diff options
Diffstat (limited to 'crypto/bn/bn_shift.c')
| -rw-r--r-- | crypto/bn/bn_shift.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/crypto/bn/bn_shift.c b/crypto/bn/bn_shift.c index 0883247384..70f785ea18 100644 --- a/crypto/bn/bn_shift.c +++ b/crypto/bn/bn_shift.c @@ -60,7 +60,7 @@ #include "cryptlib.h" #include "bn_lcl.h" -int BN_lshift1(BIGNUM *r, BIGNUM *a) +int BN_lshift1(BIGNUM *r, const BIGNUM *a) { register BN_ULONG *ap,*rp,t,c; int i; @@ -92,7 +92,7 @@ int BN_lshift1(BIGNUM *r, BIGNUM *a) return(1); } -int BN_rshift1(BIGNUM *r, BIGNUM *a) +int BN_rshift1(BIGNUM *r, const BIGNUM *a) { BN_ULONG *ap,*rp,t,c; int i; @@ -128,8 +128,8 @@ int BN_lshift(BIGNUM *r, const BIGNUM *a, int n) BN_ULONG l; r->neg=a->neg; - if (bn_wexpand(r,a->top+(n/BN_BITS2)+1) == NULL) return(0); nw=n/BN_BITS2; + if (bn_wexpand(r,a->top+nw+1) == NULL) return(0); lb=n%BN_BITS2; rb=BN_BITS2-lb; f=a->d; @@ -153,7 +153,7 @@ int BN_lshift(BIGNUM *r, const BIGNUM *a, int n) return(1); } -int BN_rshift(BIGNUM *r, BIGNUM *a, int n) +int BN_rshift(BIGNUM *r, const BIGNUM *a, int n) { int i,j,nw,lb,rb; BN_ULONG *t,*f; @@ -172,6 +172,11 @@ int BN_rshift(BIGNUM *r, BIGNUM *a, int n) r->neg=a->neg; if (bn_wexpand(r,a->top-nw+1) == NULL) return(0); } + else + { + if (n == 0) + return 1; /* or the copying loop will go berserk */ + } f= &(a->d[nw]); t=r->d; |