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Abstract out verify logic for fe_get_b32

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This commit is contained in:
Pieter Wuille 2022-01-28 18:23:54 -05:00
parent f7a7666aeb
commit 144670893e
4 changed files with 14 additions and 11 deletions
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6
src/field.h
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@ -86,6 +86,7 @@ static const secp256k1_fe secp256k1_const_beta = SECP256K1_FE_CONST(
# define secp256k1_fe_is_odd secp256k1_fe_impl_is_odd
# define secp256k1_fe_cmp_var secp256k1_fe_impl_cmp_var
# define secp256k1_fe_set_b32 secp256k1_fe_impl_set_b32
# define secp256k1_fe_get_b32 secp256k1_fe_impl_get_b32
#endif /* !defined(VERIFY) */
/** Normalize a field element.
@ -185,7 +186,10 @@ static int secp256k1_fe_cmp_var(const secp256k1_fe *a, const secp256k1_fe *b);
*/
static int secp256k1_fe_set_b32(secp256k1_fe *r, const unsigned char *a);
/** Convert a field element to a 32-byte big endian value. Requires the input to be normalized */
/** Convert a field element to 32-byte big endian byte array.
* On input, a must be a valid normalized field element, and r a pointer to a 32-byte array.
* On output, r = a (mod p).
*/
static void secp256k1_fe_get_b32(unsigned char *r, const secp256k1_fe *a);
/** Set a field element equal to the additive inverse of another. Takes a maximum magnitude of the input

6
src/field_10x26_impl.h
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@ -314,11 +314,7 @@ static int secp256k1_fe_impl_set_b32(secp256k1_fe *r, const unsigned char *a) {
}
/** Convert a field element to a 32-byte big endian value. Requires the input to be normalized */
static void secp256k1_fe_get_b32(unsigned char *r, const secp256k1_fe *a) {
#ifdef VERIFY
VERIFY_CHECK(a->normalized);
secp256k1_fe_verify(a);
#endif
static void secp256k1_fe_impl_get_b32(unsigned char *r, const secp256k1_fe *a) {
r[0] = (a->n[9] >> 14) & 0xff;
r[1] = (a->n[9] >> 6) & 0xff;
r[2] = ((a->n[9] & 0x3F) << 2) | ((a->n[8] >> 24) & 0x3);

6
src/field_5x52_impl.h
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@ -283,11 +283,7 @@ static int secp256k1_fe_impl_set_b32(secp256k1_fe *r, const unsigned char *a) {
}
/** Convert a field element to a 32-byte big endian value. Requires the input to be normalized */
static void secp256k1_fe_get_b32(unsigned char *r, const secp256k1_fe *a) {
#ifdef VERIFY
VERIFY_CHECK(a->normalized);
secp256k1_fe_verify(a);
#endif
static void secp256k1_fe_impl_get_b32(unsigned char *r, const secp256k1_fe *a) {
r[0] = (a->n[4] >> 40) & 0xFF;
r[1] = (a->n[4] >> 32) & 0xFF;
r[2] = (a->n[4] >> 24) & 0xFF;

7
src/field_impl.h
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@ -246,6 +246,13 @@ SECP256K1_INLINE static int secp256k1_fe_set_b32(secp256k1_fe *r, const unsigned
secp256k1_fe_verify(r);
return ret;
}
static void secp256k1_fe_impl_get_b32(unsigned char *r, const secp256k1_fe *a);
SECP256K1_INLINE static void secp256k1_fe_get_b32(unsigned char *r, const secp256k1_fe *a) {
secp256k1_fe_verify(a);
VERIFY_CHECK(a->normalized);
secp256k1_fe_impl_get_b32(r, a);
}
#endif /* defined(VERIFY) */
#endif /* SECP256K1_FIELD_IMPL_H */