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feat(sha1): add SHA1_InterleaveHash

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fallenoak 2023-02-06 17:00:19 -06:00
parent ca7b7c3bc6
commit 04ee35a71b
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GPG key ID: 7628F8E61AEA070D
3 changed files with 89 additions and 0 deletions
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55
common/SHA1.cpp
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@ -1,4 +1,5 @@
#include "common/SHA1.hpp"
#include <cstdlib>
#include <cstring>
#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
@ -61,6 +62,60 @@ void SHA1_Init(SHA1_CONTEXT* context) {
context->count[1] = 0;
}
uint8_t* SHA1_InterleaveHash(uint8_t* const digest, const uint8_t* data, uint32_t len) {
// Terminate data at first null
uint32_t l;
for (l = len; l; l--) {
if (*data) {
break;
}
data++;
}
if (l & 1) {
data++;
l--;
}
SHA1_CONTEXT ctx;
uint8_t scratchDigest[SHA1_DIGEST_SIZE];
auto scratchLen = l / 2;
auto scratch = static_cast<uint8_t*>(alloca(scratchLen));
if (!scratch) {
return nullptr;
}
// Even half
for (uint32_t i = 0; i < scratchLen; i++) {
scratch[i] = data[i * 2];
}
SHA1_Init(&ctx);
SHA1_Update(&ctx, scratch, scratchLen);
SHA1_Final(scratchDigest, &ctx);
for (uint32_t i = 0; i < sizeof(scratchDigest); i++) {
digest[i * 2] = scratchDigest[i];
}
// Odd half
for (uint32_t i = 0; i < scratchLen; i++) {
scratch[i] = data[i * 2 + 1];
}
SHA1_Init(&ctx);
SHA1_Update(&ctx, scratch, scratchLen);
SHA1_Final(scratchDigest, &ctx);
for (uint32_t i = 0; i < sizeof(scratchDigest); i++) {
digest[i * 2 + 1] = scratchDigest[i];
}
return digest;
}
void SHA1_Transform(uint32_t state[5], const uint8_t buffer[64]) {
uint32_t a, b, c, d, e;
typedef union {

2
common/SHA1.hpp
View file

@ -15,6 +15,8 @@ void SHA1_Final(uint8_t* const digest, SHA1_CONTEXT* context);
void SHA1_Init(SHA1_CONTEXT* context);
uint8_t* SHA1_InterleaveHash(uint8_t* digest, const uint8_t* data, uint32_t len);
void SHA1_Update(SHA1_CONTEXT* context, const uint8_t* data, uint32_t len);
#endif