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Use internal SHA256 in scrypt HMAC

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root
2026-04-28 06:36:26 +00:00
parent f3be3404d6
commit 11b3cb89a8
1 changed files with 12 additions and 14 deletions
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src/crypto/scrypt.cpp
+12 -14
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@@ -28,9 +28,9 @@
*/
#include "crypto/scrypt.h"
#include "crypto/sha256.h"
#include "uint256.h"
#include "utilstrencodings.h"
#include <openssl/sha.h>
#include <string>
#include <string.h>
@@ -48,8 +48,8 @@ static inline void be32enc(void *pp, uint32_t x)
#endif
typedef struct HMAC_SHA256Context {
SHA256_CTX ictx;
SHA256_CTX octx;
CSHA256 ictx;
CSHA256 octx;
} HMAC_SHA256_CTX;
/* Initialize an HMAC-SHA256 operation with the given key. */
@@ -63,26 +63,24 @@ HMAC_SHA256_Init(HMAC_SHA256_CTX *ctx, const void *_K, size_t Klen)
/* If Klen > 64, the key is really SHA256(K). */
if (Klen > 64) {
SHA256_Init(&ctx->ictx);
SHA256_Update(&ctx->ictx, K, Klen);
SHA256_Final(khash, &ctx->ictx);
ctx->ictx.Reset().Write(K, Klen).Finalize(khash);
K = khash;
Klen = 32;
}
/* Inner SHA256 operation is SHA256(K xor [block of 0x36] || data). */
SHA256_Init(&ctx->ictx);
ctx->ictx.Reset();
memset(pad, 0x36, 64);
for (i = 0; i < Klen; i++)
pad[i] ^= K[i];
SHA256_Update(&ctx->ictx, pad, 64);
ctx->ictx.Write(pad, 64);
/* Outer SHA256 operation is SHA256(K xor [block of 0x5c] || hash). */
SHA256_Init(&ctx->octx);
ctx->octx.Reset();
memset(pad, 0x5c, 64);
for (i = 0; i < Klen; i++)
pad[i] ^= K[i];
SHA256_Update(&ctx->octx, pad, 64);
ctx->octx.Write(pad, 64);
/* Clean the stack. */
memset(khash, 0, 32);
@@ -93,7 +91,7 @@ static void
HMAC_SHA256_Update(HMAC_SHA256_CTX *ctx, const void *in, size_t len)
{
/* Feed data to the inner SHA256 operation. */
SHA256_Update(&ctx->ictx, in, len);
ctx->ictx.Write((const unsigned char*)in, len);
}
/* Finish an HMAC-SHA256 operation. */
@@ -103,13 +101,13 @@ HMAC_SHA256_Final(unsigned char digest[32], HMAC_SHA256_CTX *ctx)
unsigned char ihash[32];
/* Finish the inner SHA256 operation. */
SHA256_Final(ihash, &ctx->ictx);
ctx->ictx.Finalize(ihash);
/* Feed the inner hash to the outer SHA256 operation. */
SHA256_Update(&ctx->octx, ihash, 32);
ctx->octx.Write(ihash, 32);
/* Finish the outer SHA256 operation. */
SHA256_Final(digest, &ctx->octx);
ctx->octx.Finalize(digest);
/* Clean the stack. */
memset(ihash, 0, 32);