mirror/openssl
2
0
Fork 0
mirror of https://github.com/openssl/openssl.git synced 2024-12-03 05:41:46 +08:00
Code Issues Packages Projects Releases Wiki Activity

This is the least unacceptable way I've found for declaring the bignum data

Browse Source 
and structures as constant without having to cast away const at any point.
There is still plenty of other code that makes gcc's "-Wcast-qual" unhappy,
but crypto/bn/ is now ok. Purists are welcome to suggest alternatives.
This commit is contained in:
Geoff Thorpe 2003-11-04 00:29:09 +00:00
parent 933398f110
commit c465e7941e
3 changed files with 45 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
crypto/bn/bn.h
View File

@ -252,6 +252,27 @@ typedef struct bignum_st
int flags;
} BIGNUM;
/* Declaring static BIGNUMs as constant is tricky in C; the 'd' data can't be
* pre-declared const without having to cast away the const when declaring the
* BIGNUM. We use this alternative type for declaring const BIGNUMs. See
* bn_nist.c for examples. */
typedef struct bignum_c_st
{
const BN_ULONG *d;
int top;
int dmax;
int neg;
int flags;
} BIGNUM_C;
#ifdef BN_DEBUG
/* Use a function to do this so that we can type-check the pointer we're
* casting */
const BIGNUM *BIGNUM_CONST(const BIGNUM_C *bn);
#else
/* Use a macro instead */
#define BIGNUM_CONST(bn) ((const BIGNUM *)bn)
#endif
/* Used for temp variables (declaration hidden in bn_lcl.h) */
typedef struct bignum_ctx BN_CTX;

8
crypto/bn/bn_lib.c
View File

@ -874,3 +874,11 @@ int bn_cmp_part_words(const BN_ULONG *a, const BN_ULONG *b,
}
return bn_cmp_words(a,b,cl);
}
/* See the comments surrounding BIGNUM_C in bn.h */
#ifdef BN_DEBUG
const BIGNUM *BIGNUM_CONST(const BIGNUM_C *bn)
{
return (const BIGNUM *)bn;
}
#endif

31
crypto/bn/bn_nist.c
View File

@ -127,39 +127,40 @@ const static BN_ULONG _nist_p_521[] = {0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0x01};
#endif
static const BIGNUM_C bn_nist_p_192 =
{ _nist_p_192, BN_NIST_192_TOP, BN_NIST_192_TOP, 0, BN_FLG_STATIC_DATA };
static const BIGNUM_C bn_nist_p_224 =
{ _nist_p_224, BN_NIST_224_TOP, BN_NIST_224_TOP, 0, BN_FLG_STATIC_DATA };
static const BIGNUM_C bn_nist_p_256 =
{ _nist_p_256, BN_NIST_256_TOP, BN_NIST_256_TOP, 0, BN_FLG_STATIC_DATA };
static const BIGNUM_C bn_nist_p_384 =
{ _nist_p_384, BN_NIST_384_TOP, BN_NIST_384_TOP, 0, BN_FLG_STATIC_DATA };
static const BIGNUM_C bn_nist_p_521 =
{ _nist_p_521, BN_NIST_521_TOP, BN_NIST_521_TOP, 0, BN_FLG_STATIC_DATA };
const BIGNUM *BN_get0_nist_prime_192(void)
{
static BIGNUM const_nist_192={(BN_ULONG *)_nist_p_192,BN_NIST_192_TOP,
BN_NIST_192_TOP, 0, BN_FLG_STATIC_DATA};
return &const_nist_192;
return BIGNUM_CONST(&bn_nist_p_192);
}
const BIGNUM *BN_get0_nist_prime_224(void)
{
static BIGNUM const_nist_224={(BN_ULONG *)_nist_p_224,BN_NIST_224_TOP,
BN_NIST_224_TOP, 0, BN_FLG_STATIC_DATA};
return &const_nist_224;
return BIGNUM_CONST(&bn_nist_p_224);
}
const BIGNUM *BN_get0_nist_prime_256(void)
{
static BIGNUM const_nist_256={(BN_ULONG *)_nist_p_256,BN_NIST_256_TOP,
BN_NIST_256_TOP, 0, BN_FLG_STATIC_DATA};
return &const_nist_256;
return BIGNUM_CONST(&bn_nist_p_256);
}
const BIGNUM *BN_get0_nist_prime_384(void)
{
static BIGNUM const_nist_384={(BN_ULONG *)_nist_p_384,BN_NIST_384_TOP,
BN_NIST_384_TOP, 0, BN_FLG_STATIC_DATA};
return &const_nist_384;
return BIGNUM_CONST(&bn_nist_p_384);
}
const BIGNUM *BN_get0_nist_prime_521(void)
{
static BIGNUM const_nist_521={(BN_ULONG *)_nist_p_521,BN_NIST_521_TOP,
BN_NIST_521_TOP, 0, BN_FLG_STATIC_DATA};
return &const_nist_521;
return BIGNUM_CONST(&bn_nist_p_521);
}
/* some misc internal functions */