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Inline ChaCha20 32-byte specific constants

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This commit is contained in:
Pieter Wuille
2022-09-21 18:01:57 -04:00
parent 62ec713961
commit 93aee8bbda
3 changed files with 71 additions and 84 deletions
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138
src/crypto/chacha20.cpp
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@@ -21,26 +21,20 @@ constexpr static inline uint32_t rotl32(uint32_t v, int c) { return (v << c) | (
#define REPEAT10(a) do { {a}; {a}; {a}; {a}; {a}; {a}; {a}; {a}; {a}; {a}; } while(0)
static const unsigned char sigma[] = "expand 32-byte k";
void ChaCha20Aligned::SetKey32(const unsigned char* k)
{
input[0] = ReadLE32(sigma + 0);
input[1] = ReadLE32(sigma + 4);
input[2] = ReadLE32(sigma + 8);
input[3] = ReadLE32(sigma + 12);
input[4] = ReadLE32(k + 0);
input[5] = ReadLE32(k + 4);
input[6] = ReadLE32(k + 8);
input[7] = ReadLE32(k + 12);
input[8] = ReadLE32(k + 16);
input[9] = ReadLE32(k + 20);
input[10] = ReadLE32(k + 24);
input[11] = ReadLE32(k + 28);
input[12] = 0;
input[13] = 0;
input[14] = 0;
input[15] = 0;
input[0] = ReadLE32(k + 0);
input[1] = ReadLE32(k + 4);
input[2] = ReadLE32(k + 8);
input[3] = ReadLE32(k + 12);
input[4] = ReadLE32(k + 16);
input[5] = ReadLE32(k + 20);
input[6] = ReadLE32(k + 24);
input[7] = ReadLE32(k + 28);
input[8] = 0;
input[9] = 0;
input[10] = 0;
input[11] = 0;
}
ChaCha20Aligned::ChaCha20Aligned()
@@ -55,45 +49,41 @@ ChaCha20Aligned::ChaCha20Aligned(const unsigned char* key32)
void ChaCha20Aligned::SetIV(uint64_t iv)
{
input[14] = iv;
input[15] = iv >> 32;
input[10] = iv;
input[11] = iv >> 32;
}
void ChaCha20Aligned::Seek64(uint64_t pos)
{
input[12] = pos;
input[13] = pos >> 32;
input[8] = pos;
input[9] = pos >> 32;
}
inline void ChaCha20Aligned::Keystream64(unsigned char* c, size_t blocks)
{
uint32_t x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15;
uint32_t j0, j1, j2, j3, j4, j5, j6, j7, j8, j9, j10, j11, j12, j13, j14, j15;
uint32_t j4, j5, j6, j7, j8, j9, j10, j11, j12, j13, j14, j15;
if (!blocks) return;
j0 = input[0];
j1 = input[1];
j2 = input[2];
j3 = input[3];
j4 = input[4];
j5 = input[5];
j6 = input[6];
j7 = input[7];
j8 = input[8];
j9 = input[9];
j10 = input[10];
j11 = input[11];
j12 = input[12];
j13 = input[13];
j14 = input[14];
j15 = input[15];
j4 = input[0];
j5 = input[1];
j6 = input[2];
j7 = input[3];
j8 = input[4];
j9 = input[5];
j10 = input[6];
j11 = input[7];
j12 = input[8];
j13 = input[9];
j14 = input[10];
j15 = input[11];
for (;;) {
x0 = j0;
x1 = j1;
x2 = j2;
x3 = j3;
x0 = 0x61707865;
x1 = 0x3320646e;
x2 = 0x79622d32;
x3 = 0x6b206574;
x4 = j4;
x5 = j5;
x6 = j6;
@@ -119,10 +109,10 @@ inline void ChaCha20Aligned::Keystream64(unsigned char* c, size_t blocks)
QUARTERROUND( x3, x4, x9,x14);
);
x0 += j0;
x1 += j1;
x2 += j2;
x3 += j3;
x0 += 0x61707865;
x1 += 0x3320646e;
x2 += 0x79622d32;
x3 += 0x6b206574;
x4 += j4;
x5 += j5;
x6 += j6;
@@ -157,8 +147,8 @@ inline void ChaCha20Aligned::Keystream64(unsigned char* c, size_t blocks)
WriteLE32(c + 60, x15);
if (blocks == 1) {
input[12] = j12;
input[13] = j13;
input[8] = j12;
input[9] = j13;
return;
}
blocks -= 1;
@@ -169,32 +159,28 @@ inline void ChaCha20Aligned::Keystream64(unsigned char* c, size_t blocks)
inline void ChaCha20Aligned::Crypt64(const unsigned char* m, unsigned char* c, size_t blocks)
{
uint32_t x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15;
uint32_t j0, j1, j2, j3, j4, j5, j6, j7, j8, j9, j10, j11, j12, j13, j14, j15;
uint32_t j4, j5, j6, j7, j8, j9, j10, j11, j12, j13, j14, j15;
if (!blocks) return;
j0 = input[0];
j1 = input[1];
j2 = input[2];
j3 = input[3];
j4 = input[4];
j5 = input[5];
j6 = input[6];
j7 = input[7];
j8 = input[8];
j9 = input[9];
j10 = input[10];
j11 = input[11];
j12 = input[12];
j13 = input[13];
j14 = input[14];
j15 = input[15];
j4 = input[0];
j5 = input[1];
j6 = input[2];
j7 = input[3];
j8 = input[4];
j9 = input[5];
j10 = input[6];
j11 = input[7];
j12 = input[8];
j13 = input[9];
j14 = input[10];
j15 = input[11];
for (;;) {
x0 = j0;
x1 = j1;
x2 = j2;
x3 = j3;
x0 = 0x61707865;
x1 = 0x3320646e;
x2 = 0x79622d32;
x3 = 0x6b206574;
x4 = j4;
x5 = j5;
x6 = j6;
@@ -220,10 +206,10 @@ inline void ChaCha20Aligned::Crypt64(const unsigned char* m, unsigned char* c, s
QUARTERROUND( x3, x4, x9,x14);
);
x0 += j0;
x1 += j1;
x2 += j2;
x3 += j3;
x0 += 0x61707865;
x1 += 0x3320646e;
x2 += 0x79622d32;
x3 += 0x6b206574;
x4 += j4;
x5 += j5;
x6 += j6;
@@ -275,8 +261,8 @@ inline void ChaCha20Aligned::Crypt64(const unsigned char* m, unsigned char* c, s
WriteLE32(c + 60, x15);
if (blocks == 1) {
input[12] = j12;
input[13] = j13;
input[8] = j12;
input[9] = j13;
return;
}
blocks -= 1;