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Thu, 6 Aug 2026 15:13:04 +0000 (GMT) From: Harald Freudenberger To: richard.henderson@linaro.org, iii@linux.ibm.com, david@kernel.org, thuth@redhat.com, berrange@redhat.com Cc: qemu-s390x@nongnu.org, qemu-devel@nongnu.org, linux-s390@vger.kernel.org, dengler@linux.ibm.com, borntraeger@linux.ibm.com, fcallies@linux.ibm.com, cohuck@redhat.com Subject: [PATCH v14 06/19] crypto: Add aes-helpers file to support some AES modes Date: Thu, 6 Aug 2026 17:12:48 +0200 Message-ID: <20260806151302.26846-7-freude@linux.ibm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260806151302.26846-1-freude@linux.ibm.com> References: <20260806151302.26846-1-freude@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=E6P9Y6dl c=1 sm=1 tr=0 ts=6a74a485 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=20KFwNOVAAAA:8 a=zkwM-tl61wuaHISZUgYA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-ORIG-GUID: 62NeBkrZABbdPN0nasdkjCxEgYboMoA6 X-Proofpoint-GUID: 62NeBkrZABbdPN0nasdkjCxEgYboMoA6 X-Proofpoint-Spam-Info: AW1haW4tMjYwODA2MDExNSBTYWx0ZWRfXw/GGm9Tjahx/ rsxn09fJzdqtDHU10Gs08vQ4w7ZT6y9tode1OD2WARMO8w7oEdyKRyjOT820UKXwEJm98ab5gCz 0w6SrKXV77bpDXCwwx1ULpc8Ya7acTY= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODA2MDExNSBTYWx0ZWRfX7z6Gyi1qZ48E 9i25l2aRgQhtcDGmZ7yNApOJiehhWEBaCR90kMOpQWdc4dndySgKz+XBqW8rD9ahln9zXzu1yWu l3uhBcsRnc2TE0m39/82K/fOR/ByKHtYOMAD4nQb/DFneUlvTa3dzuI11m9Nl8sD7ZVEZwpDxeF nX22NC5fhy9dUOS3rvinw16pW3TpJq8CrgYY4aU8PafXVGLOcBjAu/yUTU7/GD7un9P+0dMGUBu yl4UsHKg+rdvapMZH2beI5RiM6RebtknU8zj5W1YLoR7YFhImE15E/JLLs/J2j2zkbPLUbmvrrU +5HufIAzmjVRuQP3M+BIB4qjrVghh39wI913jmiK3Z0xPTESeOBZbJ/DinbidXyLAhrKnzS5eX2 u4wSfrgxE1iIcbagzQBoiYszC0xKkWGp92opLPkTz85JsPc33mKavh+ENdcUcBL3GkMPTnnK/kW mn2fw0HFInG09gEB99Q== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-06_01,2026-08-05_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 clxscore=1015 lowpriorityscore=0 priorityscore=1501 suspectscore=0 adultscore=0 spamscore=0 malwarescore=0 impostorscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608060115 Add a new file crypto/aes-helpers.c with simple functions to support some AES modes: - AES cbc: AES_cbc_encrypt() AES_cbc_decrypt() - AES ctr: AES_ctr_encrypt() - AES xts: AES_xts_encrypt() AES_xts_decrypt() and some AES related helpers: - AES_xor() - AES_xts_prep_next_tweak() Add header file include/crypto/aes-helpers.h for these functions Signed-off-by: Harald Freudenberger Reviewed-by: Finn Callies Reviewed-by: Ilya Leoshkevich Reviewed-by: Daniel P. Berrangé Acked-by: Daniel P. Berrangé --- crypto/aes-helpers.c | 106 ++++++++++++++++++++++++++++++++++ crypto/meson.build | 1 + include/crypto/aes-helpers.h | 109 +++++++++++++++++++++++++++++++++++ 3 files changed, 216 insertions(+) create mode 100644 crypto/aes-helpers.c create mode 100644 include/crypto/aes-helpers.h diff --git a/crypto/aes-helpers.c b/crypto/aes-helpers.c new file mode 100644 index 0000000000..68d848683c --- /dev/null +++ b/crypto/aes-helpers.c @@ -0,0 +1,106 @@ +/* + * SPDX-License-Identifier: GPL-2.0-or-later + * + * AES helper functions and mode implementations + * + * Authors: + * Harald Freudenberger + */ + +#include "qemu/osdep.h" +#include "crypto/aes.h" +#include "crypto/aes-helpers.h" + +void AES_xor(const unsigned char *src1, const unsigned char *src2, + unsigned char *dst) +{ + int i; + + for (i = 0; i < AES_BLOCK_SIZE; i++) { + dst[i] = src1[i] ^ src2[i]; + } +} + +void AES_cbc_encrypt(const unsigned char *in, unsigned char *out, + unsigned char *iv, const AES_KEY *key) +{ + unsigned char buf[AES_BLOCK_SIZE]; + + /* in xor iv => buf */ + AES_xor(in, iv, buf); + /* encrypt buf => out */ + AES_encrypt(buf, out, key); + /* prep iv for next round */ + memcpy(iv, out, AES_BLOCK_SIZE); +} + +void AES_cbc_decrypt(const unsigned char *in, unsigned char *out, + unsigned char *iv, const AES_KEY *key) +{ + unsigned char buf[AES_BLOCK_SIZE]; + + /* decrypt in => buf */ + AES_decrypt(in, buf, key); + /* buf xor iv => out */ + AES_xor(buf, iv, out); + /* prep iv for next round */ + memcpy(iv, in, AES_BLOCK_SIZE); +} + +void AES_ctr_encrypt(const unsigned char *in, unsigned char *out, + const unsigned char *ctr, const AES_KEY *key) +{ + unsigned char buf[AES_BLOCK_SIZE]; + + /* encrypt ctr => buf */ + AES_encrypt(ctr, buf, key); + /* exor input data with encrypted ctr => out */ + AES_xor(in, buf, out); +} + +/* + * Tweak calculation for AES XTS. + * Multiply tweak by α (x) in GF(2^128) per IEEE 1619-2007. The tweak + * is a 128-bit little-endian integer (tweak[0]=LSB, tweak[15]=MSB). + * This implementation has been verified on little and big endian. + */ +void AES_xts_prep_next_tweak(unsigned char *tweak) +{ + unsigned char carry; + int i; + + carry = tweak[AES_BLOCK_SIZE - 1] >> 7; + + for (i = AES_BLOCK_SIZE - 1; i > 0; i--) { + tweak[i] = (unsigned char)((tweak[i] << 1) | (tweak[i - 1] >> 7)); + } + + tweak[i] = (unsigned char)(tweak[i] << 1); + tweak[i] ^= (unsigned char)(0x87 & (unsigned char)(-(unsigned char)carry)); +} + +void AES_xts_encrypt(const unsigned char *in, unsigned char *out, + const unsigned char *tweak, const AES_KEY *key) +{ + unsigned char buf1[AES_BLOCK_SIZE], buf2[AES_BLOCK_SIZE]; + + /* in xor tweak => buf1 */ + AES_xor(in, tweak, buf1); + /* encrypt buf1 => buf2 */ + AES_encrypt(buf1, buf2, key); + /* buf2 xor tweak => out */ + AES_xor(buf2, tweak, out); +} + +void AES_xts_decrypt(const unsigned char *in, unsigned char *out, + const unsigned char *tweak, const AES_KEY *key) +{ + unsigned char buf1[AES_BLOCK_SIZE], buf2[AES_BLOCK_SIZE]; + + /* in xor tweak => buf1 */ + AES_xor(in, tweak, buf1); + /* encrypt buf1 => buf2 */ + AES_decrypt(buf1, buf2, key); + /* buf2 xor tweak => out */ + AES_xor(buf2, tweak, out); +} diff --git a/crypto/meson.build b/crypto/meson.build index 6ac83857aa..534b995c9b 100644 --- a/crypto/meson.build +++ b/crypto/meson.build @@ -55,6 +55,7 @@ system_ss.add(when: gnutls, if_true: files('tls-cipher-suites.c')) util_ss.add(files( 'aes.c', + 'aes-helpers.c', 'clmul.c', 'init.c', 'sm4.c', diff --git a/include/crypto/aes-helpers.h b/include/crypto/aes-helpers.h new file mode 100644 index 0000000000..9a94c48d86 --- /dev/null +++ b/include/crypto/aes-helpers.h @@ -0,0 +1,109 @@ +/* + * SPDX-License-Identifier: GPL-2.0-or-later + * + * AES helper functions and modes + */ + +#ifndef QEMU_AES_HELPERS_H +#define QEMU_AES_HELPERS_H + +/** + * AES_xor: + * @src1: first source buffer of AES_BLOCK_SIZE bytes + * @src2: second source buffer of AES_BLOCK_SIZE bytes + * @dst: destination buffer of AES_BLOCK_SIZE bytes + * + * Bitwise XOR operation between two AES blocks. + */ +void AES_xor(const unsigned char *src1, const unsigned char *src2, + unsigned char *dst); + +/** + * AES_cbc_encrypt: + * @in: input plaintext block of AES_BLOCK_SIZE bytes + * @out: output ciphertext block of AES_BLOCK_SIZE bytes + * @iv: IV, updated after processing for chaining + * @key: AES key + * + * Single block AES encrypt in CBC (Cipher Block Chaining) mode. + * The input block is XORed with the IV, then encrypted with AES. + * IV is updated at the end and is prepared for the next invocation. + */ +void AES_cbc_encrypt(const unsigned char *in, unsigned char *out, + unsigned char *iv, const AES_KEY *key); + +/** + * AES_cbc_decrypt: + * @in: input ciphertext block of AES_BLOCK_SIZE bytes + * @out: output plaintext block of AES_BLOCK_SIZE bytes + * @iv: initialization vector, updated to input block for chaining + * @key: AES key + * + * Single block AES decrypt in CBC (Cipher Block Chaining) mode. + * The input block is decrypted, then XORed with the IV. + * IV is updated at the end and is prepared for the next invocation. + */ +void AES_cbc_decrypt(const unsigned char *in, unsigned char *out, + unsigned char *iv, const AES_KEY *key); + +/** + * AES_ctr_encrypt: + * @in: input data block of AES_BLOCK_SIZE bytes + * @out: output data block of AES_BLOCK_SIZE bytes + * @ctr: counter value of AES_BLOCK_SIZE bytes + * @key: AES key + * + * Single block AES encrypt/decrypt in CTR (Counter) mode. + * The counter block is encrypted, then XORed with the + * input data block. + * In CTR mode encrypt and decrypt are identical operations. + * Note that the caller is responsible for incrementing the + * counter block. + */ +void AES_ctr_encrypt(const unsigned char *in, unsigned char *out, + const unsigned char *ctr, const AES_KEY *key); + +/** + * AES_xts_prep_next_tweak: + * @tweak: pointer to tweak value to be updated (16 bytes buffer + * containing a 128 bit little endian integer) + * + * Tweak calculation for AES XTS. + * Prepares the next tweak value for AES-XTS mode by multiplying + * the current tweak by α (x) in GF(2^128) according to IEEE 1619-2007. + */ +void AES_xts_prep_next_tweak(unsigned char *tweak); + +/** + * AES_xts_encrypt: + * @in: input plaintext block of AES_BLOCK_SIZE bytes + * @out: output ciphertext block of AES_BLOCK_SIZE bytes + * @tweak: tweak value (16 bytes) + * @key: AES key + * + * Single block AES encrypt in XTS mode. + * The input is XORed with the tweak, encrypted, then XORed with + * the tweak again to produce the output. + * Note that the caller is responsible for managing the tweak value. + * Use AES_xts_prep_next_tweak() to advance the tweak for the next block. + */ +void AES_xts_encrypt(const unsigned char *in, unsigned char *out, + const unsigned char *tweak, const AES_KEY *key); + +/** + * AES_xts_decrypt: + * @in: input ciphertext block of AES_BLOCK_SIZE bytes + * @out: output plaintext block of AES_BLOCK_SIZE bytes + * @tweak: tweak value (16 bytes) + * @key: AES key + * + * Single block AES decrypt in XTS mode. + * The input is XORed with the tweak, decrypted, then XORed with + * the tweak again to produce the output. + * Note that the caller is responsible for managing the tweak value. + * Use AES_xts_prep_next_tweak() to advance the tweak for the next block. + */ +void AES_xts_decrypt(const unsigned char *in, unsigned char *out, + const unsigned char *tweak, const AES_KEY *key); + +#endif -- 2.43.0