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Add mistate output to CSHA256.

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This allows the intermediate state of a SHA-256 run to be saved for future resumption, or in the case of fast Merkle trees to perform a non-padded hash.
This commit is contained in:
Mark Friedenbach 2016-01-22 08:19:17 -08:00 • committed by Gregory Sanders
parent cc49c12e0a
commit 29ad41dd56
2 changed files with 12 additions and 0 deletions
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11
src/crypto/sha256.cpp
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@ -171,6 +171,11 @@ void CSHA256::Finalize(unsigned char hash[OUTPUT_SIZE])
WriteBE64(sizedesc, bytes << 3);
Write(pad, 1 + ((119 - (bytes % 64)) % 64));
Write(sizedesc, 8);
Midstate(hash, NULL, NULL);
}
void CSHA256::Midstate(unsigned char hash[OUTPUT_SIZE], uint64_t* len, unsigned char *buffer)
{
WriteBE32(hash, s[0]);
WriteBE32(hash + 4, s[1]);
WriteBE32(hash + 8, s[2]);
@ -179,6 +184,12 @@ void CSHA256::Finalize(unsigned char hash[OUTPUT_SIZE])
WriteBE32(hash + 20, s[5]);
WriteBE32(hash + 24, s[6]);
WriteBE32(hash + 28, s[7]);
if (len) {
*len = bytes << 3;
}
if (buffer) {
memcpy(buffer, buf, bytes % 64);
}
}
CSHA256& CSHA256::Reset()

1
src/crypto/sha256.h
View file

@ -22,6 +22,7 @@ public:
CSHA256();
CSHA256& Write(const unsigned char* data, size_t len);
void Finalize(unsigned char hash[OUTPUT_SIZE]);
void Midstate(unsigned char hash[OUTPUT_SIZE], uint64_t* bytes, unsigned char *buffer);
CSHA256& Reset();
};