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use common context for ElGamal encrypt/decrypt

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This commit is contained in:
orignal 2017-03-11 16:48:54 -05:00
parent 4bb607f180
commit c0c157ecef
7 changed files with 27 additions and 19 deletions
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8
Crypto.cpp
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@ -272,9 +272,8 @@ namespace crypto
}
// ElGamal
void ElGamalEncrypt (const uint8_t * key, const uint8_t * data, uint8_t * encrypted, bool zeroPadding)
void ElGamalEncrypt (const uint8_t * key, const uint8_t * data, uint8_t * encrypted, BN_CTX * ctx, bool zeroPadding)
{
BN_CTX * ctx = BN_CTX_new ();
BN_CTX_start (ctx);
// everything, but a, because a might come from table
BIGNUM * k = BN_CTX_get (ctx);
@ -324,13 +323,11 @@ namespace crypto
}
BN_free (a);
BN_CTX_end (ctx);
BN_CTX_free (ctx);
}
bool ElGamalDecrypt (const uint8_t * key, const uint8_t * encrypted,
uint8_t * data, bool zeroPadding)
uint8_t * data, BN_CTX * ctx, bool zeroPadding)
{
BN_CTX * ctx = BN_CTX_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);
@ -343,7 +340,6 @@ namespace crypto
uint8_t m[255];
bn2buf (b, m, 255);
BN_CTX_end (ctx);
BN_CTX_free (ctx);
uint8_t hash[32];
SHA256 (m + 33, 222, hash);
if (memcmp (m + 1, hash, 32))