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315 lines
7.2 KiB
Common Lisp
315 lines
7.2 KiB
Common Lisp
/**
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* Author......: See docs/credits.txt
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* License.....: MIT
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*/
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#include "inc_vendor.h"
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#include "inc_types.h"
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#include "inc_platform.h"
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#include "inc_common.h"
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#include "inc_cipher_aes.h"
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#include "inc_cipher_aes-gcm.h"
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DECLSPEC void AES_GCM_inc32 (PRIVATE_AS u32 *block)
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{
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block[3] += 1;
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}
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DECLSPEC void AES_GCM_xor_block (PRIVATE_AS u32 *dst, PRIVATE_AS const u32 *src)
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{
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dst[0] ^= src[0];
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dst[1] ^= src[1];
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dst[2] ^= src[2];
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dst[3] ^= src[3];
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}
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DECLSPEC void AES_GCM_gf_mult (PRIVATE_AS const u32 *x, PRIVATE_AS const u32 *y, PRIVATE_AS u32 *z)
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{
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z[0] = 0;
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z[1] = 0;
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z[2] = 0;
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z[3] = 0;
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u32 t[4];
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t[0] = y[0];
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t[1] = y[1];
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t[2] = y[2];
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t[3] = y[3];
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for (int i = 0; i < 4; i++)
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{
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const u32 tv = x[i];
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for (int j = 0; j < 32; j++)
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{
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if ((tv >> (31 - j)) & 1)
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{
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z[0] ^= t[0];
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z[1] ^= t[1];
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z[2] ^= t[2];
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z[3] ^= t[3];
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}
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const int m = t[3] & 1; // save lost bit
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t[3] = (t[2] << 31) | (t[3] >> 1);
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t[2] = (t[1] << 31) | (t[2] >> 1);
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t[1] = (t[0] << 31) | (t[1] >> 1);
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t[0] = 0 | (t[0] >> 1);
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t[0] ^= m * 0xe1000000;
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}
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}
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}
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DECLSPEC void AES_GCM_ghash (PRIVATE_AS const u32 *subkey, PRIVATE_AS const u32 *in, int in_len, PRIVATE_AS u32 *out)
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{
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int i;
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int j;
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for (i = 0, j = 0; i < in_len - 15; i += 16, j += 4)
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{
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u32 t2[4];
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t2[0] = in[j + 0];
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t2[1] = in[j + 1];
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t2[2] = in[j + 2];
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t2[3] = in[j + 3];
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AES_GCM_xor_block (out, t2);
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u32 tmp[4];
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AES_GCM_gf_mult (out, subkey, tmp);
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out[0] = tmp[0];
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out[1] = tmp[1];
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out[2] = tmp[2];
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out[3] = tmp[3];
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}
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const int left = in_len - i;
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if (left > 0)
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{
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u32 t2[4];
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t2[0] = (left > 0) ? in[j + 0] : 0;
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t2[1] = (left > 4) ? in[j + 1] : 0;
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t2[2] = (left > 8) ? in[j + 2] : 0;
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t2[3] = (left > 12) ? in[j + 3] : 0;
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AES_GCM_xor_block (out, t2);
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u32 tmp[4];
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AES_GCM_gf_mult (out, subkey, tmp);
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out[0] = tmp[0];
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out[1] = tmp[1];
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out[2] = tmp[2];
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out[3] = tmp[3];
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}
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}
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DECLSPEC void AES_GCM_ghash_global (PRIVATE_AS const u32 *subkey, GLOBAL_AS const u32 *in, int in_len, PRIVATE_AS u32 *out)
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{
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int i;
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int j;
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for (i = 0, j = 0; i < in_len - 15; i += 16, j += 4)
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{
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u32 t2[4];
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t2[0] = in[j + 0];
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t2[1] = in[j + 1];
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t2[2] = in[j + 2];
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t2[3] = in[j + 3];
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AES_GCM_xor_block (out, t2);
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u32 tmp[4];
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AES_GCM_gf_mult (out, subkey, tmp);
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out[0] = tmp[0];
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out[1] = tmp[1];
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out[2] = tmp[2];
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out[3] = tmp[3];
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}
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const int left = in_len - i;
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if (left > 0)
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{
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u32 t2[4];
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t2[0] = (left > 0) ? in[j + 0] : 0;
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t2[1] = (left > 4) ? in[j + 1] : 0;
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t2[2] = (left > 8) ? in[j + 2] : 0;
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t2[3] = (left > 12) ? in[j + 3] : 0;
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AES_GCM_xor_block (out, t2);
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u32 tmp[4];
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AES_GCM_gf_mult (out, subkey, tmp);
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out[0] = tmp[0];
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out[1] = tmp[1];
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out[2] = tmp[2];
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out[3] = tmp[3];
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}
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}
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DECLSPEC void AES_GCM_Init (PRIVATE_AS const u32 *ukey, int key_len, PRIVATE_AS u32 *key, PRIVATE_AS u32 *subkey, SHM_TYPE u32 *s_te0, SHM_TYPE u32 *s_te1, SHM_TYPE u32 *s_te2, SHM_TYPE u32 *s_te3, SHM_TYPE u32 *s_te4)
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{
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if (key_len == 128)
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{
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AES128_set_encrypt_key (key, ukey, s_te0, s_te1, s_te2, s_te3);
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AES192_encrypt (key, subkey, subkey, s_te0, s_te1, s_te2, s_te3, s_te4);
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}
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else if (key_len == 192)
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{
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AES192_set_encrypt_key (key, ukey, s_te0, s_te1, s_te2, s_te3);
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AES192_encrypt (key, subkey, subkey, s_te0, s_te1, s_te2, s_te3, s_te4);
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}
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else if (key_len == 256)
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{
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AES256_set_encrypt_key (key, ukey, s_te0, s_te1, s_te2, s_te3);
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AES256_encrypt (key, subkey, subkey, s_te0, s_te1, s_te2, s_te3, s_te4);
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}
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}
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DECLSPEC void AES_GCM_Prepare_J0 (PRIVATE_AS const u32 *iv, int iv_len, PRIVATE_AS const u32 *subkey, PRIVATE_AS u32 *J0)
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{
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if (iv_len == 12)
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{
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J0[0] = iv[0];
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J0[1] = iv[1];
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J0[2] = iv[2];
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J0[3] = 0x00000001;
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}
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else
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{
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AES_GCM_ghash (subkey, iv, iv_len, J0);
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u32 len_buf[4] = { 0 };
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len_buf[3] = iv_len * 8;
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AES_GCM_ghash (subkey, len_buf, 16, J0);
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}
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}
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DECLSPEC void AES_GCM_gctr (PRIVATE_AS const u32 *key, PRIVATE_AS const u32 *iv, PRIVATE_AS const u32 *in, int in_len, PRIVATE_AS u32 *out, SHM_TYPE u32 *s_te0, SHM_TYPE u32 *s_te1, SHM_TYPE u32 *s_te2, SHM_TYPE u32 *s_te3, SHM_TYPE u32 *s_te4)
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{
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PRIVATE_AS const u32 *xpos = (PRIVATE_AS u32 *) in;
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PRIVATE_AS u32 *ypos = (PRIVATE_AS u32 *) out;
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u32 iv_buf[4];
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iv_buf[0] = iv[0];
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iv_buf[1] = iv[1];
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iv_buf[2] = iv[2];
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iv_buf[3] = iv[3];
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const u32 n = in_len / 16;
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for (u32 i = 0; i < n; i++)
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{
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AES256_encrypt (key, iv_buf, ypos, s_te0, s_te1, s_te2, s_te3, s_te4);
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AES_GCM_xor_block (ypos, xpos);
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xpos += 4;
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ypos += 4;
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AES_GCM_inc32 (iv_buf);
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}
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// this is not byte accurate but 4-byte accurate. needs fix?
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int last = in + (in_len/4) - xpos;
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if (last)
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{
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u32 tmp[4] = { 0 };
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AES256_encrypt (key, iv_buf, tmp, s_te0, s_te1, s_te2, s_te3, s_te4);
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if (last >= 1) *ypos++ = *xpos++ ^ tmp[0];
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if (last >= 2) *ypos++ = *xpos++ ^ tmp[1];
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if (last >= 3) *ypos++ = *xpos++ ^ tmp[2];
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}
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}
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DECLSPEC void AES_GCM_GCTR (PRIVATE_AS u32 *key, PRIVATE_AS u32 *J0, PRIVATE_AS const u32 *in, int in_len, PRIVATE_AS u32 *out, SHM_TYPE u32 *s_te0, SHM_TYPE u32 *s_te1, SHM_TYPE u32 *s_te2, SHM_TYPE u32 *s_te3, SHM_TYPE u32 *s_te4)
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{
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u32 J0_incr[4];
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J0_incr[0] = J0[0];
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J0_incr[1] = J0[1];
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J0_incr[2] = J0[2];
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J0_incr[3] = J0[3];
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AES_GCM_gctr (key, J0_incr, in, in_len, out, s_te0, s_te1, s_te2, s_te3, s_te4);
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}
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DECLSPEC void AES_GCM_GHASH (PRIVATE_AS const u32 *subkey, PRIVATE_AS const u32 *aad_buf, int aad_len, PRIVATE_AS const u32 *enc_buf, int enc_len, PRIVATE_AS u32 *out)
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{
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out[0] = 0;
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out[1] = 0;
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out[2] = 0;
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out[3] = 0;
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AES_GCM_ghash (subkey, aad_buf, aad_len, out);
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AES_GCM_ghash (subkey, enc_buf, enc_len, out);
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u32 len_buf[4];
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// still not fully correct if len > 32 bit
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len_buf[0] = aad_len >> 29;
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len_buf[1] = aad_len << 3;
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len_buf[2] = enc_len >> 29;
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len_buf[3] = enc_len << 3;
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AES_GCM_ghash (subkey, len_buf, 16, out);
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}
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DECLSPEC void AES_GCM_GHASH_GLOBAL (PRIVATE_AS const u32 *subkey, PRIVATE_AS const u32 *aad_buf, int aad_len, GLOBAL_AS const u32 *enc_buf, int enc_len, PRIVATE_AS u32 *out)
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{
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out[0] = 0;
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out[1] = 0;
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out[2] = 0;
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out[3] = 0;
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AES_GCM_ghash (subkey, aad_buf, aad_len, out);
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AES_GCM_ghash_global (subkey, enc_buf, enc_len, out);
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u32 len_buf[4];
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// still not fully correct if len > 32 bit
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len_buf[0] = aad_len >> 29;
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len_buf[1] = aad_len << 3;
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len_buf[2] = enc_len >> 29;
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len_buf[3] = enc_len << 3;
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AES_GCM_ghash (subkey, len_buf, 16, out);
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}
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DECLSPEC void AES_GCM_decrypt (PRIVATE_AS u32 *key, PRIVATE_AS u32 *J0, PRIVATE_AS const u32 *in, int in_len, PRIVATE_AS u32 *out, SHM_TYPE u32 *s_te0, SHM_TYPE u32 *s_te1, SHM_TYPE u32 *s_te2, SHM_TYPE u32 *s_te3, SHM_TYPE u32 *s_te4)
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{
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// the first ctr is used to compute the tag, only the second is used for decryption: https://en.wikipedia.org/wiki/Galois/Counter_Mode#/media/File:GCM-Galois_Counter_Mode_with_IV.svg
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AES_GCM_inc32 (J0);
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// decrypt the first block of ciphertext
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AES_GCM_GCTR (key, J0, in, in_len, out, s_te0, s_te1, s_te2, s_te3, s_te4);
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}
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