3 * Copyright 2019-2022 The OpenSSL Project Authors. All Rights Reserved.
5 * Licensed under the Apache License 2.0 (the "License"). You may not use
6 * this file except in compliance with the License. You can obtain a copy
7 * in the file LICENSE in the source distribution or at
8 * https://www.openssl.org/source/license.html
11 #ifndef OSSL_PROV_CIPHERCOMMON_GCM_H
12 # define OSSL_PROV_CIPHERCOMMON_GCM_H
15 # include <openssl/aes.h>
16 # include "ciphercommon_aead.h"
18 typedef struct prov_gcm_hw_st PROV_GCM_HW;
20 # define GCM_IV_DEFAULT_SIZE 12 /* IV's for AES_GCM should normally be 12 bytes */
21 # define GCM_IV_MAX_SIZE (1024 / 8)
22 # define GCM_TAG_MAX_SIZE 16
24 # if defined(OPENSSL_CPUID_OBJ) && defined(__s390__)
26 * KMA-GCM-AES parameter block - begin
27 * (see z/Architecture Principles of Operation >= SA22-7832-11)
29 typedef struct S390X_kma_params_st {
30 unsigned char reserved[12];
34 } cv; /* 32 bit counter value */
36 unsigned long long g[2];
39 unsigned char h[16]; /* hash subkey */
40 unsigned long long taadl; /* total AAD length */
41 unsigned long long tpcl; /* total plaintxt/ciphertxt len */
43 unsigned long long g[2];
45 } j0; /* initial counter value */
46 unsigned char k[32]; /* key */
51 typedef struct prov_gcm_ctx_st {
52 unsigned int mode; /* The mode that we are using */
56 size_t tls_aad_pad_sz;
57 size_t tls_aad_len; /* TLS AAD length */
58 uint64_t tls_enc_records; /* Number of TLS records encrypted */
61 * num contains the number of bytes of |iv| which are valid for modes that
62 * manage partial blocks themselves.
65 size_t bufsz; /* Number of bytes in buf */
68 unsigned int iv_state; /* set to one of IV_STATE_XXX */
69 unsigned int enc:1; /* Set to 1 if we are encrypting or 0 otherwise */
70 unsigned int pad:1; /* Whether padding should be used or not */
71 unsigned int key_set:1; /* Set if key initialised */
72 unsigned int iv_gen_rand:1; /* No IV was specified, so generate a rand IV */
73 unsigned int iv_gen:1; /* It is OK to generate IVs */
75 unsigned char iv[GCM_IV_MAX_SIZE]; /* Buffer to use for IV's */
76 unsigned char buf[AES_BLOCK_SIZE]; /* Buffer of partial blocks processed via update calls */
78 OSSL_LIB_CTX *libctx; /* needed for rand calls */
79 const PROV_GCM_HW *hw; /* hardware specific methods */
84 PROV_CIPHER_FUNC(int, GCM_setkey, (PROV_GCM_CTX *ctx, const unsigned char *key,
86 PROV_CIPHER_FUNC(int, GCM_setiv, (PROV_GCM_CTX *dat, const unsigned char *iv,
88 PROV_CIPHER_FUNC(int, GCM_aadupdate, (PROV_GCM_CTX *ctx,
89 const unsigned char *aad, size_t aadlen));
90 PROV_CIPHER_FUNC(int, GCM_cipherupdate, (PROV_GCM_CTX *ctx,
91 const unsigned char *in, size_t len,
93 PROV_CIPHER_FUNC(int, GCM_cipherfinal, (PROV_GCM_CTX *ctx, unsigned char *tag));
94 PROV_CIPHER_FUNC(int, GCM_oneshot, (PROV_GCM_CTX *ctx, unsigned char *aad,
95 size_t aad_len, const unsigned char *in,
96 size_t in_len, unsigned char *out,
97 unsigned char *tag, size_t taglen));
98 struct prov_gcm_hw_st {
99 OSSL_GCM_setkey_fn setkey;
100 OSSL_GCM_setiv_fn setiv;
101 OSSL_GCM_aadupdate_fn aadupdate;
102 OSSL_GCM_cipherupdate_fn cipherupdate;
103 OSSL_GCM_cipherfinal_fn cipherfinal;
104 OSSL_GCM_oneshot_fn oneshot;
107 OSSL_FUNC_cipher_encrypt_init_fn ossl_gcm_einit;
108 OSSL_FUNC_cipher_decrypt_init_fn ossl_gcm_dinit;
109 OSSL_FUNC_cipher_get_ctx_params_fn ossl_gcm_get_ctx_params;
110 OSSL_FUNC_cipher_set_ctx_params_fn ossl_gcm_set_ctx_params;
111 OSSL_FUNC_cipher_cipher_fn ossl_gcm_cipher;
112 OSSL_FUNC_cipher_update_fn ossl_gcm_stream_update;
113 OSSL_FUNC_cipher_final_fn ossl_gcm_stream_final;
114 void ossl_gcm_initctx(void *provctx, PROV_GCM_CTX *ctx, size_t keybits,
115 const PROV_GCM_HW *hw);
117 int ossl_gcm_setiv(PROV_GCM_CTX *ctx, const unsigned char *iv, size_t ivlen);
118 int ossl_gcm_aad_update(PROV_GCM_CTX *ctx, const unsigned char *aad,
120 int ossl_gcm_cipher_final(PROV_GCM_CTX *ctx, unsigned char *tag);
121 int ossl_gcm_one_shot(PROV_GCM_CTX *ctx, unsigned char *aad, size_t aad_len,
122 const unsigned char *in, size_t in_len,
123 unsigned char *out, unsigned char *tag, size_t tag_len);
124 int ossl_gcm_cipher_update(PROV_GCM_CTX *ctx, const unsigned char *in,
125 size_t len, unsigned char *out);
127 # define GCM_HW_SET_KEY_CTR_FN(ks, fn_set_enc_key, fn_block, fn_ctr) \
128 fn_set_enc_key(key, keylen * 8, ks); \
129 CRYPTO_gcm128_init(&ctx->gcm, ks, (block128_f)fn_block); \
130 ctx->ctr = (ctr128_f)fn_ctr; \