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Be more paranoid: generate 2 keys

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This commit is contained in:
angt
2015-11-13 17:57:21 +01:00
parent ef0561764f
commit e2a6aeced7
1 changed files with 14 additions and 9 deletions
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23
src/main.c
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@@ -38,7 +38,8 @@ struct netio {
};
struct crypto_ctx {
crypto_aead_aes256gcm_state state;
crypto_aead_aes256gcm_state state_r;
crypto_aead_aes256gcm_state state_w;
uint8_t nonce_r[crypto_aead_aes256gcm_NPUBBYTES];
uint8_t nonce_w[crypto_aead_aes256gcm_NPUBBYTES];
uint8_t skey[crypto_generichash_KEYBYTES];
@@ -466,7 +467,7 @@ static int encrypt_packet (struct crypto_ctx *ctx, uint8_t *packet, size_t size,
packet + hs, size - hs,
packet, hs,
NULL, ctx->nonce_w,
(const crypto_aead_aes256gcm_state *)&ctx->state);
(const crypto_aead_aes256gcm_state *)&ctx->state_w);
sodium_increment(ctx->nonce_w, crypto_aead_aes256gcm_NPUBBYTES);
buffer->write += ws;
@@ -491,7 +492,7 @@ static int decrypt_packet (struct crypto_ctx *ctx, uint8_t *packet, size_t size,
buffer->read + hs, rs - hs,
packet, hs,
ctx->nonce_r,
(const crypto_aead_aes256gcm_state *)&ctx->state))
(const crypto_aead_aes256gcm_state *)&ctx->state_r))
return -1;
sodium_increment(ctx->nonce_r, crypto_aead_aes256gcm_NPUBBYTES);
@@ -575,7 +576,7 @@ static int gt_setup_crypto (struct crypto_ctx *ctx, int fd, int listener)
uint8_t shared[crypto_scalarmult_BYTES];
uint8_t key[crypto_aead_aes256gcm_KEYBYTES];
uint8_t data_r[size], data_w[size], data_x[size];
uint8_t data_r[size], data_w[size];
uint8_t hkey_c[hkey_size];
randombytes_buf(data_w, nonce_size);
@@ -600,18 +601,22 @@ static int gt_setup_crypto (struct crypto_ctx *ctx, int fd, int listener)
if (listener && fd_write_all(fd, data_w, size)!=size)
return -1;
for (size_t i=0; i<size; i++)
data_x[i] = data_r[i]^data_w[i];
crypto_scalarmult(shared, secret, &data_r[nonce_size]);
crypto_generichash_state state;
crypto_generichash_init(&state, ctx->skey, sizeof(ctx->skey), sizeof(key));
crypto_generichash_update(&state, shared, sizeof(shared));
crypto_generichash_update(&state, data_x, size);
crypto_generichash_update(&state, data_r, size);
crypto_generichash_update(&state, data_w, size);
crypto_generichash_final(&state, key, sizeof(key));
crypto_aead_aes256gcm_beforenm(&ctx->state_r, key);
crypto_aead_aes256gcm_beforenm(&ctx->state, key);
crypto_generichash_init(&state, ctx->skey, sizeof(ctx->skey), sizeof(key));
crypto_generichash_update(&state, shared, sizeof(shared));
crypto_generichash_update(&state, data_w, size);
crypto_generichash_update(&state, data_r, size);
crypto_generichash_final(&state, key, sizeof(key));
crypto_aead_aes256gcm_beforenm(&ctx->state_w, key);
sodium_memzero(secret, sizeof(secret));
sodium_memzero(shared, sizeof(shared));