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When encrypting, use temporary file if file gets too big

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This commit is contained in:
Andrew Ayer
2012-07-16 16:57:05 -07:00
parent 3f6523bd7f
commit 0dcf864798
6 changed files with 133 additions and 29 deletions
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28
crypto.cpp
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@@ -43,7 +43,7 @@ aes_ctr_state::aes_ctr_state (const uint8_t* arg_nonce, size_t arg_nonce_len)
memset(otp, '\0', sizeof(otp));
}
void aes_ctr_state::process_block (const AES_KEY* key, const uint8_t* in, uint8_t* out, size_t len)
void aes_ctr_state::process (const AES_KEY* key, const uint8_t* in, uint8_t* out, size_t len)
{
for (size_t i = 0; i < len; ++i) {
if (byte_counter % 16 == 0) {
@@ -63,14 +63,28 @@ void aes_ctr_state::process_block (const AES_KEY* key, const uint8_t* in, uint8_
}
}
// Compute HMAC-SHA1-96 (i.e. first 96 bits of HMAC-SHA1) for the given buffer with the given key
void hmac_sha1_96 (uint8_t* out, const uint8_t* buffer, size_t buffer_len, const uint8_t* key, size_t key_len)
hmac_sha1_state::hmac_sha1_state (const uint8_t* key, size_t key_len)
{
uint8_t full_digest[20];
HMAC(EVP_sha1(), key, key_len, buffer, buffer_len, full_digest, NULL);
memcpy(out, full_digest, 12); // Truncate to first 96 bits
HMAC_Init(&ctx, key, key_len, EVP_sha1());
}
hmac_sha1_state::~hmac_sha1_state ()
{
HMAC_cleanup(&ctx);
}
void hmac_sha1_state::add (const uint8_t* buffer, size_t buffer_len)
{
HMAC_Update(&ctx, buffer, buffer_len);
}
void hmac_sha1_state::get (uint8_t* digest)
{
unsigned int len;
HMAC_Final(&ctx, digest, &len);
}
// Encrypt/decrypt an entire input stream, writing to the given output stream
void process_stream (std::istream& in, std::ostream& out, const AES_KEY* enc_key, const uint8_t* nonce)
{
@@ -79,7 +93,7 @@ void process_stream (std::istream& in, std::ostream& out, const AES_KEY* enc_key
uint8_t buffer[1024];
while (in) {
in.read(reinterpret_cast<char*>(buffer), sizeof(buffer));
state.process_block(enc_key, buffer, buffer, in.gcount());
state.process(enc_key, buffer, buffer, in.gcount());
out.write(reinterpret_cast<char*>(buffer), in.gcount());
}
}