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Only support 32-byte keys in ChaCha20{,Aligned}

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This commit is contained in:
Pieter Wuille
2022-09-21 17:39:48 -04:00
parent f21994a02e
commit 62ec713961
9 changed files with 46 additions and 53 deletions
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31
src/crypto/chacha20.cpp
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@@ -22,30 +22,21 @@ 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";
static const unsigned char tau[] = "expand 16-byte k";
void ChaCha20Aligned::SetKey(const unsigned char* k, size_t keylen)
void ChaCha20Aligned::SetKey32(const unsigned char* k)
{
const unsigned char *constants;
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);
if (keylen == 32) { /* recommended */
k += 16;
constants = sigma;
} else { /* keylen == 16 */
constants = tau;
}
input[8] = ReadLE32(k + 0);
input[9] = ReadLE32(k + 4);
input[10] = ReadLE32(k + 8);
input[11] = ReadLE32(k + 12);
input[0] = ReadLE32(constants + 0);
input[1] = ReadLE32(constants + 4);
input[2] = ReadLE32(constants + 8);
input[3] = ReadLE32(constants + 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;
@@ -57,9 +48,9 @@ ChaCha20Aligned::ChaCha20Aligned()
memset(input, 0, sizeof(input));
}
ChaCha20Aligned::ChaCha20Aligned(const unsigned char* k, size_t keylen)
ChaCha20Aligned::ChaCha20Aligned(const unsigned char* key32)
{
SetKey(k, keylen);
SetKey32(key32);
}
void ChaCha20Aligned::SetIV(uint64_t iv)