diff options
| -rw-r--r-- | lib/crypto/sha256.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/lib/crypto/sha256.c b/lib/crypto/sha256.c index 099cd11f83c1..c6bfeacc5b81 100644 --- a/lib/crypto/sha256.c +++ b/lib/crypto/sha256.c @@ -43,10 +43,9 @@ static inline void BLEND_OP(int I, u32 *W) W[I] = s1(W[I-2]) + W[I-7] + s0(W[I-15]) + W[I-16]; } -static void sha256_transform(u32 *state, const u8 *input) +static void sha256_transform(u32 *state, const u8 *input, u32 *W) { u32 a, b, c, d, e, f, g, h, t1, t2; - u32 W[64]; int i; /* load the input */ @@ -200,15 +199,13 @@ static void sha256_transform(u32 *state, const u8 *input) state[0] += a; state[1] += b; state[2] += c; state[3] += d; state[4] += e; state[5] += f; state[6] += g; state[7] += h; - - /* clear any sensitive info... */ - memzero_explicit(W, 64 * sizeof(u32)); } void sha256_update(struct sha256_state *sctx, const u8 *data, unsigned int len) { unsigned int partial, done; const u8 *src; + u32 W[64]; partial = sctx->count & 0x3f; sctx->count += len; @@ -223,11 +220,13 @@ void sha256_update(struct sha256_state *sctx, const u8 *data, unsigned int len) } do { - sha256_transform(sctx->state, src); + sha256_transform(sctx->state, src, W); done += 64; src = data + done; } while (done + 63 < len); + memzero_explicit(W, sizeof(W)); + partial = 0; } memcpy(sctx->buf + partial, src, len - done); |