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Diffstat (limited to 'src/crypto/cipher/e_aes.c')
| -rw-r--r-- | src/crypto/cipher/e_aes.c | 1364 |
1 files changed, 1364 insertions, 0 deletions
diff --git a/src/crypto/cipher/e_aes.c b/src/crypto/cipher/e_aes.c new file mode 100644 index 0000000..f92bb8e --- /dev/null +++ b/src/crypto/cipher/e_aes.c @@ -0,0 +1,1364 @@ +/* ==================================================================== + * 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/modes.h> +#include <openssl/obj.h> +#include <openssl/rand.h> + +#include "internal.h" +#include "../modes/internal.h" + +#if defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64) +#include "../arm_arch.h" +#endif + + +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 +extern unsigned int OPENSSL_ia32cap_P[]; + +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)) +#include "../arm_arch.h" + +#if defined(OPENSSL_ARM) && __ARM_ARCH__ >= 7 +#define BSAES +static char bsaes_capable(void) { + return CRYPTO_is_NEON_capable(); +} +#endif + +#define HWAES +static char hwaes_capable(void) { + return (OPENSSL_armcap_P & ARMV8_AES) != 0; +} + +int aes_v8_set_encrypt_key(const uint8_t *user_key, const int bits, + AES_KEY *key); +int aes_v8_set_decrypt_key(const uint8_t *user_key, const int bits, + AES_KEY *key); +void aes_v8_encrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key); +void aes_v8_decrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key); +void aes_v8_cbc_encrypt(const uint8_t *in, uint8_t *out, size_t length, + const AES_KEY *key, uint8_t *ivec, const int enc); +void aes_v8_ctr32_encrypt_blocks(const uint8_t *in, uint8_t *out, size_t len, + const AES_KEY *key, const uint8_t ivec[16]); + +#endif /* OPENSSL_ARM */ + +#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. */ +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(); +} + +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. */ +int vpaes_set_encrypt_key(const uint8_t *userKey, int bits, AES_KEY *key) { + abort(); +} +int vpaes_set_decrypt_key(const uint8_t *userKey, int bits, AES_KEY *key) { + abort(); +} +void vpaes_encrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key) { + abort(); +} +void vpaes_decrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key) { + abort(); +} +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) +/* If HWAES isn't defined then we provide dummy functions for each of the hwaes + * functions. */ +int hwaes_capable(void) { + return 0; +} + +int aes_v8_set_encrypt_key(const uint8_t *user_key, int bits, + AES_KEY *key) { + abort(); +} + +int aes_v8_set_decrypt_key(const uint8_t *user_key, int bits, AES_KEY *key) { + abort(); +} + +void aes_v8_encrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key) { + abort(); +} + +void aes_v8_decrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key) { + abort(); +} + +void aes_v8_cbc_encrypt(const uint8_t *in, uint8_t *out, size_t length, + const AES_KEY *key, uint8_t *ivec, int enc) { + abort(); +} + +void aes_v8_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); + +void aesni_ctr32_encrypt_blocks(const uint8_t *in, uint8_t *out, size_t blocks, + const void *key, const uint8_t *ivec); + +#if defined(OPENSSL_X86_64) +size_t aesni_gcm_encrypt(const uint8_t *in, uint8_t *out, size_t len, + const void *key, uint8_t ivec[16], uint64_t *Xi); +#define AES_gcm_encrypt aesni_gcm_encrypt +size_t aesni_gcm_decrypt(const uint8_t *in, uint8_t *out, size_t len, + const void *key, uint8_t ivec[16], uint64_t *Xi); +#define AES_gcm_decrypt aesni_gcm_decrypt +void gcm_ghash_avx(uint64_t Xi[2], const u128 Htable[16], const uint8_t *in, + size_t len); +#define AES_GCM_ASM(gctx) \ + (gctx->ctr == aesni_ctr32_encrypt_blocks && gctx->gcm.ghash == gcm_ghash_avx) +#endif /* OPENSSL_X86_64 */ + +#else + +/* On other platforms, aesni_capable() will always return false and so the + * following will never be called. */ +void aesni_encrypt(const uint8_t *in, uint8_t *out, const AES_KEY *key) { + abort(); +} +int aesni_set_encrypt_key(const uint8_t *userKey, int bits, AES_KEY *key) { + abort(); +} +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_v8_set_decrypt_key(key, ctx->key_len * 8, &dat->ks.ks); + dat->block = (block128_f)aes_v8_decrypt; + dat->stream.cbc = NULL; + if (mode == EVP_CIPH_CBC_MODE) { + dat->stream.cbc = (cbc128_f)aes_v8_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_v8_set_encrypt_key(key, ctx->key_len * 8, &dat->ks.ks); + dat->block = (block128_f)aes_v8_encrypt; + dat->stream.cbc = NULL; + if (mode == EVP_CIPH_CBC_MODE) { + dat->stream.cbc = (cbc128_f)aes_v8_cbc_encrypt; + } else if (mode == EVP_CIPH_CTR_MODE) { + dat->stream.ctr = (ctr128_f)aes_v8_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, aes_init_key, CIPHER_R_AES_KEY_SETUP_FAILED); + return 0; + } + + return 1; +} + +static int aes_cbc_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, + const unsigned char *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, unsigned char *out, + const unsigned char *in, size_t len) { + size_t bl = ctx->cipher->block_size; + size_t i; + EVP_AES_KEY *dat = (EVP_AES_KEY *)ctx->cipher_data; + + if (len < bl) { + return 1; + } + + for (i = 0, len -= bl; i <= len; i += bl) { + (*dat->block)(in + i, out + i, &dat->ks); + } + + return 1; +} + +static int aes_ctr_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, + const unsigned char *in, size_t len) { + unsigned int num = ctx->num; + 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, &num, + dat->stream.ctr); + } else { + CRYPTO_ctr128_encrypt(in, out, len, &dat->ks, ctx->iv, ctx->buf, &num, + dat->block); + } + ctx->num = (size_t)num; + return 1; +} + +static ctr128_f aes_gcm_set_key(AES_KEY *aes_key, GCM128_CONTEXT *gcm_ctx, + const uint8_t *key, size_t key_len) { + if (hwaes_capable()) { + aes_v8_set_encrypt_key(key, key_len * 8, aes_key); + CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)aes_v8_encrypt); + return (ctr128_f)aes_v8_ctr32_encrypt_blocks; + } + + if (bsaes_capable()) { + AES_set_encrypt_key(key, key_len * 8, aes_key); + CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)AES_encrypt); + return (ctr128_f)bsaes_ctr32_encrypt_blocks; + } + + if (vpaes_capable()) { + vpaes_set_encrypt_key(key, key_len * 8, aes_key); + CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)vpaes_encrypt); + return NULL; + } + + AES_set_encrypt_key(key, key_len * 8, aes_key); + CRYPTO_gcm128_init(gcm_ctx, aes_key, (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_gcm_set_key(&gctx->ks.ks, &gctx->gcm, 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, 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, iv, gctx->ivlen); + } else { + memcpy(gctx->iv, iv, gctx->ivlen); + } + gctx->iv_set = 1; + gctx->iv_gen = 0; + } + return 1; +} + +static int 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); + } + return 1; +} + +/* 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->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->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->gcm.key) { + if (gctx->gcm.key != &gctx->ks) { + return 0; + } + gctx_out->gcm.key = &gctx_out->ks; + } + 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) { + size_t bulk = 0; +#if defined(AES_GCM_ASM) + if (len >= 32 && AES_GCM_ASM(gctx)) { + size_t res = (16 - gctx->gcm.mres) % 16; + + if (!CRYPTO_gcm128_encrypt(&gctx->gcm, in, out, res)) { + return -1; + } + + bulk = AES_gcm_encrypt(in + res, out + res, len - res, gctx->gcm.key, + gctx->gcm.Yi.c, gctx->gcm.Xi.u); + gctx->gcm.len.u[1] += bulk; + bulk += res; + } +#endif + if (!CRYPTO_gcm128_encrypt_ctr32(&gctx->gcm, in + bulk, out + bulk, + len - bulk, gctx->ctr)) { + return -1; + } + } else { + size_t bulk = 0; + if (!CRYPTO_gcm128_encrypt(&gctx->gcm, in + bulk, out + bulk, + len - bulk)) { + return -1; + } + } + } else { + if (gctx->ctr) { + size_t bulk = 0; +#if defined(AES_GCM_ASM) + if (len >= 16 && AES_GCM_ASM(gctx)) { + size_t res = (16 - gctx->gcm.mres) % 16; + + if (!CRYPTO_gcm128_decrypt(&gctx->gcm, in, out, res)) { + return -1; + } + + bulk = AES_gcm_decrypt(in + res, out + res, len - res, gctx->gcm.key, + gctx->gcm.Yi.c, gctx->gcm.Xi.u); + gctx->gcm.len.u[1] += bulk; + bulk += res; + } +#endif + if (!CRYPTO_gcm128_decrypt_ctr32(&gctx->gcm, in + bulk, out + bulk, + len - bulk, gctx->ctr)) { + return -1; + } + } else { + size_t bulk = 0; + if (!CRYPTO_gcm128_decrypt(&gctx->gcm, in + bulk, out + bulk, + len - bulk)) { + return -1; + } + } + } + return len; + } else { + if (!ctx->encrypt) { + if (gctx->taglen < 0 || + !CRYPTO_gcm128_finish(&gctx->gcm, ctx->buf, gctx->taglen) != 0) { + 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_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_256_cbc = { + NID_aes_128_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_128_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_128_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_gcm = { + NID_aes_128_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, aesni_init_key, 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, 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, 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_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_256_cbc = { + NID_aes_128_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_128_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_128_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_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, gcm) + +EVP_CIPHER_FUNCTION(256, cbc) +EVP_CIPHER_FUNCTION(256, ctr) +EVP_CIPHER_FUNCTION(256, ecb) +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, aead_aes_gcm_init, 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, aead_aes_gcm_init, CIPHER_R_TAG_TOO_LARGE); + return 0; + } + + gcm_ctx = OPENSSL_malloc(sizeof(struct aead_aes_gcm_ctx)); + if (gcm_ctx == NULL) { + return 0; + } + + if (aesni_capable()) { + aesni_set_encrypt_key(key, key_len * 8, &gcm_ctx->ks.ks); + CRYPTO_gcm128_init(&gcm_ctx->gcm, &gcm_ctx->ks.ks, + (block128_f)aesni_encrypt); + gcm_ctx->ctr = (ctr128_f)aesni_ctr32_encrypt_blocks; + } else { + gcm_ctx->ctr = + aes_gcm_set_key(&gcm_ctx->ks.ks, &gcm_ctx->gcm, 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) { + size_t bulk = 0; + 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, aead_aes_gcm_seal, CIPHER_R_TOO_LARGE); + return 0; + } + + if (max_out_len < in_len + gcm_ctx->tag_len) { + OPENSSL_PUT_ERROR(CIPHER, aead_aes_gcm_seal, CIPHER_R_BUFFER_TOO_SMALL); + return 0; + } + + memcpy(&gcm, &gcm_ctx->gcm, sizeof(gcm)); + CRYPTO_gcm128_setiv(&gcm, 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, in + bulk, out + bulk, in_len - bulk, + gcm_ctx->ctr)) { + return 0; + } + } else { + if (!CRYPTO_gcm128_encrypt(&gcm, in + bulk, out + bulk, in_len - bulk)) { + 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) { + size_t bulk = 0; + 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, aead_aes_gcm_open, CIPHER_R_BAD_DECRYPT); + return 0; + } + + plaintext_len = in_len - gcm_ctx->tag_len; + + if (max_out_len < plaintext_len) { + OPENSSL_PUT_ERROR(CIPHER, aead_aes_gcm_open, CIPHER_R_BUFFER_TOO_SMALL); + return 0; + } + + memcpy(&gcm, &gcm_ctx->gcm, sizeof(gcm)); + CRYPTO_gcm128_setiv(&gcm, nonce, nonce_len); + + if (!CRYPTO_gcm128_aad(&gcm, ad, ad_len)) { + return 0; + } + + if (gcm_ctx->ctr) { + if (!CRYPTO_gcm128_decrypt_ctr32(&gcm, in + bulk, out + bulk, + in_len - bulk - gcm_ctx->tag_len, + gcm_ctx->ctr)) { + return 0; + } + } else { + if (!CRYPTO_gcm128_decrypt(&gcm, in + bulk, out + bulk, + in_len - bulk - 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, aead_aes_gcm_open, 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, aead_aes_gcm_cleanup, + aead_aes_gcm_seal, aead_aes_gcm_open, +}; + +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, aead_aes_gcm_cleanup, + aead_aes_gcm_seal, aead_aes_gcm_open, +}; + +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; } + + +/* AES Key Wrap is specified in + * http://csrc.nist.gov/groups/ST/toolkit/documents/kms/key-wrap.pdf + * or https://tools.ietf.org/html/rfc3394 */ + +struct aead_aes_key_wrap_ctx { + uint8_t key[32]; + unsigned key_bits; +}; + +static int aead_aes_key_wrap_init(EVP_AEAD_CTX *ctx, const uint8_t *key, + size_t key_len, size_t tag_len) { + struct aead_aes_key_wrap_ctx *kw_ctx; + const size_t key_bits = key_len * 8; + + if (key_bits != 128 && key_bits != 256) { + OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_init, CIPHER_R_BAD_KEY_LENGTH); + return 0; /* EVP_AEAD_CTX_init should catch this. */ + } + + if (tag_len == EVP_AEAD_DEFAULT_TAG_LENGTH) { + tag_len = 8; + } + + if (tag_len != 8) { + OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_init, + CIPHER_R_UNSUPPORTED_TAG_SIZE); + return 0; + } + + kw_ctx = OPENSSL_malloc(sizeof(struct aead_aes_key_wrap_ctx)); + if (kw_ctx == NULL) { + OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_init, ERR_R_MALLOC_FAILURE); + return 0; + } + + memcpy(kw_ctx->key, key, key_len); + kw_ctx->key_bits = key_bits; + + ctx->aead_state = kw_ctx; + return 1; +} + +static void aead_aes_key_wrap_cleanup(EVP_AEAD_CTX *ctx) { + struct aead_aes_key_wrap_ctx *kw_ctx = ctx->aead_state; + OPENSSL_cleanse(kw_ctx, sizeof(struct aead_aes_key_wrap_ctx)); + OPENSSL_free(kw_ctx); +} + +/* kDefaultAESKeyWrapNonce is the default nonce value given in 2.2.3.1. */ +static const uint8_t kDefaultAESKeyWrapNonce[8] = {0xa6, 0xa6, 0xa6, 0xa6, + 0xa6, 0xa6, 0xa6, 0xa6}; + + +static int aead_aes_key_wrap_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_key_wrap_ctx *kw_ctx = ctx->aead_state; + union { + double align; + AES_KEY ks; + } ks; + /* Variables in this function match up with the variables in the second half + * of section 2.2.1. */ + unsigned i, j, n; + uint8_t A[AES_BLOCK_SIZE]; + + if (ad_len != 0) { + OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_seal, + CIPHER_R_UNSUPPORTED_AD_SIZE); + return 0; + } + + if (nonce_len == 0) { + nonce = kDefaultAESKeyWrapNonce; + nonce_len = sizeof(kDefaultAESKeyWrapNonce); + } + + if (nonce_len != 8) { + OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_seal, + CIPHER_R_UNSUPPORTED_NONCE_SIZE); + return 0; + } + + if (in_len % 8 != 0) { + OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_seal, + CIPHER_R_UNSUPPORTED_INPUT_SIZE); + return 0; + } + + /* The code below only handles a 32-bit |t| thus 6*|n| must be less than + * 2^32, where |n| is |in_len| / 8. So in_len < 4/3 * 2^32 and we + * conservatively cap it to 2^32-16 to stop 32-bit platforms complaining that + * a comparison is always true. */ + if (in_len > 0xfffffff0) { + OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_seal, CIPHER_R_TOO_LARGE); + return 0; + } + + n = in_len / 8; + + if (n < 2) { + OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_seal, + CIPHER_R_UNSUPPORTED_INPUT_SIZE); + return 0; + } + + if (in_len + 8 < in_len) { + OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_seal, CIPHER_R_TOO_LARGE); + return 0; + } + + if (max_out_len < in_len + 8) { + OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_seal, + CIPHER_R_BUFFER_TOO_SMALL); + return 0; + } + + if (AES_set_encrypt_key(kw_ctx->key, kw_ctx->key_bits, &ks.ks) < 0) { + OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_seal, + CIPHER_R_AES_KEY_SETUP_FAILED); + return 0; + } + + memmove(out + 8, in, in_len); + memcpy(A, nonce, 8); + + for (j = 0; j < 6; j++) { + for (i = 1; i <= n; i++) { + uint32_t t; + + memcpy(A + 8, out + 8 * i, 8); + AES_encrypt(A, A, &ks.ks); + t = n * j + i; + A[7] ^= t & 0xff; + A[6] ^= (t >> 8) & 0xff; + A[5] ^= (t >> 16) & 0xff; + A[4] ^= (t >> 24) & 0xff; + memcpy(out + 8 * i, A + 8, 8); + } + } + + memcpy(out, A, 8); + *out_len = in_len + 8; + return 1; +} + +static int aead_aes_key_wrap_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_key_wrap_ctx *kw_ctx = ctx->aead_state; + union { + double align; + AES_KEY ks; + } ks; + /* Variables in this function match up with the variables in the second half + * of section 2.2.1. */ + unsigned i, j, n; + uint8_t A[AES_BLOCK_SIZE]; + + if (ad_len != 0) { + OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_open, + CIPHER_R_UNSUPPORTED_AD_SIZE); + return 0; + } + + if (nonce_len == 0) { + nonce = kDefaultAESKeyWrapNonce; + nonce_len = sizeof(kDefaultAESKeyWrapNonce); + } + + if (nonce_len != 8) { + OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_open, + CIPHER_R_UNSUPPORTED_NONCE_SIZE); + return 0; + } + + if (in_len % 8 != 0) { + OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_open, + CIPHER_R_UNSUPPORTED_INPUT_SIZE); + return 0; + } + + /* The code below only handles a 32-bit |t| thus 6*|n| must be less than + * 2^32, where |n| is |in_len| / 8. So in_len < 4/3 * 2^32 and we + * conservatively cap it to 2^32-8 to stop 32-bit platforms complaining that + * a comparison is always true. */ + if (in_len > 0xfffffff8) { + OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_open, CIPHER_R_TOO_LARGE); + return 0; + } + + if (in_len < 24) { + OPENSSL_PUT_ERROR(CIPHER, aead_aes_gcm_open, CIPHER_R_BAD_DECRYPT); + return 0; + } + + n = (in_len / 8) - 1; + + if (max_out_len < in_len - 8) { + OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_open, + CIPHER_R_BUFFER_TOO_SMALL); + return 0; + } + + if (AES_set_decrypt_key(kw_ctx->key, kw_ctx->key_bits, &ks.ks) < 0) { + OPENSSL_PUT_ERROR(CIPHER, aead_aes_key_wrap_open, + CIPHER_R_AES_KEY_SETUP_FAILED); + return 0; + } + + memcpy(A, in, 8); + memmove(out, in + 8, in_len - 8); + + for (j = 5; j < 6; j--) { + for (i = n; i > 0; i--) { + uint32_t t; + + t = n * j + i; + A[7] ^= t & 0xff; + A[6] ^= (t >> 8) & 0xff; + A[5] ^= (t >> 16) & 0xff; + A[4] ^= (t >> 24) & 0xff; + memcpy(A + 8, out + 8 * (i - 1), 8); + AES_decrypt(A, A, &ks.ks); + memcpy(out + 8 * (i - 1), A + 8, 8); + } + } + + if (CRYPTO_memcmp(A, nonce, 8) != 0) { + OPENSSL_PUT_ERROR(CIPHER, aead_aes_gcm_open, CIPHER_R_BAD_DECRYPT); + return 0; + } + + *out_len = in_len - 8; + return 1; +} + +static const EVP_AEAD aead_aes_128_key_wrap = { + 16, /* key len */ + 8, /* nonce len */ + 8, /* overhead */ + 8, /* max tag length */ + aead_aes_key_wrap_init, aead_aes_key_wrap_cleanup, + aead_aes_key_wrap_seal, aead_aes_key_wrap_open, +}; + +static const EVP_AEAD aead_aes_256_key_wrap = { + 32, /* key len */ + 8, /* nonce len */ + 8, /* overhead */ + 8, /* max tag length */ + aead_aes_key_wrap_init, aead_aes_key_wrap_cleanup, + aead_aes_key_wrap_seal, aead_aes_key_wrap_open, +}; + +const EVP_AEAD *EVP_aead_aes_128_key_wrap(void) { return &aead_aes_128_key_wrap; } + +const EVP_AEAD *EVP_aead_aes_256_key_wrap(void) { return &aead_aes_256_key_wrap; } + +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() && (OPENSSL_armcap_P & ARMV8_PMULL); +#else + return 0; +#endif +} |