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Code Issues Projects Releases Packages Wiki Activity Actions 6

eliminate some BIGNUM allocation overhead

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orignal 2017-03-07 14:51:05 -05:00
parent 0e8d80e055
commit 955b46534d
1 changed files with 3 additions and 2 deletions
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5
Crypto.cpp
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@ -331,7 +331,8 @@ namespace crypto
uint8_t * data, bool zeroPadding) uint8_t * data, bool zeroPadding)
{ {
BN_CTX * ctx = BN_CTX_new (); BN_CTX * ctx = BN_CTX_new ();
BIGNUM * x = BN_new (), * a = BN_new (), * b = BN_new (); BN_CTX_start (ctx);
BIGNUM * x = BN_CTX_get (ctx), * a = BN_CTX_get (ctx), * b = BN_CTX_get (ctx);
BN_bin2bn (key, 256, x); BN_bin2bn (key, 256, x);
BN_sub (x, elgp, x); BN_sub_word (x, 1); // x = elgp - x- 1 BN_sub (x, elgp, x); BN_sub_word (x, 1); // x = elgp - x- 1
BN_bin2bn (zeroPadding ? encrypted + 1 : encrypted, 256, a); BN_bin2bn (zeroPadding ? encrypted + 1 : encrypted, 256, a);
@ -341,7 +342,7 @@ namespace crypto
BN_mod_mul (b, b, x, elgp, ctx); BN_mod_mul (b, b, x, elgp, ctx);
uint8_t m[255]; uint8_t m[255];
bn2buf (b, m, 255); bn2buf (b, m, 255);
BN_free (x); BN_free (a); BN_free (b); BN_CTX_end (ctx);
BN_CTX_free (ctx); BN_CTX_free (ctx);
uint8_t hash[32]; uint8_t hash[32];
SHA256 (m + 33, 222, hash); SHA256 (m + 33, 222, hash);