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mbedtls/library/gcm.c
harshal.patil 803d5e8c91 gcm: Support software fallback for non-AES ciphers in a gcm operation. 
When MBEDTLS_HARDWARE_GCM is enabled, we ALT all the GCM functions that are
declared in mbedtls/gcm.h with our H/W port functions, due to which even
if non-AES ciphers such as ARIA, CAMELLIA, BLOWFISH, etc. are selected
for a GCM operation, we perform an AES-GCM operation, thus resulting into
an incorrect calculation.
Thus in such cases we need to fallback to the software definitions of
GCM.

Currently, it is not directly possible to pull in software definitions of GCM
related functions directly due to gcm_alt.h, but this commit renames the
functions by appending `_soft` to their names, thus making them look different
functions in all and thus they are made available to pull in during compilation.

The change is configrable using the config MBEDTLS_GCM_NON_AES_CIPHER_SOFT_FALLBACK.
As this config is enabled by default, building the mbedtls crypto library
(libmbedcrypto.a) with this change increases its size by ~2.5KB.
2024-09-06 14:53:57 +05:30

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/*
* NIST SP800-38D compliant GCM implementation
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
*/
/*
* http://csrc.nist.gov/publications/nistpubs/800-38D/SP-800-38D.pdf
*
* See also:
* [MGV] http://csrc.nist.gov/groups/ST/toolkit/BCM/documents/proposedmodes/gcm/gcm-revised-spec.pdf
*
* We use the algorithm described as Shoup's method with 4-bit tables in
* [MGV] 4.1, pp. 12-13, to enhance speed without using too much memory.
*/
#include "common.h"
#if defined(MBEDTLS_GCM_C)
#include "mbedtls/gcm.h"
#include "mbedtls/platform.h"
#include "mbedtls/platform_util.h"
#include "mbedtls/error.h"
#include "mbedtls/constant_time.h"
#if defined(MBEDTLS_BLOCK_CIPHER_C)
#include "block_cipher_internal.h"
#endif
#include <string.h>
#if defined(MBEDTLS_AESNI_C)
#include "aesni.h"
#endif
#if defined(MBEDTLS_AESCE_C)
#include "aesce.h"
#endif
#if defined(MBEDTLS_GCM_NON_AES_CIPHER_SOFT_FALLBACK)
#undef mbedtls_gcm_context
#undef mbedtls_gcm_init
#undef mbedtls_gcm_setkey
#undef mbedtls_gcm_starts
#undef mbedtls_gcm_update_ad
#undef mbedtls_gcm_update
#undef mbedtls_gcm_finish
#undef mbedtls_gcm_crypt_and_tag
#undef mbedtls_gcm_auth_decrypt
#undef mbedtls_gcm_free
#define mbedtls_gcm_context mbedtls_gcm_context_soft
#define mbedtls_gcm_init mbedtls_gcm_init_soft
#define mbedtls_gcm_setkey mbedtls_gcm_setkey_soft
#define mbedtls_gcm_starts mbedtls_gcm_starts_soft
#define mbedtls_gcm_update_ad mbedtls_gcm_update_ad_soft
#define mbedtls_gcm_update mbedtls_gcm_update_soft
#define mbedtls_gcm_finish mbedtls_gcm_finish_soft
#define mbedtls_gcm_crypt_and_tag mbedtls_gcm_crypt_and_tag_soft
#define mbedtls_gcm_auth_decrypt mbedtls_gcm_auth_decrypt_soft
#define mbedtls_gcm_free mbedtls_gcm_free_soft
#endif
#if !defined(MBEDTLS_GCM_ALT) || defined(MBEDTLS_GCM_NON_AES_CIPHER_SOFT_FALLBACK)
/* Used to select the acceleration mechanism */
#define MBEDTLS_GCM_ACC_SMALLTABLE 0
#define MBEDTLS_GCM_ACC_LARGETABLE 1
#define MBEDTLS_GCM_ACC_AESNI 2
#define MBEDTLS_GCM_ACC_AESCE 3
/*
* Initialize a context
*/
void mbedtls_gcm_init(mbedtls_gcm_context *ctx)
{
memset(ctx, 0, sizeof(mbedtls_gcm_context));
}
static inline void gcm_set_acceleration(mbedtls_gcm_context *ctx)
{
#if defined(MBEDTLS_GCM_LARGE_TABLE)
ctx->acceleration = MBEDTLS_GCM_ACC_LARGETABLE;
#else
ctx->acceleration = MBEDTLS_GCM_ACC_SMALLTABLE;
#endif
#if defined(MBEDTLS_AESNI_HAVE_CODE)
/* With CLMUL support, we need only h, not the rest of the table */
if (mbedtls_aesni_has_support(MBEDTLS_AESNI_CLMUL)) {
ctx->acceleration = MBEDTLS_GCM_ACC_AESNI;
}
#endif
#if defined(MBEDTLS_AESCE_HAVE_CODE)
if (MBEDTLS_AESCE_HAS_SUPPORT()) {
ctx->acceleration = MBEDTLS_GCM_ACC_AESCE;
}
#endif
}
static inline void gcm_gen_table_rightshift(uint64_t dst[2], const uint64_t src[2])
{
uint8_t *u8Dst = (uint8_t *) dst;
uint8_t *u8Src = (uint8_t *) src;
MBEDTLS_PUT_UINT64_BE(MBEDTLS_GET_UINT64_BE(&src[1], 0) >> 1, &dst[1], 0);
u8Dst[8] |= (u8Src[7] & 0x01) << 7;
MBEDTLS_PUT_UINT64_BE(MBEDTLS_GET_UINT64_BE(&src[0], 0) >> 1, &dst[0], 0);
u8Dst[0] ^= (u8Src[15] & 0x01) ? 0xE1 : 0;
}
/*
* Precompute small multiples of H, that is set
* HH[i] || HL[i] = H times i,
* where i is seen as a field element as in [MGV], ie high-order bits
* correspond to low powers of P. The result is stored in the same way, that
* is the high-order bit of HH corresponds to P^0 and the low-order bit of HL
* corresponds to P^127.
*/
static int gcm_gen_table(mbedtls_gcm_context *ctx)
{
int ret, i, j;
uint64_t u64h[2] = { 0 };
uint8_t *h = (uint8_t *) u64h;
#if defined(MBEDTLS_BLOCK_CIPHER_C)
ret = mbedtls_block_cipher_encrypt(&ctx->block_cipher_ctx, h, h);
#else
size_t olen = 0;
ret = mbedtls_cipher_update(&ctx->cipher_ctx, h, 16, h, &olen);
#endif
if (ret != 0) {
return ret;
}
gcm_set_acceleration(ctx);
/* MBEDTLS_GCM_HTABLE_SIZE/2 = 1000 corresponds to 1 in GF(2^128) */
ctx->H[MBEDTLS_GCM_HTABLE_SIZE/2][0] = u64h[0];
ctx->H[MBEDTLS_GCM_HTABLE_SIZE/2][1] = u64h[1];
switch (ctx->acceleration) {
#if defined(MBEDTLS_AESNI_HAVE_CODE)
case MBEDTLS_GCM_ACC_AESNI:
return 0;
#endif
#if defined(MBEDTLS_AESCE_HAVE_CODE)
case MBEDTLS_GCM_ACC_AESCE:
return 0;
#endif
default:
/* 0 corresponds to 0 in GF(2^128) */
ctx->H[0][0] = 0;
ctx->H[0][1] = 0;
for (i = MBEDTLS_GCM_HTABLE_SIZE/4; i > 0; i >>= 1) {
gcm_gen_table_rightshift(ctx->H[i], ctx->H[i*2]);
}
#if !defined(MBEDTLS_GCM_LARGE_TABLE)
/* pack elements of H as 64-bits ints, big-endian */
for (i = MBEDTLS_GCM_HTABLE_SIZE/2; i > 0; i >>= 1) {
MBEDTLS_PUT_UINT64_BE(ctx->H[i][0], &ctx->H[i][0], 0);
MBEDTLS_PUT_UINT64_BE(ctx->H[i][1], &ctx->H[i][1], 0);
}
#endif
for (i = 2; i < MBEDTLS_GCM_HTABLE_SIZE; i <<= 1) {
for (j = 1; j < i; j++) {
mbedtls_xor_no_simd((unsigned char *) ctx->H[i+j],
(unsigned char *) ctx->H[i],
(unsigned char *) ctx->H[j],
16);
}
}
}
return 0;
}
int mbedtls_gcm_setkey(mbedtls_gcm_context *ctx,
mbedtls_cipher_id_t cipher,
const unsigned char *key,
unsigned int keybits)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
if (keybits != 128 && keybits != 192 && keybits != 256) {
return MBEDTLS_ERR_GCM_BAD_INPUT;
}
#if defined(MBEDTLS_BLOCK_CIPHER_C)
mbedtls_block_cipher_free(&ctx->block_cipher_ctx);
if ((ret = mbedtls_block_cipher_setup(&ctx->block_cipher_ctx, cipher)) != 0) {
return ret;
}
if ((ret = mbedtls_block_cipher_setkey(&ctx->block_cipher_ctx, key, keybits)) != 0) {
return ret;
}
#else
const mbedtls_cipher_info_t *cipher_info;
cipher_info = mbedtls_cipher_info_from_values(cipher, keybits,
MBEDTLS_MODE_ECB);
if (cipher_info == NULL) {
return MBEDTLS_ERR_GCM_BAD_INPUT;
}
if (mbedtls_cipher_info_get_block_size(cipher_info) != 16) {
return MBEDTLS_ERR_GCM_BAD_INPUT;
}
mbedtls_cipher_free(&ctx->cipher_ctx);
if ((ret = mbedtls_cipher_setup(&ctx->cipher_ctx, cipher_info)) != 0) {
return ret;
}
if ((ret = mbedtls_cipher_setkey(&ctx->cipher_ctx, key, keybits,
MBEDTLS_ENCRYPT)) != 0) {
return ret;
}
#endif
if ((ret = gcm_gen_table(ctx)) != 0) {
return ret;
}
return 0;
}
#if defined(MBEDTLS_GCM_LARGE_TABLE)
static const uint16_t last8[256] = {
0x0000, 0xc201, 0x8403, 0x4602, 0x0807, 0xca06, 0x8c04, 0x4e05,
0x100e, 0xd20f, 0x940d, 0x560c, 0x1809, 0xda08, 0x9c0a, 0x5e0b,
0x201c, 0xe21d, 0xa41f, 0x661e, 0x281b, 0xea1a, 0xac18, 0x6e19,
0x3012, 0xf213, 0xb411, 0x7610, 0x3815, 0xfa14, 0xbc16, 0x7e17,
0x4038, 0x8239, 0xc43b, 0x063a, 0x483f, 0x8a3e, 0xcc3c, 0x0e3d,
0x5036, 0x9237, 0xd435, 0x1634, 0x5831, 0x9a30, 0xdc32, 0x1e33,
0x6024, 0xa225, 0xe427, 0x2626, 0x6823, 0xaa22, 0xec20, 0x2e21,
0x702a, 0xb22b, 0xf429, 0x3628, 0x782d, 0xba2c, 0xfc2e, 0x3e2f,
0x8070, 0x4271, 0x0473, 0xc672, 0x8877, 0x4a76, 0x0c74, 0xce75,
0x907e, 0x527f, 0x147d, 0xd67c, 0x9879, 0x5a78, 0x1c7a, 0xde7b,
0xa06c, 0x626d, 0x246f, 0xe66e, 0xa86b, 0x6a6a, 0x2c68, 0xee69,
0xb062, 0x7263, 0x3461, 0xf660, 0xb865, 0x7a64, 0x3c66, 0xfe67,
0xc048, 0x0249, 0x444b, 0x864a, 0xc84f, 0x0a4e, 0x4c4c, 0x8e4d,
0xd046, 0x1247, 0x5445, 0x9644, 0xd841, 0x1a40, 0x5c42, 0x9e43,
0xe054, 0x2255, 0x6457, 0xa656, 0xe853, 0x2a52, 0x6c50, 0xae51,
0xf05a, 0x325b, 0x7459, 0xb658, 0xf85d, 0x3a5c, 0x7c5e, 0xbe5f,
0x00e1, 0xc2e0, 0x84e2, 0x46e3, 0x08e6, 0xcae7, 0x8ce5, 0x4ee4,
0x10ef, 0xd2ee, 0x94ec, 0x56ed, 0x18e8, 0xdae9, 0x9ceb, 0x5eea,
0x20fd, 0xe2fc, 0xa4fe, 0x66ff, 0x28fa, 0xeafb, 0xacf9, 0x6ef8,
0x30f3, 0xf2f2, 0xb4f0, 0x76f1, 0x38f4, 0xfaf5, 0xbcf7, 0x7ef6,
0x40d9, 0x82d8, 0xc4da, 0x06db, 0x48de, 0x8adf, 0xccdd, 0x0edc,
0x50d7, 0x92d6, 0xd4d4, 0x16d5, 0x58d0, 0x9ad1, 0xdcd3, 0x1ed2,
0x60c5, 0xa2c4, 0xe4c6, 0x26c7, 0x68c2, 0xaac3, 0xecc1, 0x2ec0,
0x70cb, 0xb2ca, 0xf4c8, 0x36c9, 0x78cc, 0xbacd, 0xfccf, 0x3ece,
0x8091, 0x4290, 0x0492, 0xc693, 0x8896, 0x4a97, 0x0c95, 0xce94,
0x909f, 0x529e, 0x149c, 0xd69d, 0x9898, 0x5a99, 0x1c9b, 0xde9a,
0xa08d, 0x628c, 0x248e, 0xe68f, 0xa88a, 0x6a8b, 0x2c89, 0xee88,
0xb083, 0x7282, 0x3480, 0xf681, 0xb884, 0x7a85, 0x3c87, 0xfe86,
0xc0a9, 0x02a8, 0x44aa, 0x86ab, 0xc8ae, 0x0aaf, 0x4cad, 0x8eac,
0xd0a7, 0x12a6, 0x54a4, 0x96a5, 0xd8a0, 0x1aa1, 0x5ca3, 0x9ea2,
0xe0b5, 0x22b4, 0x64b6, 0xa6b7, 0xe8b2, 0x2ab3, 0x6cb1, 0xaeb0,
0xf0bb, 0x32ba, 0x74b8, 0xb6b9, 0xf8bc, 0x3abd, 0x7cbf, 0xbebe
};
static void gcm_mult_largetable(uint8_t *output, const uint8_t *x, uint64_t H[256][2])
{
int i;
uint64_t u64z[2];
uint16_t *u16z = (uint16_t *) u64z;
uint8_t *u8z = (uint8_t *) u64z;
uint8_t rem;
u64z[0] = 0;
u64z[1] = 0;
if (MBEDTLS_IS_BIG_ENDIAN) {
for (i = 15; i > 0; i--) {
mbedtls_xor_no_simd(u8z, u8z, (uint8_t *) H[x[i]], 16);
rem = u8z[15];
u64z[1] >>= 8;
u8z[8] = u8z[7];
u64z[0] >>= 8;
u16z[0] ^= MBEDTLS_GET_UINT16_LE(&last8[rem], 0);
}
} else {
for (i = 15; i > 0; i--) {
mbedtls_xor_no_simd(u8z, u8z, (uint8_t *) H[x[i]], 16);
rem = u8z[15];
u64z[1] <<= 8;
u8z[8] = u8z[7];
u64z[0] <<= 8;
u16z[0] ^= last8[rem];
}
}
mbedtls_xor_no_simd(output, u8z, (uint8_t *) H[x[0]], 16);
}
#else
/*
* Shoup's method for multiplication use this table with
* last4[x] = x times P^128
* where x and last4[x] are seen as elements of GF(2^128) as in [MGV]
*/
static const uint16_t last4[16] =
{
0x0000, 0x1c20, 0x3840, 0x2460,
0x7080, 0x6ca0, 0x48c0, 0x54e0,
0xe100, 0xfd20, 0xd940, 0xc560,
0x9180, 0x8da0, 0xa9c0, 0xb5e0
};
static void gcm_mult_smalltable(uint8_t *output, const uint8_t *x, uint64_t H[16][2])
{
int i = 0;
unsigned char lo, hi, rem;
uint64_t u64z[2];
const uint64_t *pu64z = NULL;
uint8_t *u8z = (uint8_t *) u64z;
lo = x[15] & 0xf;
hi = (x[15] >> 4) & 0xf;
pu64z = H[lo];
rem = (unsigned char) pu64z[1] & 0xf;
u64z[1] = (pu64z[0] << 60) | (pu64z[1] >> 4);
u64z[0] = (pu64z[0] >> 4);
u64z[0] ^= (uint64_t) last4[rem] << 48;
mbedtls_xor_no_simd(u8z, u8z, (uint8_t *) H[hi], 16);
for (i = 14; i >= 0; i--) {
lo = x[i] & 0xf;
hi = (x[i] >> 4) & 0xf;
rem = (unsigned char) u64z[1] & 0xf;
u64z[1] = (u64z[0] << 60) | (u64z[1] >> 4);
u64z[0] = (u64z[0] >> 4);
u64z[0] ^= (uint64_t) last4[rem] << 48;
mbedtls_xor_no_simd(u8z, u8z, (uint8_t *) H[lo], 16);
rem = (unsigned char) u64z[1] & 0xf;
u64z[1] = (u64z[0] << 60) | (u64z[1] >> 4);
u64z[0] = (u64z[0] >> 4);
u64z[0] ^= (uint64_t) last4[rem] << 48;
mbedtls_xor_no_simd(u8z, u8z, (uint8_t *) H[hi], 16);
}
MBEDTLS_PUT_UINT64_BE(u64z[0], output, 0);
MBEDTLS_PUT_UINT64_BE(u64z[1], output, 8);
}
#endif
/*
* Sets output to x times H using the precomputed tables.
* x and output are seen as elements of GF(2^128) as in [MGV].
*/
static void gcm_mult(mbedtls_gcm_context *ctx, const unsigned char x[16],
unsigned char output[16])
{
switch (ctx->acceleration) {
#if defined(MBEDTLS_AESNI_HAVE_CODE)
case MBEDTLS_GCM_ACC_AESNI:
mbedtls_aesni_gcm_mult(output, x, (uint8_t *) ctx->H[MBEDTLS_GCM_HTABLE_SIZE/2]);
break;
#endif
#if defined(MBEDTLS_AESCE_HAVE_CODE)
case MBEDTLS_GCM_ACC_AESCE:
mbedtls_aesce_gcm_mult(output, x, (uint8_t *) ctx->H[MBEDTLS_GCM_HTABLE_SIZE/2]);
break;
#endif
#if defined(MBEDTLS_GCM_LARGE_TABLE)
case MBEDTLS_GCM_ACC_LARGETABLE:
gcm_mult_largetable(output, x, ctx->H);
break;
#else
case MBEDTLS_GCM_ACC_SMALLTABLE:
gcm_mult_smalltable(output, x, ctx->H);
break;
#endif
}
return;
}
int mbedtls_gcm_starts(mbedtls_gcm_context *ctx,
int mode,
const unsigned char *iv, size_t iv_len)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
unsigned char work_buf[16];
const unsigned char *p;
size_t use_len;
uint64_t iv_bits;
#if !defined(MBEDTLS_BLOCK_CIPHER_C)
size_t olen = 0;
#endif
/* IV is limited to 2^64 bits, so 2^61 bytes */
/* IV is not allowed to be zero length */
if (iv_len == 0 || (uint64_t) iv_len >> 61 != 0) {
return MBEDTLS_ERR_GCM_BAD_INPUT;
}
memset(ctx->y, 0x00, sizeof(ctx->y));
memset(ctx->buf, 0x00, sizeof(ctx->buf));
ctx->mode = mode;
ctx->len = 0;
ctx->add_len = 0;
if (iv_len == 12) {
memcpy(ctx->y, iv, iv_len);
ctx->y[15] = 1;
} else {
memset(work_buf, 0x00, 16);
iv_bits = (uint64_t) iv_len * 8;
MBEDTLS_PUT_UINT64_BE(iv_bits, work_buf, 8);
p = iv;
while (iv_len > 0) {
use_len = (iv_len < 16) ? iv_len : 16;
#if defined(MBEDTLS_COMPILER_IS_GCC) && (MBEDTLS_GCC_VERSION >= 70110)
#pragma GCC diagnostic push
#pragma GCC diagnostic warning "-Wstringop-overflow=0"
#endif
mbedtls_xor(ctx->y, ctx->y, p, use_len);
#if defined(MBEDTLS_COMPILER_IS_GCC) && (MBEDTLS_GCC_VERSION >= 70110)
#pragma GCC diagnostic pop
#endif
gcm_mult(ctx, ctx->y, ctx->y);
iv_len -= use_len;
p += use_len;
}
mbedtls_xor(ctx->y, ctx->y, work_buf, 16);
gcm_mult(ctx, ctx->y, ctx->y);
}
#if defined(MBEDTLS_BLOCK_CIPHER_C)
ret = mbedtls_block_cipher_encrypt(&ctx->block_cipher_ctx, ctx->y, ctx->base_ectr);
#else
ret = mbedtls_cipher_update(&ctx->cipher_ctx, ctx->y, 16, ctx->base_ectr, &olen);
#endif
if (ret != 0) {
return ret;
}
return 0;
}
/**
* mbedtls_gcm_context::buf contains the partial state of the computation of
* the authentication tag.
* mbedtls_gcm_context::add_len and mbedtls_gcm_context::len indicate
* different stages of the computation:
* * len == 0 && add_len == 0: initial state
* * len == 0 && add_len % 16 != 0: the first `add_len % 16` bytes have
* a partial block of AD that has been
* xored in but not yet multiplied in.
* * len == 0 && add_len % 16 == 0: the authentication tag is correct if
* the data ends now.
* * len % 16 != 0: the first `len % 16` bytes have
* a partial block of ciphertext that has
* been xored in but not yet multiplied in.
* * len > 0 && len % 16 == 0: the authentication tag is correct if
* the data ends now.
*/
int mbedtls_gcm_update_ad(mbedtls_gcm_context *ctx,
const unsigned char *add, size_t add_len)
{
const unsigned char *p;
size_t use_len, offset;
uint64_t new_add_len;
/* AD is limited to 2^64 bits, ie 2^61 bytes
* Also check for possible overflow */
#if SIZE_MAX > 0xFFFFFFFFFFFFFFFFULL
if (add_len > 0xFFFFFFFFFFFFFFFFULL) {
return MBEDTLS_ERR_GCM_BAD_INPUT;
}
#endif
new_add_len = ctx->add_len + (uint64_t) add_len;
if (new_add_len < ctx->add_len || new_add_len >> 61 != 0) {
return MBEDTLS_ERR_GCM_BAD_INPUT;
}
offset = ctx->add_len % 16;
p = add;
if (offset != 0) {
use_len = 16 - offset;
if (use_len > add_len) {
use_len = add_len;
}
mbedtls_xor(ctx->buf + offset, ctx->buf + offset, p, use_len);
if (offset + use_len == 16) {
gcm_mult(ctx, ctx->buf, ctx->buf);
}
ctx->add_len += use_len;
add_len -= use_len;
p += use_len;
}
ctx->add_len += add_len;
while (add_len >= 16) {
mbedtls_xor(ctx->buf, ctx->buf, p, 16);
gcm_mult(ctx, ctx->buf, ctx->buf);
add_len -= 16;
p += 16;
}
if (add_len > 0) {
mbedtls_xor(ctx->buf, ctx->buf, p, add_len);
}
return 0;
}
/* Increment the counter. */
static void gcm_incr(unsigned char y[16])
{
uint32_t x = MBEDTLS_GET_UINT32_BE(y, 12);
x++;
MBEDTLS_PUT_UINT32_BE(x, y, 12);
}
/* Calculate and apply the encryption mask. Process use_len bytes of data,
* starting at position offset in the mask block. */
static int gcm_mask(mbedtls_gcm_context *ctx,
unsigned char ectr[16],
size_t offset, size_t use_len,
const unsigned char *input,
unsigned char *output)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
#if defined(MBEDTLS_BLOCK_CIPHER_C)
ret = mbedtls_block_cipher_encrypt(&ctx->block_cipher_ctx, ctx->y, ectr);
#else
size_t olen = 0;
ret = mbedtls_cipher_update(&ctx->cipher_ctx, ctx->y, 16, ectr, &olen);
#endif
if (ret != 0) {
mbedtls_platform_zeroize(ectr, 16);
return ret;
}
if (ctx->mode == MBEDTLS_GCM_DECRYPT) {
mbedtls_xor(ctx->buf + offset, ctx->buf + offset, input, use_len);
}
mbedtls_xor(output, ectr + offset, input, use_len);
if (ctx->mode == MBEDTLS_GCM_ENCRYPT) {
mbedtls_xor(ctx->buf + offset, ctx->buf + offset, output, use_len);
}
return 0;
}
int mbedtls_gcm_update(mbedtls_gcm_context *ctx,
const unsigned char *input, size_t input_length,
unsigned char *output, size_t output_size,
size_t *output_length)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
const unsigned char *p = input;
unsigned char *out_p = output;
size_t offset;
unsigned char ectr[16] = { 0 };
if (output_size < input_length) {
return MBEDTLS_ERR_GCM_BUFFER_TOO_SMALL;
}
*output_length = input_length;
/* Exit early if input_length==0 so that we don't do any pointer arithmetic
* on a potentially null pointer.
* Returning early also means that the last partial block of AD remains
* untouched for mbedtls_gcm_finish */
if (input_length == 0) {
return 0;
}
if (output > input && (size_t) (output - input) < input_length) {
return MBEDTLS_ERR_GCM_BAD_INPUT;
}
/* Total length is restricted to 2^39 - 256 bits, ie 2^36 - 2^5 bytes
* Also check for possible overflow */
if (ctx->len + input_length < ctx->len ||
(uint64_t) ctx->len + input_length > 0xFFFFFFFE0ull) {
return MBEDTLS_ERR_GCM_BAD_INPUT;
}
if (ctx->len == 0 && ctx->add_len % 16 != 0) {
gcm_mult(ctx, ctx->buf, ctx->buf);
}
offset = ctx->len % 16;
if (offset != 0) {
size_t use_len = 16 - offset;
if (use_len > input_length) {
use_len = input_length;
}
if ((ret = gcm_mask(ctx, ectr, offset, use_len, p, out_p)) != 0) {
return ret;
}
if (offset + use_len == 16) {
gcm_mult(ctx, ctx->buf, ctx->buf);
}
ctx->len += use_len;
input_length -= use_len;
p += use_len;
out_p += use_len;
}
ctx->len += input_length;
while (input_length >= 16) {
gcm_incr(ctx->y);
if ((ret = gcm_mask(ctx, ectr, 0, 16, p, out_p)) != 0) {
return ret;
}
gcm_mult(ctx, ctx->buf, ctx->buf);
input_length -= 16;
p += 16;
out_p += 16;
}
if (input_length > 0) {
gcm_incr(ctx->y);
if ((ret = gcm_mask(ctx, ectr, 0, input_length, p, out_p)) != 0) {
return ret;
}
}
mbedtls_platform_zeroize(ectr, sizeof(ectr));
return 0;
}
int mbedtls_gcm_finish(mbedtls_gcm_context *ctx,
unsigned char *output, size_t output_size,
size_t *output_length,
unsigned char *tag, size_t tag_len)
{
unsigned char work_buf[16];
uint64_t orig_len;
uint64_t orig_add_len;
/* We never pass any output in finish(). The output parameter exists only
* for the sake of alternative implementations. */
(void) output;
(void) output_size;
*output_length = 0;
/* Total length is restricted to 2^39 - 256 bits, ie 2^36 - 2^5 bytes
* and AD length is restricted to 2^64 bits, ie 2^61 bytes so neither of
* the two multiplications would overflow. */
orig_len = ctx->len * 8;
orig_add_len = ctx->add_len * 8;
if (ctx->len == 0 && ctx->add_len % 16 != 0) {
gcm_mult(ctx, ctx->buf, ctx->buf);
}
if (tag_len > 16 || tag_len < 4) {
return MBEDTLS_ERR_GCM_BAD_INPUT;
}
if (ctx->len % 16 != 0) {
gcm_mult(ctx, ctx->buf, ctx->buf);
}
memcpy(tag, ctx->base_ectr, tag_len);
if (orig_len || orig_add_len) {
memset(work_buf, 0x00, 16);
MBEDTLS_PUT_UINT32_BE((orig_add_len >> 32), work_buf, 0);
MBEDTLS_PUT_UINT32_BE((orig_add_len), work_buf, 4);
MBEDTLS_PUT_UINT32_BE((orig_len >> 32), work_buf, 8);
MBEDTLS_PUT_UINT32_BE((orig_len), work_buf, 12);
mbedtls_xor(ctx->buf, ctx->buf, work_buf, 16);
gcm_mult(ctx, ctx->buf, ctx->buf);
mbedtls_xor(tag, tag, ctx->buf, tag_len);
}
return 0;
}
int mbedtls_gcm_crypt_and_tag(mbedtls_gcm_context *ctx,
int mode,
size_t length,
const unsigned char *iv,
size_t iv_len,
const unsigned char *add,
size_t add_len,
const unsigned char *input,
unsigned char *output,
size_t tag_len,
unsigned char *tag)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t olen;
if ((ret = mbedtls_gcm_starts(ctx, mode, iv, iv_len)) != 0) {
return ret;
}
if ((ret = mbedtls_gcm_update_ad(ctx, add, add_len)) != 0) {
return ret;
}
if ((ret = mbedtls_gcm_update(ctx, input, length,
output, length, &olen)) != 0) {
return ret;
}
if ((ret = mbedtls_gcm_finish(ctx, NULL, 0, &olen, tag, tag_len)) != 0) {
return ret;
}
return 0;
}
int mbedtls_gcm_auth_decrypt(mbedtls_gcm_context *ctx,
size_t length,
const unsigned char *iv,
size_t iv_len,
const unsigned char *add,
size_t add_len,
const unsigned char *tag,
size_t tag_len,
const unsigned char *input,
unsigned char *output)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
unsigned char check_tag[16];
int diff;
if ((ret = mbedtls_gcm_crypt_and_tag(ctx, MBEDTLS_GCM_DECRYPT, length,
iv, iv_len, add, add_len,
input, output, tag_len, check_tag)) != 0) {
return ret;
}
/* Check tag in "constant-time" */
diff = mbedtls_ct_memcmp(tag, check_tag, tag_len);
if (diff != 0) {
mbedtls_platform_zeroize(output, length);
return MBEDTLS_ERR_GCM_AUTH_FAILED;
}
return 0;
}
void mbedtls_gcm_free(mbedtls_gcm_context *ctx)
{
if (ctx == NULL) {
return;
}
#if defined(MBEDTLS_BLOCK_CIPHER_C)
mbedtls_block_cipher_free(&ctx->block_cipher_ctx);
#else
mbedtls_cipher_free(&ctx->cipher_ctx);
#endif
mbedtls_platform_zeroize(ctx, sizeof(mbedtls_gcm_context));
}
#endif /* !defined(MBEDTLS_GCM_ALT) || defined(MBEDTLS_GCM_NON_AES_CIPHER_SOFT_FALLBACK) */
#if defined(MBEDTLS_SELF_TEST) && defined(MBEDTLS_CCM_GCM_CAN_AES)
/*
* AES-GCM test vectors from:
*
* http://csrc.nist.gov/groups/STM/cavp/documents/mac/gcmtestvectors.zip
*/
#define MAX_TESTS 6
static const int key_index_test_data[MAX_TESTS] =
{ 0, 0, 1, 1, 1, 1 };
static const unsigned char key_test_data[][32] =
{
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0xfe, 0xff, 0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c,
0x6d, 0x6a, 0x8f, 0x94, 0x67, 0x30, 0x83, 0x08,
0xfe, 0xff, 0xe9, 0x92, 0x86, 0x65, 0x73, 0x1c,
0x6d, 0x6a, 0x8f, 0x94, 0x67, 0x30, 0x83, 0x08 },
};
static const size_t iv_len_test_data[MAX_TESTS] =
{ 12, 12, 12, 12, 8, 60 };
static const int iv_index_test_data[MAX_TESTS] =
{ 0, 0, 1, 1, 1, 2 };
static const unsigned char iv_test_data[][64] =
{
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00 },
{ 0xca, 0xfe, 0xba, 0xbe, 0xfa, 0xce, 0xdb, 0xad,
0xde, 0xca, 0xf8, 0x88 },
{ 0x93, 0x13, 0x22, 0x5d, 0xf8, 0x84, 0x06, 0xe5,
0x55, 0x90, 0x9c, 0x5a, 0xff, 0x52, 0x69, 0xaa,
0x6a, 0x7a, 0x95, 0x38, 0x53, 0x4f, 0x7d, 0xa1,
0xe4, 0xc3, 0x03, 0xd2, 0xa3, 0x18, 0xa7, 0x28,
0xc3, 0xc0, 0xc9, 0x51, 0x56, 0x80, 0x95, 0x39,
0xfc, 0xf0, 0xe2, 0x42, 0x9a, 0x6b, 0x52, 0x54,
0x16, 0xae, 0xdb, 0xf5, 0xa0, 0xde, 0x6a, 0x57,
0xa6, 0x37, 0xb3, 0x9b },
};
static const size_t add_len_test_data[MAX_TESTS] =
{ 0, 0, 0, 20, 20, 20 };
static const int add_index_test_data[MAX_TESTS] =
{ 0, 0, 0, 1, 1, 1 };
static const unsigned char additional_test_data[][64] =
{
{ 0x00 },
{ 0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef,
0xfe, 0xed, 0xfa, 0xce, 0xde, 0xad, 0xbe, 0xef,
0xab, 0xad, 0xda, 0xd2 },
};
static const size_t pt_len_test_data[MAX_TESTS] =
{ 0, 16, 64, 60, 60, 60 };
static const int pt_index_test_data[MAX_TESTS] =
{ 0, 0, 1, 1, 1, 1 };
static const unsigned char pt_test_data[][64] =
{
{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
{ 0xd9, 0x31, 0x32, 0x25, 0xf8, 0x84, 0x06, 0xe5,
0xa5, 0x59, 0x09, 0xc5, 0xaf, 0xf5, 0x26, 0x9a,
0x86, 0xa7, 0xa9, 0x53, 0x15, 0x34, 0xf7, 0xda,
0x2e, 0x4c, 0x30, 0x3d, 0x8a, 0x31, 0x8a, 0x72,
0x1c, 0x3c, 0x0c, 0x95, 0x95, 0x68, 0x09, 0x53,
0x2f, 0xcf, 0x0e, 0x24, 0x49, 0xa6, 0xb5, 0x25,
0xb1, 0x6a, 0xed, 0xf5, 0xaa, 0x0d, 0xe6, 0x57,
0xba, 0x63, 0x7b, 0x39, 0x1a, 0xaf, 0xd2, 0x55 },
};
static const unsigned char ct_test_data[][64] =
{
{ 0x00 },
{ 0x03, 0x88, 0xda, 0xce, 0x60, 0xb6, 0xa3, 0x92,
0xf3, 0x28, 0xc2, 0xb9, 0x71, 0xb2, 0xfe, 0x78 },
{ 0x42, 0x83, 0x1e, 0xc2, 0x21, 0x77, 0x74, 0x24,
0x4b, 0x72, 0x21, 0xb7, 0x84, 0xd0, 0xd4, 0x9c,
0xe3, 0xaa, 0x21, 0x2f, 0x2c, 0x02, 0xa4, 0xe0,
0x35, 0xc1, 0x7e, 0x23, 0x29, 0xac, 0xa1, 0x2e,
0x21, 0xd5, 0x14, 0xb2, 0x54, 0x66, 0x93, 0x1c,
0x7d, 0x8f, 0x6a, 0x5a, 0xac, 0x84, 0xaa, 0x05,
0x1b, 0xa3, 0x0b, 0x39, 0x6a, 0x0a, 0xac, 0x97,
0x3d, 0x58, 0xe0, 0x91, 0x47, 0x3f, 0x59, 0x85 },
{ 0x42, 0x83, 0x1e, 0xc2, 0x21, 0x77, 0x74, 0x24,
0x4b, 0x72, 0x21, 0xb7, 0x84, 0xd0, 0xd4, 0x9c,
0xe3, 0xaa, 0x21, 0x2f, 0x2c, 0x02, 0xa4, 0xe0,
0x35, 0xc1, 0x7e, 0x23, 0x29, 0xac, 0xa1, 0x2e,
0x21, 0xd5, 0x14, 0xb2, 0x54, 0x66, 0x93, 0x1c,
0x7d, 0x8f, 0x6a, 0x5a, 0xac, 0x84, 0xaa, 0x05,
0x1b, 0xa3, 0x0b, 0x39, 0x6a, 0x0a, 0xac, 0x97,
0x3d, 0x58, 0xe0, 0x91 },
{ 0x61, 0x35, 0x3b, 0x4c, 0x28, 0x06, 0x93, 0x4a,
0x77, 0x7f, 0xf5, 0x1f, 0xa2, 0x2a, 0x47, 0x55,
0x69, 0x9b, 0x2a, 0x71, 0x4f, 0xcd, 0xc6, 0xf8,
0x37, 0x66, 0xe5, 0xf9, 0x7b, 0x6c, 0x74, 0x23,
0x73, 0x80, 0x69, 0x00, 0xe4, 0x9f, 0x24, 0xb2,
0x2b, 0x09, 0x75, 0x44, 0xd4, 0x89, 0x6b, 0x42,
0x49, 0x89, 0xb5, 0xe1, 0xeb, 0xac, 0x0f, 0x07,
0xc2, 0x3f, 0x45, 0x98 },
{ 0x8c, 0xe2, 0x49, 0x98, 0x62, 0x56, 0x15, 0xb6,
0x03, 0xa0, 0x33, 0xac, 0xa1, 0x3f, 0xb8, 0x94,
0xbe, 0x91, 0x12, 0xa5, 0xc3, 0xa2, 0x11, 0xa8,
0xba, 0x26, 0x2a, 0x3c, 0xca, 0x7e, 0x2c, 0xa7,
0x01, 0xe4, 0xa9, 0xa4, 0xfb, 0xa4, 0x3c, 0x90,
0xcc, 0xdc, 0xb2, 0x81, 0xd4, 0x8c, 0x7c, 0x6f,
0xd6, 0x28, 0x75, 0xd2, 0xac, 0xa4, 0x17, 0x03,
0x4c, 0x34, 0xae, 0xe5 },
#if !defined(MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH)
{ 0x00 },
{ 0x98, 0xe7, 0x24, 0x7c, 0x07, 0xf0, 0xfe, 0x41,
0x1c, 0x26, 0x7e, 0x43, 0x84, 0xb0, 0xf6, 0x00 },
{ 0x39, 0x80, 0xca, 0x0b, 0x3c, 0x00, 0xe8, 0x41,
0xeb, 0x06, 0xfa, 0xc4, 0x87, 0x2a, 0x27, 0x57,
0x85, 0x9e, 0x1c, 0xea, 0xa6, 0xef, 0xd9, 0x84,
0x62, 0x85, 0x93, 0xb4, 0x0c, 0xa1, 0xe1, 0x9c,
0x7d, 0x77, 0x3d, 0x00, 0xc1, 0x44, 0xc5, 0x25,
0xac, 0x61, 0x9d, 0x18, 0xc8, 0x4a, 0x3f, 0x47,
0x18, 0xe2, 0x44, 0x8b, 0x2f, 0xe3, 0x24, 0xd9,
0xcc, 0xda, 0x27, 0x10, 0xac, 0xad, 0xe2, 0x56 },
{ 0x39, 0x80, 0xca, 0x0b, 0x3c, 0x00, 0xe8, 0x41,
0xeb, 0x06, 0xfa, 0xc4, 0x87, 0x2a, 0x27, 0x57,
0x85, 0x9e, 0x1c, 0xea, 0xa6, 0xef, 0xd9, 0x84,
0x62, 0x85, 0x93, 0xb4, 0x0c, 0xa1, 0xe1, 0x9c,
0x7d, 0x77, 0x3d, 0x00, 0xc1, 0x44, 0xc5, 0x25,
0xac, 0x61, 0x9d, 0x18, 0xc8, 0x4a, 0x3f, 0x47,
0x18, 0xe2, 0x44, 0x8b, 0x2f, 0xe3, 0x24, 0xd9,
0xcc, 0xda, 0x27, 0x10 },
{ 0x0f, 0x10, 0xf5, 0x99, 0xae, 0x14, 0xa1, 0x54,
0xed, 0x24, 0xb3, 0x6e, 0x25, 0x32, 0x4d, 0xb8,
0xc5, 0x66, 0x63, 0x2e, 0xf2, 0xbb, 0xb3, 0x4f,
0x83, 0x47, 0x28, 0x0f, 0xc4, 0x50, 0x70, 0x57,
0xfd, 0xdc, 0x29, 0xdf, 0x9a, 0x47, 0x1f, 0x75,
0xc6, 0x65, 0x41, 0xd4, 0xd4, 0xda, 0xd1, 0xc9,
0xe9, 0x3a, 0x19, 0xa5, 0x8e, 0x8b, 0x47, 0x3f,
0xa0, 0xf0, 0x62, 0xf7 },
{ 0xd2, 0x7e, 0x88, 0x68, 0x1c, 0xe3, 0x24, 0x3c,
0x48, 0x30, 0x16, 0x5a, 0x8f, 0xdc, 0xf9, 0xff,
0x1d, 0xe9, 0xa1, 0xd8, 0xe6, 0xb4, 0x47, 0xef,
0x6e, 0xf7, 0xb7, 0x98, 0x28, 0x66, 0x6e, 0x45,
0x81, 0xe7, 0x90, 0x12, 0xaf, 0x34, 0xdd, 0xd9,
0xe2, 0xf0, 0x37, 0x58, 0x9b, 0x29, 0x2d, 0xb3,
0xe6, 0x7c, 0x03, 0x67, 0x45, 0xfa, 0x22, 0xe7,
0xe9, 0xb7, 0x37, 0x3b },
{ 0x00 },
{ 0xce, 0xa7, 0x40, 0x3d, 0x4d, 0x60, 0x6b, 0x6e,
0x07, 0x4e, 0xc5, 0xd3, 0xba, 0xf3, 0x9d, 0x18 },
{ 0x52, 0x2d, 0xc1, 0xf0, 0x99, 0x56, 0x7d, 0x07,
0xf4, 0x7f, 0x37, 0xa3, 0x2a, 0x84, 0x42, 0x7d,
0x64, 0x3a, 0x8c, 0xdc, 0xbf, 0xe5, 0xc0, 0xc9,
0x75, 0x98, 0xa2, 0xbd, 0x25, 0x55, 0xd1, 0xaa,
0x8c, 0xb0, 0x8e, 0x48, 0x59, 0x0d, 0xbb, 0x3d,
0xa7, 0xb0, 0x8b, 0x10, 0x56, 0x82, 0x88, 0x38,
0xc5, 0xf6, 0x1e, 0x63, 0x93, 0xba, 0x7a, 0x0a,
0xbc, 0xc9, 0xf6, 0x62, 0x89, 0x80, 0x15, 0xad },
{ 0x52, 0x2d, 0xc1, 0xf0, 0x99, 0x56, 0x7d, 0x07,
0xf4, 0x7f, 0x37, 0xa3, 0x2a, 0x84, 0x42, 0x7d,
0x64, 0x3a, 0x8c, 0xdc, 0xbf, 0xe5, 0xc0, 0xc9,
0x75, 0x98, 0xa2, 0xbd, 0x25, 0x55, 0xd1, 0xaa,
0x8c, 0xb0, 0x8e, 0x48, 0x59, 0x0d, 0xbb, 0x3d,
0xa7, 0xb0, 0x8b, 0x10, 0x56, 0x82, 0x88, 0x38,
0xc5, 0xf6, 0x1e, 0x63, 0x93, 0xba, 0x7a, 0x0a,
0xbc, 0xc9, 0xf6, 0x62 },
{ 0xc3, 0x76, 0x2d, 0xf1, 0xca, 0x78, 0x7d, 0x32,
0xae, 0x47, 0xc1, 0x3b, 0xf1, 0x98, 0x44, 0xcb,
0xaf, 0x1a, 0xe1, 0x4d, 0x0b, 0x97, 0x6a, 0xfa,
0xc5, 0x2f, 0xf7, 0xd7, 0x9b, 0xba, 0x9d, 0xe0,
0xfe, 0xb5, 0x82, 0xd3, 0x39, 0x34, 0xa4, 0xf0,
0x95, 0x4c, 0xc2, 0x36, 0x3b, 0xc7, 0x3f, 0x78,
0x62, 0xac, 0x43, 0x0e, 0x64, 0xab, 0xe4, 0x99,
0xf4, 0x7c, 0x9b, 0x1f },
{ 0x5a, 0x8d, 0xef, 0x2f, 0x0c, 0x9e, 0x53, 0xf1,
0xf7, 0x5d, 0x78, 0x53, 0x65, 0x9e, 0x2a, 0x20,
0xee, 0xb2, 0xb2, 0x2a, 0xaf, 0xde, 0x64, 0x19,
0xa0, 0x58, 0xab, 0x4f, 0x6f, 0x74, 0x6b, 0xf4,
0x0f, 0xc0, 0xc3, 0xb7, 0x80, 0xf2, 0x44, 0x45,
0x2d, 0xa3, 0xeb, 0xf1, 0xc5, 0xd8, 0x2c, 0xde,
0xa2, 0x41, 0x89, 0x97, 0x20, 0x0e, 0xf8, 0x2e,
0x44, 0xae, 0x7e, 0x3f },
#endif /* !MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH */
};
static const unsigned char tag_test_data[][16] =
{
{ 0x58, 0xe2, 0xfc, 0xce, 0xfa, 0x7e, 0x30, 0x61,
0x36, 0x7f, 0x1d, 0x57, 0xa4, 0xe7, 0x45, 0x5a },
{ 0xab, 0x6e, 0x47, 0xd4, 0x2c, 0xec, 0x13, 0xbd,
0xf5, 0x3a, 0x67, 0xb2, 0x12, 0x57, 0xbd, 0xdf },
{ 0x4d, 0x5c, 0x2a, 0xf3, 0x27, 0xcd, 0x64, 0xa6,
0x2c, 0xf3, 0x5a, 0xbd, 0x2b, 0xa6, 0xfa, 0xb4 },
{ 0x5b, 0xc9, 0x4f, 0xbc, 0x32, 0x21, 0xa5, 0xdb,
0x94, 0xfa, 0xe9, 0x5a, 0xe7, 0x12, 0x1a, 0x47 },
{ 0x36, 0x12, 0xd2, 0xe7, 0x9e, 0x3b, 0x07, 0x85,
0x56, 0x1b, 0xe1, 0x4a, 0xac, 0xa2, 0xfc, 0xcb },
{ 0x61, 0x9c, 0xc5, 0xae, 0xff, 0xfe, 0x0b, 0xfa,
0x46, 0x2a, 0xf4, 0x3c, 0x16, 0x99, 0xd0, 0x50 },
#if !defined(MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH)
{ 0xcd, 0x33, 0xb2, 0x8a, 0xc7, 0x73, 0xf7, 0x4b,
0xa0, 0x0e, 0xd1, 0xf3, 0x12, 0x57, 0x24, 0x35 },
{ 0x2f, 0xf5, 0x8d, 0x80, 0x03, 0x39, 0x27, 0xab,
0x8e, 0xf4, 0xd4, 0x58, 0x75, 0x14, 0xf0, 0xfb },
{ 0x99, 0x24, 0xa7, 0xc8, 0x58, 0x73, 0x36, 0xbf,
0xb1, 0x18, 0x02, 0x4d, 0xb8, 0x67, 0x4a, 0x14 },
{ 0x25, 0x19, 0x49, 0x8e, 0x80, 0xf1, 0x47, 0x8f,
0x37, 0xba, 0x55, 0xbd, 0x6d, 0x27, 0x61, 0x8c },
{ 0x65, 0xdc, 0xc5, 0x7f, 0xcf, 0x62, 0x3a, 0x24,
0x09, 0x4f, 0xcc, 0xa4, 0x0d, 0x35, 0x33, 0xf8 },
{ 0xdc, 0xf5, 0x66, 0xff, 0x29, 0x1c, 0x25, 0xbb,
0xb8, 0x56, 0x8f, 0xc3, 0xd3, 0x76, 0xa6, 0xd9 },
{ 0x53, 0x0f, 0x8a, 0xfb, 0xc7, 0x45, 0x36, 0xb9,
0xa9, 0x63, 0xb4, 0xf1, 0xc4, 0xcb, 0x73, 0x8b },
{ 0xd0, 0xd1, 0xc8, 0xa7, 0x99, 0x99, 0x6b, 0xf0,
0x26, 0x5b, 0x98, 0xb5, 0xd4, 0x8a, 0xb9, 0x19 },
{ 0xb0, 0x94, 0xda, 0xc5, 0xd9, 0x34, 0x71, 0xbd,
0xec, 0x1a, 0x50, 0x22, 0x70, 0xe3, 0xcc, 0x6c },
{ 0x76, 0xfc, 0x6e, 0xce, 0x0f, 0x4e, 0x17, 0x68,
0xcd, 0xdf, 0x88, 0x53, 0xbb, 0x2d, 0x55, 0x1b },
{ 0x3a, 0x33, 0x7d, 0xbf, 0x46, 0xa7, 0x92, 0xc4,
0x5e, 0x45, 0x49, 0x13, 0xfe, 0x2e, 0xa8, 0xf2 },
{ 0xa4, 0x4a, 0x82, 0x66, 0xee, 0x1c, 0x8e, 0xb0,
0xc8, 0xb5, 0xd4, 0xcf, 0x5a, 0xe9, 0xf1, 0x9a },
#endif /* !MBEDTLS_AES_ONLY_128_BIT_KEY_LENGTH */
};
int mbedtls_gcm_self_test(int verbose)
{
mbedtls_gcm_context ctx;
unsigned char buf[64];
unsigned char tag_buf[16];
int i, j, ret;
mbedtls_cipher_id_t cipher = MBEDTLS_CIPHER_ID_AES;
size_t olen;
if (verbose != 0) {
#if defined(MBEDTLS_GCM_ALT)
mbedtls_printf(" GCM note: alternative implementation.\n");
#else /* MBEDTLS_GCM_ALT */
#if defined(MBEDTLS_AESNI_HAVE_CODE)
if (mbedtls_aesni_has_support(MBEDTLS_AESNI_CLMUL)) {
mbedtls_printf(" GCM note: using AESNI.\n");
} else
#endif
#if defined(MBEDTLS_AESCE_HAVE_CODE)
if (MBEDTLS_AESCE_HAS_SUPPORT()) {
mbedtls_printf(" GCM note: using AESCE.\n");
} else
#endif
mbedtls_printf(" GCM note: built-in implementation.\n");
#endif /* MBEDTLS_GCM_ALT */
}
static const int loop_limit =
(sizeof(ct_test_data) / sizeof(*ct_test_data)) / MAX_TESTS;
for (j = 0; j < loop_limit; j++) {
int key_len = 128 + 64 * j;
for (i = 0; i < MAX_TESTS; i++) {
if (verbose != 0) {
mbedtls_printf(" AES-GCM-%3d #%d (%s): ",
key_len, i, "enc");
}
mbedtls_gcm_init(&ctx);
ret = mbedtls_gcm_setkey(&ctx, cipher,
key_test_data[key_index_test_data[i]],
key_len);
/*
* AES-192 is an optional feature that may be unavailable when
* there is an alternative underlying implementation i.e. when
* MBEDTLS_AES_ALT is defined.
*/
if (ret == MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED && key_len == 192) {
mbedtls_printf("skipped\n");
break;
} else if (ret != 0) {
goto exit;
}
ret = mbedtls_gcm_crypt_and_tag(&ctx, MBEDTLS_GCM_ENCRYPT,
pt_len_test_data[i],
iv_test_data[iv_index_test_data[i]],
iv_len_test_data[i],
additional_test_data[add_index_test_data[i]],
add_len_test_data[i],
pt_test_data[pt_index_test_data[i]],
buf, 16, tag_buf);
#if defined(MBEDTLS_GCM_ALT)
/* Allow alternative implementations to only support 12-byte nonces. */
if (ret == MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED &&
iv_len_test_data[i] != 12) {
mbedtls_printf("skipped\n");
break;
}
#endif /* defined(MBEDTLS_GCM_ALT) */
if (ret != 0) {
goto exit;
}
if (memcmp(buf, ct_test_data[j * 6 + i],
pt_len_test_data[i]) != 0 ||
memcmp(tag_buf, tag_test_data[j * 6 + i], 16) != 0) {
ret = 1;
goto exit;
}
mbedtls_gcm_free(&ctx);
if (verbose != 0) {
mbedtls_printf("passed\n");
}
mbedtls_gcm_init(&ctx);
if (verbose != 0) {
mbedtls_printf(" AES-GCM-%3d #%d (%s): ",
key_len, i, "dec");
}
ret = mbedtls_gcm_setkey(&ctx, cipher,
key_test_data[key_index_test_data[i]],
key_len);
if (ret != 0) {
goto exit;
}
ret = mbedtls_gcm_crypt_and_tag(&ctx, MBEDTLS_GCM_DECRYPT,
pt_len_test_data[i],
iv_test_data[iv_index_test_data[i]],
iv_len_test_data[i],
additional_test_data[add_index_test_data[i]],
add_len_test_data[i],
ct_test_data[j * 6 + i], buf, 16, tag_buf);
if (ret != 0) {
goto exit;
}
if (memcmp(buf, pt_test_data[pt_index_test_data[i]],
pt_len_test_data[i]) != 0 ||
memcmp(tag_buf, tag_test_data[j * 6 + i], 16) != 0) {
ret = 1;
goto exit;
}
mbedtls_gcm_free(&ctx);
if (verbose != 0) {
mbedtls_printf("passed\n");
}
mbedtls_gcm_init(&ctx);
if (verbose != 0) {
mbedtls_printf(" AES-GCM-%3d #%d split (%s): ",
key_len, i, "enc");
}
ret = mbedtls_gcm_setkey(&ctx, cipher,
key_test_data[key_index_test_data[i]],
key_len);
if (ret != 0) {
goto exit;
}
ret = mbedtls_gcm_starts(&ctx, MBEDTLS_GCM_ENCRYPT,
iv_test_data[iv_index_test_data[i]],
iv_len_test_data[i]);
if (ret != 0) {
goto exit;
}
ret = mbedtls_gcm_update_ad(&ctx,
additional_test_data[add_index_test_data[i]],
add_len_test_data[i]);
if (ret != 0) {
goto exit;
}
if (pt_len_test_data[i] > 32) {
size_t rest_len = pt_len_test_data[i] - 32;
ret = mbedtls_gcm_update(&ctx,
pt_test_data[pt_index_test_data[i]],
32,
buf, sizeof(buf), &olen);
if (ret != 0) {
goto exit;
}
if (olen != 32) {
goto exit;
}
ret = mbedtls_gcm_update(&ctx,
pt_test_data[pt_index_test_data[i]] + 32,
rest_len,
buf + 32, sizeof(buf) - 32, &olen);
if (ret != 0) {
goto exit;
}
if (olen != rest_len) {
goto exit;
}
} else {
ret = mbedtls_gcm_update(&ctx,
pt_test_data[pt_index_test_data[i]],
pt_len_test_data[i],
buf, sizeof(buf), &olen);
if (ret != 0) {
goto exit;
}
if (olen != pt_len_test_data[i]) {
goto exit;
}
}
ret = mbedtls_gcm_finish(&ctx, NULL, 0, &olen, tag_buf, 16);
if (ret != 0) {
goto exit;
}
if (memcmp(buf, ct_test_data[j * 6 + i],
pt_len_test_data[i]) != 0 ||
memcmp(tag_buf, tag_test_data[j * 6 + i], 16) != 0) {
ret = 1;
goto exit;
}
mbedtls_gcm_free(&ctx);
if (verbose != 0) {
mbedtls_printf("passed\n");
}
mbedtls_gcm_init(&ctx);
if (verbose != 0) {
mbedtls_printf(" AES-GCM-%3d #%d split (%s): ",
key_len, i, "dec");
}
ret = mbedtls_gcm_setkey(&ctx, cipher,
key_test_data[key_index_test_data[i]],
key_len);
if (ret != 0) {
goto exit;
}
ret = mbedtls_gcm_starts(&ctx, MBEDTLS_GCM_DECRYPT,
iv_test_data[iv_index_test_data[i]],
iv_len_test_data[i]);
if (ret != 0) {
goto exit;
}
ret = mbedtls_gcm_update_ad(&ctx,
additional_test_data[add_index_test_data[i]],
add_len_test_data[i]);
if (ret != 0) {
goto exit;
}
if (pt_len_test_data[i] > 32) {
size_t rest_len = pt_len_test_data[i] - 32;
ret = mbedtls_gcm_update(&ctx,
ct_test_data[j * 6 + i], 32,
buf, sizeof(buf), &olen);
if (ret != 0) {
goto exit;
}
if (olen != 32) {
goto exit;
}
ret = mbedtls_gcm_update(&ctx,
ct_test_data[j * 6 + i] + 32,
rest_len,
buf + 32, sizeof(buf) - 32, &olen);
if (ret != 0) {
goto exit;
}
if (olen != rest_len) {
goto exit;
}
} else {
ret = mbedtls_gcm_update(&ctx,
ct_test_data[j * 6 + i],
pt_len_test_data[i],
buf, sizeof(buf), &olen);
if (ret != 0) {
goto exit;
}
if (olen != pt_len_test_data[i]) {
goto exit;
}
}
ret = mbedtls_gcm_finish(&ctx, NULL, 0, &olen, tag_buf, 16);
if (ret != 0) {
goto exit;
}
if (memcmp(buf, pt_test_data[pt_index_test_data[i]],
pt_len_test_data[i]) != 0 ||
memcmp(tag_buf, tag_test_data[j * 6 + i], 16) != 0) {
ret = 1;
goto exit;
}
mbedtls_gcm_free(&ctx);
if (verbose != 0) {
mbedtls_printf("passed\n");
}
}
}
if (verbose != 0) {
mbedtls_printf("\n");
}
ret = 0;
exit:
if (ret != 0) {
if (verbose != 0) {
mbedtls_printf("failed\n");
}
mbedtls_gcm_free(&ctx);
}
return ret;
}
#endif /* MBEDTLS_SELF_TEST && MBEDTLS_AES_C */
#endif /* MBEDTLS_GCM_C */
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