public static void MY_SHA0_final(MY_SHA0_CTX *ctx)
{
UCHAR *p = ctx->buf;
UINT64 cnt = ctx->count * 8;
int i;
var x = new byte[1] {
0x80
};
MY_SHA0_update(ctx, x);
var zero = new byte[1] {
0x00
};
while ((ctx->count & 63) != 56)
{
MY_SHA0_update(ctx, zero);
}
Span <byte> t = new byte[1];
for (i = 0; i < 8; ++i)
{
t[0] = (UCHAR)(cnt >> ((7 - i) * 8));
MY_SHA0_update(ctx, t);
}
for (i = 0; i < 5; i++)
{
UINT tmp = ctx->state[i];
* p++ = (BYTE)(tmp >> 24);
* p++ = (BYTE)(tmp >> 16);
* p++ = (BYTE)(tmp >> 8);
* p++ = (BYTE)(tmp >> 0);
}
}
public static void MY_SHA0_Transform(MY_SHA0_CTX *ctx)
{
Span <UINT> W = stackalloc UINT[80];
UINT A, B, C, D, E;
UCHAR * p = ctx->buf;
int t;
for (t = 0; t < 16; ++t)
{
UINT tmp = (UINT)(*p++) << 24;
tmp |= (UINT)(*p++) << 16;
tmp |= (UINT)(*p++) << 8;
tmp |= (UINT)(*p++);
W[t] = tmp;
}
for (; t < 80; t++)
{
//W[t] = rol(1,W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16]);
W[t] = (W[t - 3] ^ W[t - 8] ^ W[t - 14] ^ W[t - 16]);
}
A = ctx->state[0];
B = ctx->state[1];
C = ctx->state[2];
D = ctx->state[3];
E = ctx->state[4];
for (t = 0; t < 80; t++)
{
UINT tmp = rol(5, A) + E + W[t];
if (t < 20)
{
tmp += (D ^ (B & (C ^ D))) + 0x5A827999;
}
else if (t < 40)
{
tmp += (B ^ C ^ D) + 0x6ED9EBA1;
}
else if (t < 60)
{
tmp += ((B & C) | (D & (B | C))) + 0x8F1BBCDC;
}
else
{
tmp += (B ^ C ^ D) + 0xCA62C1D6;
}
E = D;
D = C;
C = rol(30, B);
B = A;
A = tmp;
}
ctx->state[0] += A;
ctx->state[1] += B;
ctx->state[2] += C;
ctx->state[3] += D;
ctx->state[4] += E;
}
public static void MY_SHA0_init(MY_SHA0_CTX *ctx)
{
//ctx->f = &SHA_VTAB;
ctx->state[0] = 0x67452301;
ctx->state[1] = 0xEFCDAB89;
ctx->state[2] = 0x98BADCFE;
ctx->state[3] = 0x10325476;
ctx->state[4] = 0xC3D2E1F0;
ctx->count = 0;
}
public static void MY_SHA0_update(MY_SHA0_CTX *ctx, ReadOnlySpan <byte> data)
{
UINT len = (UINT)data.Length;
int i = (int)(ctx->count & 63);
fixed(UCHAR *ptr = data)
{
UCHAR *p = ptr;
ctx->count += len;
while (len-- != 0)
{
ctx->buf[i++] = *p++;
if (i == 64)
{
MY_SHA0_Transform(ctx);
i = 0;
}
}
}
}
