Mercurial > dropbear
view libtomcrypt/src/math/gmp_desc.c @ 1523:1d163552145f coverity
merge coverity
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Mon, 19 Feb 2018 23:14:49 +0800 |
parents | 6dba84798cd5 |
children |
line wrap: on
line source
/* LibTomCrypt, modular cryptographic library -- Tom St Denis * * LibTomCrypt is a library that provides various cryptographic * algorithms in a highly modular and flexible manner. * * The library is free for all purposes without any express * guarantee it works. */ #define DESC_DEF_ONLY #include "tomcrypt.h" #ifdef GMP_DESC #include <stdio.h> #include <gmp.h> static int init(void **a) { LTC_ARGCHK(a != NULL); *a = XCALLOC(1, sizeof(__mpz_struct)); if (*a == NULL) { return CRYPT_MEM; } mpz_init(((__mpz_struct *)*a)); return CRYPT_OK; } static void deinit(void *a) { LTC_ARGCHKVD(a != NULL); mpz_clear(a); XFREE(a); } static int neg(void *a, void *b) { LTC_ARGCHK(a != NULL); LTC_ARGCHK(b != NULL); mpz_neg(b, a); return CRYPT_OK; } static int copy(void *a, void *b) { LTC_ARGCHK(a != NULL); LTC_ARGCHK(b != NULL); mpz_set(b, a); return CRYPT_OK; } static int init_copy(void **a, void *b) { if (init(a) != CRYPT_OK) { return CRYPT_MEM; } return copy(b, *a); } /* ---- trivial ---- */ static int set_int(void *a, ltc_mp_digit b) { LTC_ARGCHK(a != NULL); mpz_set_ui(((__mpz_struct *)a), b); return CRYPT_OK; } static unsigned long get_int(void *a) { LTC_ARGCHK(a != NULL); return mpz_get_ui(a); } static ltc_mp_digit get_digit(void *a, int n) { LTC_ARGCHK(a != NULL); return mpz_getlimbn(a, n); } static int get_digit_count(void *a) { LTC_ARGCHK(a != NULL); return mpz_size(a); } static int compare(void *a, void *b) { int ret; LTC_ARGCHK(a != NULL); LTC_ARGCHK(b != NULL); ret = mpz_cmp(a, b); if (ret < 0) { return LTC_MP_LT; } else if (ret > 0) { return LTC_MP_GT; } else { return LTC_MP_EQ; } } static int compare_d(void *a, ltc_mp_digit b) { int ret; LTC_ARGCHK(a != NULL); ret = mpz_cmp_ui(((__mpz_struct *)a), b); if (ret < 0) { return LTC_MP_LT; } else if (ret > 0) { return LTC_MP_GT; } else { return LTC_MP_EQ; } } static int count_bits(void *a) { LTC_ARGCHK(a != NULL); return mpz_sizeinbase(a, 2); } static int count_lsb_bits(void *a) { LTC_ARGCHK(a != NULL); return mpz_scan1(a, 0); } static int twoexpt(void *a, int n) { LTC_ARGCHK(a != NULL); mpz_set_ui(a, 0); mpz_setbit(a, n); return CRYPT_OK; } /* ---- conversions ---- */ static const char rmap[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz+/"; /* read ascii string */ static int read_radix(void *a, const char *b, int radix) { int ret; LTC_ARGCHK(a != NULL); LTC_ARGCHK(b != NULL); if (radix == 64) { /* Sadly, GMP only supports radixes up to 62, but we need 64. * So, although this is not the most elegant or efficient way, * let's just convert the base 64 string (6 bits per digit) to * an octal string (3 bits per digit) that's twice as long. */ char c, *tmp, *q; const char *p; int i; tmp = XMALLOC (1 + 2 * strlen (b)); if (tmp == NULL) { return CRYPT_MEM; } p = b; q = tmp; while ((c = *p++) != 0) { for (i = 0; i < 64; i++) { if (c == rmap[i]) break; } if (i == 64) { XFREE (tmp); /* printf ("c = '%c'\n", c); */ return CRYPT_ERROR; } *q++ = '0' + (i / 8); *q++ = '0' + (i % 8); } *q = 0; ret = mpz_set_str(a, tmp, 8); /* printf ("ret = %d for '%s'\n", ret, tmp); */ XFREE (tmp); } else { ret = mpz_set_str(a, b, radix); } return (ret == 0 ? CRYPT_OK : CRYPT_ERROR); } /* write one */ static int write_radix(void *a, char *b, int radix) { LTC_ARGCHK(a != NULL); LTC_ARGCHK(b != NULL); if (radix >= 11 && radix <= 36) /* If radix is positive, GMP uses lowercase, and if negative, uppercase. * We want it to use uppercase, to match the test vectors (presumably * generated with LibTomMath). */ radix = -radix; mpz_get_str(b, radix, a); return CRYPT_OK; } /* get size as unsigned char string */ static unsigned long unsigned_size(void *a) { unsigned long t; LTC_ARGCHK(a != NULL); t = mpz_sizeinbase(a, 2); if (mpz_cmp_ui(((__mpz_struct *)a), 0) == 0) return 0; return (t>>3) + ((t&7)?1:0); } /* store */ static int unsigned_write(void *a, unsigned char *b) { LTC_ARGCHK(a != NULL); LTC_ARGCHK(b != NULL); mpz_export(b, NULL, 1, 1, 1, 0, ((__mpz_struct*)a)); return CRYPT_OK; } /* read */ static int unsigned_read(void *a, unsigned char *b, unsigned long len) { LTC_ARGCHK(a != NULL); LTC_ARGCHK(b != NULL); mpz_import(a, len, 1, 1, 1, 0, b); return CRYPT_OK; } /* add */ static int add(void *a, void *b, void *c) { LTC_ARGCHK(a != NULL); LTC_ARGCHK(b != NULL); LTC_ARGCHK(c != NULL); mpz_add(c, a, b); return CRYPT_OK; } static int addi(void *a, ltc_mp_digit b, void *c) { LTC_ARGCHK(a != NULL); LTC_ARGCHK(c != NULL); mpz_add_ui(c, a, b); return CRYPT_OK; } /* sub */ static int sub(void *a, void *b, void *c) { LTC_ARGCHK(a != NULL); LTC_ARGCHK(b != NULL); LTC_ARGCHK(c != NULL); mpz_sub(c, a, b); return CRYPT_OK; } static int subi(void *a, ltc_mp_digit b, void *c) { LTC_ARGCHK(a != NULL); LTC_ARGCHK(c != NULL); mpz_sub_ui(c, a, b); return CRYPT_OK; } /* mul */ static int mul(void *a, void *b, void *c) { LTC_ARGCHK(a != NULL); LTC_ARGCHK(b != NULL); LTC_ARGCHK(c != NULL); mpz_mul(c, a, b); return CRYPT_OK; } static int muli(void *a, ltc_mp_digit b, void *c) { LTC_ARGCHK(a != NULL); LTC_ARGCHK(c != NULL); mpz_mul_ui(c, a, b); return CRYPT_OK; } /* sqr */ static int sqr(void *a, void *b) { LTC_ARGCHK(a != NULL); LTC_ARGCHK(b != NULL); mpz_mul(b, a, a); return CRYPT_OK; } /* div */ static int divide(void *a, void *b, void *c, void *d) { mpz_t tmp; LTC_ARGCHK(a != NULL); LTC_ARGCHK(b != NULL); if (c != NULL) { mpz_init(tmp); mpz_divexact(tmp, a, b); } if (d != NULL) { mpz_mod(d, a, b); } if (c != NULL) { mpz_set(c, tmp); mpz_clear(tmp); } return CRYPT_OK; } static int div_2(void *a, void *b) { LTC_ARGCHK(a != NULL); LTC_ARGCHK(b != NULL); mpz_divexact_ui(b, a, 2); return CRYPT_OK; } /* modi */ static int modi(void *a, ltc_mp_digit b, ltc_mp_digit *c) { LTC_ARGCHK(a != NULL); LTC_ARGCHK(c != NULL); *c = mpz_fdiv_ui(a, b); return CRYPT_OK; } /* gcd */ static int gcd(void *a, void *b, void *c) { LTC_ARGCHK(a != NULL); LTC_ARGCHK(b != NULL); LTC_ARGCHK(c != NULL); mpz_gcd(c, a, b); return CRYPT_OK; } /* lcm */ static int lcm(void *a, void *b, void *c) { LTC_ARGCHK(a != NULL); LTC_ARGCHK(b != NULL); LTC_ARGCHK(c != NULL); mpz_lcm(c, a, b); return CRYPT_OK; } static int addmod(void *a, void *b, void *c, void *d) { LTC_ARGCHK(a != NULL); LTC_ARGCHK(b != NULL); LTC_ARGCHK(c != NULL); LTC_ARGCHK(d != NULL); mpz_add(d, a, b); mpz_mod(d, d, c); return CRYPT_OK; } static int submod(void *a, void *b, void *c, void *d) { LTC_ARGCHK(a != NULL); LTC_ARGCHK(b != NULL); LTC_ARGCHK(c != NULL); LTC_ARGCHK(d != NULL); mpz_sub(d, a, b); mpz_mod(d, d, c); return CRYPT_OK; } static int mulmod(void *a, void *b, void *c, void *d) { LTC_ARGCHK(a != NULL); LTC_ARGCHK(b != NULL); LTC_ARGCHK(c != NULL); LTC_ARGCHK(d != NULL); mpz_mul(d, a, b); mpz_mod(d, d, c); return CRYPT_OK; } static int sqrmod(void *a, void *b, void *c) { LTC_ARGCHK(a != NULL); LTC_ARGCHK(b != NULL); LTC_ARGCHK(c != NULL); mpz_mul(c, a, a); mpz_mod(c, c, b); return CRYPT_OK; } /* invmod */ static int invmod(void *a, void *b, void *c) { LTC_ARGCHK(a != NULL); LTC_ARGCHK(b != NULL); LTC_ARGCHK(c != NULL); mpz_invert(c, a, b); return CRYPT_OK; } /* setup */ static int montgomery_setup(void *a, void **b) { LTC_ARGCHK(a != NULL); LTC_ARGCHK(b != NULL); *b = (void *)1; return CRYPT_OK; } /* get normalization value */ static int montgomery_normalization(void *a, void *b) { LTC_ARGCHK(a != NULL); LTC_ARGCHK(b != NULL); mpz_set_ui(a, 1); return CRYPT_OK; } /* reduce */ static int montgomery_reduce(void *a, void *b, void *c) { LTC_ARGCHK(a != NULL); LTC_ARGCHK(b != NULL); LTC_ARGCHK(c != NULL); mpz_mod(a, a, b); return CRYPT_OK; } /* clean up */ static void montgomery_deinit(void *a) { LTC_UNUSED_PARAM(a); } static int exptmod(void *a, void *b, void *c, void *d) { LTC_ARGCHK(a != NULL); LTC_ARGCHK(b != NULL); LTC_ARGCHK(c != NULL); LTC_ARGCHK(d != NULL); mpz_powm(d, a, b, c); return CRYPT_OK; } static int isprime(void *a, int b, int *c) { LTC_ARGCHK(a != NULL); LTC_ARGCHK(c != NULL); if (b == 0) { b = LTC_MILLER_RABIN_REPS; } /* if */ *c = mpz_probab_prime_p(a, b) > 0 ? LTC_MP_YES : LTC_MP_NO; return CRYPT_OK; } static int set_rand(void *a, int size) { LTC_ARGCHK(a != NULL); mpz_random(a, size); return CRYPT_OK; } const ltc_math_descriptor gmp_desc = { "GNU MP", sizeof(mp_limb_t) * CHAR_BIT - GMP_NAIL_BITS, &init, &init_copy, &deinit, &neg, ©, &set_int, &get_int, &get_digit, &get_digit_count, &compare, &compare_d, &count_bits, &count_lsb_bits, &twoexpt, &read_radix, &write_radix, &unsigned_size, &unsigned_write, &unsigned_read, &add, &addi, &sub, &subi, &mul, &muli, &sqr, ÷, &div_2, &modi, &gcd, &lcm, &mulmod, &sqrmod, &invmod, &montgomery_setup, &montgomery_normalization, &montgomery_reduce, &montgomery_deinit, &exptmod, &isprime, #ifdef LTC_MECC #ifdef LTC_MECC_FP <c_ecc_fp_mulmod, #else <c_ecc_mulmod, #endif /* LTC_MECC_FP */ <c_ecc_projective_add_point, <c_ecc_projective_dbl_point, <c_ecc_map, #ifdef LTC_ECC_SHAMIR #ifdef LTC_MECC_FP <c_ecc_fp_mul2add, #else <c_ecc_mul2add, #endif /* LTC_MECC_FP */ #else NULL, #endif /* LTC_ECC_SHAMIR */ #else NULL, NULL, NULL, NULL, NULL, #endif /* LTC_MECC */ #ifdef LTC_MRSA &rsa_make_key, &rsa_exptmod, #else NULL, NULL, #endif &addmod, &submod, &set_rand, }; #endif /* ref: $Format:%D$ */ /* git commit: $Format:%H$ */ /* commit time: $Format:%ai$ */