diff options
Diffstat (limited to 'crypto/bn/bn_word.c')
| -rw-r--r-- | crypto/bn/bn_word.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/crypto/bn/bn_word.c b/crypto/bn/bn_word.c index 7aa2a33d2d..1bcb37e292 100644 --- a/crypto/bn/bn_word.c +++ b/crypto/bn/bn_word.c @@ -87,7 +87,7 @@ BN_ULONG BN_mod_word(const BIGNUM *a, BN_ULONG w) BN_ULONG BN_div_word(BIGNUM *a, BN_ULONG w) { BN_ULONG ret = 0; - int i; + int i, j; bn_check_top(a); w &= BN_MASK2; @@ -98,6 +98,12 @@ BN_ULONG BN_div_word(BIGNUM *a, BN_ULONG w) if (a->top == 0) return 0; + /* normalize input (so bn_div_words doesn't complain) */ + j = BN_BITS2 - BN_num_bits_word(w); + w <<= j; + if (!BN_lshift(a, a, j)) + return 0; + for (i=a->top-1; i>=0; i--) { BN_ULONG l,d; @@ -109,6 +115,7 @@ BN_ULONG BN_div_word(BIGNUM *a, BN_ULONG w) } if ((a->top > 0) && (a->d[a->top-1] == 0)) a->top--; + ret >>= j; bn_check_top(a); return(ret); } |