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df447ba3a9
boringssl/crypto/cipher/e_aes.c
Adam Langley df447ba3a9 Add generic AES-GCM-SIV support. 
AES-GCM-SIV is an AEAD with nonce-misuse resistance. It can reuse
hardware support for AES-GCM and thus encrypt at ~66% the speed, and
decrypt at 100% the speed, of AES-GCM.

See https://tools.ietf.org/html/draft-irtf-cfrg-gcmsiv-02

This implementation is generic, not optimised, and reuses existing AES
and GHASH support as much as possible. It is guarded by !OPENSSL_SMALL,
at least for now.

Change-Id: Ia9f77b256ef5dfb8588bb9ecfe6ee0e827626f57
Reviewed-on: https://boringssl-review.googlesource.com/12541
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
2016-12-07 00:13:50 +00:00

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/* ====================================================================
* Copyright (c) 2001-2011 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ==================================================================== */
#include <string.h>
#include <openssl/aead.h>
#include <openssl/aes.h>
#include <openssl/cipher.h>
#include <openssl/cpu.h>
#include <openssl/err.h>
#include <openssl/mem.h>
#include <openssl/nid.h>
#include <openssl/rand.h>
#include <openssl/sha.h>
#include "internal.h"
#include "../internal.h"
#include "../modes/internal.h"
#if defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64)
#include <openssl/arm_arch.h>
#endif
OPENSSL_MSVC_PRAGMA(warning(disable: 4702)) /* Unreachable code. */
typedef struct {
union {
double align;
AES_KEY ks;
} ks;
block128_f block;
union {
cbc128_f cbc;
ctr128_f ctr;
} stream;
} EVP_AES_KEY;
typedef struct {
union {
double align;
AES_KEY ks;
} ks; /* AES key schedule to use */
int key_set; /* Set if key initialised */
int iv_set; /* Set if an iv is set */
GCM128_CONTEXT gcm;
uint8_t *iv; /* Temporary IV store */
int ivlen; /* IV length */
int taglen;
int iv_gen; /* It is OK to generate IVs */
ctr128_f ctr;
} EVP_AES_GCM_CTX;
#if !defined(OPENSSL_NO_ASM) && \
(defined(OPENSSL_X86_64) || defined(OPENSSL_X86))
#define VPAES
static char vpaes_capable(void) {
return (OPENSSL_ia32cap_P[1] & (1 << (41 - 32))) != 0;
}
#if defined(OPENSSL_X86_64)
#define BSAES
static char bsaes_capable(void) {
return vpaes_capable();
}
#endif
#elif !defined(OPENSSL_NO_ASM) && \
(defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64))
#if defined(OPENSSL_ARM) && __ARM_MAX_ARCH__ >= 7
#define BSAES
static char bsaes_capable(void) {
return CRYPTO_is_NEON_capable();
}
#endif
#define HWAES
static int hwaes_capable(void) {
return CRYPTO_is_ARMv8_AES_capable();
}
#elif !defined(OPENSSL_NO_ASM) && defined(OPENSSL_PPC64LE)
#define HWAES
static int hwaes_capable(void) {
return CRYPTO_is_PPC64LE_vcrypto_capable();
}
#endif /* OPENSSL_PPC64LE */
#if defined(BSAES)
/* On platforms where BSAES gets defined (just above), then these functions are
* provided by asm. */
void bsaes_cbc_encrypt(const uint8_t *in, uint8_t *out, size_t length,
const AES_KEY *key, uint8_t ivec[16], int enc);
void bsaes_ctr32_encrypt_blocks(const uint8_t *in, uint8_t *out, size_t len,
const AES_KEY *key, const uint8_t ivec[16]);
#else
static char bsaes_capable(void) {
return 0;
}
/* On other platforms, bsaes_capable() will always return false and so the
* following will never be called. */
static void bsaes_cbc_encrypt(const uint8_t *in, uint8_t *out, size_t length,
const AES_KEY *key, uint8_t ivec[16], int enc) {
abort();
}
static void bsaes_ctr32_encrypt_blocks(const uint8_t *in, uint8_t *out,
size_t len, const AES_KEY *key,
const uint8_t ivec[16]) {
abort();
}
#endif
#if defined(VPAES)
/* On platforms where VPAES gets defined (just above), then these functions are
* provided by asm. */
int vpaes_set_encrypt_key(const uint8_t *userKey, int bits, AES_KEY *key);
int vpaes_set_decrypt_key(const uint8_t *userKey, int bits, AES_KEY *key);
void vpaes_encrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key);
void vpaes_decrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key);
void vpaes_cbc_encrypt(const uint8_t *in, uint8_t *out, size_t length,
const AES_KEY *key, uint8_t *ivec, int enc);
#else
static char vpaes_capable(void) {
return 0;
}
/* On other platforms, vpaes_capable() will always return false and so the
* following will never be called. */
static int vpaes_set_encrypt_key(const uint8_t *userKey, int bits,
AES_KEY *key) {
abort();
}
static int vpaes_set_decrypt_key(const uint8_t *userKey, int bits,
AES_KEY *key) {
abort();
}
static void vpaes_encrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key) {
abort();
}
static void vpaes_decrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key) {
abort();
}
static void vpaes_cbc_encrypt(const uint8_t *in, uint8_t *out, size_t length,
const AES_KEY *key, uint8_t *ivec, int enc) {
abort();
}
#endif
#if defined(HWAES)
int aes_hw_set_encrypt_key(const uint8_t *user_key, const int bits,
AES_KEY *key);
int aes_hw_set_decrypt_key(const uint8_t *user_key, const int bits,
AES_KEY *key);
void aes_hw_encrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key);
void aes_hw_decrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key);
void aes_hw_cbc_encrypt(const uint8_t *in, uint8_t *out, size_t length,
const AES_KEY *key, uint8_t *ivec, const int enc);
void aes_hw_ctr32_encrypt_blocks(const uint8_t *in, uint8_t *out, size_t len,
const AES_KEY *key, const uint8_t ivec[16]);
#else
/* If HWAES isn't defined then we provide dummy functions for each of the hwaes
* functions. */
static int hwaes_capable(void) {
return 0;
}
static int aes_hw_set_encrypt_key(const uint8_t *user_key, int bits,
AES_KEY *key) {
abort();
}
static int aes_hw_set_decrypt_key(const uint8_t *user_key, int bits,
AES_KEY *key) {
abort();
}
static void aes_hw_encrypt(const uint8_t *in, uint8_t *out,
const AES_KEY *key) {
abort();
}
static void aes_hw_decrypt(const uint8_t *in, uint8_t *out,
const AES_KEY *key) {
abort();
}
static void aes_hw_cbc_encrypt(const uint8_t *in, uint8_t *out, size_t length,
const AES_KEY *key, uint8_t *ivec, int enc) {
abort();
}
static void aes_hw_ctr32_encrypt_blocks(const uint8_t *in, uint8_t *out,
size_t len, const AES_KEY *key,
const uint8_t ivec[16]) {
abort();
}
#endif
#if !defined(OPENSSL_NO_ASM) && \
(defined(OPENSSL_X86_64) || defined(OPENSSL_X86))
int aesni_set_encrypt_key(const uint8_t *userKey, int bits, AES_KEY *key);
int aesni_set_decrypt_key(const uint8_t *userKey, int bits, AES_KEY *key);
void aesni_encrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key);
void aesni_decrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key);
void aesni_ecb_encrypt(const uint8_t *in, uint8_t *out, size_t length,
const AES_KEY *key, int enc);
void aesni_cbc_encrypt(const uint8_t *in, uint8_t *out, size_t length,
const AES_KEY *key, uint8_t *ivec, int enc);
#else
/* On other platforms, aesni_capable() will always return false and so the
* following will never be called. */
static void aesni_encrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key) {
abort();
}
static int aesni_set_encrypt_key(const uint8_t *userKey, int bits,
AES_KEY *key) {
abort();
}
static void aesni_ctr32_encrypt_blocks(const uint8_t *in, uint8_t *out,
size_t blocks, const void *key,
const uint8_t *ivec) {
abort();
}
#endif
static int aes_init_key(EVP_CIPHER_CTX *ctx, const uint8_t *key,
const uint8_t *iv, int enc) {
int ret, mode;
EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data;
mode = ctx->cipher->flags & EVP_CIPH_MODE_MASK;
if ((mode == EVP_CIPH_ECB_MODE || mode == EVP_CIPH_CBC_MODE) && !enc) {
if (hwaes_capable()) {
ret = aes_hw_set_decrypt_key(key, ctx->key_len * 8, &dat->ks.ks);
dat->block = (block128_f)aes_hw_decrypt;
dat->stream.cbc = NULL;
if (mode == EVP_CIPH_CBC_MODE) {
dat->stream.cbc = (cbc128_f)aes_hw_cbc_encrypt;
}
} else if (bsaes_capable() && mode == EVP_CIPH_CBC_MODE) {
ret = AES_set_decrypt_key(key, ctx->key_len * 8, &dat->ks.ks);
dat->block = (block128_f)AES_decrypt;
dat->stream.cbc = (cbc128_f)bsaes_cbc_encrypt;
} else if (vpaes_capable()) {
ret = vpaes_set_decrypt_key(key, ctx->key_len * 8, &dat->ks.ks);
dat->block = (block128_f)vpaes_decrypt;
dat->stream.cbc =
mode == EVP_CIPH_CBC_MODE ? (cbc128_f)vpaes_cbc_encrypt : NULL;
} else {
ret = AES_set_decrypt_key(key, ctx->key_len * 8, &dat->ks.ks);
dat->block = (block128_f)AES_decrypt;
dat->stream.cbc =
mode == EVP_CIPH_CBC_MODE ? (cbc128_f)AES_cbc_encrypt : NULL;
}
} else if (hwaes_capable()) {
ret = aes_hw_set_encrypt_key(key, ctx->key_len * 8, &dat->ks.ks);
dat->block = (block128_f)aes_hw_encrypt;
dat->stream.cbc = NULL;
if (mode == EVP_CIPH_CBC_MODE) {
dat->stream.cbc = (cbc128_f)aes_hw_cbc_encrypt;
} else if (mode == EVP_CIPH_CTR_MODE) {
dat->stream.ctr = (ctr128_f)aes_hw_ctr32_encrypt_blocks;
}
} else if (bsaes_capable() && mode == EVP_CIPH_CTR_MODE) {
ret = AES_set_encrypt_key(key, ctx->key_len * 8, &dat->ks.ks);
dat->block = (block128_f)AES_encrypt;
dat->stream.ctr = (ctr128_f)bsaes_ctr32_encrypt_blocks;
} else if (vpaes_capable()) {
ret = vpaes_set_encrypt_key(key, ctx->key_len * 8, &dat->ks.ks);
dat->block = (block128_f)vpaes_encrypt;
dat->stream.cbc =
mode == EVP_CIPH_CBC_MODE ? (cbc128_f)vpaes_cbc_encrypt : NULL;
} else {
ret = AES_set_encrypt_key(key, ctx->key_len * 8, &dat->ks.ks);
dat->block = (block128_f)AES_encrypt;
dat->stream.cbc =
mode == EVP_CIPH_CBC_MODE ? (cbc128_f)AES_cbc_encrypt : NULL;
}
if (ret < 0) {
OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_AES_KEY_SETUP_FAILED);
return 0;
}
return 1;
}
static int aes_cbc_cipher(EVP_CIPHER_CTX *ctx, uint8_t *out, const uint8_t *in,
size_t len) {
EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data;
if (dat->stream.cbc) {
(*dat->stream.cbc)(in, out, len, &dat->ks, ctx->iv, ctx->encrypt);
} else if (ctx->encrypt) {
CRYPTO_cbc128_encrypt(in, out, len, &dat->ks, ctx->iv, dat->block);
} else {
CRYPTO_cbc128_decrypt(in, out, len, &dat->ks, ctx->iv, dat->block);
}
return 1;
}
static int aes_ecb_cipher(EVP_CIPHER_CTX *ctx, uint8_t *out, const uint8_t *in,
size_t len) {
size_t bl = ctx->cipher->block_size;
EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data;
if (len < bl) {
return 1;
}
len -= bl;
for (size_t i = 0; i <= len; i += bl) {
(*dat->block)(in + i, out + i, &dat->ks);
}
return 1;
}
static int aes_ctr_cipher(EVP_CIPHER_CTX *ctx, uint8_t *out, const uint8_t *in,
size_t len) {
EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data;
if (dat->stream.ctr) {
CRYPTO_ctr128_encrypt_ctr32(in, out, len, &dat->ks, ctx->iv, ctx->buf,
&ctx->num, dat->stream.ctr);
} else {
CRYPTO_ctr128_encrypt(in, out, len, &dat->ks, ctx->iv, ctx->buf, &ctx->num,
dat->block);
}
return 1;
}
static int aes_ofb_cipher(EVP_CIPHER_CTX *ctx, uint8_t *out, const uint8_t *in,
size_t len) {
EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data;
CRYPTO_ofb128_encrypt(in, out, len, &dat->ks, ctx->iv, &ctx->num, dat->block);
return 1;
}
static char aesni_capable(void);
static ctr128_f aes_ctr_set_key(AES_KEY *aes_key, GCM128_CONTEXT *gcm_ctx,
block128_f *out_block, const uint8_t *key,
size_t key_len) {
if (aesni_capable()) {
aesni_set_encrypt_key(key, key_len * 8, aes_key);
if (gcm_ctx != NULL) {
CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)aesni_encrypt);
}
if (out_block) {
*out_block = (block128_f) aesni_encrypt;
}
return (ctr128_f)aesni_ctr32_encrypt_blocks;
}
if (hwaes_capable()) {
aes_hw_set_encrypt_key(key, key_len * 8, aes_key);
if (gcm_ctx != NULL) {
CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)aes_hw_encrypt);
}
if (out_block) {
*out_block = (block128_f) aes_hw_encrypt;
}
return (ctr128_f)aes_hw_ctr32_encrypt_blocks;
}
if (bsaes_capable()) {
AES_set_encrypt_key(key, key_len * 8, aes_key);
if (gcm_ctx != NULL) {
CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)AES_encrypt);
}
if (out_block) {
*out_block = (block128_f) AES_encrypt;
}
return (ctr128_f)bsaes_ctr32_encrypt_blocks;
}
if (vpaes_capable()) {
vpaes_set_encrypt_key(key, key_len * 8, aes_key);
if (out_block) {
*out_block = (block128_f) vpaes_encrypt;
}
if (gcm_ctx != NULL) {
CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)vpaes_encrypt);
}
return NULL;
}
AES_set_encrypt_key(key, key_len * 8, aes_key);
if (gcm_ctx != NULL) {
CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)AES_encrypt);
}
if (out_block) {
*out_block = (block128_f) AES_encrypt;
}
return NULL;
}
static int aes_gcm_init_key(EVP_CIPHER_CTX *ctx, const uint8_t *key,
const uint8_t *iv, int enc) {
EVP_AES_GCM_CTX *gctx = ctx->cipher_data;
if (!iv && !key) {
return 1;
}
if (key) {
gctx->ctr =
aes_ctr_set_key(&gctx->ks.ks, &gctx->gcm, NULL, key, ctx->key_len);
/* If we have an iv can set it directly, otherwise use saved IV. */
if (iv == NULL && gctx->iv_set) {
iv = gctx->iv;
}
if (iv) {
CRYPTO_gcm128_setiv(&gctx->gcm, &gctx->ks.ks, iv, gctx->ivlen);
gctx->iv_set = 1;
}
gctx->key_set = 1;
} else {
/* If key set use IV, otherwise copy */
if (gctx->key_set) {
CRYPTO_gcm128_setiv(&gctx->gcm, &gctx->ks.ks, iv, gctx->ivlen);
} else {
memcpy(gctx->iv, iv, gctx->ivlen);
}
gctx->iv_set = 1;
gctx->iv_gen = 0;
}
return 1;
}
static void aes_gcm_cleanup(EVP_CIPHER_CTX *c) {
EVP_AES_GCM_CTX *gctx = c->cipher_data;
OPENSSL_cleanse(&gctx->gcm, sizeof(gctx->gcm));
if (gctx->iv != c->iv) {
OPENSSL_free(gctx->iv);
}
}
/* increment counter (64-bit int) by 1 */
static void ctr64_inc(uint8_t *counter) {
int n = 8;
uint8_t c;
do {
--n;
c = counter[n];
++c;
counter[n] = c;
if (c) {
return;
}
} while (n);
}
static int aes_gcm_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr) {
EVP_AES_GCM_CTX *gctx = c->cipher_data;
switch (type) {
case EVP_CTRL_INIT:
gctx->key_set = 0;
gctx->iv_set = 0;
gctx->ivlen = c->cipher->iv_len;
gctx->iv = c->iv;
gctx->taglen = -1;
gctx->iv_gen = 0;
return 1;
case EVP_CTRL_GCM_SET_IVLEN:
if (arg <= 0) {
return 0;
}
/* Allocate memory for IV if needed */
if (arg > EVP_MAX_IV_LENGTH && arg > gctx->ivlen) {
if (gctx->iv != c->iv) {
OPENSSL_free(gctx->iv);
}
gctx->iv = OPENSSL_malloc(arg);
if (!gctx->iv) {
return 0;
}
}
gctx->ivlen = arg;
return 1;
case EVP_CTRL_GCM_SET_TAG:
if (arg <= 0 || arg > 16 || c->encrypt) {
return 0;
}
memcpy(c->buf, ptr, arg);
gctx->taglen = arg;
return 1;
case EVP_CTRL_GCM_GET_TAG:
if (arg <= 0 || arg > 16 || !c->encrypt || gctx->taglen < 0) {
return 0;
}
memcpy(ptr, c->buf, arg);
return 1;
case EVP_CTRL_GCM_SET_IV_FIXED:
/* Special case: -1 length restores whole IV */
if (arg == -1) {
memcpy(gctx->iv, ptr, gctx->ivlen);
gctx->iv_gen = 1;
return 1;
}
/* Fixed field must be at least 4 bytes and invocation field
* at least 8. */
if (arg < 4 || (gctx->ivlen - arg) < 8) {
return 0;
}
if (arg) {
memcpy(gctx->iv, ptr, arg);
}
if (c->encrypt && !RAND_bytes(gctx->iv + arg, gctx->ivlen - arg)) {
return 0;
}
gctx->iv_gen = 1;
return 1;
case EVP_CTRL_GCM_IV_GEN:
if (gctx->iv_gen == 0 || gctx->key_set == 0) {
return 0;
}
CRYPTO_gcm128_setiv(&gctx->gcm, &gctx->ks.ks, gctx->iv, gctx->ivlen);
if (arg <= 0 || arg > gctx->ivlen) {
arg = gctx->ivlen;
}
memcpy(ptr, gctx->iv + gctx->ivlen - arg, arg);
/* Invocation field will be at least 8 bytes in size and
* so no need to check wrap around or increment more than
* last 8 bytes. */
ctr64_inc(gctx->iv + gctx->ivlen - 8);
gctx->iv_set = 1;
return 1;
case EVP_CTRL_GCM_SET_IV_INV:
if (gctx->iv_gen == 0 || gctx->key_set == 0 || c->encrypt) {
return 0;
}
memcpy(gctx->iv + gctx->ivlen - arg, ptr, arg);
CRYPTO_gcm128_setiv(&gctx->gcm, &gctx->ks.ks, gctx->iv, gctx->ivlen);
gctx->iv_set = 1;
return 1;
case EVP_CTRL_COPY: {
EVP_CIPHER_CTX *out = ptr;
EVP_AES_GCM_CTX *gctx_out = out->cipher_data;
if (gctx->iv == c->iv) {
gctx_out->iv = out->iv;
} else {
gctx_out->iv = OPENSSL_malloc(gctx->ivlen);
if (!gctx_out->iv) {
return 0;
}
memcpy(gctx_out->iv, gctx->iv, gctx->ivlen);
}
return 1;
}
default:
return -1;
}
}
static int aes_gcm_cipher(EVP_CIPHER_CTX *ctx, uint8_t *out, const uint8_t *in,
size_t len) {
EVP_AES_GCM_CTX *gctx = ctx->cipher_data;
/* If not set up, return error */
if (!gctx->key_set) {
return -1;
}
if (!gctx->iv_set) {
return -1;
}
if (in) {
if (out == NULL) {
if (!CRYPTO_gcm128_aad(&gctx->gcm, in, len)) {
return -1;
}
} else if (ctx->encrypt) {
if (gctx->ctr) {
if (!CRYPTO_gcm128_encrypt_ctr32(&gctx->gcm, &gctx->ks.ks, in, out, len,
gctx->ctr)) {
return -1;
}
} else {
if (!CRYPTO_gcm128_encrypt(&gctx->gcm, &gctx->ks.ks, in, out, len)) {
return -1;
}
}
} else {
if (gctx->ctr) {
if (!CRYPTO_gcm128_decrypt_ctr32(&gctx->gcm, &gctx->ks.ks, in, out, len,
gctx->ctr)) {
return -1;
}
} else {
if (!CRYPTO_gcm128_decrypt(&gctx->gcm, &gctx->ks.ks, in, out, len)) {
return -1;
}
}
}
return len;
} else {
if (!ctx->encrypt) {
if (gctx->taglen < 0 ||
!CRYPTO_gcm128_finish(&gctx->gcm, ctx->buf, gctx->taglen)) {
return -1;
}
gctx->iv_set = 0;
return 0;
}
CRYPTO_gcm128_tag(&gctx->gcm, ctx->buf, 16);
gctx->taglen = 16;
/* Don't reuse the IV */
gctx->iv_set = 0;
return 0;
}
}
static const EVP_CIPHER aes_128_cbc = {
NID_aes_128_cbc, 16 /* block_size */, 16 /* key_size */,
16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_CBC_MODE,
NULL /* app_data */, aes_init_key, aes_cbc_cipher,
NULL /* cleanup */, NULL /* ctrl */};
static const EVP_CIPHER aes_128_ctr = {
NID_aes_128_ctr, 1 /* block_size */, 16 /* key_size */,
16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_CTR_MODE,
NULL /* app_data */, aes_init_key, aes_ctr_cipher,
NULL /* cleanup */, NULL /* ctrl */};
static const EVP_CIPHER aes_128_ecb = {
NID_aes_128_ecb, 16 /* block_size */, 16 /* key_size */,
0 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_ECB_MODE,
NULL /* app_data */, aes_init_key, aes_ecb_cipher,
NULL /* cleanup */, NULL /* ctrl */};
static const EVP_CIPHER aes_128_ofb = {
NID_aes_128_ofb128, 1 /* block_size */, 16 /* key_size */,
16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_OFB_MODE,
NULL /* app_data */, aes_init_key, aes_ofb_cipher,
NULL /* cleanup */, NULL /* ctrl */};
static const EVP_CIPHER aes_128_gcm = {
NID_aes_128_gcm, 1 /* block_size */, 16 /* key_size */, 12 /* iv_len */,
sizeof(EVP_AES_GCM_CTX),
EVP_CIPH_GCM_MODE | EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER |
EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT |
EVP_CIPH_FLAG_AEAD_CIPHER,
NULL /* app_data */, aes_gcm_init_key, aes_gcm_cipher, aes_gcm_cleanup,
aes_gcm_ctrl};
static const EVP_CIPHER aes_192_cbc = {
NID_aes_192_cbc, 16 /* block_size */, 24 /* key_size */,
16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_CBC_MODE,
NULL /* app_data */, aes_init_key, aes_cbc_cipher,
NULL /* cleanup */, NULL /* ctrl */};
static const EVP_CIPHER aes_192_ctr = {
NID_aes_192_ctr, 1 /* block_size */, 24 /* key_size */,
16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_CTR_MODE,
NULL /* app_data */, aes_init_key, aes_ctr_cipher,
NULL /* cleanup */, NULL /* ctrl */};
static const EVP_CIPHER aes_192_ecb = {
NID_aes_192_ecb, 16 /* block_size */, 24 /* key_size */,
0 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_ECB_MODE,
NULL /* app_data */, aes_init_key, aes_ecb_cipher,
NULL /* cleanup */, NULL /* ctrl */};
static const EVP_CIPHER aes_192_gcm = {
NID_aes_192_gcm, 1 /* block_size */, 24 /* key_size */, 12 /* iv_len */,
sizeof(EVP_AES_GCM_CTX),
EVP_CIPH_GCM_MODE | EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER |
EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT |
EVP_CIPH_FLAG_AEAD_CIPHER,
NULL /* app_data */, aes_gcm_init_key, aes_gcm_cipher, aes_gcm_cleanup,
aes_gcm_ctrl};
static const EVP_CIPHER aes_256_cbc = {
NID_aes_256_cbc, 16 /* block_size */, 32 /* key_size */,
16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_CBC_MODE,
NULL /* app_data */, aes_init_key, aes_cbc_cipher,
NULL /* cleanup */, NULL /* ctrl */};
static const EVP_CIPHER aes_256_ctr = {
NID_aes_256_ctr, 1 /* block_size */, 32 /* key_size */,
16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_CTR_MODE,
NULL /* app_data */, aes_init_key, aes_ctr_cipher,
NULL /* cleanup */, NULL /* ctrl */};
static const EVP_CIPHER aes_256_ecb = {
NID_aes_256_ecb, 16 /* block_size */, 32 /* key_size */,
0 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_ECB_MODE,
NULL /* app_data */, aes_init_key, aes_ecb_cipher,
NULL /* cleanup */, NULL /* ctrl */};
static const EVP_CIPHER aes_256_ofb = {
NID_aes_256_ofb128, 1 /* block_size */, 32 /* key_size */,
16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_OFB_MODE,
NULL /* app_data */, aes_init_key, aes_ofb_cipher,
NULL /* cleanup */, NULL /* ctrl */};
static const EVP_CIPHER aes_256_gcm = {
NID_aes_256_gcm, 1 /* block_size */, 32 /* key_size */, 12 /* iv_len */,
sizeof(EVP_AES_GCM_CTX),
EVP_CIPH_GCM_MODE | EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER |
EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT |
EVP_CIPH_FLAG_AEAD_CIPHER,
NULL /* app_data */, aes_gcm_init_key, aes_gcm_cipher, aes_gcm_cleanup,
aes_gcm_ctrl};
#if !defined(OPENSSL_NO_ASM) && \
(defined(OPENSSL_X86_64) || defined(OPENSSL_X86))
/* AES-NI section. */
static char aesni_capable(void) {
return (OPENSSL_ia32cap_P[1] & (1 << (57 - 32))) != 0;
}
static int aesni_init_key(EVP_CIPHER_CTX *ctx, const uint8_t *key,
const uint8_t *iv, int enc) {
int ret, mode;
EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data;
mode = ctx->cipher->flags & EVP_CIPH_MODE_MASK;
if ((mode == EVP_CIPH_ECB_MODE || mode == EVP_CIPH_CBC_MODE) && !enc) {
ret = aesni_set_decrypt_key(key, ctx->key_len * 8, ctx->cipher_data);
dat->block = (block128_f)aesni_decrypt;
dat->stream.cbc =
mode == EVP_CIPH_CBC_MODE ? (cbc128_f)aesni_cbc_encrypt : NULL;
} else {
ret = aesni_set_encrypt_key(key, ctx->key_len * 8, ctx->cipher_data);
dat->block = (block128_f)aesni_encrypt;
if (mode == EVP_CIPH_CBC_MODE) {
dat->stream.cbc = (cbc128_f)aesni_cbc_encrypt;
} else if (mode == EVP_CIPH_CTR_MODE) {
dat->stream.ctr = (ctr128_f)aesni_ctr32_encrypt_blocks;
} else {
dat->stream.cbc = NULL;
}
}
if (ret < 0) {
OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_AES_KEY_SETUP_FAILED);
return 0;
}
return 1;
}
static int aesni_cbc_cipher(EVP_CIPHER_CTX *ctx, uint8_t *out,
const uint8_t *in, size_t len) {
aesni_cbc_encrypt(in, out, len, ctx->cipher_data, ctx->iv, ctx->encrypt);
return 1;
}
static int aesni_ecb_cipher(EVP_CIPHER_CTX *ctx, uint8_t *out,
const uint8_t *in, size_t len) {
size_t bl = ctx->cipher->block_size;
if (len < bl) {
return 1;
}
aesni_ecb_encrypt(in, out, len, ctx->cipher_data, ctx->encrypt);
return 1;
}
static int aesni_gcm_init_key(EVP_CIPHER_CTX *ctx, const uint8_t *key,
const uint8_t *iv, int enc) {
EVP_AES_GCM_CTX *gctx = ctx->cipher_data;
if (!iv && !key) {
return 1;
}
if (key) {
aesni_set_encrypt_key(key, ctx->key_len * 8, &gctx->ks.ks);
CRYPTO_gcm128_init(&gctx->gcm, &gctx->ks, (block128_f)aesni_encrypt);
gctx->ctr = (ctr128_f)aesni_ctr32_encrypt_blocks;
/* If we have an iv can set it directly, otherwise use
* saved IV. */
if (iv == NULL && gctx->iv_set) {
iv = gctx->iv;
}
if (iv) {
CRYPTO_gcm128_setiv(&gctx->gcm, &gctx->ks.ks, iv, gctx->ivlen);
gctx->iv_set = 1;
}
gctx->key_set = 1;
} else {
/* If key set use IV, otherwise copy */
if (gctx->key_set) {
CRYPTO_gcm128_setiv(&gctx->gcm, &gctx->ks.ks, iv, gctx->ivlen);
} else {
memcpy(gctx->iv, iv, gctx->ivlen);
}
gctx->iv_set = 1;
gctx->iv_gen = 0;
}
return 1;
}
static const EVP_CIPHER aesni_128_cbc = {
NID_aes_128_cbc, 16 /* block_size */, 16 /* key_size */,
16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_CBC_MODE,
NULL /* app_data */, aesni_init_key, aesni_cbc_cipher,
NULL /* cleanup */, NULL /* ctrl */};
static const EVP_CIPHER aesni_128_ctr = {
NID_aes_128_ctr, 1 /* block_size */, 16 /* key_size */,
16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_CTR_MODE,
NULL /* app_data */, aesni_init_key, aes_ctr_cipher,
NULL /* cleanup */, NULL /* ctrl */};
static const EVP_CIPHER aesni_128_ecb = {
NID_aes_128_ecb, 16 /* block_size */, 16 /* key_size */,
0 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_ECB_MODE,
NULL /* app_data */, aesni_init_key, aesni_ecb_cipher,
NULL /* cleanup */, NULL /* ctrl */};
static const EVP_CIPHER aesni_128_ofb = {
NID_aes_128_ofb128, 1 /* block_size */, 16 /* key_size */,
16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_OFB_MODE,
NULL /* app_data */, aesni_init_key, aes_ofb_cipher,
NULL /* cleanup */, NULL /* ctrl */};
static const EVP_CIPHER aesni_128_gcm = {
NID_aes_128_gcm, 1 /* block_size */, 16 /* key_size */, 12 /* iv_len */,
sizeof(EVP_AES_GCM_CTX),
EVP_CIPH_GCM_MODE | EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER |
EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT |
EVP_CIPH_FLAG_AEAD_CIPHER,
NULL /* app_data */, aesni_gcm_init_key, aes_gcm_cipher, aes_gcm_cleanup,
aes_gcm_ctrl};
static const EVP_CIPHER aesni_192_cbc = {
NID_aes_192_cbc, 16 /* block_size */, 24 /* key_size */,
16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_CBC_MODE,
NULL /* app_data */, aesni_init_key, aesni_cbc_cipher,
NULL /* cleanup */, NULL /* ctrl */};
static const EVP_CIPHER aesni_192_ctr = {
NID_aes_192_ctr, 1 /* block_size */, 24 /* key_size */,
16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_CTR_MODE,
NULL /* app_data */, aesni_init_key, aes_ctr_cipher,
NULL /* cleanup */, NULL /* ctrl */};
static const EVP_CIPHER aesni_192_ecb = {
NID_aes_192_ecb, 16 /* block_size */, 24 /* key_size */,
0 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_ECB_MODE,
NULL /* app_data */, aesni_init_key, aesni_ecb_cipher,
NULL /* cleanup */, NULL /* ctrl */};
static const EVP_CIPHER aesni_192_gcm = {
NID_aes_192_gcm, 1 /* block_size */, 24 /* key_size */, 12 /* iv_len */,
sizeof(EVP_AES_GCM_CTX),
EVP_CIPH_GCM_MODE | EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER |
EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT |
EVP_CIPH_FLAG_AEAD_CIPHER,
NULL /* app_data */, aesni_gcm_init_key, aes_gcm_cipher, aes_gcm_cleanup,
aes_gcm_ctrl};
static const EVP_CIPHER aesni_256_cbc = {
NID_aes_256_cbc, 16 /* block_size */, 32 /* key_size */,
16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_CBC_MODE,
NULL /* app_data */, aesni_init_key, aesni_cbc_cipher,
NULL /* cleanup */, NULL /* ctrl */};
static const EVP_CIPHER aesni_256_ctr = {
NID_aes_256_ctr, 1 /* block_size */, 32 /* key_size */,
16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_CTR_MODE,
NULL /* app_data */, aesni_init_key, aes_ctr_cipher,
NULL /* cleanup */, NULL /* ctrl */};
static const EVP_CIPHER aesni_256_ecb = {
NID_aes_256_ecb, 16 /* block_size */, 32 /* key_size */,
0 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_ECB_MODE,
NULL /* app_data */, aesni_init_key, aesni_ecb_cipher,
NULL /* cleanup */, NULL /* ctrl */};
static const EVP_CIPHER aesni_256_ofb = {
NID_aes_256_ofb128, 1 /* block_size */, 32 /* key_size */,
16 /* iv_len */, sizeof(EVP_AES_KEY), EVP_CIPH_OFB_MODE,
NULL /* app_data */, aesni_init_key, aes_ofb_cipher,
NULL /* cleanup */, NULL /* ctrl */};
static const EVP_CIPHER aesni_256_gcm = {
NID_aes_256_gcm, 1 /* block_size */, 32 /* key_size */, 12 /* iv_len */,
sizeof(EVP_AES_GCM_CTX),
EVP_CIPH_GCM_MODE | EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER |
EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT | EVP_CIPH_CUSTOM_COPY |
EVP_CIPH_FLAG_AEAD_CIPHER,
NULL /* app_data */, aesni_gcm_init_key, aes_gcm_cipher, aes_gcm_cleanup,
aes_gcm_ctrl};
#define EVP_CIPHER_FUNCTION(keybits, mode) \
const EVP_CIPHER *EVP_aes_##keybits##_##mode(void) { \
if (aesni_capable()) { \
return &aesni_##keybits##_##mode; \
} else { \
return &aes_##keybits##_##mode; \
} \
}
#else /* ^^^ OPENSSL_X86_64 || OPENSSL_X86 */
static char aesni_capable(void) {
return 0;
}
#define EVP_CIPHER_FUNCTION(keybits, mode) \
const EVP_CIPHER *EVP_aes_##keybits##_##mode(void) { \
return &aes_##keybits##_##mode; \
}
#endif
EVP_CIPHER_FUNCTION(128, cbc)
EVP_CIPHER_FUNCTION(128, ctr)
EVP_CIPHER_FUNCTION(128, ecb)
EVP_CIPHER_FUNCTION(128, ofb)
EVP_CIPHER_FUNCTION(128, gcm)
EVP_CIPHER_FUNCTION(192, cbc)
EVP_CIPHER_FUNCTION(192, ctr)
EVP_CIPHER_FUNCTION(192, ecb)
EVP_CIPHER_FUNCTION(192, gcm)
EVP_CIPHER_FUNCTION(256, cbc)
EVP_CIPHER_FUNCTION(256, ctr)
EVP_CIPHER_FUNCTION(256, ecb)
EVP_CIPHER_FUNCTION(256, ofb)
EVP_CIPHER_FUNCTION(256, gcm)
#define EVP_AEAD_AES_GCM_TAG_LEN 16
struct aead_aes_gcm_ctx {
union {
double align;
AES_KEY ks;
} ks;
GCM128_CONTEXT gcm;
ctr128_f ctr;
uint8_t tag_len;
};
static int aead_aes_gcm_init(EVP_AEAD_CTX *ctx, const uint8_t *key,
size_t key_len, size_t tag_len) {
struct aead_aes_gcm_ctx *gcm_ctx;
const size_t key_bits = key_len * 8;
if (key_bits != 128 && key_bits != 256) {
OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BAD_KEY_LENGTH);
return 0; /* EVP_AEAD_CTX_init should catch this. */
}
if (tag_len == EVP_AEAD_DEFAULT_TAG_LENGTH) {
tag_len = EVP_AEAD_AES_GCM_TAG_LEN;
}
if (tag_len > EVP_AEAD_AES_GCM_TAG_LEN) {
OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_TAG_TOO_LARGE);
return 0;
}
gcm_ctx = OPENSSL_malloc(sizeof(struct aead_aes_gcm_ctx));
if (gcm_ctx == NULL) {
return 0;
}
gcm_ctx->ctr =
aes_ctr_set_key(&gcm_ctx->ks.ks, &gcm_ctx->gcm, NULL, key, key_len);
gcm_ctx->tag_len = tag_len;
ctx->aead_state = gcm_ctx;
return 1;
}
static void aead_aes_gcm_cleanup(EVP_AEAD_CTX *ctx) {
struct aead_aes_gcm_ctx *gcm_ctx = ctx->aead_state;
OPENSSL_cleanse(gcm_ctx, sizeof(struct aead_aes_gcm_ctx));
OPENSSL_free(gcm_ctx);
}
static int aead_aes_gcm_seal(const EVP_AEAD_CTX *ctx, uint8_t *out,
size_t *out_len, size_t max_out_len,
const uint8_t *nonce, size_t nonce_len,
const uint8_t *in, size_t in_len,
const uint8_t *ad, size_t ad_len) {
const struct aead_aes_gcm_ctx *gcm_ctx = ctx->aead_state;
GCM128_CONTEXT gcm;
if (in_len + gcm_ctx->tag_len < in_len) {
OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_TOO_LARGE);
return 0;
}
if (max_out_len < in_len + gcm_ctx->tag_len) {
OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BUFFER_TOO_SMALL);
return 0;
}
const AES_KEY *key = &gcm_ctx->ks.ks;
memcpy(&gcm, &gcm_ctx->gcm, sizeof(gcm));
CRYPTO_gcm128_setiv(&gcm, key, nonce, nonce_len);
if (ad_len > 0 && !CRYPTO_gcm128_aad(&gcm, ad, ad_len)) {
return 0;
}
if (gcm_ctx->ctr) {
if (!CRYPTO_gcm128_encrypt_ctr32(&gcm, key, in, out, in_len,
gcm_ctx->ctr)) {
return 0;
}
} else {
if (!CRYPTO_gcm128_encrypt(&gcm, key, in, out, in_len)) {
return 0;
}
}
CRYPTO_gcm128_tag(&gcm, out + in_len, gcm_ctx->tag_len);
*out_len = in_len + gcm_ctx->tag_len;
return 1;
}
static int aead_aes_gcm_open(const EVP_AEAD_CTX *ctx, uint8_t *out,
size_t *out_len, size_t max_out_len,
const uint8_t *nonce, size_t nonce_len,
const uint8_t *in, size_t in_len,
const uint8_t *ad, size_t ad_len) {
const struct aead_aes_gcm_ctx *gcm_ctx = ctx->aead_state;
uint8_t tag[EVP_AEAD_AES_GCM_TAG_LEN];
size_t plaintext_len;
GCM128_CONTEXT gcm;
if (in_len < gcm_ctx->tag_len) {
OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BAD_DECRYPT);
return 0;
}
plaintext_len = in_len - gcm_ctx->tag_len;
if (max_out_len < plaintext_len) {
OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BUFFER_TOO_SMALL);
return 0;
}
const AES_KEY *key = &gcm_ctx->ks.ks;
memcpy(&gcm, &gcm_ctx->gcm, sizeof(gcm));
CRYPTO_gcm128_setiv(&gcm, key, nonce, nonce_len);
if (!CRYPTO_gcm128_aad(&gcm, ad, ad_len)) {
return 0;
}
if (gcm_ctx->ctr) {
if (!CRYPTO_gcm128_decrypt_ctr32(&gcm, key, in, out,
in_len - gcm_ctx->tag_len, gcm_ctx->ctr)) {
return 0;
}
} else {
if (!CRYPTO_gcm128_decrypt(&gcm, key, in, out, in_len - gcm_ctx->tag_len)) {
return 0;
}
}
CRYPTO_gcm128_tag(&gcm, tag, gcm_ctx->tag_len);
if (CRYPTO_memcmp(tag, in + plaintext_len, gcm_ctx->tag_len) != 0) {
OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BAD_DECRYPT);
return 0;
}
*out_len = plaintext_len;
return 1;
}
static const EVP_AEAD aead_aes_128_gcm = {
16, /* key len */
12, /* nonce len */
EVP_AEAD_AES_GCM_TAG_LEN, /* overhead */
EVP_AEAD_AES_GCM_TAG_LEN, /* max tag length */
aead_aes_gcm_init,
NULL, /* init_with_direction */
aead_aes_gcm_cleanup,
aead_aes_gcm_seal,
aead_aes_gcm_open,
NULL, /* get_iv */
};
static const EVP_AEAD aead_aes_256_gcm = {
32, /* key len */
12, /* nonce len */
EVP_AEAD_AES_GCM_TAG_LEN, /* overhead */
EVP_AEAD_AES_GCM_TAG_LEN, /* max tag length */
aead_aes_gcm_init,
NULL, /* init_with_direction */
aead_aes_gcm_cleanup,
aead_aes_gcm_seal,
aead_aes_gcm_open,
NULL, /* get_iv */
};
const EVP_AEAD *EVP_aead_aes_128_gcm(void) { return &aead_aes_128_gcm; }
const EVP_AEAD *EVP_aead_aes_256_gcm(void) { return &aead_aes_256_gcm; }
#define EVP_AEAD_AES_CTR_HMAC_SHA256_TAG_LEN SHA256_DIGEST_LENGTH
#define EVP_AEAD_AES_CTR_HMAC_SHA256_NONCE_LEN 12
struct aead_aes_ctr_hmac_sha256_ctx {
union {
double align;
AES_KEY ks;
} ks;
ctr128_f ctr;
block128_f block;
SHA256_CTX inner_init_state;
SHA256_CTX outer_init_state;
uint8_t tag_len;
};
static void hmac_init(SHA256_CTX *out_inner, SHA256_CTX *out_outer,
const uint8_t hmac_key[32]) {
static const size_t hmac_key_len = 32;
uint8_t block[SHA256_CBLOCK];
memcpy(block, hmac_key, hmac_key_len);
memset(block + hmac_key_len, 0x36, sizeof(block) - hmac_key_len);
unsigned i;
for (i = 0; i < hmac_key_len; i++) {
block[i] ^= 0x36;
}
SHA256_Init(out_inner);
SHA256_Update(out_inner, block, sizeof(block));
memset(block + hmac_key_len, 0x5c, sizeof(block) - hmac_key_len);
for (i = 0; i < hmac_key_len; i++) {
block[i] ^= (0x36 ^ 0x5c);
}
SHA256_Init(out_outer);
SHA256_Update(out_outer, block, sizeof(block));
}
static int aead_aes_ctr_hmac_sha256_init(EVP_AEAD_CTX *ctx, const uint8_t *key,
size_t key_len, size_t tag_len) {
struct aead_aes_ctr_hmac_sha256_ctx *aes_ctx;
static const size_t hmac_key_len = 32;
if (key_len < hmac_key_len) {
OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BAD_KEY_LENGTH);
return 0; /* EVP_AEAD_CTX_init should catch this. */
}
const size_t aes_key_len = key_len - hmac_key_len;
if (aes_key_len != 16 && aes_key_len != 32) {
OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BAD_KEY_LENGTH);
return 0; /* EVP_AEAD_CTX_init should catch this. */
}
if (tag_len == EVP_AEAD_DEFAULT_TAG_LENGTH) {
tag_len = EVP_AEAD_AES_CTR_HMAC_SHA256_TAG_LEN;
}
if (tag_len > EVP_AEAD_AES_CTR_HMAC_SHA256_TAG_LEN) {
OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_TAG_TOO_LARGE);
return 0;
}
aes_ctx = OPENSSL_malloc(sizeof(struct aead_aes_ctr_hmac_sha256_ctx));
if (aes_ctx == NULL) {
OPENSSL_PUT_ERROR(CIPHER, ERR_R_MALLOC_FAILURE);
return 0;
}
aes_ctx->ctr =
aes_ctr_set_key(&aes_ctx->ks.ks, NULL, &aes_ctx->block, key, aes_key_len);
aes_ctx->tag_len = tag_len;
hmac_init(&aes_ctx->inner_init_state, &aes_ctx->outer_init_state,
key + aes_key_len);
ctx->aead_state = aes_ctx;
return 1;
}
static void aead_aes_ctr_hmac_sha256_cleanup(EVP_AEAD_CTX *ctx) {
struct aead_aes_ctr_hmac_sha256_ctx *aes_ctx = ctx->aead_state;
OPENSSL_cleanse(aes_ctx, sizeof(struct aead_aes_ctr_hmac_sha256_ctx));
OPENSSL_free(aes_ctx);
}
static void hmac_update_uint64(SHA256_CTX *sha256, uint64_t value) {
unsigned i;
uint8_t bytes[8];
for (i = 0; i < sizeof(bytes); i++) {
bytes[i] = value & 0xff;
value >>= 8;
}
SHA256_Update(sha256, bytes, sizeof(bytes));
}
static void hmac_calculate(uint8_t out[SHA256_DIGEST_LENGTH],
const SHA256_CTX *inner_init_state,
const SHA256_CTX *outer_init_state,
const uint8_t *ad, size_t ad_len,
const uint8_t *nonce, const uint8_t *ciphertext,
size_t ciphertext_len) {
SHA256_CTX sha256;
memcpy(&sha256, inner_init_state, sizeof(sha256));
hmac_update_uint64(&sha256, ad_len);
hmac_update_uint64(&sha256, ciphertext_len);
SHA256_Update(&sha256, nonce, EVP_AEAD_AES_CTR_HMAC_SHA256_NONCE_LEN);
SHA256_Update(&sha256, ad, ad_len);
/* Pad with zeros to the end of the SHA-256 block. */
const unsigned num_padding =
(SHA256_CBLOCK - ((sizeof(uint64_t)*2 +
EVP_AEAD_AES_CTR_HMAC_SHA256_NONCE_LEN + ad_len) %
SHA256_CBLOCK)) %
SHA256_CBLOCK;
uint8_t padding[SHA256_CBLOCK];
memset(padding, 0, num_padding);
SHA256_Update(&sha256, padding, num_padding);
SHA256_Update(&sha256, ciphertext, ciphertext_len);
uint8_t inner_digest[SHA256_DIGEST_LENGTH];
SHA256_Final(inner_digest, &sha256);
memcpy(&sha256, outer_init_state, sizeof(sha256));
SHA256_Update(&sha256, inner_digest, sizeof(inner_digest));
SHA256_Final(out, &sha256);
}
static void aead_aes_ctr_hmac_sha256_crypt(
const struct aead_aes_ctr_hmac_sha256_ctx *aes_ctx, uint8_t *out,
const uint8_t *in, size_t len, const uint8_t *nonce) {
/* Since the AEAD operation is one-shot, keeping a buffer of unused keystream
* bytes is pointless. However, |CRYPTO_ctr128_encrypt| requires it. */
uint8_t partial_block_buffer[AES_BLOCK_SIZE];
unsigned partial_block_offset = 0;
memset(partial_block_buffer, 0, sizeof(partial_block_buffer));
uint8_t counter[AES_BLOCK_SIZE];
memcpy(counter, nonce, EVP_AEAD_AES_CTR_HMAC_SHA256_NONCE_LEN);
memset(counter + EVP_AEAD_AES_CTR_HMAC_SHA256_NONCE_LEN, 0, 4);
if (aes_ctx->ctr) {
CRYPTO_ctr128_encrypt_ctr32(in, out, len, &aes_ctx->ks.ks, counter,
partial_block_buffer, &partial_block_offset,
aes_ctx->ctr);
} else {
CRYPTO_ctr128_encrypt(in, out, len, &aes_ctx->ks.ks, counter,
partial_block_buffer, &partial_block_offset,
aes_ctx->block);
}
}
static int aead_aes_ctr_hmac_sha256_seal(const EVP_AEAD_CTX *ctx, uint8_t *out,
size_t *out_len, size_t max_out_len,
const uint8_t *nonce, size_t nonce_len,
const uint8_t *in, size_t in_len,
const uint8_t *ad, size_t ad_len) {
const struct aead_aes_ctr_hmac_sha256_ctx *aes_ctx = ctx->aead_state;
const uint64_t in_len_64 = in_len;
if (in_len + aes_ctx->tag_len < in_len ||
/* This input is so large it would overflow the 32-bit block counter. */
in_len_64 >= (UINT64_C(1) << 32) * AES_BLOCK_SIZE) {
OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_TOO_LARGE);
return 0;
}
if (max_out_len < in_len + aes_ctx->tag_len) {
OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BUFFER_TOO_SMALL);
return 0;
}
if (nonce_len != EVP_AEAD_AES_CTR_HMAC_SHA256_NONCE_LEN) {
OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_UNSUPPORTED_NONCE_SIZE);
return 0;
}
aead_aes_ctr_hmac_sha256_crypt(aes_ctx, out, in, in_len, nonce);
uint8_t hmac_result[SHA256_DIGEST_LENGTH];
hmac_calculate(hmac_result, &aes_ctx->inner_init_state,
&aes_ctx->outer_init_state, ad, ad_len, nonce, out, in_len);
memcpy(out + in_len, hmac_result, aes_ctx->tag_len);
*out_len = in_len + aes_ctx->tag_len;
return 1;
}
static int aead_aes_ctr_hmac_sha256_open(const EVP_AEAD_CTX *ctx, uint8_t *out,
size_t *out_len, size_t max_out_len,
const uint8_t *nonce, size_t nonce_len,
const uint8_t *in, size_t in_len,
const uint8_t *ad, size_t ad_len) {
const struct aead_aes_ctr_hmac_sha256_ctx *aes_ctx = ctx->aead_state;
size_t plaintext_len;
if (in_len < aes_ctx->tag_len) {
OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BAD_DECRYPT);
return 0;
}
plaintext_len = in_len - aes_ctx->tag_len;
if (max_out_len < plaintext_len) {
OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BUFFER_TOO_SMALL);
return 0;
}
if (nonce_len != EVP_AEAD_AES_CTR_HMAC_SHA256_NONCE_LEN) {
OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_UNSUPPORTED_NONCE_SIZE);
return 0;
}
uint8_t hmac_result[SHA256_DIGEST_LENGTH];
hmac_calculate(hmac_result, &aes_ctx->inner_init_state,
&aes_ctx->outer_init_state, ad, ad_len, nonce, in,
plaintext_len);
if (CRYPTO_memcmp(hmac_result, in + plaintext_len, aes_ctx->tag_len) != 0) {
OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BAD_DECRYPT);
return 0;
}
aead_aes_ctr_hmac_sha256_crypt(aes_ctx, out, in, plaintext_len, nonce);
*out_len = plaintext_len;
return 1;
}
static const EVP_AEAD aead_aes_128_ctr_hmac_sha256 = {
16 /* AES key */ + 32 /* HMAC key */,
12, /* nonce length */
EVP_AEAD_AES_CTR_HMAC_SHA256_TAG_LEN, /* overhead */
EVP_AEAD_AES_CTR_HMAC_SHA256_TAG_LEN, /* max tag length */
aead_aes_ctr_hmac_sha256_init,
NULL /* init_with_direction */,
aead_aes_ctr_hmac_sha256_cleanup,
aead_aes_ctr_hmac_sha256_seal,
aead_aes_ctr_hmac_sha256_open,
NULL /* get_iv */,
};
static const EVP_AEAD aead_aes_256_ctr_hmac_sha256 = {
32 /* AES key */ + 32 /* HMAC key */,
12, /* nonce length */
EVP_AEAD_AES_CTR_HMAC_SHA256_TAG_LEN, /* overhead */
EVP_AEAD_AES_CTR_HMAC_SHA256_TAG_LEN, /* max tag length */
aead_aes_ctr_hmac_sha256_init,
NULL /* init_with_direction */,
aead_aes_ctr_hmac_sha256_cleanup,
aead_aes_ctr_hmac_sha256_seal,
aead_aes_ctr_hmac_sha256_open,
NULL /* get_iv */,
};
const EVP_AEAD *EVP_aead_aes_128_ctr_hmac_sha256(void) {
return &aead_aes_128_ctr_hmac_sha256;
}
const EVP_AEAD *EVP_aead_aes_256_ctr_hmac_sha256(void) {
return &aead_aes_256_ctr_hmac_sha256;
}
#if !defined(OPENSSL_SMALL)
#define EVP_AEAD_AES_GCM_SIV_TAG_LEN 16
struct aead_aes_gcm_siv_ctx {
union {
double align;
AES_KEY ks;
} ks;
block128_f kgk_block;
unsigned is_256:1;
};
static int aead_aes_gcm_siv_init(EVP_AEAD_CTX *ctx, const uint8_t *key,
size_t key_len, size_t tag_len) {
const size_t key_bits = key_len * 8;
if (key_bits != 128 && key_bits != 256) {
OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BAD_KEY_LENGTH);
return 0; /* EVP_AEAD_CTX_init should catch this. */
}
if (tag_len == EVP_AEAD_DEFAULT_TAG_LENGTH) {
tag_len = EVP_AEAD_AES_GCM_SIV_TAG_LEN;
}
if (tag_len != EVP_AEAD_AES_GCM_SIV_TAG_LEN) {
OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_TAG_TOO_LARGE);
return 0;
}
struct aead_aes_gcm_siv_ctx *gcm_siv_ctx =
OPENSSL_malloc(sizeof(struct aead_aes_gcm_siv_ctx));
if (gcm_siv_ctx == NULL) {
return 0;
}
memset(gcm_siv_ctx, 0, sizeof(struct aead_aes_gcm_siv_ctx));
if (aesni_capable()) {
aesni_set_encrypt_key(key, key_len * 8, &gcm_siv_ctx->ks.ks);
gcm_siv_ctx->kgk_block = (block128_f)aesni_encrypt;
} else if (hwaes_capable()) {
aes_hw_set_encrypt_key(key, key_len * 8, &gcm_siv_ctx->ks.ks);
gcm_siv_ctx->kgk_block = (block128_f)aes_hw_encrypt;
} else if (vpaes_capable()) {
vpaes_set_encrypt_key(key, key_len * 8, &gcm_siv_ctx->ks.ks);
gcm_siv_ctx->kgk_block = (block128_f)vpaes_encrypt;
} else {
AES_set_encrypt_key(key, key_len * 8, &gcm_siv_ctx->ks.ks);
gcm_siv_ctx->kgk_block = (block128_f)AES_encrypt;
}
gcm_siv_ctx->is_256 = (key_len == 32);
ctx->aead_state = gcm_siv_ctx;
return 1;
}
static void aead_aes_gcm_siv_cleanup(EVP_AEAD_CTX *ctx) {
struct aead_aes_gcm_siv_ctx *gcm_siv_ctx = ctx->aead_state;
OPENSSL_cleanse(gcm_siv_ctx, sizeof(struct aead_aes_gcm_siv_ctx));
OPENSSL_free(gcm_siv_ctx);
}
/* gcm_siv_crypt encrypts (or decrypts—it's the same thing) |in_len| bytes from
* |in| to |out|, using the block function |enc_block| with |key| in counter
* mode, starting at |initial_counter|. This differs from the traditional
* counter mode code in that the counter is handled little-endian, only the
* first four bytes are used and the GCM-SIV tweak to the final byte is
* applied. The |in| and |out| pointers may be equal but otherwise must not
* alias. */
static void gcm_siv_crypt(uint8_t *out, const uint8_t *in, size_t in_len,
const uint8_t initial_counter[AES_BLOCK_SIZE],
block128_f enc_block, const AES_KEY *key) {
union {
uint32_t w[4];
uint8_t c[16];
} counter;
memcpy(counter.c, initial_counter, AES_BLOCK_SIZE);
counter.c[15] |= 0x80;
for (size_t done = 0; done < in_len;) {
uint8_t keystream[AES_BLOCK_SIZE];
enc_block(counter.c, keystream, key);
counter.w[0]++;
size_t todo = AES_BLOCK_SIZE;
if (in_len - done < todo) {
todo = in_len - done;
}
for (size_t i = 0; i < todo; i++) {
out[done + i] = keystream[i] ^ in[done + i];
}
done += todo;
}
}
/* gcm_siv_polyval evaluates POLYVAL at |auth_key| on the given plaintext and
* AD. The result is written to |out_tag|. */
static void gcm_siv_polyval(uint8_t out_tag[16], const uint8_t *in,
size_t in_len, const uint8_t *ad, size_t ad_len,
const uint8_t auth_key[16]) {
struct polyval_ctx polyval_ctx;
CRYPTO_POLYVAL_init(&polyval_ctx, auth_key);
CRYPTO_POLYVAL_update_blocks(&polyval_ctx, ad, ad_len & ~15);
uint8_t scratch[16];
if (ad_len & 15) {
memset(scratch, 0, sizeof(scratch));
memcpy(scratch, &ad[ad_len & ~15], ad_len & 15);
CRYPTO_POLYVAL_update_blocks(&polyval_ctx, scratch, sizeof(scratch));
}
CRYPTO_POLYVAL_update_blocks(&polyval_ctx, in, in_len & ~15);
if (in_len & 15) {
memset(scratch, 0, sizeof(scratch));
memcpy(scratch, &in[in_len & ~15], in_len & 15);
CRYPTO_POLYVAL_update_blocks(&polyval_ctx, scratch, sizeof(scratch));
}
union {
uint8_t c[16];
struct {
uint64_t ad;
uint64_t in;
} bitlens;
} length_block;
length_block.bitlens.ad = ad_len * 8;
length_block.bitlens.in = in_len * 8;
CRYPTO_POLYVAL_update_blocks(&polyval_ctx, length_block.c,
sizeof(length_block));
CRYPTO_POLYVAL_finish(&polyval_ctx, out_tag);
out_tag[15] &= 0x7f;
}
/* gcm_siv_record_keys contains the keys used for a specific GCM-SIV record. */
struct gcm_siv_record_keys {
uint8_t auth_key[16];
union {
double align;
AES_KEY ks;
} enc_key;
block128_f enc_block;
};
/* gcm_siv_keys calculates the keys for a specific GCM-SIV record with the
* given nonce and writes them to |*out_keys|. */
static void gcm_siv_keys(
const struct aead_aes_gcm_siv_ctx *gcm_siv_ctx,
struct gcm_siv_record_keys *out_keys,
const uint8_t nonce[EVP_AEAD_AES_GCM_SIV_TAG_LEN]) {
const AES_KEY *const key = &gcm_siv_ctx->ks.ks;
gcm_siv_ctx->kgk_block(nonce, out_keys->auth_key, key);
if (gcm_siv_ctx->is_256) {
uint8_t record_enc_key[32];
gcm_siv_ctx->kgk_block(out_keys->auth_key, record_enc_key + 16, key);
gcm_siv_ctx->kgk_block(record_enc_key + 16, record_enc_key, key);
aes_ctr_set_key(&out_keys->enc_key.ks, NULL, &out_keys->enc_block,
record_enc_key, sizeof(record_enc_key));
} else {
uint8_t record_enc_key[16];
gcm_siv_ctx->kgk_block(out_keys->auth_key, record_enc_key, key);
aes_ctr_set_key(&out_keys->enc_key.ks, NULL, &out_keys->enc_block,
record_enc_key, sizeof(record_enc_key));
}
}
static int aead_aes_gcm_siv_seal(const EVP_AEAD_CTX *ctx, uint8_t *out,
size_t *out_len, size_t max_out_len,
const uint8_t *nonce, size_t nonce_len,
const uint8_t *in, size_t in_len,
const uint8_t *ad, size_t ad_len) {
const struct aead_aes_gcm_siv_ctx *gcm_siv_ctx = ctx->aead_state;
const uint64_t in_len_64 = in_len;
const uint64_t ad_len_64 = ad_len;
if (in_len + EVP_AEAD_AES_GCM_SIV_TAG_LEN < in_len ||
in_len_64 > (UINT64_C(1) << 36) ||
ad_len_64 >= (UINT64_C(1) << 61)) {
OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_TOO_LARGE);
return 0;
}
if (max_out_len < in_len + EVP_AEAD_AES_GCM_SIV_TAG_LEN) {
OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BUFFER_TOO_SMALL);
return 0;
}
if (nonce_len != AES_BLOCK_SIZE) {
OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_UNSUPPORTED_NONCE_SIZE);
return 0;
}
struct gcm_siv_record_keys keys;
gcm_siv_keys(gcm_siv_ctx, &keys, nonce);
uint8_t tag[16];
gcm_siv_polyval(tag, in, in_len, ad, ad_len, keys.auth_key);
keys.enc_block(tag, tag, &keys.enc_key.ks);
gcm_siv_crypt(out, in, in_len, tag, keys.enc_block, &keys.enc_key.ks);
memcpy(&out[in_len], tag, EVP_AEAD_AES_GCM_SIV_TAG_LEN);
*out_len = in_len + EVP_AEAD_AES_GCM_SIV_TAG_LEN;
return 1;
}
static int aead_aes_gcm_siv_open(const EVP_AEAD_CTX *ctx, uint8_t *out,
size_t *out_len, size_t max_out_len,
const uint8_t *nonce, size_t nonce_len,
const uint8_t *in, size_t in_len,
const uint8_t *ad, size_t ad_len) {
const uint64_t ad_len_64 = ad_len;
if (ad_len_64 >= (UINT64_C(1) << 61)) {
OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_TOO_LARGE);
return 0;
}
const uint64_t in_len_64 = in_len;
if (in_len < EVP_AEAD_AES_GCM_SIV_TAG_LEN ||
in_len_64 > (UINT64_C(1) << 36) + AES_BLOCK_SIZE) {
OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BAD_DECRYPT);
return 0;
}
const struct aead_aes_gcm_siv_ctx *gcm_siv_ctx = ctx->aead_state;
const size_t plaintext_len = in_len - EVP_AEAD_AES_GCM_SIV_TAG_LEN;
if (max_out_len < plaintext_len) {
OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BUFFER_TOO_SMALL);
return 0;
}
struct gcm_siv_record_keys keys;
gcm_siv_keys(gcm_siv_ctx, &keys, nonce);
gcm_siv_crypt(out, in, plaintext_len, &in[plaintext_len], keys.enc_block,
&keys.enc_key.ks);
uint8_t expected_tag[EVP_AEAD_AES_GCM_SIV_TAG_LEN];
gcm_siv_polyval(expected_tag, out, plaintext_len, ad, ad_len, keys.auth_key);
keys.enc_block(expected_tag, expected_tag, &keys.enc_key.ks);
if (CRYPTO_memcmp(expected_tag, &in[plaintext_len], sizeof(expected_tag)) !=
0) {
OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BAD_DECRYPT);
return 0;
}
*out_len = plaintext_len;
return 1;
}
static const EVP_AEAD aead_aes_128_gcm_siv = {
16, /* key length */
AES_BLOCK_SIZE, /* nonce length */
EVP_AEAD_AES_GCM_SIV_TAG_LEN, /* overhead */
EVP_AEAD_AES_GCM_SIV_TAG_LEN, /* max tag length */
aead_aes_gcm_siv_init,
NULL /* init_with_direction */,
aead_aes_gcm_siv_cleanup,
aead_aes_gcm_siv_seal,
aead_aes_gcm_siv_open,
NULL /* get_iv */,
};
static const EVP_AEAD aead_aes_256_gcm_siv = {
32, /* key length */
AES_BLOCK_SIZE, /* nonce length */
EVP_AEAD_AES_GCM_SIV_TAG_LEN, /* overhead */
EVP_AEAD_AES_GCM_SIV_TAG_LEN, /* max tag length */
aead_aes_gcm_siv_init,
NULL /* init_with_direction */,
aead_aes_gcm_siv_cleanup,
aead_aes_gcm_siv_seal,
aead_aes_gcm_siv_open,
NULL /* get_iv */,
};
const EVP_AEAD *EVP_aead_aes_128_gcm_siv(void) {
return &aead_aes_128_gcm_siv;
}
const EVP_AEAD *EVP_aead_aes_256_gcm_siv(void) {
return &aead_aes_256_gcm_siv;
}
#endif /* !OPENSSL_SMALL */
int EVP_has_aes_hardware(void) {
#if defined(OPENSSL_X86) || defined(OPENSSL_X86_64)
return aesni_capable() && crypto_gcm_clmul_enabled();
#elif defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64)
return hwaes_capable() && CRYPTO_is_ARMv8_PMULL_capable();
#else
return 0;
#endif
}
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