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Some extra comments

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This commit is contained in:
Pieter Wuille
2011-11-07 00:05:42 +01:00
parent 81a28d7a6f
commit d825e6a31b
7 changed files with 80 additions and 9 deletions
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16
src/key.h
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@@ -39,6 +39,7 @@
// see www.keylength.com
// script supports up to 75 for single byte push
// Generate a private key from just the secret parameter
int static inline EC_KEY_regenerate_key(EC_KEY *eckey, BIGNUM *priv_key)
{
int ok = 0;
@@ -75,6 +76,9 @@ err:
return(ok);
}
// Perform ECDSA key recovery (see SEC1 4.1.6) for curves over (mod p)-fields
// recid selects which key is recovered
// if check is nonzero, additional checks are performed
int static inline ECDSA_SIG_recover_key_GFp(EC_KEY *eckey, ECDSA_SIG *ecsig, const unsigned char *msg, int msglen, int recid, int check)
{
if (!eckey) return 0;
@@ -154,7 +158,9 @@ public:
// secure_allocator is defined in serialize.h
// CPrivKey is a serialized private key, with all parameters included (279 bytes)
typedef std::vector<unsigned char, secure_allocator<unsigned char> > CPrivKey;
// CSecret is a serialization of just the secret parameter (32 bytes)
typedef std::vector<unsigned char, secure_allocator<unsigned char> > CSecret;
class CKey
@@ -292,6 +298,9 @@ public:
}
// create a compact signature (65 bytes), which allows reconstructing the used public key
// The format is one header byte, followed by two times 32 bytes for the serialized r and s values.
// The header byte: 0x1B = first key with even y, 0x1C = first key with odd y,
// 0x1D = second key with even y, 0x1E = second key with odd y
bool SignCompact(uint256 hash, std::vector<unsigned char>& vchSig)
{
bool fOk = false;
@@ -318,7 +327,7 @@ public:
}
if (nRecId == -1)
throw key_error("CKEy::SignCompact() : unable to construct recoverable key");
throw key_error("CKey::SignCompact() : unable to construct recoverable key");
vchSig[0] = nRecId+27;
BN_bn2bin(sig->r,&vchSig[33-(nBitsR+7)/8]);
@@ -330,6 +339,9 @@ public:
}
// reconstruct public key from a compact signature
// This is only slightly more CPU intensive than just verifying it.
// If this function succeeds, the recovered public key is guaranteed to be valid
// (the signature is a valid signature of the given data for that key)
bool SetCompactSignature(uint256 hash, const std::vector<unsigned char>& vchSig)
{
if (vchSig.size() != 65)
@@ -359,6 +371,7 @@ public:
return true;
}
// Verify a compact signature
bool VerifyCompact(uint256 hash, const std::vector<unsigned char>& vchSig)
{
CKey key;
@@ -369,6 +382,7 @@ public:
return true;
}
// Get the address corresponding to this key
CBitcoinAddress GetAddress() const
{
return CBitcoinAddress(GetPubKey());