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REVIEWED: ComputeSHA256()

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Ray 2025-11-11 17:15:40 +01:00
parent 78faf6a120
commit 4e8b087ffe
1 changed files with 21 additions and 18 deletions
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31
src/rcore.c
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@ -2894,7 +2894,7 @@ unsigned int *ComputeMD5(unsigned char *data, int dataSize)
// NOTE: Returns a static int[5] array (20 bytes)
unsigned int *ComputeSHA1(unsigned char *data, int dataSize)
{
#define ROTATE_LEFT(x, c) (((x) << (c)) | ((x) >> (32 - (c))))
#define SHA1_ROTATE_LEFT(x, c) (((x) << (c)) | ((x) >> (32 - (c))))
static unsigned int hash[5] = { 0 }; // Hash to be returned
@ -2937,7 +2937,7 @@ unsigned int *ComputeSHA1(unsigned char *data, int dataSize)
}
// Message schedule: extend the sixteen 32-bit words into eighty 32-bit words:
for (int i = 16; i < 80; i++) w[i] = ROTATE_LEFT(w[i-3] ^ w[i-8] ^ w[i-14] ^ w[i-16], 1);
for (int i = 16; i < 80; i++) w[i] = SHA1_ROTATE_LEFT(w[i-3] ^ w[i-8] ^ w[i-14] ^ w[i-16], 1);
// Initialize hash value for this chunk
unsigned int a = hash[0];
@ -2972,10 +2972,10 @@ unsigned int *ComputeSHA1(unsigned char *data, int dataSize)
k = 0xCA62C1D6;
}
unsigned int temp = ROTATE_LEFT(a, 5) + f + e + k + w[i];
unsigned int temp = SHA1_ROTATE_LEFT(a, 5) + f + e + k + w[i];
e = d;
d = c;
c = ROTATE_LEFT(b, 30);
c = SHA1_ROTATE_LEFT(b, 30);
b = a;
a = temp;
}
@ -2997,9 +2997,9 @@ unsigned int *ComputeSHA1(unsigned char *data, int dataSize)
// NOTE: Returns a static int[8] array (32 bytes)
unsigned int *ComputeSHA256(unsigned char *data, int dataSize)
{
#define ROTATE_RIGHT(x, c) ((x >> c) | (x << ((sizeof(unsigned int) * 8) - c)))
#define SHA256_A0(x) (ROTATE_RIGHT(x, 7) ^ ROTATE_RIGHT(x, 18) ^ (x >> 3))
#define SHA256_A1(x) (ROTATE_RIGHT(x, 17) ^ ROTATE_RIGHT(x, 19) ^ (x >> 10))
#define SHA256_ROTATE_RIGHT(x, c) ((x >> c) | (x << ((sizeof(unsigned int)*8) - c)))
#define SHA256_A0(x) (SHA256_ROTATE_RIGHT(x, 7) ^ SHA256_ROTATE_RIGHT(x, 18) ^ (x >> 3))
#define SHA256_A1(x) (SHA256_ROTATE_RIGHT(x, 17) ^ SHA256_ROTATE_RIGHT(x, 19) ^ (x >> 10))
static const unsigned int k[64] = {
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
@ -3020,7 +3020,7 @@ unsigned int *ComputeSHA256(unsigned char *data, int dataSize)
0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
};
static unsigned int hash[8];
static unsigned int hash[8] = { 0 };
hash[0] = 0x6A09e667;
hash[1] = 0xbb67ae85;
hash[2] = 0x3c6ef372;
@ -3033,12 +3033,14 @@ unsigned int *ComputeSHA256(unsigned char *data, int dataSize)
const unsigned long long int bitLen = ((unsigned long long int)dataSize)*8;
unsigned long long int paddedSize = dataSize + sizeof(dataSize);
paddedSize += (64 - (paddedSize%64));
unsigned char *buffer = RL_CALLOC(paddedSize, sizeof(unsigned char));
unsigned char *buffer = (unsigned char *)RL_CALLOC(paddedSize, sizeof(unsigned char));
memcpy(buffer, data, dataSize);
buffer[dataSize] = 0x80;
for (int i = 1; i <= sizeof(bitLen); i++)
{
buffer[(paddedSize - sizeof(bitLen)) + (i - 1)] = (bitLen >> (8*(sizeof(bitLen) - i))) & 0xFF;
}
for (unsigned long long int blockN = 0; blockN < paddedSize/64; blockN++)
{
@ -3052,11 +3054,10 @@ unsigned int *ComputeSHA256(unsigned char *data, int dataSize)
unsigned int h = hash[7];
unsigned char *block = buffer + (blockN*64);
unsigned int w[64];
unsigned int w[64] = { 0 };
for (int i = 0; i < 16; i++)
{
w[i] =
((unsigned int)block[i*4 + 0] << 24) |
w[i] = ((unsigned int)block[i*4 + 0] << 24) |
((unsigned int)block[i*4 + 1] << 16) |
((unsigned int)block[i*4 + 2] << 8) |
((unsigned int)block[i*4 + 3]);
@ -3065,10 +3066,10 @@ unsigned int *ComputeSHA256(unsigned char *data, int dataSize)
for (unsigned long long int t = 0; t < 64; t++)
{
unsigned int e1 = (ROTATE_RIGHT(e, 6) ^ ROTATE_RIGHT(e, 11) ^ ROTATE_RIGHT(e, 25));
unsigned int e1 = (SHA256_ROTATE_RIGHT(e, 6) ^ SHA256_ROTATE_RIGHT(e, 11) ^ SHA256_ROTATE_RIGHT(e, 25));
unsigned int ch = ((e & f) ^ (~e & g));
unsigned int t1 = (h + e1 + ch + k[t] + w[t]);
unsigned int e0 = (ROTATE_RIGHT(a, 2) ^ ROTATE_RIGHT(a, 13) ^ ROTATE_RIGHT(a, 22));
unsigned int e0 = (SHA256_ROTATE_RIGHT(a, 2) ^ SHA256_ROTATE_RIGHT(a, 13) ^ SHA256_ROTATE_RIGHT(a, 22));
unsigned int maj = ((a & b) ^ (a & c) ^ (b & c));
unsigned int t2 = e0 + maj;
@ -3091,7 +3092,9 @@ unsigned int *ComputeSHA256(unsigned char *data, int dataSize)
hash[6] += g;
hash[7] += h;
}
RL_FREE(buffer);
return hash;
}