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i2pd
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correct conversion from Little Endian

pull/1491/head
orignal 5 years ago
parent
d7b819267f
commit
5faf84c732
1 changed files with 12 additions and 13 deletions
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  1. 25
      libi2pd/Elligator.cpp

25
libi2pd/Elligator.cpp
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@ -17,8 +17,8 @@ namespace crypto
p12 = BN_dup (p); BN_sub_word (p12, 1); BN_div_word (p12, 2); // (p-1)/2 p12 = BN_dup (p); BN_sub_word (p12, 1); BN_div_word (p12, 2); // (p-1)/2
p14 = BN_dup (p); BN_sub_word (p14, 1); BN_div_word (p14, 4); // (p-1)/4 p14 = BN_dup (p); BN_sub_word (p14, 1); BN_div_word (p14, 4); // (p-1)/4
auto A = BN_new (); BN_set_word (A, 486662); A = BN_new (); BN_set_word (A, 486662);
nA = BN_new (); BN_sub (nA, p, A); nA = BN_new (); BN_sub (nA, p, A);
BN_CTX * ctx = BN_CTX_new (); BN_CTX * ctx = BN_CTX_new ();
// calculate sqrt(-1) // calculate sqrt(-1)
@ -28,8 +28,7 @@ namespace crypto
u = BN_new (); BN_set_word (u, 2); u = BN_new (); BN_set_word (u, 2);
iu = BN_new (); BN_mod_inverse (iu, u, p, ctx); iu = BN_new (); BN_mod_inverse (iu, u, p, ctx);
//printf ("%s\n", BN_bn2hex (iu));
BN_CTX_free (ctx); BN_CTX_free (ctx);
} }
@ -49,8 +48,8 @@ namespace crypto
uint8_t key1[32]; uint8_t key1[32];
for (size_t i = 0; i < 16; i++) // from Little Endian for (size_t i = 0; i < 16; i++) // from Little Endian
{ {
key1[i] = key[15 - i]; key1[i] = key[31 - i];
key1[15 - i] = key[i]; key1[31 - i] = key[i];
} }
BIGNUM * x = BN_CTX_get (ctx); BN_bin2bn (key1, 32, x); BIGNUM * x = BN_CTX_get (ctx); BN_bin2bn (key1, 32, x);
@ -62,7 +61,7 @@ namespace crypto
BN_mod_mul (uxxA, uxxA, xA, p, ctx); BN_mod_mul (uxxA, uxxA, xA, p, ctx);
if (Legendre (uxxA, ctx) != -1) if (Legendre (uxxA, ctx) != -1)
{ {
BIGNUM * r = BN_CTX_get (ctx); BIGNUM * r = BN_CTX_get (ctx);
BN_mod_inverse (r, xA, p, ctx); BN_mod_inverse (r, xA, p, ctx);
BN_mod_mul (r, r, x, p, ctx); BN_mod_mul (r, r, x, p, ctx);
@ -74,8 +73,8 @@ namespace crypto
for (size_t i = 0; i < 16; i++) // To Little Endian for (size_t i = 0; i < 16; i++) // To Little Endian
{ {
uint8_t tmp = encoded[i]; uint8_t tmp = encoded[i];
encoded[i] = encoded[15 - i]; encoded[i] = encoded[31 - i];
encoded[15 - i] = tmp; encoded[31 - i] = tmp;
} }
} }
else else
@ -95,8 +94,8 @@ namespace crypto
uint8_t encoded1[32]; uint8_t encoded1[32];
for (size_t i = 0; i < 16; i++) // from Little Endian for (size_t i = 0; i < 16; i++) // from Little Endian
{ {
encoded1[i] = encoded[15 - i]; encoded1[i] = encoded[31 - i];
encoded1[15 - i] = encoded[i]; encoded1[31 - i] = encoded[i];
} }
BIGNUM * r = BN_CTX_get (ctx); BN_bin2bn (encoded1, 32, r); BIGNUM * r = BN_CTX_get (ctx); BN_bin2bn (encoded1, 32, r);
@ -131,8 +130,8 @@ namespace crypto
for (size_t i = 0; i < 16; i++) // To Little Endian for (size_t i = 0; i < 16; i++) // To Little Endian
{ {
uint8_t tmp = key[i]; uint8_t tmp = key[i];
key[i] = key[15 - i]; key[i] = key[31 - i];
key[15 - i] = tmp; key[31 - i] = tmp;
} }
} }
else else

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