Convert the field/group/ecdsa constant initialization to static consts

src/bench_inv.c

@@ -42,11 +42,7 @@ void bench_inv(void* arg) {
 }
 
 int main(void) {
-    secp256k1_ge_start();
-
     bench_inv_t data;
     run_benchmark(bench_inv, bench_inv_setup, NULL, &data, 10, 20000);
-
-    secp256k1_ge_stop();
     return 0;
 }

src/ecdsa_impl.h

@@ -15,43 +15,14 @@
 #include "ecmult_gen.h"
 #include "ecdsa.h"
 
-typedef struct {
-    secp256k1_fe_t order_as_fe;
-    secp256k1_fe_t p_minus_order;
-} secp256k1_ecdsa_consts_t;
+static const secp256k1_fe_t secp256k1_ecdsa_const_order_as_fe = SECP256K1_FE_CONST(
+    0xFFFFFFFFUL, 0xFFFFFFFFUL, 0xFFFFFFFFUL, 0xFFFFFFFEUL,
+    0xBAAEDCE6UL, 0xAF48A03BUL, 0xBFD25E8CUL, 0xD0364141UL
+);
 
-static const secp256k1_ecdsa_consts_t *secp256k1_ecdsa_consts = NULL;
-
-static void secp256k1_ecdsa_start(void) {
-    if (secp256k1_ecdsa_consts != NULL)
-        return;
-
-    /* Allocate. */
-    secp256k1_ecdsa_consts_t *ret = (secp256k1_ecdsa_consts_t*)checked_malloc(sizeof(secp256k1_ecdsa_consts_t));
-
-    static const unsigned char order[] = {
-        0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
-        0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFE,
-        0xBA,0xAE,0xDC,0xE6,0xAF,0x48,0xA0,0x3B,
-        0xBF,0xD2,0x5E,0x8C,0xD0,0x36,0x41,0x41
-    };
-
-    secp256k1_fe_set_b32(&ret->order_as_fe, order);
-    secp256k1_fe_negate(&ret->p_minus_order, &ret->order_as_fe, 1);
-    secp256k1_fe_normalize_var(&ret->p_minus_order);
-
-    /* Set the global pointer. */
-    secp256k1_ecdsa_consts = ret;
-}
-
-static void secp256k1_ecdsa_stop(void) {
-    if (secp256k1_ecdsa_consts == NULL)
-        return;
-
-    secp256k1_ecdsa_consts_t *c = (secp256k1_ecdsa_consts_t*)secp256k1_ecdsa_consts;
-    secp256k1_ecdsa_consts = NULL;
-    free(c);
-}
+static const secp256k1_fe_t secp256k1_ecdsa_const_p_minus_order = SECP256K1_FE_CONST(
+    0, 0, 0, 1, 0x45512319UL, 0x50B75FC4UL, 0x402DA172UL, 0x2FC9BAEEUL
+);
 
 static int secp256k1_ecdsa_sig_parse(secp256k1_ecdsa_sig_t *r, const unsigned char *sig, int size) {
     if (sig[0] != 0x30) return 0;
@@ -146,11 +117,11 @@ static int secp256k1_ecdsa_sig_verify(const secp256k1_ecdsa_sig_t *sig, const se
         // xr.x == xr * xr.z^2 mod p, so the signature is valid.
         return 1;
     }
-    if (secp256k1_fe_cmp_var(&xr, &secp256k1_ecdsa_consts->p_minus_order) >= 0) {
+    if (secp256k1_fe_cmp_var(&xr, &secp256k1_ecdsa_const_p_minus_order) >= 0) {
         // xr + p >= n, so we can skip testing the second case.
         return 0;
     }
-    secp256k1_fe_add(&xr, &secp256k1_ecdsa_consts->order_as_fe);
+    secp256k1_fe_add(&xr, &secp256k1_ecdsa_const_order_as_fe);
     if (secp256k1_gej_eq_x_var(&xr, &pr)) {
         // (xr + n) * pr.z^2 mod p == pr.x, so the signature is valid.
         return 1;
@@ -167,9 +138,9 @@ static int secp256k1_ecdsa_sig_recover(const secp256k1_ecdsa_sig_t *sig, secp256
     secp256k1_fe_t fx;
     VERIFY_CHECK(secp256k1_fe_set_b32(&fx, brx)); /* brx comes from a scalar, so is less than the order; certainly less than p */
     if (recid & 2) {
-        if (secp256k1_fe_cmp_var(&fx, &secp256k1_ecdsa_consts->p_minus_order) >= 0)
+        if (secp256k1_fe_cmp_var(&fx, &secp256k1_ecdsa_const_p_minus_order) >= 0)
             return 0;
-        secp256k1_fe_add(&fx, &secp256k1_ecdsa_consts->order_as_fe);
+        secp256k1_fe_add(&fx, &secp256k1_ecdsa_const_order_as_fe);
     }
     secp256k1_ge_t x;
     if (!secp256k1_ge_set_xo_var(&x, &fx, recid & 1))

src/ecmult_gen_impl.h

@@ -37,8 +37,7 @@ static void secp256k1_ecmult_gen_start(void) {
     secp256k1_ecmult_gen_consts_t *ret = (secp256k1_ecmult_gen_consts_t*)checked_malloc(sizeof(secp256k1_ecmult_gen_consts_t));
 
     /* get the generator */
-    const secp256k1_ge_t *g = &secp256k1_ge_consts->g;
-    secp256k1_gej_t gj; secp256k1_gej_set_ge(&gj, g);
+    secp256k1_gej_t gj; secp256k1_gej_set_ge(&gj, &secp256k1_ge_const_g);
 
     /* Construct a group element with no known corresponding scalar (nothing up my sleeve). */
     secp256k1_gej_t nums_gej;
@@ -50,7 +49,7 @@ static void secp256k1_ecmult_gen_start(void) {
         VERIFY_CHECK(secp256k1_ge_set_xo_var(&nums_ge, &nums_x, 0));
         secp256k1_gej_set_ge(&nums_gej, &nums_ge);
         /* Add G to make the bits in x uniformly distributed. */
-        secp256k1_gej_add_ge_var(&nums_gej, &nums_gej, g);
+        secp256k1_gej_add_ge_var(&nums_gej, &nums_gej, &secp256k1_ge_const_g);
     }
 
     /* compute prec. */

src/ecmult_impl.h

@@ -91,8 +91,7 @@ static void secp256k1_ecmult_start(void) {
     secp256k1_ecmult_consts_t *ret = (secp256k1_ecmult_consts_t*)checked_malloc(sizeof(secp256k1_ecmult_consts_t));
 
     /* get the generator */
-    const secp256k1_ge_t *g = &secp256k1_ge_consts->g;
-    secp256k1_gej_t gj; secp256k1_gej_set_ge(&gj, g);
+    secp256k1_gej_t gj; secp256k1_gej_set_ge(&gj, &secp256k1_ge_const_g);
 
 #ifdef USE_ENDOMORPHISM
     /* calculate 2^128*generator */

src/field.h

@@ -30,21 +30,6 @@
 #error "Please select field implementation"
 #endif
 
-typedef struct {
-#ifndef USE_NUM_NONE
-    secp256k1_num_t p;
-#endif
-    secp256k1_fe_t order;
-} secp256k1_fe_consts_t;
-
-static const secp256k1_fe_consts_t *secp256k1_fe_consts = NULL;
-
-/** Initialize field element precomputation data. */
-static void secp256k1_fe_start(void);
-
-/** Unload field element precomputation data. */
-static void secp256k1_fe_stop(void);
-
 /** Normalize a field element. */
 static void secp256k1_fe_normalize(secp256k1_fe_t *r);
 

src/field_10x26.h

@@ -18,4 +18,23 @@ typedef struct {
 #endif
 } secp256k1_fe_t;
 
+#define SECP256K1_FE_CONST_INNER(d7, d6, d5, d4, d3, d2, d1, d0) { \
+    (d0) & 0x3FFFFFFUL, \
+    ((d0) >> 26) | ((d1) & 0xFFFFFUL) << 6, \
+    ((d1) >> 20) | ((d2) & 0x3FFFUL) << 12, \
+    ((d2) >> 14) | ((d3) & 0xFFUL) << 18, \
+    ((d3) >> 8) | ((d4) & 0x3) << 24, \
+    ((d4) >> 2) & 0x3FFFFFFUL, \
+    ((d4) >> 28) | ((d5) & 0x3FFFFFUL) << 4, \
+    ((d5) >> 22) | ((d6) & 0xFFFF) << 10, \
+    ((d6) >> 16) | ((d7) & 0x3FF) << 16, \
+    ((d7) >> 10) \
+}
+
+#ifdef VERIFY
+#define SECP256K1_FE_CONST(d7, d6, d5, d4, d3, d2, d1, d0) {SECP256K1_FE_CONST_INNER((d7), (d6), (d5), (d4), (d3), (d2), (d1), (d0)), 1, 1}
+#else
+#define SECP256K1_FE_CONST(d7, d6, d5, d4, d3, d2, d1, d0) {SECP256K1_FE_CONST_INNER((d7), (d6), (d5), (d4), (d3), (d2), (d1), (d0))}
+#endif
+
 #endif

src/field_5x52.h

@@ -18,4 +18,18 @@ typedef struct {
 #endif
 } secp256k1_fe_t;
 
+#define SECP256K1_FE_CONST_INNER(d7, d6, d5, d4, d3, d2, d1, d0) { \
+    (d0) | ((uint64_t)(d1) & 0xFFFFFUL) << 32, \
+    ((d1) >> 20) | ((uint64_t)(d2)) << 12 | ((uint64_t)(d3) & 0xFFUL) << 44, \
+    ((d3) >> 8) | ((uint64_t)(d4) & 0xFFFFFFFUL) << 24, \
+    ((d4) >> 28) | ((uint64_t)(d5)) << 4 | ((uint64_t)(d6) & 0xFFFFUL) << 36, \
+    ((d6) >> 16) | ((uint64_t)(d7)) << 16 \
+}
+
+#ifdef VERIFY
+#define SECP256K1_FE_CONST(d7, d6, d5, d4, d3, d2, d1, d0) {SECP256K1_FE_CONST_INNER((d7), (d6), (d5), (d4), (d3), (d2), (d1), (d0)), 1, 1}
+#else
+#define SECP256K1_FE_CONST(d7, d6, d5, d4, d3, d2, d1, d0) {SECP256K1_FE_CONST_INNER((d7), (d6), (d5), (d4), (d3), (d2), (d1), (d0))}
+#endif
+
 #endif

src/field_impl.h

@@ -206,13 +206,20 @@ static void secp256k1_fe_inv_var(secp256k1_fe_t *r, const secp256k1_fe_t *a) {
 #if defined(USE_FIELD_INV_BUILTIN)
     secp256k1_fe_inv(r, a);
 #elif defined(USE_FIELD_INV_NUM)
+    static const unsigned char prime[32] = {
+        0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
+        0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
+        0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
+        0xFF,0xFF,0xFF,0xFE,0xFF,0xFF,0xFC,0x2F
+    };
     unsigned char b[32];
     secp256k1_fe_t c = *a;
     secp256k1_fe_normalize_var(&c);
     secp256k1_fe_get_b32(b, &c);
-    secp256k1_num_t n;
+    secp256k1_num_t n, m;
     secp256k1_num_set_bin(&n, b, 32);
-    secp256k1_num_mod_inverse(&n, &n, &secp256k1_fe_consts->p);
+    secp256k1_num_set_bin(&m, prime, 32);
+    secp256k1_num_mod_inverse(&n, &n, &m);
     secp256k1_num_get_bin(b, 32, &n);
     VERIFY_CHECK(secp256k1_fe_set_b32(r, b));
 #else
@@ -244,32 +251,4 @@ static void secp256k1_fe_inv_all_var(size_t len, secp256k1_fe_t r[len], const se
     r[0] = u;
 }
 
-static void secp256k1_fe_start(void) {
-#ifndef USE_NUM_NONE
-    static const unsigned char secp256k1_fe_consts_p[] = {
-        0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
-        0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
-        0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
-        0xFF,0xFF,0xFF,0xFE,0xFF,0xFF,0xFC,0x2F
-    };
-#endif
-    if (secp256k1_fe_consts == NULL) {
-        secp256k1_fe_inner_start();
-        secp256k1_fe_consts_t *ret = (secp256k1_fe_consts_t*)checked_malloc(sizeof(secp256k1_fe_consts_t));
-#ifndef USE_NUM_NONE
-        secp256k1_num_set_bin(&ret->p, secp256k1_fe_consts_p, sizeof(secp256k1_fe_consts_p));
-#endif
-        secp256k1_fe_consts = ret;
-    }
-}
-
-static void secp256k1_fe_stop(void) {
-    if (secp256k1_fe_consts != NULL) {
-        secp256k1_fe_consts_t *c = (secp256k1_fe_consts_t*)secp256k1_fe_consts;
-        free((void*)c);
-        secp256k1_fe_consts = NULL;
-        secp256k1_fe_inner_stop();
-    }
-}
-
 #endif

src/group.h

@@ -25,24 +25,6 @@ typedef struct {
     int infinity; /* whether this represents the point at infinity */
 } secp256k1_gej_t;
 
-/** Global constants related to the group */
-typedef struct {
-    secp256k1_ge_t g; /* the generator point */
-
-#ifdef USE_ENDOMORPHISM
-    /* constants related to secp256k1's efficiently computable endomorphism */
-    secp256k1_fe_t beta;
-#endif
-} secp256k1_ge_consts_t;
-
-static const secp256k1_ge_consts_t *secp256k1_ge_consts = NULL;
-
-/** Initialize the group module. */
-static void secp256k1_ge_start(void);
-
-/** De-initialize the group module. */
-static void secp256k1_ge_stop(void);
-
 /** Set a group element equal to the point at infinity */
 static void secp256k1_ge_set_infinity(secp256k1_ge_t *r);
 

src/group_impl.h

@@ -13,6 +13,18 @@
 #include "field.h"
 #include "group.h"
 
+static const secp256k1_ge_t secp256k1_ge_const_g = {
+    SECP256K1_FE_CONST(
+        0x79BE667EUL, 0xF9DCBBACUL, 0x55A06295UL, 0xCE870B07UL,
+        0x029BFCDBUL, 0x2DCE28D9UL, 0x59F2815BUL, 0x16F81798UL
+    ),
+    SECP256K1_FE_CONST(
+        0x483ADA77UL, 0x26A3C465UL, 0x5DA4FBFCUL, 0x0E1108A8UL,
+        0xFD17B448UL, 0xA6855419UL, 0x9C47D08FUL, 0xFB10D4B8UL
+    ),
+    0
+};
+
 static void secp256k1_ge_set_infinity(secp256k1_ge_t *r) {
     r->infinity = 1;
 }
@@ -396,53 +408,13 @@ static void secp256k1_gej_get_hex(char *r, int *rlen, const secp256k1_gej_t *a)
 
 #ifdef USE_ENDOMORPHISM
 static void secp256k1_gej_mul_lambda(secp256k1_gej_t *r, const secp256k1_gej_t *a) {
-    const secp256k1_fe_t *beta = &secp256k1_ge_consts->beta;
+    static const secp256k1_fe_t beta = SECP256K1_FE_CONST(
+        0x7ae96a2bul, 0x657c0710ul, 0x6e64479eul, 0xac3434e9ul,
+        0x9cf04975ul, 0x12f58995ul, 0xc1396c28ul, 0x719501eeul
+    );
     *r = *a;
-    secp256k1_fe_mul(&r->x, &r->x, beta);
+    secp256k1_fe_mul(&r->x, &r->x, &beta);
 }
 #endif
 
-static void secp256k1_ge_start(void) {
-    static const unsigned char secp256k1_ge_consts_g_x[] = {
-        0x79,0xBE,0x66,0x7E,0xF9,0xDC,0xBB,0xAC,
-        0x55,0xA0,0x62,0x95,0xCE,0x87,0x0B,0x07,
-        0x02,0x9B,0xFC,0xDB,0x2D,0xCE,0x28,0xD9,
-        0x59,0xF2,0x81,0x5B,0x16,0xF8,0x17,0x98
-    };
-    static const unsigned char secp256k1_ge_consts_g_y[] = {
-        0x48,0x3A,0xDA,0x77,0x26,0xA3,0xC4,0x65,
-        0x5D,0xA4,0xFB,0xFC,0x0E,0x11,0x08,0xA8,
-        0xFD,0x17,0xB4,0x48,0xA6,0x85,0x54,0x19,
-        0x9C,0x47,0xD0,0x8F,0xFB,0x10,0xD4,0xB8
-    };
-#ifdef USE_ENDOMORPHISM
-    /* properties of secp256k1's efficiently computable endomorphism */
-    static const unsigned char secp256k1_ge_consts_beta[] = {
-        0x7a,0xe9,0x6a,0x2b,0x65,0x7c,0x07,0x10,
-        0x6e,0x64,0x47,0x9e,0xac,0x34,0x34,0xe9,
-        0x9c,0xf0,0x49,0x75,0x12,0xf5,0x89,0x95,
-        0xc1,0x39,0x6c,0x28,0x71,0x95,0x01,0xee
-    };
-#endif
-    if (secp256k1_ge_consts == NULL) {
-        secp256k1_ge_consts_t *ret = (secp256k1_ge_consts_t*)checked_malloc(sizeof(secp256k1_ge_consts_t));
-#ifdef USE_ENDOMORPHISM
-        VERIFY_CHECK(secp256k1_fe_set_b32(&ret->beta, secp256k1_ge_consts_beta));
-#endif
-        secp256k1_fe_t g_x, g_y;
-        VERIFY_CHECK(secp256k1_fe_set_b32(&g_x, secp256k1_ge_consts_g_x));
-        VERIFY_CHECK(secp256k1_fe_set_b32(&g_y, secp256k1_ge_consts_g_y));
-        secp256k1_ge_set_xy(&ret->g, &g_x, &g_y);
-        secp256k1_ge_consts = ret;
-    }
-}
-
-static void secp256k1_ge_stop(void) {
-    if (secp256k1_ge_consts != NULL) {
-        secp256k1_ge_consts_t *c = (secp256k1_ge_consts_t*)secp256k1_ge_consts;
-        free((void*)c);
-        secp256k1_ge_consts = NULL;
-    }
-}
-
 #endif

src/secp256k1.c

@@ -20,9 +20,6 @@
 #include "hash_impl.h"
 
 void secp256k1_start(unsigned int flags) {
-    secp256k1_fe_start();
-    secp256k1_ge_start();
-    secp256k1_ecdsa_start();
     if (flags & SECP256K1_START_SIGN) {
         secp256k1_ecmult_gen_start();
     }
@@ -34,9 +31,6 @@ void secp256k1_start(unsigned int flags) {
 void secp256k1_stop(void) {
     secp256k1_ecmult_stop();
     secp256k1_ecmult_gen_stop();
-    secp256k1_ecdsa_stop();
-    secp256k1_ge_stop();
-    secp256k1_fe_stop();
 }
 
 int secp256k1_ecdsa_verify(const unsigned char *msg32, const unsigned char *sig, int siglen, const unsigned char *pubkey, int pubkeylen) {

src/tests.c

@@ -1657,11 +1657,6 @@ int main(int argc, char **argv) {
     /* initializing a second time shouldn't cause any harm or memory leaks. */
     secp256k1_start(SECP256K1_START_SIGN | SECP256K1_START_VERIFY);
 
-    /* Likewise, re-running the internal init functions should be harmless. */
-    secp256k1_fe_start();
-    secp256k1_ge_start();
-    secp256k1_ecdsa_start();
-
     run_sha256_tests();
     run_hmac_sha256_tests();
     run_rfc6979_hmac_sha256_tests();
@@ -1706,10 +1701,5 @@ int main(int argc, char **argv) {
 
     /* shutting down twice shouldn't cause any double frees. */
     secp256k1_stop();
-
-    /* Same for the internal shutdown functions. */
-    secp256k1_fe_stop();
-    secp256k1_ge_stop();
-    secp256k1_ecdsa_stop();
     return 0;
 }