diff options
| author | Ulf Möller <ulf@openssl.org> | 2000-02-05 14:17:32 +0000 |
|---|---|---|
| committer | Ulf Möller <ulf@openssl.org> | 2000-02-05 14:17:32 +0000 |
| commit | 9b141126d4b6f0636bc047e81b846c193ae26611 (patch) | |
| tree | c8786c99bfccc8b9899cad5c3aa30f29ada5e1b9 /crypto/bn/bn_mont.c | |
| parent | 7e708ebee066d0308a335579b546326220dc8317 (diff) | |
| download | openssl-9b141126d4b6f0636bc047e81b846c193ae26611.tar.gz | |
New functions BN_CTX_start(), BN_CTX_get(), BN_CTX_end() to access
temporary BIGNUMs. BN_CTX still uses a fixed number of BIGNUMs, but
the BN_CTX implementation could now easily be changed.
Diffstat (limited to 'crypto/bn/bn_mont.c')
| -rw-r--r-- | crypto/bn/bn_mont.c | 23 |
1 files changed, 14 insertions, 9 deletions
diff --git a/crypto/bn/bn_mont.c b/crypto/bn/bn_mont.c index dd691112c2..35a30a0eeb 100644 --- a/crypto/bn/bn_mont.c +++ b/crypto/bn/bn_mont.c @@ -72,9 +72,10 @@ int BN_mod_mul_montgomery(BIGNUM *r, BIGNUM *a, BIGNUM *b, { BIGNUM *tmp,*tmp2; - tmp= &(ctx->bn[ctx->tos]); - tmp2= &(ctx->bn[ctx->tos]); - ctx->tos+=2; + BN_CTX_start(ctx); + tmp = BN_CTX_get(ctx); + tmp2 = BN_CTX_get(ctx); + if (tmp == NULL || tmp2 == NULL) goto err; bn_check_top(tmp); bn_check_top(tmp2); @@ -98,16 +99,20 @@ int BN_mod_mul_montgomery(BIGNUM *r, BIGNUM *a, BIGNUM *b, } /* reduce from aRR to aR */ if (!BN_from_montgomery(r,tmp,mont,ctx)) goto err; - ctx->tos-=2; + BN_CTX_end(ctx); return(1); err: return(0); } +#define BN_RECURSION_MONT + int BN_from_montgomery(BIGNUM *ret, BIGNUM *a, BN_MONT_CTX *mont, BN_CTX *ctx) { int retn=0; + BN_CTX_start(ctx); + #ifdef BN_RECURSION_MONT if (mont->use_word) #endif @@ -116,7 +121,7 @@ int BN_from_montgomery(BIGNUM *ret, BIGNUM *a, BN_MONT_CTX *mont, BN_ULONG *ap,*np,*rp,n0,v,*nrp; int al,nl,max,i,x,ri; - r= &(ctx->bn[ctx->tos]); + if ((r = BN_CTX_get(ctx)) == NULL) goto err; if (!BN_copy(r,a)) goto err; n= &(mont->N); @@ -210,9 +215,9 @@ printf("word BN_from_montgomery %d * %d\n",nl,nl); { BIGNUM *t1,*t2; - t1=&(ctx->bn[ctx->tos]); - t2=&(ctx->bn[ctx->tos+1]); - ctx->tos+=2; + t1 = BN_CTX_get(ctx); + t2 = BN_CTX_get(ctx); + if (t1 == NULL || t2 == NULL) goto err; if (!BN_copy(t1,a)) goto err; BN_mask_bits(t1,mont->ri); @@ -226,11 +231,11 @@ printf("word BN_from_montgomery %d * %d\n",nl,nl); if (BN_ucmp(ret,&mont->N) >= 0) BN_usub(ret,ret,&mont->N); - ctx->tos-=2; retn=1; } #endif err: + BN_CTX_end(ctx); return(retn); } |