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

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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
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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
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@ -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 */