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m26610 second block of AES-GCM also decrypting

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Your Name 2023-03-08 00:15:51 +01:00
parent 6bc86d06b1
commit b035c6e408
1 changed files with 19 additions and 4 deletions
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OpenCL/m26610-pure.cl
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@ -348,22 +348,37 @@ KERNEL_FQ void m26610_comp (KERN_ATTR_TMPS_ESALT (pbkdf2_sha256_tmp_t, pbkdf2_sh
AES_GCM_Prepare_J0 (iv, iv_len, subKey, J0);
//ct
//first block of ciphertext
u32 ct[4] = {
esalt_bufs[DIGESTS_OFFSET_HOST].ct_buf[0],
esalt_bufs[DIGESTS_OFFSET_HOST].ct_buf[1],
esalt_bufs[DIGESTS_OFFSET_HOST].ct_buf[2],
esalt_bufs[DIGESTS_OFFSET_HOST].ct_buf[3]
esalt_bufs[DIGESTS_OFFSET_HOST].ct_buf[3]
};
// second block of ciphertext
u32 ct2[4] = {
esalt_bufs[DIGESTS_OFFSET_HOST].ct_buf[4],
esalt_bufs[DIGESTS_OFFSET_HOST].ct_buf[5],
esalt_bufs[DIGESTS_OFFSET_HOST].ct_buf[6],
esalt_bufs[DIGESTS_OFFSET_HOST].ct_buf[7]
};
//if ((gid == 0) && (lid == 0)) printf("esalt_bufs[DIGESTS_OFFSET_HOST].ct_buf[3]=0x%08x\n", esalt_bufs[DIGESTS_OFFSET_HOST].ct_buf[3]);
//if ((gid == 0) && (lid == 0)) printf("esalt_bufs[DIGESTS_OFFSET_HOST].ct_buf[4]=0x%08x\n", esalt_bufs[DIGESTS_OFFSET_HOST].ct_buf[4]);
u32 pt[4] = { 0 };
u32 pt2[4] = { 0 };
// we try to decrypt the ciphertext
// TODO this can be moved to a separate decryption function in inc_cipher_aes-gcm.cl
AES_GCM_inc32(J0); // 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
AES_GCM_GCTR (key, J0, ct, 16, pt, s_te0, s_te1, s_te2, s_te3, s_te4); // decrypt the ciphertext
AES_GCM_GCTR (key, J0, ct, 16, pt, s_te0, s_te1, s_te2, s_te3, s_te4); // decrypt the first block of ciphertext
// if ((gid == 0) && (lid == 0)) printf ("pt[0]=%08x\n", pt[0]); // should be 5b7b2274 or [{"type"
AES_GCM_inc32(J0);
AES_GCM_GCTR (key, J0, ct2, 16, pt2, s_te0, s_te1, s_te2, s_te3, s_te4); // decrypt the second block of ciphertext
//if ((gid == 0) && (lid == 0)) printf ("pt[0]=%08x\n", pt[0]); // should be 5b7b2274 or [{"type"
if ((gid == 0) && (lid == 0)) printf ("pt2[0]=%08x%08x\n", pt2[0], pt2[1]); // should be 2054726565222c22 or Tree","
// cast plaintext buffer to byte such that we can do a byte per byte comparison
PRIVATE_AS const u32 *u32OutBufPtr = (PRIVATE_AS u32 *) pt;