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/*
* Copyright 2019-2021 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 <openssl/aes.h>
#include "ciphercommon_aead.h"
typedef struct prov_gcm_hw_st PROV_GCM_HW;
#define GCM_IV_DEFAULT_SIZE 12 /* IV's for AES_GCM should normally be 12 bytes */
#define GCM_IV_MAX_SIZE (1024 / 8)
#define GCM_TAG_MAX_SIZE 16
#if defined(OPENSSL_CPUID_OBJ) && defined(__s390__)
/*-
* KMA-GCM-AES parameter block - begin
* (see z/Architecture Principles of Operation >= SA22-7832-11)
*/
typedef struct S390X_kma_params_st {
unsigned char reserved[12];
union {
unsigned int w;
unsigned char b[4];
} cv; /* 32 bit counter value */
union {
unsigned long long g[2];
unsigned char b[16];
} t; /* tag */
unsigned char h[16]; /* hash subkey */
unsigned long long taadl; /* total AAD length */
unsigned long long tpcl; /* total plaintxt/ciphertxt len */
union {
unsigned long long g[2];
unsigned int w[4];
} j0; /* initial counter value */
unsigned char k[32]; /* key */
} S390X_KMA_PARAMS;
#endif
typedef struct prov_gcm_ctx_st {
unsigned int mode; /* The mode that we are using */
size_t keylen;
size_t ivlen;
size_t taglen;
size_t tls_aad_pad_sz;
size_t tls_aad_len; /* TLS AAD length */
uint64_t tls_enc_records; /* Number of TLS records encrypted */
/*
* num contains the number of bytes of |iv| which are valid for modes that
* manage partial blocks themselves.
*/
size_t num;
size_t bufsz; /* Number of bytes in buf */
uint64_t flags;
unsigned int iv_state; /* set to one of IV_STATE_XXX */
unsigned int enc:1; /* Set to 1 if we are encrypting or 0 otherwise */
unsigned int pad:1; /* Whether padding should be used or not */
unsigned int key_set:1; /* Set if key initialised */
unsigned int iv_gen_rand:1; /* No IV was specified, so generate a rand IV */
unsigned int iv_gen:1; /* It is OK to generate IVs */
unsigned char iv[GCM_IV_MAX_SIZE]; /* Buffer to use for IV's */
unsigned char buf[AES_BLOCK_SIZE]; /* Buffer of partial blocks processed via update calls */
OSSL_LIB_CTX *libctx; /* needed for rand calls */
const PROV_GCM_HW *hw; /* hardware specific methods */
GCM128_CONTEXT gcm;
ctr128_f ctr;
const void *ks;
} PROV_GCM_CTX;
PROV_CIPHER_FUNC(int, GCM_setkey, (PROV_GCM_CTX *ctx, const unsigned char *key,
size_t keylen));
PROV_CIPHER_FUNC(int, GCM_setiv, (PROV_GCM_CTX *dat, const unsigned char *iv,
size_t ivlen));
PROV_CIPHER_FUNC(int, GCM_aadupdate, (PROV_GCM_CTX *ctx,
const unsigned char *aad, size_t aadlen));
PROV_CIPHER_FUNC(int, GCM_cipherupdate, (PROV_GCM_CTX *ctx,
const unsigned char *in, size_t len,
unsigned char *out));
PROV_CIPHER_FUNC(int, GCM_cipherfinal, (PROV_GCM_CTX *ctx, unsigned char *tag));
PROV_CIPHER_FUNC(int, GCM_oneshot, (PROV_GCM_CTX *ctx, unsigned char *aad,
size_t aad_len, const unsigned char *in,
size_t in_len, unsigned char *out,
unsigned char *tag, size_t taglen));
struct prov_gcm_hw_st {
OSSL_GCM_setkey_fn setkey;
OSSL_GCM_setiv_fn setiv;
OSSL_GCM_aadupdate_fn aadupdate;
OSSL_GCM_cipherupdate_fn cipherupdate;
OSSL_GCM_cipherfinal_fn cipherfinal;
OSSL_GCM_oneshot_fn oneshot;
};
OSSL_FUNC_cipher_encrypt_init_fn ossl_gcm_einit;
OSSL_FUNC_cipher_decrypt_init_fn ossl_gcm_dinit;
OSSL_FUNC_cipher_get_ctx_params_fn ossl_gcm_get_ctx_params;
OSSL_FUNC_cipher_set_ctx_params_fn ossl_gcm_set_ctx_params;
OSSL_FUNC_cipher_cipher_fn ossl_gcm_cipher;
OSSL_FUNC_cipher_update_fn ossl_gcm_stream_update;
OSSL_FUNC_cipher_final_fn ossl_gcm_stream_final;
void ossl_gcm_initctx(void *provctx, PROV_GCM_CTX *ctx, size_t keybits,
const PROV_GCM_HW *hw);
int ossl_gcm_setiv(PROV_GCM_CTX *ctx, const unsigned char *iv, size_t ivlen);
int ossl_gcm_aad_update(PROV_GCM_CTX *ctx, const unsigned char *aad,
size_t aad_len);
int ossl_gcm_cipher_final(PROV_GCM_CTX *ctx, unsigned char *tag);
int ossl_gcm_one_shot(PROV_GCM_CTX *ctx, unsigned char *aad, size_t aad_len,
const unsigned char *in, size_t in_len,
unsigned char *out, unsigned char *tag, size_t tag_len);
int ossl_gcm_cipher_update(PROV_GCM_CTX *ctx, const unsigned char *in,
size_t len, unsigned char *out);
#define GCM_HW_SET_KEY_CTR_FN(ks, fn_set_enc_key, fn_block, fn_ctr) \
ctx->ks = ks; \
fn_set_enc_key(key, keylen * 8, ks); \
CRYPTO_gcm128_init(&ctx->gcm, ks, (block128_f)fn_block); \
ctx->ctr = (ctr128_f)fn_ctr; \
ctx->key_set = 1;
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