mirror/openssl
2
0
Fork 0
mirror of https://github.com/openssl/openssl.git synced 2024-12-15 06:01:37 +08:00
Code Issues Packages Projects Releases Wiki Activity

Refactor cipher aes_cts code so that it can be used by other 128bit ciphers

Browse Source 
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/16286)
This commit is contained in:
Shane Lontis 2021-08-12 18:20:48 +10:00 committed by Pauli
parent 43cf27c9a4
commit 42281f2617
5 changed files with 110 additions and 109 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
providers/implementations/ciphers/build.info
View File

@ -47,7 +47,7 @@ SOURCE[$AES_GOAL]=\
cipher_aes_wrp.c \ cipher_aes_wrp.c \
cipher_aes_cbc_hmac_sha.c \ cipher_aes_cbc_hmac_sha.c \
cipher_aes_cbc_hmac_sha256_hw.c cipher_aes_cbc_hmac_sha1_hw.c \ cipher_aes_cbc_hmac_sha256_hw.c cipher_aes_cbc_hmac_sha1_hw.c \
cipher_aes_cts.c cipher_cts.c
# Extra code to satisfy the FIPS and non-FIPS separation. # Extra code to satisfy the FIPS and non-FIPS separation.
# When the AES-xxx-XTS moves to legacy, cipher_aes_xts_fips.c can be removed. # When the AES-xxx-XTS moves to legacy, cipher_aes_xts_fips.c can be removed.

16
providers/implementations/ciphers/cipher_aes_cts.h
View File

@ -1,16 +0,0 @@
/*
* Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include "crypto/evp.h"
OSSL_FUNC_cipher_update_fn ossl_aes_cbc_cts_block_update;
OSSL_FUNC_cipher_final_fn ossl_aes_cbc_cts_block_final;
const char *ossl_aes_cbc_cts_mode_id2name(unsigned int id);
int ossl_aes_cbc_cts_mode_name2id(const char *name);

50
providers/implementations/ciphers/cipher_aes_cts.inc
View File

@ -10,9 +10,9 @@
/* Dispatch functions for AES CBC CTS ciphers */ /* Dispatch functions for AES CBC CTS ciphers */
#include <openssl/proverr.h> #include <openssl/proverr.h>
#include "cipher_aes_cts.h" #include "cipher_cts.h"
#define AES_CTS_FLAGS PROV_CIPHER_FLAG_CTS #define CTS_FLAGS PROV_CIPHER_FLAG_CTS
static OSSL_FUNC_cipher_encrypt_init_fn aes_cbc_cts_einit; static OSSL_FUNC_cipher_encrypt_init_fn aes_cbc_cts_einit;
static OSSL_FUNC_cipher_decrypt_init_fn aes_cbc_cts_dinit; static OSSL_FUNC_cipher_decrypt_init_fn aes_cbc_cts_dinit;
@ -50,7 +50,7 @@ static int aes_cbc_cts_get_ctx_params(void *vctx, OSSL_PARAM params[])
p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_CTS_MODE); p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_CTS_MODE);
if (p != NULL) { if (p != NULL) {
const char *name = ossl_aes_cbc_cts_mode_id2name(ctx->cts_mode); const char *name = ossl_cipher_cbc_cts_mode_id2name(ctx->cts_mode);
if (name == NULL || !OSSL_PARAM_set_utf8_string(p, name)) { if (name == NULL || !OSSL_PARAM_set_utf8_string(p, name)) {
ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER); ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
@ -74,7 +74,7 @@ static int aes_cbc_cts_set_ctx_params(void *vctx, const OSSL_PARAM params[])
if (p != NULL) { if (p != NULL) {
if (p->data_type != OSSL_PARAM_UTF8_STRING) if (p->data_type != OSSL_PARAM_UTF8_STRING)
goto err; goto err;
id = ossl_aes_cbc_cts_mode_name2id(p->data); id = ossl_cipher_cbc_cts_mode_name2id(p->data);
if (id < 0) if (id < 0)
goto err; goto err;
@ -86,45 +86,9 @@ err:
return 0; return 0;
} }
/* NOTE: The underlying block cipher is AES CBC so we reuse most of the code */
#define IMPLEMENT_cts_cipher(alg, UCALG, lcmode, UCMODE, flags, kbits, \
blkbits, ivbits, typ) \
static OSSL_FUNC_cipher_get_params_fn alg##_##kbits##_##lcmode##_get_params; \
static int alg##_cts_##kbits##_##lcmode##_get_params(OSSL_PARAM params[]) \
{ \
return ossl_cipher_generic_get_params(params, EVP_CIPH_##UCMODE##_MODE, flags, \
kbits, blkbits, ivbits); \
} \
const OSSL_DISPATCH ossl_##alg##kbits##lcmode##_cts_functions[] = { \
{ OSSL_FUNC_CIPHER_NEWCTX, \
(void (*)(void)) alg##_##kbits##_##lcmode##_newctx }, \
{ OSSL_FUNC_CIPHER_FREECTX, (void (*)(void)) alg##_freectx }, \
{ OSSL_FUNC_CIPHER_DUPCTX, (void (*)(void)) alg##_dupctx }, \
{ OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))aes_cbc_cts_einit }, \
{ OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))aes_cbc_cts_dinit }, \
{ OSSL_FUNC_CIPHER_UPDATE, \
(void (*)(void)) ossl_##alg##_##lcmode##_cts_block_update }, \
{ OSSL_FUNC_CIPHER_FINAL, \
(void (*)(void)) ossl_##alg##_##lcmode##_cts_block_final }, \
{ OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))ossl_cipher_generic_cipher }, \
{ OSSL_FUNC_CIPHER_GET_PARAMS, \
(void (*)(void)) alg##_cts_##kbits##_##lcmode##_get_params }, \
{ OSSL_FUNC_CIPHER_GETTABLE_PARAMS, \
(void (*)(void))ossl_cipher_generic_gettable_params }, \
{ OSSL_FUNC_CIPHER_GET_CTX_PARAMS, \
(void (*)(void))aes_cbc_cts_get_ctx_params }, \
{ OSSL_FUNC_CIPHER_SET_CTX_PARAMS, \
(void (*)(void))aes_cbc_cts_set_ctx_params }, \
{ OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS, \
(void (*)(void))aes_cbc_cts_gettable_ctx_params }, \
{ OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS, \
(void (*)(void))aes_cbc_cts_settable_ctx_params }, \
{ 0, NULL } \
};
/* ossl_aes256cbc_cts_functions */ /* ossl_aes256cbc_cts_functions */
IMPLEMENT_cts_cipher(aes, AES, cbc, CBC, AES_CTS_FLAGS, 256, 128, 128, block) IMPLEMENT_cts_cipher(aes, AES, cbc, CBC, CTS_FLAGS, 256, 128, 128, block)
/* ossl_aes192cbc_cts_functions */ /* ossl_aes192cbc_cts_functions */
IMPLEMENT_cts_cipher(aes, AES, cbc, CBC, AES_CTS_FLAGS, 192, 128, 128, block) IMPLEMENT_cts_cipher(aes, AES, cbc, CBC, CTS_FLAGS, 192, 128, 128, block)
/* ossl_aes128cbc_cts_functions */ /* ossl_aes128cbc_cts_functions */
IMPLEMENT_cts_cipher(aes, AES, cbc, CBC, AES_CTS_FLAGS, 128, 128, 128, block) IMPLEMENT_cts_cipher(aes, AES, cbc, CBC, CTS_FLAGS, 128, 128, 128, block)

99
providers/implementations/ciphers/cipher_aes_cts.c → providers/implementations/ciphers/cipher_cts.c
View File

@ -1,5 +1,5 @@
/* /*
* Copyright 2020 The OpenSSL Project Authors. All Rights Reserved. * Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
* *
* Licensed under the Apache License 2.0 (the "License"). You may not use * Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy * this file except in compliance with the License. You can obtain a copy
@ -8,10 +8,10 @@
*/ */
/* /*
* Helper functions for AES CBC CTS ciphers. * Helper functions for 128 bit CBC CTS ciphers (Currently AES and Camellia).
* *
* The function dispatch tables are embedded into cipher_aes.c * The function dispatch tables are embedded into cipher_aes.c
* using cipher_aes_cts.inc * and cipher_camellia.c using cipher_aes_cts.inc and cipher_camellia_cts.inc
*/ */
/* /*
@ -48,19 +48,20 @@
#include "e_os.h" /* strcasecmp */ #include "e_os.h" /* strcasecmp */
#include <openssl/core_names.h> #include <openssl/core_names.h>
#include <openssl/aes.h>
#include "prov/ciphercommon.h" #include "prov/ciphercommon.h"
#include "internal/nelem.h" #include "internal/nelem.h"
#include "cipher_aes_cts.h" #include "cipher_cts.h"
/* The value assigned to 0 is the default */ /* The value assigned to 0 is the default */
#define CTS_CS1 0 #define CTS_CS1 0
#define CTS_CS2 1 #define CTS_CS2 1
#define CTS_CS3 2 #define CTS_CS3 2
#define CTS_BLOCK_SIZE 16
typedef union { typedef union {
size_t align; size_t align;
unsigned char c[AES_BLOCK_SIZE]; unsigned char c[CTS_BLOCK_SIZE];
} aligned_16bytes; } aligned_16bytes;
typedef struct cts_mode_name2id_st { typedef struct cts_mode_name2id_st {
@ -75,7 +76,7 @@ static CTS_MODE_NAME2ID cts_modes[] =
{ CTS_CS3, OSSL_CIPHER_CTS_MODE_CS3 }, { CTS_CS3, OSSL_CIPHER_CTS_MODE_CS3 },
}; };
const char *ossl_aes_cbc_cts_mode_id2name(unsigned int id) const char *ossl_cipher_cbc_cts_mode_id2name(unsigned int id)
{ {
size_t i; size_t i;
@ -86,7 +87,7 @@ const char *ossl_aes_cbc_cts_mode_id2name(unsigned int id)
return NULL; return NULL;
} }
int ossl_aes_cbc_cts_mode_name2id(const char *name) int ossl_cipher_cbc_cts_mode_name2id(const char *name)
{ {
size_t i; size_t i;
@ -103,7 +104,7 @@ static size_t cts128_cs1_encrypt(PROV_CIPHER_CTX *ctx, const unsigned char *in,
aligned_16bytes tmp_in; aligned_16bytes tmp_in;
size_t residue; size_t residue;
residue = len % AES_BLOCK_SIZE; residue = len % CTS_BLOCK_SIZE;
len -= residue; len -= residue;
if (!ctx->hw->cipher(ctx, out, in, len)) if (!ctx->hw->cipher(ctx, out, in, len))
return 0; return 0;
@ -116,8 +117,8 @@ static size_t cts128_cs1_encrypt(PROV_CIPHER_CTX *ctx, const unsigned char *in,
memset(tmp_in.c, 0, sizeof(tmp_in)); memset(tmp_in.c, 0, sizeof(tmp_in));
memcpy(tmp_in.c, in, residue); memcpy(tmp_in.c, in, residue);
if (!ctx->hw->cipher(ctx, out - AES_BLOCK_SIZE + residue, tmp_in.c, if (!ctx->hw->cipher(ctx, out - CTS_BLOCK_SIZE + residue, tmp_in.c,
AES_BLOCK_SIZE)) CTS_BLOCK_SIZE))
return 0; return 0;
return len + residue; return len + residue;
} }
@ -137,7 +138,7 @@ static size_t cts128_cs1_decrypt(PROV_CIPHER_CTX *ctx, const unsigned char *in,
aligned_16bytes mid_iv, ct_mid, pt_last; aligned_16bytes mid_iv, ct_mid, pt_last;
size_t residue; size_t residue;
residue = len % AES_BLOCK_SIZE; residue = len % CTS_BLOCK_SIZE;
if (residue == 0) { if (residue == 0) {
/* If there are no partial blocks then it is the same as CBC mode */ /* If there are no partial blocks then it is the same as CBC mode */
if (!ctx->hw->cipher(ctx, out, in, len)) if (!ctx->hw->cipher(ctx, out, in, len))
@ -145,7 +146,7 @@ static size_t cts128_cs1_decrypt(PROV_CIPHER_CTX *ctx, const unsigned char *in,
return len; return len;
} }
/* Process blocks at the start - but leave the last 2 blocks */ /* Process blocks at the start - but leave the last 2 blocks */
len -= AES_BLOCK_SIZE + residue; len -= CTS_BLOCK_SIZE + residue;
if (len > 0) { if (len > 0) {
if (!ctx->hw->cipher(ctx, out, in, len)) if (!ctx->hw->cipher(ctx, out, in, len))
return 0; return 0;
@ -153,11 +154,11 @@ static size_t cts128_cs1_decrypt(PROV_CIPHER_CTX *ctx, const unsigned char *in,
out += len; out += len;
} }
/* Save the iv that will be used by the second last block */ /* Save the iv that will be used by the second last block */
memcpy(mid_iv.c, ctx->iv, AES_BLOCK_SIZE); memcpy(mid_iv.c, ctx->iv, CTS_BLOCK_SIZE);
/* Decrypt the last block first using an iv of zero */ /* Decrypt the last block first using an iv of zero */
memset(ctx->iv, 0, AES_BLOCK_SIZE); memset(ctx->iv, 0, CTS_BLOCK_SIZE);
if (!ctx->hw->cipher(ctx, pt_last.c, in + residue, AES_BLOCK_SIZE)) if (!ctx->hw->cipher(ctx, pt_last.c, in + residue, CTS_BLOCK_SIZE))
return 0; return 0;
/* /*
@ -166,26 +167,26 @@ static size_t cts128_cs1_decrypt(PROV_CIPHER_CTX *ctx, const unsigned char *in,
* of the partial second last block. * of the partial second last block.
*/ */
memcpy(ct_mid.c, in, residue); memcpy(ct_mid.c, in, residue);
memcpy(ct_mid.c + residue, pt_last.c + residue, AES_BLOCK_SIZE - residue); memcpy(ct_mid.c + residue, pt_last.c + residue, CTS_BLOCK_SIZE - residue);
/* /*
* Restore the last partial ciphertext block. * Restore the last partial ciphertext block.
* Now that we have the cipher text of the second last block, apply * Now that we have the cipher text of the second last block, apply
* that to the partial plaintext end block. We have already decrypted the * that to the partial plaintext end block. We have already decrypted the
* block using an IV of zero. For decryption the IV is just XORed after * block using an IV of zero. For decryption the IV is just XORed after
* doing an AES block - so just XOR in the cipher text. * doing an Cipher CBC block - so just XOR in the cipher text.
*/ */
do_xor(ct_mid.c, pt_last.c, residue, out + AES_BLOCK_SIZE); do_xor(ct_mid.c, pt_last.c, residue, out + CTS_BLOCK_SIZE);
/* Restore the iv needed by the second last block */ /* Restore the iv needed by the second last block */
memcpy(ctx->iv, mid_iv.c, AES_BLOCK_SIZE); memcpy(ctx->iv, mid_iv.c, CTS_BLOCK_SIZE);
/* /*
* Decrypt the second last plaintext block now that we have rebuilt the * Decrypt the second last plaintext block now that we have rebuilt the
* ciphertext. * ciphertext.
*/ */
if (!ctx->hw->cipher(ctx, out, ct_mid.c, AES_BLOCK_SIZE)) if (!ctx->hw->cipher(ctx, out, ct_mid.c, CTS_BLOCK_SIZE))
return 0; return 0;
return len + AES_BLOCK_SIZE + residue; return len + CTS_BLOCK_SIZE + residue;
} }
static size_t cts128_cs3_encrypt(PROV_CIPHER_CTX *ctx, const unsigned char *in, static size_t cts128_cs3_encrypt(PROV_CIPHER_CTX *ctx, const unsigned char *in,
@ -194,12 +195,12 @@ static size_t cts128_cs3_encrypt(PROV_CIPHER_CTX *ctx, const unsigned char *in,
aligned_16bytes tmp_in; aligned_16bytes tmp_in;
size_t residue; size_t residue;
if (len <= AES_BLOCK_SIZE) /* CS3 requires 2 blocks */ if (len <= CTS_BLOCK_SIZE) /* CS3 requires 2 blocks */
return 0; return 0;
residue = len % AES_BLOCK_SIZE; residue = len % CTS_BLOCK_SIZE;
if (residue == 0) if (residue == 0)
residue = AES_BLOCK_SIZE; residue = CTS_BLOCK_SIZE;
len -= residue; len -= residue;
if (!ctx->hw->cipher(ctx, out, in, len)) if (!ctx->hw->cipher(ctx, out, in, len))
@ -210,8 +211,8 @@ static size_t cts128_cs3_encrypt(PROV_CIPHER_CTX *ctx, const unsigned char *in,
memset(tmp_in.c, 0, sizeof(tmp_in)); memset(tmp_in.c, 0, sizeof(tmp_in));
memcpy(tmp_in.c, in, residue); memcpy(tmp_in.c, in, residue);
memcpy(out, out - AES_BLOCK_SIZE, residue); memcpy(out, out - CTS_BLOCK_SIZE, residue);
if (!ctx->hw->cipher(ctx, out - AES_BLOCK_SIZE, tmp_in.c, AES_BLOCK_SIZE)) if (!ctx->hw->cipher(ctx, out - CTS_BLOCK_SIZE, tmp_in.c, CTS_BLOCK_SIZE))
return 0; return 0;
return len + residue; return len + residue;
} }
@ -230,14 +231,14 @@ static size_t cts128_cs3_decrypt(PROV_CIPHER_CTX *ctx, const unsigned char *in,
aligned_16bytes mid_iv, ct_mid, pt_last; aligned_16bytes mid_iv, ct_mid, pt_last;
size_t residue; size_t residue;
if (len <= AES_BLOCK_SIZE) /* CS3 requires 2 blocks */ if (len <= CTS_BLOCK_SIZE) /* CS3 requires 2 blocks */
return 0; return 0;
/* Process blocks at the start - but leave the last 2 blocks */ /* Process blocks at the start - but leave the last 2 blocks */
residue = len % AES_BLOCK_SIZE; residue = len % CTS_BLOCK_SIZE;
if (residue == 0) if (residue == 0)
residue = AES_BLOCK_SIZE; residue = CTS_BLOCK_SIZE;
len -= AES_BLOCK_SIZE + residue; len -= CTS_BLOCK_SIZE + residue;
if (len > 0) { if (len > 0) {
if (!ctx->hw->cipher(ctx, out, in, len)) if (!ctx->hw->cipher(ctx, out, in, len))
@ -246,11 +247,11 @@ static size_t cts128_cs3_decrypt(PROV_CIPHER_CTX *ctx, const unsigned char *in,
out += len; out += len;
} }
/* Save the iv that will be used by the second last block */ /* Save the iv that will be used by the second last block */
memcpy(mid_iv.c, ctx->iv, AES_BLOCK_SIZE); memcpy(mid_iv.c, ctx->iv, CTS_BLOCK_SIZE);
/* Decrypt the Cn block first using an iv of zero */ /* Decrypt the Cn block first using an iv of zero */
memset(ctx->iv, 0, AES_BLOCK_SIZE); memset(ctx->iv, 0, CTS_BLOCK_SIZE);
if (!ctx->hw->cipher(ctx, pt_last.c, in, AES_BLOCK_SIZE)) if (!ctx->hw->cipher(ctx, pt_last.c, in, CTS_BLOCK_SIZE))
return 0; return 0;
/* /*
@ -258,9 +259,9 @@ static size_t cts128_cs3_decrypt(PROV_CIPHER_CTX *ctx, const unsigned char *in,
* the decrypted C(n) block + replace the start with the ciphertext bytes * the decrypted C(n) block + replace the start with the ciphertext bytes
* of the partial last block. * of the partial last block.
*/ */
memcpy(ct_mid.c, in + AES_BLOCK_SIZE, residue); memcpy(ct_mid.c, in + CTS_BLOCK_SIZE, residue);
if (residue != AES_BLOCK_SIZE) if (residue != CTS_BLOCK_SIZE)
memcpy(ct_mid.c + residue, pt_last.c + residue, AES_BLOCK_SIZE - residue); memcpy(ct_mid.c + residue, pt_last.c + residue, CTS_BLOCK_SIZE - residue);
/* /*
* Restore the last partial ciphertext block. * Restore the last partial ciphertext block.
* Now that we have the cipher text of the second last block, apply * Now that we have the cipher text of the second last block, apply
@ -268,24 +269,24 @@ static size_t cts128_cs3_decrypt(PROV_CIPHER_CTX *ctx, const unsigned char *in,
* block using an IV of zero. For decryption the IV is just XORed after * block using an IV of zero. For decryption the IV is just XORed after
* doing an AES block - so just XOR in the ciphertext. * doing an AES block - so just XOR in the ciphertext.
*/ */
do_xor(ct_mid.c, pt_last.c, residue, out + AES_BLOCK_SIZE); do_xor(ct_mid.c, pt_last.c, residue, out + CTS_BLOCK_SIZE);
/* Restore the iv needed by the second last block */ /* Restore the iv needed by the second last block */
memcpy(ctx->iv, mid_iv.c, AES_BLOCK_SIZE); memcpy(ctx->iv, mid_iv.c, CTS_BLOCK_SIZE);
/* /*
* Decrypt the second last plaintext block now that we have rebuilt the * Decrypt the second last plaintext block now that we have rebuilt the
* ciphertext. * ciphertext.
*/ */
if (!ctx->hw->cipher(ctx, out, ct_mid.c, AES_BLOCK_SIZE)) if (!ctx->hw->cipher(ctx, out, ct_mid.c, CTS_BLOCK_SIZE))
return 0; return 0;
return len + AES_BLOCK_SIZE + residue; return len + CTS_BLOCK_SIZE + residue;
} }
static size_t cts128_cs2_encrypt(PROV_CIPHER_CTX *ctx, const unsigned char *in, static size_t cts128_cs2_encrypt(PROV_CIPHER_CTX *ctx, const unsigned char *in,
unsigned char *out, size_t len) unsigned char *out, size_t len)
{ {
if (len % AES_BLOCK_SIZE == 0) { if (len % CTS_BLOCK_SIZE == 0) {
/* If there are no partial blocks then it is the same as CBC mode */ /* If there are no partial blocks then it is the same as CBC mode */
if (!ctx->hw->cipher(ctx, out, in, len)) if (!ctx->hw->cipher(ctx, out, in, len))
return 0; return 0;
@ -298,7 +299,7 @@ static size_t cts128_cs2_encrypt(PROV_CIPHER_CTX *ctx, const unsigned char *in,
static size_t cts128_cs2_decrypt(PROV_CIPHER_CTX *ctx, const unsigned char *in, static size_t cts128_cs2_decrypt(PROV_CIPHER_CTX *ctx, const unsigned char *in,
unsigned char *out, size_t len) unsigned char *out, size_t len)
{ {
if (len % AES_BLOCK_SIZE == 0) { if (len % CTS_BLOCK_SIZE == 0) {
/* If there are no partial blocks then it is the same as CBC mode */ /* If there are no partial blocks then it is the same as CBC mode */
if (!ctx->hw->cipher(ctx, out, in, len)) if (!ctx->hw->cipher(ctx, out, in, len))
return 0; return 0;
@ -308,14 +309,14 @@ static size_t cts128_cs2_decrypt(PROV_CIPHER_CTX *ctx, const unsigned char *in,
return cts128_cs3_decrypt(ctx, in, out, len); return cts128_cs3_decrypt(ctx, in, out, len);
} }
int ossl_aes_cbc_cts_block_update(void *vctx, unsigned char *out, size_t *outl, int ossl_cipher_cbc_cts_block_update(void *vctx, unsigned char *out, size_t *outl,
size_t outsize, const unsigned char *in, size_t outsize, const unsigned char *in,
size_t inl) size_t inl)
{ {
PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx; PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
size_t sz = 0; size_t sz = 0;
if (inl < AES_BLOCK_SIZE) /* There must be at least one block for CTS mode */ if (inl < CTS_BLOCK_SIZE) /* There must be at least one block for CTS mode */
return 0; return 0;
if (outsize < inl) if (outsize < inl)
return 0; return 0;
@ -353,8 +354,8 @@ int ossl_aes_cbc_cts_block_update(void *vctx, unsigned char *out, size_t *outl,
return 1; return 1;
} }
int ossl_aes_cbc_cts_block_final(void *vctx, unsigned char *out, size_t *outl, int ossl_cipher_cbc_cts_block_final(void *vctx, unsigned char *out, size_t *outl,
size_t outsize) size_t outsize)
{ {
*outl = 0; *outl = 0;
return 1; return 1;

52
providers/implementations/ciphers/cipher_cts.h Normal file
View File

@ -0,0 +1,52 @@
/*
* Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include "crypto/evp.h"
/* NOTE: The underlying block cipher is CBC so we reuse most of the code */
#define IMPLEMENT_cts_cipher(alg, UCALG, lcmode, UCMODE, flags, kbits, \
blkbits, ivbits, typ) \
static OSSL_FUNC_cipher_get_params_fn alg##_##kbits##_##lcmode##_get_params; \
static int alg##_cts_##kbits##_##lcmode##_get_params(OSSL_PARAM params[]) \
{ \
return ossl_cipher_generic_get_params(params, EVP_CIPH_##UCMODE##_MODE, \
flags, kbits, blkbits, ivbits); \
} \
const OSSL_DISPATCH ossl_##alg##kbits##lcmode##_cts_functions[] = { \
{ OSSL_FUNC_CIPHER_NEWCTX, \
(void (*)(void)) alg##_##kbits##_##lcmode##_newctx }, \
{ OSSL_FUNC_CIPHER_FREECTX, (void (*)(void)) alg##_freectx }, \
{ OSSL_FUNC_CIPHER_DUPCTX, (void (*)(void)) alg##_dupctx }, \
{ OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void)) alg##_cbc_cts_einit }, \
{ OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void)) alg##_cbc_cts_dinit }, \
{ OSSL_FUNC_CIPHER_UPDATE, \
(void (*)(void)) ossl_cipher_cbc_cts_block_update }, \
{ OSSL_FUNC_CIPHER_FINAL, \
(void (*)(void)) ossl_cipher_cbc_cts_block_final }, \
{ OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))ossl_cipher_generic_cipher }, \
{ OSSL_FUNC_CIPHER_GET_PARAMS, \
(void (*)(void)) alg##_cts_##kbits##_##lcmode##_get_params }, \
{ OSSL_FUNC_CIPHER_GETTABLE_PARAMS, \
(void (*)(void))ossl_cipher_generic_gettable_params }, \
{ OSSL_FUNC_CIPHER_GET_CTX_PARAMS, \
(void (*)(void)) alg##_cbc_cts_get_ctx_params }, \
{ OSSL_FUNC_CIPHER_SET_CTX_PARAMS, \
(void (*)(void)) alg##_cbc_cts_set_ctx_params }, \
{ OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS, \
(void (*)(void)) alg##_cbc_cts_gettable_ctx_params }, \
{ OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS, \
(void (*)(void)) alg##_cbc_cts_settable_ctx_params }, \
{ 0, NULL } \
};
OSSL_FUNC_cipher_update_fn ossl_cipher_cbc_cts_block_update;
OSSL_FUNC_cipher_final_fn ossl_cipher_cbc_cts_block_final;
const char *ossl_cipher_cbc_cts_mode_id2name(unsigned int id);
int ossl_cipher_cbc_cts_mode_name2id(const char *name);