X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=crypto%2Fbn%2Fbn_lib.c;h=150f4b80deaa00b8330cc5e24fc19b06f10d5da2;hp=479d17ea52f67c24f4b55db9c6a41d5ee71e5c33;hb=8707e3be0c92f05ac3566cc79191b661195fe9f2;hpb=7d7d2cbcb02206f3393681f2bce198e11e2e185b diff --git a/crypto/bn/bn_lib.c b/crypto/bn/bn_lib.c index 479d17ea52..150f4b80de 100644 --- a/crypto/bn/bn_lib.c +++ b/crypto/bn/bn_lib.c @@ -5,21 +5,21 @@ * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. - * + * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). - * + * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. - * + * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: @@ -34,10 +34,10 @@ * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). - * 4. If you include any Windows specific code (or a derivative thereof) from + * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" - * + * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE @@ -49,20 +49,28 @@ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. - * + * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ -#include -#include "cryptlib.h" -#include "bn_lcl.h" +#ifndef BN_DEBUG +# undef NDEBUG /* avoid conflicting definitions */ +# define NDEBUG +#endif -const char *BN_version="Big Number" OPENSSL_VERSION_PTEXT; +#include +#include +#include "internal/cryptlib.h" +#include "bn_lcl.h" +#include -/* For a 32 bit machine +/* This stuff appears to be completely unused, so is deprecated */ +#if OPENSSL_API_COMPAT < 0x00908000L +/*- + * For a 32 bit machine * 2 - 4 == 128 * 3 - 8 == 256 * 4 - 16 == 512 @@ -71,694 +79,934 @@ const char *BN_version="Big Number" OPENSSL_VERSION_PTEXT; * 7 - 128 == 4096 * 8 - 256 == 8192 */ -GLOBAL int bn_limit_bits=0; -GLOBAL int bn_limit_num=8; /* (1<= 0) - { - if (mult > (sizeof(int)*8)-1) - mult=sizeof(int)*8-1; - bn_limit_bits=mult; - bn_limit_num=1<= 0) - { - if (high > (sizeof(int)*8)-1) - high=sizeof(int)*8-1; - bn_limit_bits_high=high; - bn_limit_num_high=1<= 0) - { - if (low > (sizeof(int)*8)-1) - low=sizeof(int)*8-1; - bn_limit_bits_low=low; - bn_limit_num_low=1<= 0) - { - if (mont > (sizeof(int)*8)-1) - mont=sizeof(int)*8-1; - bn_limit_bits_mont=mont; - bn_limit_num_mont=1<= 0) { + if (mult > (int)(sizeof(int) * 8) - 1) + mult = sizeof(int) * 8 - 1; + bn_limit_bits = mult; + bn_limit_num = 1 << mult; + } + if (high >= 0) { + if (high > (int)(sizeof(int) * 8) - 1) + high = sizeof(int) * 8 - 1; + bn_limit_bits_high = high; + bn_limit_num_high = 1 << high; + } + if (low >= 0) { + if (low > (int)(sizeof(int) * 8) - 1) + low = sizeof(int) * 8 - 1; + bn_limit_bits_low = low; + bn_limit_num_low = 1 << low; + } + if (mont >= 0) { + if (mont > (int)(sizeof(int) * 8) - 1) + mont = sizeof(int) * 8 - 1; + bn_limit_bits_mont = mont; + bn_limit_num_mont = 1 << mont; + } +} int BN_get_params(int which) - { - if (which == 0) return(bn_limit_bits); - else if (which == 1) return(bn_limit_bits_high); - else if (which == 2) return(bn_limit_bits_low); - else if (which == 3) return(bn_limit_bits_mont); - else return(0); - } - -BIGNUM *BN_value_one(void) - { - static BN_ULONG data_one=1L; - static BIGNUM const_one={&data_one,1,1,0}; - - return(&const_one); - } - -char *BN_options(void) - { - static int init=0; - static char data[16]; - - if (!init) - { - init++; -#ifdef BN_LLONG - sprintf(data,"bn(%d,%d)",(int)sizeof(BN_ULLONG)*8, - (int)sizeof(BN_ULONG)*8); -#else - sprintf(data,"bn(%d,%d)",(int)sizeof(BN_ULONG)*8, - (int)sizeof(BN_ULONG)*8); +{ + if (which == 0) + return (bn_limit_bits); + else if (which == 1) + return (bn_limit_bits_high); + else if (which == 2) + return (bn_limit_bits_low); + else if (which == 3) + return (bn_limit_bits_mont); + else + return (0); +} #endif - } - return(data); - } + +const BIGNUM *BN_value_one(void) +{ + static const BN_ULONG data_one = 1L; + static const BIGNUM const_one = + { (BN_ULONG *)&data_one, 1, 1, 0, BN_FLG_STATIC_DATA }; + + return (&const_one); +} int BN_num_bits_word(BN_ULONG l) - { - static char bits[256]={ - 0,1,2,2,3,3,3,3,4,4,4,4,4,4,4,4, - 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5, - 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6, - 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6, - 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, - 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, - 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, - 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, - 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, - 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, - 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, - 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, - 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, - 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, - 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, - 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8, - }; +{ + static const unsigned char bits[256] = { + 0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, + 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, + 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, + 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, + 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, + 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, + 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, + 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, + 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, + 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, + 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, + 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, + 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, + 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, + 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, + 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, + }; #if defined(SIXTY_FOUR_BIT_LONG) - if (l & 0xffffffff00000000L) - { - if (l & 0xffff000000000000L) - { - if (l & 0xff00000000000000L) - { - return(bits[(int)(l>>56)]+56); - } - else return(bits[(int)(l>>48)]+48); - } - else - { - if (l & 0x0000ff0000000000L) - { - return(bits[(int)(l>>40)]+40); - } - else return(bits[(int)(l>>32)]+32); - } - } - else + if (l & 0xffffffff00000000L) { + if (l & 0xffff000000000000L) { + if (l & 0xff00000000000000L) { + return (bits[(int)(l >> 56)] + 56); + } else + return (bits[(int)(l >> 48)] + 48); + } else { + if (l & 0x0000ff0000000000L) { + return (bits[(int)(l >> 40)] + 40); + } else + return (bits[(int)(l >> 32)] + 32); + } + } else #else -#ifdef SIXTY_FOUR_BIT - if (l & 0xffffffff00000000LL) - { - if (l & 0xffff000000000000LL) - { - if (l & 0xff00000000000000LL) - { - return(bits[(int)(l>>56)]+56); - } - else return(bits[(int)(l>>48)]+48); - } - else - { - if (l & 0x0000ff0000000000LL) - { - return(bits[(int)(l>>40)]+40); - } - else return(bits[(int)(l>>32)]+32); - } - } - else -#endif +# ifdef SIXTY_FOUR_BIT + if (l & 0xffffffff00000000LL) { + if (l & 0xffff000000000000LL) { + if (l & 0xff00000000000000LL) { + return (bits[(int)(l >> 56)] + 56); + } else + return (bits[(int)(l >> 48)] + 48); + } else { + if (l & 0x0000ff0000000000LL) { + return (bits[(int)(l >> 40)] + 40); + } else + return (bits[(int)(l >> 32)] + 32); + } + } else +# endif #endif - { + { #if defined(THIRTY_TWO_BIT) || defined(SIXTY_FOUR_BIT) || defined(SIXTY_FOUR_BIT_LONG) - if (l & 0xffff0000L) - { - if (l & 0xff000000L) - return(bits[(int)(l>>24L)]+24); - else return(bits[(int)(l>>16L)]+16); - } - else -#endif - { -#if defined(SIXTEEN_BIT) || defined(THIRTY_TWO_BIT) || defined(SIXTY_FOUR_BIT) || defined(SIXTY_FOUR_BIT_LONG) - if (l & 0xff00L) - return(bits[(int)(l>>8)]+8); - else + if (l & 0xffff0000L) { + if (l & 0xff000000L) + return (bits[(int)(l >> 24L)] + 24); + else + return (bits[(int)(l >> 16L)] + 16); + } else #endif - return(bits[(int)(l )] ); - } - } - } - -int BN_num_bits(BIGNUM *a) - { - BN_ULONG l; - int i; - - bn_check_top(a); - - if (a->top == 0) return(0); - l=a->d[a->top-1]; - i=(a->top-1)*BN_BITS2; - if (l == 0) - { -#if !defined(NO_STDIO) && !defined(WIN16) - fprintf(stderr,"BAD TOP VALUE\n"); + { +#if defined(THIRTY_TWO_BIT) || defined(SIXTY_FOUR_BIT) || defined(SIXTY_FOUR_BIT_LONG) + if (l & 0xff00L) + return (bits[(int)(l >> 8)] + 8); + else #endif - abort(); - } - return(i+BN_num_bits_word(l)); - } + return (bits[(int)(l)]); + } + } +} + +int BN_num_bits(const BIGNUM *a) +{ + int i = a->top - 1; + bn_check_top(a); + + if (BN_is_zero(a)) + return 0; + return ((i * BN_BITS2) + BN_num_bits_word(a->d[i])); +} + +static void bn_free_d(BIGNUM *a) +{ + if (BN_get_flags(a,BN_FLG_SECURE)) + OPENSSL_secure_free(a->d); + else + OPENSSL_free(a->d); +} + void BN_clear_free(BIGNUM *a) - { - int i; - - if (a == NULL) return; - if (a->d != NULL) - { - memset(a->d,0,a->max*sizeof(a->d[0])); - if (!(BN_get_flags(a,BN_FLG_STATIC_DATA))) - Free(a->d); - } - i=BN_get_flags(a,BN_FLG_MALLOCED); - memset(a,0,sizeof(BIGNUM)); - if (i) - Free(a); - } +{ + int i; + + if (a == NULL) + return; + bn_check_top(a); + if (a->d != NULL) { + OPENSSL_cleanse(a->d, a->dmax * sizeof(a->d[0])); + if (!BN_get_flags(a, BN_FLG_STATIC_DATA)) + bn_free_d(a); + } + i = BN_get_flags(a, BN_FLG_MALLOCED); + OPENSSL_cleanse(a, sizeof(*a)); + if (i) + OPENSSL_free(a); +} void BN_free(BIGNUM *a) - { - if (a == NULL) return; - if ((a->d != NULL) && !(BN_get_flags(a,BN_FLG_STATIC_DATA))) - Free(a->d); - a->flags|=BN_FLG_FREE; /* REMOVE? */ - if (a->flags & BN_FLG_MALLOCED) - Free(a); - } - -void BN_init(BIGNUM *a) - { - memset(a,0,sizeof(BIGNUM)); - } +{ + if (a == NULL) + return; + bn_check_top(a); + if (!BN_get_flags(a, BN_FLG_STATIC_DATA)) + bn_free_d(a); + if (a->flags & BN_FLG_MALLOCED) + OPENSSL_free(a); + else { +#if OPENSSL_API_COMPAT < 0x00908000L + a->flags |= BN_FLG_FREE; +#endif + a->d = NULL; + } +} + +void bn_init(BIGNUM *a) +{ + static BIGNUM nilbn; + + *a = nilbn; + bn_check_top(a); +} BIGNUM *BN_new(void) - { - BIGNUM *ret; - - if ((ret=(BIGNUM *)Malloc(sizeof(BIGNUM))) == NULL) - { - BNerr(BN_F_BN_NEW,ERR_R_MALLOC_FAILURE); - return(NULL); - } - ret->flags=BN_FLG_MALLOCED; - ret->top=0; - ret->neg=0; - ret->max=0; - ret->d=NULL; - return(ret); - } - - -BN_CTX *BN_CTX_new(void) - { - BN_CTX *ret; - - ret=(BN_CTX *)Malloc(sizeof(BN_CTX)); - if (ret == NULL) - { - BNerr(BN_F_BN_CTX_NEW,ERR_R_MALLOC_FAILURE); - return(NULL); - } - - BN_CTX_init(ret); - ret->flags=BN_FLG_MALLOCED; - return(ret); - } - -void BN_CTX_init(BN_CTX *ctx) - { - memset(ctx,0,sizeof(BN_CTX)); - ctx->tos=0; - ctx->flags=0; - } - -void BN_CTX_free(BN_CTX *c) - { - int i; - - if(c == NULL) - return; - - for (i=0; ibn[i])); - if (c->flags & BN_FLG_MALLOCED) - Free(c); - } +{ + BIGNUM *ret; + + if ((ret = OPENSSL_zalloc(sizeof(*ret))) == NULL) { + BNerr(BN_F_BN_NEW, ERR_R_MALLOC_FAILURE); + return (NULL); + } + ret->flags = BN_FLG_MALLOCED; + bn_check_top(ret); + return (ret); +} + + BIGNUM *BN_secure_new(void) + { + BIGNUM *ret = BN_new(); + if (ret != NULL) + ret->flags |= BN_FLG_SECURE; + return (ret); + } + +/* This is used by bn_expand2() */ +/* The caller MUST check that words > b->dmax before calling this */ +static BN_ULONG *bn_expand_internal(const BIGNUM *b, int words) +{ + BN_ULONG *A, *a = NULL; + const BN_ULONG *B; + int i; + + bn_check_top(b); + + if (words > (INT_MAX / (4 * BN_BITS2))) { + BNerr(BN_F_BN_EXPAND_INTERNAL, BN_R_BIGNUM_TOO_LONG); + return NULL; + } + if (BN_get_flags(b, BN_FLG_STATIC_DATA)) { + BNerr(BN_F_BN_EXPAND_INTERNAL, BN_R_EXPAND_ON_STATIC_BIGNUM_DATA); + return (NULL); + } + if (BN_get_flags(b,BN_FLG_SECURE)) + a = A = OPENSSL_secure_malloc(words * sizeof(*a)); + else + a = A = OPENSSL_malloc(words * sizeof(*a)); + if (A == NULL) { + BNerr(BN_F_BN_EXPAND_INTERNAL, ERR_R_MALLOC_FAILURE); + return (NULL); + } +#ifdef PURIFY + /* + * Valgrind complains in BN_consttime_swap because we process the whole + * array even if it's not initialised yet. This doesn't matter in that + * function - what's important is constant time operation (we're not + * actually going to use the data) + */ + memset(a, 0, sizeof(*a) * words); +#endif -BIGNUM *bn_expand2(BIGNUM *b, int words) - { - BN_ULONG *A,*B,*a; - int i,j; - - bn_check_top(b); - - if (words > b->max) - { - bn_check_top(b); - if (BN_get_flags(b,BN_FLG_STATIC_DATA)) - { - BNerr(BN_F_BN_EXPAND2,BN_R_EXPAND_ON_STATIC_BIGNUM_DATA); - return(NULL); - } - a=A=(BN_ULONG *)Malloc(sizeof(BN_ULONG)*(words+1)); - if (A == NULL) - { - BNerr(BN_F_BN_EXPAND2,ERR_R_MALLOC_FAILURE); - return(NULL); - } -memset(A,0x5c,sizeof(BN_ULONG)*(words+1)); #if 1 - B=b->d; - /* Check if the previous number needs to be copied */ - if (B != NULL) - { - /* This lot is an unrolled loop to copy b->top - * BN_ULONGs from B to A - */ - for (i=b->top&(~7); i>0; i-=8) - { - A[0]=B[0]; A[1]=B[1]; A[2]=B[2]; A[3]=B[3]; - A[4]=B[4]; A[5]=B[5]; A[6]=B[6]; A[7]=B[7]; - A+=8; - B+=8; - } - switch (b->top&7) - { - case 7: - A[6]=B[6]; - case 6: - A[5]=B[5]; - case 5: - A[4]=B[4]; - case 4: - A[3]=B[3]; - case 3: - A[2]=B[2]; - case 2: - A[1]=B[1]; - case 1: - A[0]=B[0]; - case 0: - /* I need the 'case 0' entry for utrix cc. - * If the optimiser is turned on, it does the - * switch table by doing - * a=top&7 - * a--; - * goto jump_table[a]; - * If top is 0, this makes us jump to 0xffffffc - * which is rather bad :-(. - * eric 23-Apr-1998 - */ - ; - } - Free(b->d); - } - - b->d=a; - b->max=words; - - /* Now need to zero any data between b->top and b->max */ - - B= &(b->d[b->top]); - j=(b->max - b->top) & ~7; - for (i=0; imax - b->top) & 7; - for (i=0; id; + /* Check if the previous number needs to be copied */ + if (B != NULL) { + for (i = b->top >> 2; i > 0; i--, A += 4, B += 4) { + /* + * The fact that the loop is unrolled + * 4-wise is a tribute to Intel. It's + * the one that doesn't have enough + * registers to accomodate more data. + * I'd unroll it 8-wise otherwise:-) + * + * + */ + BN_ULONG a0, a1, a2, a3; + a0 = B[0]; + a1 = B[1]; + a2 = B[2]; + a3 = B[3]; + A[0] = a0; + A[1] = a1; + A[2] = a2; + A[3] = a3; + } + /* + * workaround for ultrix cc: without 'case 0', the optimizer does + * the switch table by doing a=top&3; a--; goto jump_table[a]; + * which fails for top== 0 + */ + switch (b->top & 3) { + case 3: + A[2] = B[2]; + case 2: + A[1] = B[1]; + case 1: + A[0] = B[0]; + case 0: + ; + } + } #else - memcpy(a->d,b->d,sizeof(b->d[0])*b->top); + memset(A, 0, sizeof(*A) * words); + memcpy(A, b->d, sizeof(b->d[0]) * b->top); #endif - -/* memset(&(p[b->max]),0,((words+1)-b->max)*sizeof(BN_ULONG)); */ -/* { int i; for (i=b->max; id with leading zeros. It is mostly used by the + * various BIGNUM routines. If there is an error, NULL is returned. If not, + * 'b' is returned. + */ - if (a == b) return(a); - if (bn_wexpand(a,b->top) == NULL) return(NULL); +BIGNUM *bn_expand2(BIGNUM *b, int words) +{ + bn_check_top(b); + + if (words > b->dmax) { + BN_ULONG *a = bn_expand_internal(b, words); + if (!a) + return NULL; + if (b->d) { + OPENSSL_cleanse(b->d, b->dmax * sizeof(b->d[0])); + bn_free_d(b); + } + b->d = a; + b->dmax = words; + } + + bn_check_top(b); + return b; +} + +BIGNUM *BN_dup(const BIGNUM *a) +{ + BIGNUM *t; + + if (a == NULL) + return NULL; + bn_check_top(a); + + t = BN_get_flags(a, BN_FLG_SECURE) ? BN_secure_new() : BN_new(); + if (t == NULL) + return NULL; + if (!BN_copy(t, a)) { + BN_free(t); + return NULL; + } + bn_check_top(t); + return t; +} + +BIGNUM *BN_copy(BIGNUM *a, const BIGNUM *b) +{ + int i; + BN_ULONG *A; + const BN_ULONG *B; + + bn_check_top(b); + + if (a == b) + return (a); + if (bn_wexpand(a, b->top) == NULL) + return (NULL); #if 1 - A=a->d; - B=b->d; - for (i=b->top&(~7); i>0; i-=8) - { - A[0]=B[0]; - A[1]=B[1]; - A[2]=B[2]; - A[3]=B[3]; - A[4]=B[4]; - A[5]=B[5]; - A[6]=B[6]; - A[7]=B[7]; - A+=8; - B+=8; - } - switch (b->top&7) - { - case 7: - A[6]=B[6]; - case 6: - A[5]=B[5]; - case 5: - A[4]=B[4]; - case 4: - A[3]=B[3]; - case 3: - A[2]=B[2]; - case 2: - A[1]=B[1]; - case 1: - A[0]=B[0]; - case 0: - /* I need the 'case 0' entry for utrix cc. - * If the optimiser is turned on, it does the - * switch table by doing - * a=top&7 - * a--; - * goto jump_table[a]; - * If top is 0, this makes us jump to 0xffffffc which is - * rather bad :-(. - * eric 23-Apr-1998 - */ - ; - } + A = a->d; + B = b->d; + for (i = b->top >> 2; i > 0; i--, A += 4, B += 4) { + BN_ULONG a0, a1, a2, a3; + a0 = B[0]; + a1 = B[1]; + a2 = B[2]; + a3 = B[3]; + A[0] = a0; + A[1] = a1; + A[2] = a2; + A[3] = a3; + } + /* ultrix cc workaround, see comments in bn_expand_internal */ + switch (b->top & 3) { + case 3: + A[2] = B[2]; + case 2: + A[1] = B[1]; + case 1: + A[0] = B[0]; + case 0:; + } #else - memcpy(a->d,b->d,sizeof(b->d[0])*b->top); + memcpy(a->d, b->d, sizeof(b->d[0]) * b->top); #endif -/* memset(&(a->d[b->top]),0,sizeof(a->d[0])*(a->max-b->top));*/ - a->top=b->top; - if ((a->top == 0) && (a->d != NULL)) - a->d[0]=0; - a->neg=b->neg; - return(a); - } + a->top = b->top; + a->neg = b->neg; + bn_check_top(a); + return (a); +} + +void BN_swap(BIGNUM *a, BIGNUM *b) +{ + int flags_old_a, flags_old_b; + BN_ULONG *tmp_d; + int tmp_top, tmp_dmax, tmp_neg; + + bn_check_top(a); + bn_check_top(b); + + flags_old_a = a->flags; + flags_old_b = b->flags; + + tmp_d = a->d; + tmp_top = a->top; + tmp_dmax = a->dmax; + tmp_neg = a->neg; + + a->d = b->d; + a->top = b->top; + a->dmax = b->dmax; + a->neg = b->neg; + + b->d = tmp_d; + b->top = tmp_top; + b->dmax = tmp_dmax; + b->neg = tmp_neg; + + a->flags = + (flags_old_a & BN_FLG_MALLOCED) | (flags_old_b & BN_FLG_STATIC_DATA); + b->flags = + (flags_old_b & BN_FLG_MALLOCED) | (flags_old_a & BN_FLG_STATIC_DATA); + bn_check_top(a); + bn_check_top(b); +} void BN_clear(BIGNUM *a) - { - if (a->d != NULL) - memset(a->d,0,a->max*sizeof(a->d[0])); - a->top=0; - a->neg=0; - } - -BN_ULONG BN_get_word(BIGNUM *a) - { - int i,n; - BN_ULONG ret=0; - - n=BN_num_bytes(a); - if (n > sizeof(BN_ULONG)) - return(BN_MASK2); - for (i=a->top-1; i>=0; i--) - { -#ifndef SIXTY_FOUR_BIT /* the data item > unsigned long */ - ret<<=BN_BITS4; /* stops the compiler complaining */ - ret<<=BN_BITS4; -#endif - ret|=a->d[i]; - } - return(ret); - } +{ + bn_check_top(a); + if (a->d != NULL) + memset(a->d, 0, sizeof(*a->d) * a->dmax); + a->top = 0; + a->neg = 0; +} + +BN_ULONG BN_get_word(const BIGNUM *a) +{ + if (a->top > 1) + return BN_MASK2; + else if (a->top == 1) + return a->d[0]; + /* a->top == 0 */ + return 0; +} int BN_set_word(BIGNUM *a, BN_ULONG w) - { - int i,n; - if (bn_expand(a,sizeof(BN_ULONG)*8) == NULL) return(0); - - n=sizeof(BN_ULONG)/BN_BYTES; - a->neg=0; - a->top=0; - a->d[0]=(BN_ULONG)w&BN_MASK2; - if (a->d[0] != 0) a->top=1; - for (i=1; i>=BN_BITS2 so compilers don't complain - * on builds where sizeof(long) == BN_TYPES */ -#ifndef SIXTY_FOUR_BIT /* the data item > unsigned long */ - w>>=BN_BITS4; - w>>=BN_BITS4; -#endif - a->d[i]=(BN_ULONG)w&BN_MASK2; - if (a->d[i] != 0) a->top=i+1; - } - return(1); - } +{ + bn_check_top(a); + if (bn_expand(a, (int)sizeof(BN_ULONG) * 8) == NULL) + return (0); + a->neg = 0; + a->d[0] = w; + a->top = (w ? 1 : 0); + bn_check_top(a); + return (1); +} -/* ignore negative */ BIGNUM *BN_bin2bn(const unsigned char *s, int len, BIGNUM *ret) - { - unsigned int i,m; - unsigned int n; - BN_ULONG l; - - if (ret == NULL) ret=BN_new(); - if (ret == NULL) return(NULL); - l=0; - n=len; - if (n == 0) - { - ret->top=0; - return(ret); - } - if (bn_expand(ret,(int)(n+2)*8) == NULL) - return(NULL); - i=((n-1)/BN_BYTES)+1; - m=((n-1)%(BN_BYTES)); - ret->top=i; - while (n-- > 0) - { - l=(l<<8L)| *(s++); - if (m-- == 0) - { - ret->d[--i]=l; - l=0; - m=BN_BYTES-1; - } - } - /* need to call this due to clear byte at top if avoiding - * having the top bit set (-ve number) */ - bn_fix_top(ret); - return(ret); - } +{ + unsigned int i, m; + unsigned int n; + BN_ULONG l; + BIGNUM *bn = NULL; + + if (ret == NULL) + ret = bn = BN_new(); + if (ret == NULL) + return (NULL); + bn_check_top(ret); + /* Skip leading zero's. */ + for ( ; len > 0 && *s == 0; s++, len--) + continue; + n = len; + if (n == 0) { + ret->top = 0; + return (ret); + } + i = ((n - 1) / BN_BYTES) + 1; + m = ((n - 1) % (BN_BYTES)); + if (bn_wexpand(ret, (int)i) == NULL) { + BN_free(bn); + return NULL; + } + ret->top = i; + ret->neg = 0; + l = 0; + while (n--) { + l = (l << 8L) | *(s++); + if (m-- == 0) { + ret->d[--i] = l; + l = 0; + m = BN_BYTES - 1; + } + } + /* + * need to call this due to clear byte at top if avoiding having the top + * bit set (-ve number) + */ + bn_correct_top(ret); + return (ret); +} /* ignore negative */ -int BN_bn2bin(BIGNUM *a, unsigned char *to) - { - int n,i; - BN_ULONG l; - - n=i=BN_num_bytes(a); - while (i-- > 0) - { - l=a->d[i/BN_BYTES]; - *(to++)=(unsigned char)(l>>(8*(i%BN_BYTES)))&0xff; - } - return(n); - } - -int BN_ucmp(BIGNUM *a, BIGNUM *b) - { - int i; - BN_ULONG t1,t2,*ap,*bp; - - bn_check_top(a); - bn_check_top(b); - - i=a->top-b->top; - if (i != 0) return(i); - ap=a->d; - bp=b->d; - for (i=a->top-1; i>=0; i--) - { - t1= ap[i]; - t2= bp[i]; - if (t1 != t2) - return(t1 > t2?1:-1); - } - return(0); - } - -int BN_cmp(BIGNUM *a, BIGNUM *b) - { - int i; - int gt,lt; - BN_ULONG t1,t2; - - if ((a == NULL) || (b == NULL)) - { - if (a != NULL) - return(-1); - else if (b != NULL) - return(1); - else - return(0); - } - - bn_check_top(a); - bn_check_top(b); - - if (a->neg != b->neg) - { - if (a->neg) - return(-1); - else return(1); - } - if (a->neg == 0) - { gt=1; lt= -1; } - else { gt= -1; lt=1; } - - if (a->top > b->top) return(gt); - if (a->top < b->top) return(lt); - for (i=a->top-1; i>=0; i--) - { - t1=a->d[i]; - t2=b->d[i]; - if (t1 > t2) return(gt); - if (t1 < t2) return(lt); - } - return(0); - } +int BN_bn2bin(const BIGNUM *a, unsigned char *to) +{ + int n, i; + BN_ULONG l; + + bn_check_top(a); + n = i = BN_num_bytes(a); + while (i--) { + l = a->d[i / BN_BYTES]; + *(to++) = (unsigned char)(l >> (8 * (i % BN_BYTES))) & 0xff; + } + return (n); +} + +int BN_ucmp(const BIGNUM *a, const BIGNUM *b) +{ + int i; + BN_ULONG t1, t2, *ap, *bp; + + bn_check_top(a); + bn_check_top(b); + + i = a->top - b->top; + if (i != 0) + return (i); + ap = a->d; + bp = b->d; + for (i = a->top - 1; i >= 0; i--) { + t1 = ap[i]; + t2 = bp[i]; + if (t1 != t2) + return ((t1 > t2) ? 1 : -1); + } + return (0); +} + +int BN_cmp(const BIGNUM *a, const BIGNUM *b) +{ + int i; + int gt, lt; + BN_ULONG t1, t2; + + if ((a == NULL) || (b == NULL)) { + if (a != NULL) + return (-1); + else if (b != NULL) + return (1); + else + return (0); + } + + bn_check_top(a); + bn_check_top(b); + + if (a->neg != b->neg) { + if (a->neg) + return (-1); + else + return (1); + } + if (a->neg == 0) { + gt = 1; + lt = -1; + } else { + gt = -1; + lt = 1; + } + + if (a->top > b->top) + return (gt); + if (a->top < b->top) + return (lt); + for (i = a->top - 1; i >= 0; i--) { + t1 = a->d[i]; + t2 = b->d[i]; + if (t1 > t2) + return (gt); + if (t1 < t2) + return (lt); + } + return (0); +} int BN_set_bit(BIGNUM *a, int n) - { - int i,j,k; - - i=n/BN_BITS2; - j=n%BN_BITS2; - if (a->top <= i) - { - if (bn_wexpand(a,i+1) == NULL) return(0); - for(k=a->top; kd[k]=0; - a->top=i+1; - } - - a->d[i]|=(1L<top <= i) { + if (bn_wexpand(a, i + 1) == NULL) + return (0); + for (k = a->top; k < i + 1; k++) + a->d[k] = 0; + a->top = i + 1; + } + + a->d[i] |= (((BN_ULONG)1) << j); + bn_check_top(a); + return (1); +} int BN_clear_bit(BIGNUM *a, int n) - { - int i,j; - - i=n/BN_BITS2; - j=n%BN_BITS2; - if (a->top <= i) return(0); - - a->d[i]&=(~(1L<top <= i) return(0); - return((a->d[i]&(((BN_ULONG)1)<top <= i) + return (0); + + a->d[i] &= (~(((BN_ULONG)1) << j)); + bn_correct_top(a); + return (1); +} + +int BN_is_bit_set(const BIGNUM *a, int n) +{ + int i, j; + + bn_check_top(a); + if (n < 0) + return 0; + i = n / BN_BITS2; + j = n % BN_BITS2; + if (a->top <= i) + return 0; + return (int)(((a->d[i]) >> j) & ((BN_ULONG)1)); +} int BN_mask_bits(BIGNUM *a, int n) - { - int b,w; - - w=n/BN_BITS2; - b=n%BN_BITS2; - if (w >= a->top) return(0); - if (b == 0) - a->top=w; - else - { - a->top=w+1; - a->d[w]&= ~(BN_MASK2< bb)?1:-1); - for (i=n-2; i>=0; i--) - { - aa=a[i]; - bb=b[i]; - if (aa != bb) return((aa > bb)?1:-1); - } - return(0); - } +{ + int b, w; + + bn_check_top(a); + if (n < 0) + return 0; + + w = n / BN_BITS2; + b = n % BN_BITS2; + if (w >= a->top) + return 0; + if (b == 0) + a->top = w; + else { + a->top = w + 1; + a->d[w] &= ~(BN_MASK2 << b); + } + bn_correct_top(a); + return (1); +} + +void BN_set_negative(BIGNUM *a, int b) +{ + if (b && !BN_is_zero(a)) + a->neg = 1; + else + a->neg = 0; +} + +int bn_cmp_words(const BN_ULONG *a, const BN_ULONG *b, int n) +{ + int i; + BN_ULONG aa, bb; + + aa = a[n - 1]; + bb = b[n - 1]; + if (aa != bb) + return ((aa > bb) ? 1 : -1); + for (i = n - 2; i >= 0; i--) { + aa = a[i]; + bb = b[i]; + if (aa != bb) + return ((aa > bb) ? 1 : -1); + } + return (0); +} + +/* + * Here follows a specialised variants of bn_cmp_words(). It has the + * property of performing the operation on arrays of different sizes. The + * sizes of those arrays is expressed through cl, which is the common length + * ( basicall, min(len(a),len(b)) ), and dl, which is the delta between the + * two lengths, calculated as len(a)-len(b). All lengths are the number of + * BN_ULONGs... + */ +int bn_cmp_part_words(const BN_ULONG *a, const BN_ULONG *b, int cl, int dl) +{ + int n, i; + n = cl - 1; + + if (dl < 0) { + for (i = dl; i < 0; i++) { + if (b[n - i] != 0) + return -1; /* a < b */ + } + } + if (dl > 0) { + for (i = dl; i > 0; i--) { + if (a[n + i] != 0) + return 1; /* a > b */ + } + } + return bn_cmp_words(a, b, cl); +} + +/* + * Constant-time conditional swap of a and b. + * a and b are swapped if condition is not 0. The code assumes that at most one bit of condition is set. + * nwords is the number of words to swap. The code assumes that at least nwords are allocated in both a and b, + * and that no more than nwords are used by either a or b. + * a and b cannot be the same number + */ +void BN_consttime_swap(BN_ULONG condition, BIGNUM *a, BIGNUM *b, int nwords) +{ + BN_ULONG t; + int i; + + bn_wcheck_size(a, nwords); + bn_wcheck_size(b, nwords); + + assert(a != b); + assert((condition & (condition - 1)) == 0); + assert(sizeof(BN_ULONG) >= sizeof(int)); + + condition = ((condition - 1) >> (BN_BITS2 - 1)) - 1; + + t = (a->top ^ b->top) & condition; + a->top ^= t; + b->top ^= t; + +#define BN_CONSTTIME_SWAP(ind) \ + do { \ + t = (a->d[ind] ^ b->d[ind]) & condition; \ + a->d[ind] ^= t; \ + b->d[ind] ^= t; \ + } while (0) + + switch (nwords) { + default: + for (i = 10; i < nwords; i++) + BN_CONSTTIME_SWAP(i); + /* Fallthrough */ + case 10: + BN_CONSTTIME_SWAP(9); /* Fallthrough */ + case 9: + BN_CONSTTIME_SWAP(8); /* Fallthrough */ + case 8: + BN_CONSTTIME_SWAP(7); /* Fallthrough */ + case 7: + BN_CONSTTIME_SWAP(6); /* Fallthrough */ + case 6: + BN_CONSTTIME_SWAP(5); /* Fallthrough */ + case 5: + BN_CONSTTIME_SWAP(4); /* Fallthrough */ + case 4: + BN_CONSTTIME_SWAP(3); /* Fallthrough */ + case 3: + BN_CONSTTIME_SWAP(2); /* Fallthrough */ + case 2: + BN_CONSTTIME_SWAP(1); /* Fallthrough */ + case 1: + BN_CONSTTIME_SWAP(0); + } +#undef BN_CONSTTIME_SWAP +} + +/* Bits of security, see SP800-57 */ + +int BN_security_bits(int L, int N) +{ + int secbits, bits; + if (L >= 15360) + secbits = 256; + else if (L >= 7690) + secbits = 192; + else if (L >= 3072) + secbits = 128; + else if (L >= 2048) + secbits = 112; + else if (L >= 1024) + secbits = 80; + else + return 0; + if (N == -1) + return secbits; + bits = N / 2; + if (bits < 80) + return 0; + return bits >= secbits ? secbits : bits; +} + +void BN_zero_ex(BIGNUM *a) +{ + a->top = 0; + a->neg = 0; +} + +int BN_abs_is_word(const BIGNUM *a, const BN_ULONG w) +{ + return ((a->top == 1) && (a->d[0] == w)) || ((w == 0) && (a->top == 0)); +} + +int BN_is_zero(const BIGNUM *a) +{ + return a->top == 0; +} + +int BN_is_one(const BIGNUM *a) +{ + return BN_abs_is_word(a, 1) && !a->neg; +} + +int BN_is_word(const BIGNUM *a, const BN_ULONG w) +{ + return BN_abs_is_word(a, w) && (!w || !a->neg); +} + +int BN_is_odd(const BIGNUM *a) +{ + return (a->top > 0) && (a->d[0] & 1); +} + +int BN_is_negative(const BIGNUM *a) +{ + return (a->neg != 0); +} + +int BN_to_montgomery(BIGNUM *r, const BIGNUM *a, BN_MONT_CTX *mont, + BN_CTX *ctx) +{ + return BN_mod_mul_montgomery(r, a, &(mont->RR), mont, ctx); +} + +void BN_with_flags(BIGNUM *dest, const BIGNUM *b, int flags) +{ + dest->d = b->d; + dest->top = b->top; + dest->dmax = b->dmax; + dest->neg = b->neg; + dest->flags = ((dest->flags & BN_FLG_MALLOCED) + | (b->flags & ~BN_FLG_MALLOCED) + | BN_FLG_STATIC_DATA | flags); +} + +BN_GENCB *BN_GENCB_new(void) +{ + BN_GENCB *ret; + + if ((ret = OPENSSL_malloc(sizeof(*ret))) == NULL) { + BNerr(BN_F_BN_GENCB_NEW, ERR_R_MALLOC_FAILURE); + return (NULL); + } + + return ret; +} + +void BN_GENCB_free(BN_GENCB *cb) +{ + if (cb == NULL) + return; + OPENSSL_free(cb); +} + +void BN_set_flags(BIGNUM *b, int n) +{ + b->flags |= n; +} + +int BN_get_flags(const BIGNUM *b, int n) +{ + return b->flags & n; +} + +/* Populate a BN_GENCB structure with an "old"-style callback */ +void BN_GENCB_set_old(BN_GENCB *gencb, void (*callback) (int, int, void *), + void *cb_arg) +{ + BN_GENCB *tmp_gencb = gencb; + tmp_gencb->ver = 1; + tmp_gencb->arg = cb_arg; + tmp_gencb->cb.cb_1 = callback; +} + +/* Populate a BN_GENCB structure with a "new"-style callback */ +void BN_GENCB_set(BN_GENCB *gencb, int (*callback) (int, int, BN_GENCB *), + void *cb_arg) +{ + BN_GENCB *tmp_gencb = gencb; + tmp_gencb->ver = 2; + tmp_gencb->arg = cb_arg; + tmp_gencb->cb.cb_2 = callback; +} + +void *BN_GENCB_get_arg(BN_GENCB *cb) +{ + return cb->arg; +} + +BIGNUM *bn_wexpand(BIGNUM *a, int words) +{ + return (words <= a->dmax) ? a : bn_expand2(a, words); +} + +void bn_correct_top(BIGNUM *a) +{ + BN_ULONG *ftl; + int tmp_top = a->top; + + if (tmp_top > 0) { + for (ftl = &(a->d[tmp_top - 1]); tmp_top > 0; tmp_top--) + if (*(ftl--)) + break; + a->top = tmp_top; + } + bn_pollute(a); +}