| /* ==================================================================== |
| * 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 <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" |
| |
| |
| 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() { |
| return (OPENSSL_ia32cap_P[1] & (1 << (41 - 32))) != 0; |
| } |
| |
| #if defined(OPENSSL_X86_64) |
| #define BSAES |
| static char bsaes_capable() { |
| return vpaes_capable(); |
| } |
| #endif |
| |
| #elif !defined(OPENSSL_NO_ASM) && defined(OPENSSL_ARM) |
| #include "../arm_arch.h" |
| #if __ARM_ARCH__ >= 7 |
| #define BSAES |
| static char bsaes_capable() { |
| return CRYPTO_is_NEON_capable(); |
| } |
| #endif /* __ARM_ARCH__ >= 7 */ |
| #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() { |
| 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() { |
| 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(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 (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 (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 (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_pseudo_bytes(gctx->iv + arg, gctx->ivlen - arg) <= 0) { |
| 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 */, |
| 16 /* 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 */, |
| 16 /* 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() { |
| 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 */, |
| 16 /* 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 */, |
| 16 /* 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() { |
| 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() { return &aead_aes_128_gcm; } |
| |
| const EVP_AEAD *EVP_aead_aes_256_gcm() { 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 comparision 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 comparision 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() { return &aead_aes_128_key_wrap; } |
| |
| const EVP_AEAD *EVP_aead_aes_256_key_wrap() { return &aead_aes_256_key_wrap; } |