diff options
Diffstat (limited to 'src/lib/math/mp/mp_monty.cpp')
| -rw-r--r-- | src/lib/math/mp/mp_monty.cpp | 22 |
1 files changed, 13 insertions, 9 deletions
diff --git a/src/lib/math/mp/mp_monty.cpp b/src/lib/math/mp/mp_monty.cpp index 2599266b0..cc6388f4d 100644 --- a/src/lib/math/mp/mp_monty.cpp +++ b/src/lib/math/mp/mp_monty.cpp @@ -20,11 +20,14 @@ namespace Botan { * Montgomery Reduction Algorithm */ void bigint_monty_redc(word z[], - const word p[], size_t p_size, - word p_dash, word ws[]) + const word p[], size_t p_size, word p_dash, + word ws[], size_t ws_size) { const size_t z_size = 2*(p_size+1); + if(ws_size < z_size) + throw Invalid_Argument("bigint_monty_redc workspace too small"); + CT::poison(z, z_size); CT::poison(p, p_size); CT::poison(ws, 2*(p_size+1)); @@ -96,24 +99,25 @@ void bigint_monty_redc(word z[], void bigint_monty_mul(BigInt& z, const BigInt& x, const BigInt& y, const word p[], size_t p_size, word p_dash, - word ws[]) + word ws[], size_t ws_size) { - bigint_mul(z, x, y, &ws[0]); + bigint_mul(z, x, y, ws, ws_size); bigint_monty_redc(z.mutable_data(), p, p_size, p_dash, - ws); + ws, ws_size); } void bigint_monty_sqr(BigInt& z, const BigInt& x, const word p[], - size_t p_size, word p_dash, word ws[]) + size_t p_size, word p_dash, word ws[], size_t ws_size) { - bigint_sqr(z.mutable_data(), z.size(), &ws[0], - x.data(), x.size(), x.sig_words()); + bigint_sqr(z.mutable_data(), z.size(), + x.data(), x.size(), x.sig_words(), + ws, ws_size); bigint_monty_redc(z.mutable_data(), p, p_size, p_dash, - ws); + ws, ws_size); } } |