0x57,0x6E,0x73,0x57,0xA4,0x50,0x1D,
-    0xDF,0xE9,0x2F,0x46,0x68,0x1B,0x20,0xA0
-};
-
-const unsigned char vchZero[1] = {0};
-
 } // anon namespace
 
 bool CKey::Check(const unsigned char *vch) {
-    return CompareBigEndian(vch, 32, vchZero, 0) > 0 &&
-           CompareBigEndian(vch, 32, vchMaxModOrder, 32) <= 0;
-}
-
-bool CKey::CheckSignatureElement(const unsigned char *vch, int len, bool half) {
-    return CompareBigEndian(vch, len, vchZero, 0) > 0 &&
-           CompareBigEndian(vch, len, half ? vchMaxModHalfOrder : vchMaxModOrder, 32) <= 0;
+    return eccrypto::Check(vch);
 }
 
 void CKey::MakeNewKey(bool fCompressedIn) {