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Add chacha-sys crate (#4620)

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* af9ff9c7f9/src/cpu-crypt

* Add chacha-sys crate

* Remove chacha feature

* Remove erasure feature

* Add .gitignore
This commit is contained in:
Michael Vines
2019-06-10 07:14:02 -07:00
committed by GitHub
parent 6926e89e86
commit 0dbe5ee559
32 changed files with 320 additions and 80 deletions
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72
chacha-sys/cpu-crypt/chacha_cbc.c Normal file
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#include "chacha.h"
#if !defined(STRICT_ALIGNMENT) && !defined(PEDANTIC)
# define STRICT_ALIGNMENT 0
#endif
void chacha20_cbc128_encrypt(const unsigned char* in, unsigned char* out,
uint32_t len, const uint8_t* key,
unsigned char* ivec)
{
size_t n;
unsigned char *iv = ivec;
if (len == 0) {
return;
}
#if !defined(OPENSSL_SMALL_FOOTPRINT)
if (STRICT_ALIGNMENT &&
((size_t)in | (size_t)out | (size_t)ivec) % sizeof(size_t) != 0) {
while (len >= CHACHA_BLOCK_SIZE) {
for (n = 0; n < CHACHA_BLOCK_SIZE; ++n) {
out[n] = in[n] ^ iv[n];
//printf("%x ", out[n]);
}
chacha20_encrypt((const u32*)out, out, CHACHA_ROUNDS);
iv = out;
len -= CHACHA_BLOCK_SIZE;
in += CHACHA_BLOCK_SIZE;
out += CHACHA_BLOCK_SIZE;
}
} else {
while (len >= CHACHA_BLOCK_SIZE) {
for (n = 0; n < CHACHA_BLOCK_SIZE; n += sizeof(size_t)) {
*(size_t *)(out + n) =
*(size_t *)(in + n) ^ *(size_t *)(iv + n);
//printf("%zu ", *(size_t *)(iv + n));
}
chacha20_encrypt((const u32*)out, out, CHACHA_ROUNDS);
iv = out;
len -= CHACHA_BLOCK_SIZE;
in += CHACHA_BLOCK_SIZE;
out += CHACHA_BLOCK_SIZE;
}
}
#endif
while (len) {
for (n = 0; n < CHACHA_BLOCK_SIZE && n < len; ++n) {
out[n] = in[n] ^ iv[n];
}
for (; n < CHACHA_BLOCK_SIZE; ++n) {
out[n] = iv[n];
}
chacha20_encrypt((const u32*)out, out, CHACHA_ROUNDS);
iv = out;
if (len <= CHACHA_BLOCK_SIZE) {
break;
}
len -= CHACHA_BLOCK_SIZE;
in += CHACHA_BLOCK_SIZE;
out += CHACHA_BLOCK_SIZE;
}
memcpy(ivec, iv, CHACHA_BLOCK_SIZE);
}
void chacha20_cbc_encrypt(const uint8_t *in, uint8_t *out, size_t in_len,
const uint8_t key[CHACHA_KEY_SIZE], uint8_t* ivec)
{
chacha20_cbc128_encrypt(in, out, in_len, key, ivec);
}