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Add TaggedHash function (BIP 340)

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This adds the TaggedHash function as defined by BIP340 to the hash module, which
is used in BIP340 and BIP341 to produce domain-separated hashes.
This commit is contained in:
Pieter Wuille 2020-09-11 14:32:50 -07:00
parent 450d2b2371
commit 9eb590894f
2 changed files with 19 additions and 0 deletions
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10
src/hash.cpp
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@ -6,6 +6,7 @@
#include <crypto/common.h> #include <crypto/common.h>
#include <crypto/hmac_sha512.h> #include <crypto/hmac_sha512.h>
#include <string>
inline uint32_t ROTL32(uint32_t x, int8_t r) inline uint32_t ROTL32(uint32_t x, int8_t r)
{ {
@ -84,3 +85,12 @@ uint256 SHA256Uint256(const uint256& input)
CSHA256().Write(input.begin(), 32).Finalize(result.begin()); CSHA256().Write(input.begin(), 32).Finalize(result.begin());
return result; return result;
} }
CHashWriter TaggedHash(const std::string& tag)
{
CHashWriter writer(SER_GETHASH, 0);
uint256 taghash;
CSHA256().Write((const unsigned char*)tag.data(), tag.size()).Finalize(taghash.begin());
writer << taghash << taghash;
return writer;
}

9
src/hash.h
View file

@ -15,6 +15,7 @@
#include <uint256.h> #include <uint256.h>
#include <version.h> #include <version.h>
#include <string>
#include <vector> #include <vector>
typedef uint256 ChainCode; typedef uint256 ChainCode;
@ -202,4 +203,12 @@ unsigned int MurmurHash3(unsigned int nHashSeed, Span<const unsigned char> vData
void BIP32Hash(const ChainCode &chainCode, unsigned int nChild, unsigned char header, const unsigned char data[32], unsigned char output[64]); void BIP32Hash(const ChainCode &chainCode, unsigned int nChild, unsigned char header, const unsigned char data[32], unsigned char output[64]);
/** Return a CHashWriter primed for tagged hashes (as specified in BIP 340).
*
* The returned object will have SHA256(tag) written to it twice (= 64 bytes).
* A tagged hash can be computed by feeding the message into this object, and
* then calling CHashWriter::GetSHA256().
*/
CHashWriter TaggedHash(const std::string& tag);
#endif // BITCOIN_HASH_H #endif // BITCOIN_HASH_H