/* ====================================================================
* Copyright (c) 2008 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
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* 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
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* ==================================================================== */
#ifndef OPENSSL_HEADER_MODES_INTERNAL_H
#define OPENSSL_HEADER_MODES_INTERNAL_H
#include <openssl/base.h>
#include <openssl/aes.h>
#include <openssl/cpu.h>
#include <stdlib.h>
#include <string.h>
#include "../../internal.h"
#if defined(__cplusplus)
extern "C" {
#endif
static inline uint32_t GETU32(const void *in) {
uint32_t v;
OPENSSL_memcpy(&v, in, sizeof(v));
return CRYPTO_bswap4(v);
}
static inline void PUTU32(void *out, uint32_t v) {
v = CRYPTO_bswap4(v);
OPENSSL_memcpy(out, &v, sizeof(v));
}
static inline size_t load_word_le(const void *in) {
size_t v;
OPENSSL_memcpy(&v, in, sizeof(v));
return v;
}
static inline void store_word_le(void *out, size_t v) {
OPENSSL_memcpy(out, &v, sizeof(v));
}
// block128_f is the type of an AES block cipher implementation.
//
// Unlike upstream OpenSSL, it and the other functions in this file hard-code
// |AES_KEY|. It is undefined in C to call a function pointer with anything
// other than the original type. Thus we either must match |block128_f| to the
// type signature of |AES_encrypt| and friends or pass in |void*| wrapper
// functions.
//
// These functions are called exclusively with AES, so we use the former.
typedef void (*block128_f)(const uint8_t in[16], uint8_t out[16],
const AES_KEY *key);
// CTR.
// ctr128_f is the type of a function that performs CTR-mode encryption.
typedef void (*ctr128_f)(const uint8_t *in, uint8_t *out, size_t blocks,
const AES_KEY *key, const uint8_t ivec[16]);
// CRYPTO_ctr128_encrypt encrypts (or decrypts, it's the same in CTR mode)
// |len| bytes from |in| to |out| using |block| in counter mode. There's no
// requirement that |len| be a multiple of any value and any partial blocks are
// stored in |ecount_buf| and |*num|, which must be zeroed before the initial
// call. The counter is a 128-bit, big-endian value in |ivec| and is
// incremented by this function.
void CRYPTO_ctr128_encrypt(const uint8_t *in, uint8_t *out, size_t len,
const AES_KEY *key, uint8_t ivec[16],
uint8_t ecount_buf[16], unsigned *num,
block128_f block);
// CRYPTO_ctr128_encrypt_ctr32 acts like |CRYPTO_ctr128_encrypt| but takes
// |ctr|, a function that performs CTR mode but only deals with the lower 32
// bits of the counter. This is useful when |ctr| can be an optimised
// function.
void CRYPTO_ctr128_encrypt_ctr32(const uint8_t *in, uint8_t *out, size_t len,
const AES_KEY *key, uint8_t ivec[16],
uint8_t ecount_buf[16], unsigned *num,
ctr128_f ctr);
// GCM.
//
// This API differs from the upstream API slightly. The |GCM128_CONTEXT| does
// not have a |key| pointer that points to the key as upstream's version does.
// Instead, every function takes a |key| parameter. This way |GCM128_CONTEXT|
// can be safely copied. Additionally, |gcm_key| is split into a separate
// struct.
typedef struct { uint64_t hi,lo; } u128;
// gmult_func multiplies |Xi| by the GCM key and writes the result back to
// |Xi|.
typedef void (*gmult_func)(uint64_t Xi[2], const u128 Htable[16]);
// ghash_func repeatedly multiplies |Xi| by the GCM key and adds in blocks from
// |inp|. The result is written back to |Xi| and the |len| argument must be a
// multiple of 16.
typedef void (*ghash_func)(uint64_t Xi[2], const u128 Htable[16],
const uint8_t *inp, size_t len);
typedef struct gcm128_key_st {
// Note the MOVBE-based, x86-64, GHASH assembly requires |H| and |Htable| to
// be the first two elements of this struct. Additionally, some assembly
// routines require a 16-byte-aligned |Htable| when hashing data, but not
// initialization. |GCM128_KEY| is not itself aligned to simplify embedding in
// |EVP_AEAD_CTX|, but |Htable|'s offset must be a multiple of 16.
u128 H;
u128 Htable[16];
gmult_func gmult;
ghash_func ghash;
block128_f block;
// use_aesni_gcm_crypt is true if this context should use the assembly
// functions |aesni_gcm_encrypt| and |aesni_gcm_decrypt| to process data.
unsigned use_aesni_gcm_crypt:1;
} GCM128_KEY;
// GCM128_CONTEXT contains state for a single GCM operation. The structure
// should be zero-initialized before use.
typedef struct {
// The following 5 names follow names in GCM specification
union {
uint64_t u[2];
uint32_t d[4];
uint8_t c[16];
size_t t[16 / sizeof(size_t)];
} Yi, EKi, EK0, len, Xi;
// Note that the order of |Xi| and |gcm_key| is fixed by the MOVBE-based,
// x86-64, GHASH assembly. Additionally, some assembly routines require
// |gcm_key| to be 16-byte aligned. |GCM128_KEY| is not itself aligned to
// simplify embedding in |EVP_AEAD_CTX|.
alignas(16) GCM128_KEY gcm_key;
unsigned mres, ares;
} GCM128_CONTEXT;
#if defined(OPENSSL_X86) || defined(OPENSSL_X86_64)
// crypto_gcm_clmul_enabled returns one if the CLMUL implementation of GCM is
// used.
int crypto_gcm_clmul_enabled(void);
#endif
// CRYPTO_ghash_init writes a precomputed table of powers of |gcm_key| to
// |out_table| and sets |*out_mult| and |*out_hash| to (potentially hardware
// accelerated) functions for performing operations in the GHASH field. If the
// AVX implementation was used |*out_is_avx| will be true.
void CRYPTO_ghash_init(gmult_func *out_mult, ghash_func *out_hash,
u128 *out_key, u128 out_table[16], int *out_is_avx,
const uint8_t gcm_key[16]);
// CRYPTO_gcm128_init_key initialises |gcm_key| to use |block| (typically AES)
// with the given key. |block_is_hwaes| is one if |block| is |aes_hw_encrypt|.
OPENSSL_EXPORT void CRYPTO_gcm128_init_key(GCM128_KEY *gcm_key,
const AES_KEY *key, block128_f block,
int block_is_hwaes);
// CRYPTO_gcm128_setiv sets the IV (nonce) for |ctx|. The |key| must be the
// same key that was passed to |CRYPTO_gcm128_init|.
OPENSSL_EXPORT void CRYPTO_gcm128_setiv(GCM128_CONTEXT *ctx, const AES_KEY *key,
const uint8_t *iv, size_t iv_len);
// CRYPTO_gcm128_aad sets the authenticated data for an instance of GCM.
// This must be called before and data is encrypted. It returns one on success
// and zero otherwise.
OPENSSL_EXPORT int CRYPTO_gcm128_aad(GCM128_CONTEXT *ctx, const uint8_t *aad,
size_t len);
// CRYPTO_gcm128_encrypt encrypts |len| bytes from |in| to |out|. The |key|
// must be the same key that was passed to |CRYPTO_gcm128_init|. It returns one
// on success and zero otherwise.
OPENSSL_EXPORT int CRYPTO_gcm128_encrypt(GCM128_CONTEXT *ctx,
const AES_KEY *key, const uint8_t *in,
uint8_t *out, size_t len);
// CRYPTO_gcm128_decrypt decrypts |len| bytes from |in| to |out|. The |key|
// must be the same key that was passed to |CRYPTO_gcm128_init|. It returns one
// on success and zero otherwise.
OPENSSL_EXPORT int CRYPTO_gcm128_decrypt(GCM128_CONTEXT *ctx,
const AES_KEY *key, const uint8_t *in,
uint8_t *out, size_t len);
// CRYPTO_gcm128_encrypt_ctr32 encrypts |len| bytes from |in| to |out| using
// a CTR function that only handles the bottom 32 bits of the nonce, like
// |CRYPTO_ctr128_encrypt_ctr32|. The |key| must be the same key that was
// passed to |CRYPTO_gcm128_init|. It returns one on success and zero
// otherwise.
OPENSSL_EXPORT int CRYPTO_gcm128_encrypt_ctr32(GCM128_CONTEXT *ctx,
const AES_KEY *key,
const uint8_t *in, uint8_t *out,
size_t len, ctr128_f stream);
// CRYPTO_gcm128_decrypt_ctr32 decrypts |len| bytes from |in| to |out| using
// a CTR function that only handles the bottom 32 bits of the nonce, like
// |CRYPTO_ctr128_encrypt_ctr32|. The |key| must be the same key that was
// passed to |CRYPTO_gcm128_init|. It returns one on success and zero
// otherwise.
OPENSSL_EXPORT int CRYPTO_gcm128_decrypt_ctr32(GCM128_CONTEXT *ctx,
const AES_KEY *key,
const uint8_t *in, uint8_t *out,
size_t len, ctr128_f stream);
// CRYPTO_gcm128_finish calculates the authenticator and compares it against
// |len| bytes of |tag|. It returns one on success and zero otherwise.
OPENSSL_EXPORT int CRYPTO_gcm128_finish(GCM128_CONTEXT *ctx, const uint8_t *tag,
size_t len);
// CRYPTO_gcm128_tag calculates the authenticator and copies it into |tag|.
// The minimum of |len| and 16 bytes are copied into |tag|.
OPENSSL_EXPORT void CRYPTO_gcm128_tag(GCM128_CONTEXT *ctx, uint8_t *tag,
size_t len);
// GCM assembly.
#if !defined(OPENSSL_NO_ASM) && \
(defined(OPENSSL_X86) || defined(OPENSSL_X86_64) || \
defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64) || \
defined(OPENSSL_PPC64LE))
#define GHASH_ASM
#endif
void gcm_init_4bit(u128 Htable[16], const uint64_t H[2]);
void gcm_gmult_4bit(uint64_t Xi[2], const u128 Htable[16]);
void gcm_ghash_4bit(uint64_t Xi[2], const u128 Htable[16], const uint8_t *inp,
size_t len);
#if defined(GHASH_ASM)
#if defined(OPENSSL_X86) || defined(OPENSSL_X86_64)
#define GCM_FUNCREF_4BIT
void gcm_init_clmul(u128 Htable[16], const uint64_t Xi[2]);
void gcm_gmult_clmul(uint64_t Xi[2], const u128 Htable[16]);
void gcm_ghash_clmul(uint64_t Xi[2], const u128 Htable[16], const uint8_t *inp,
size_t len);
OPENSSL_INLINE char gcm_ssse3_capable(void) {
return (OPENSSL_ia32cap_get()[1] & (1 << (41 - 32))) != 0;
}
// |gcm_gmult_ssse3| and |gcm_ghash_ssse3| require |Htable| to be
// 16-byte-aligned, but |gcm_init_ssse3| does not.
void gcm_init_ssse3(u128 Htable[16], const uint64_t Xi[2]);
void gcm_gmult_ssse3(uint64_t Xi[2], const u128 Htable[16]);
void gcm_ghash_ssse3(uint64_t Xi[2], const u128 Htable[16], const uint8_t *in,
size_t len);
#if defined(OPENSSL_X86_64)
#define GHASH_ASM_X86_64
void gcm_init_avx(u128 Htable[16], const uint64_t Xi[2]);
void gcm_gmult_avx(uint64_t Xi[2], const u128 Htable[16]);
void gcm_ghash_avx(uint64_t Xi[2], const u128 Htable[16], const uint8_t *in,
size_t len);
#define AESNI_GCM
size_t aesni_gcm_encrypt(const uint8_t *in, uint8_t *out, size_t len,
const AES_KEY *key, uint8_t ivec[16], uint64_t *Xi);
size_t aesni_gcm_decrypt(const uint8_t *in, uint8_t *out, size_t len,
const AES_KEY *key, uint8_t ivec[16], uint64_t *Xi);
#endif // OPENSSL_X86_64
#if defined(OPENSSL_X86)
#define GHASH_ASM_X86
void gcm_gmult_4bit_mmx(uint64_t Xi[2], const u128 Htable[16]);
void gcm_ghash_4bit_mmx(uint64_t Xi[2], const u128 Htable[16], const uint8_t *inp,
size_t len);
#endif // OPENSSL_X86
#elif defined(OPENSSL_ARM) || defined(OPENSSL_AARCH64)
#define GHASH_ASM_ARM
#define GCM_FUNCREF_4BIT
OPENSSL_INLINE int gcm_pmull_capable(void) {
return CRYPTO_is_ARMv8_PMULL_capable();
}
void gcm_init_v8(u128 Htable[16], const uint64_t Xi[2]);
void gcm_gmult_v8(uint64_t Xi[2], const u128 Htable[16]);
void gcm_ghash_v8(uint64_t Xi[2], const u128 Htable[16], const uint8_t *inp,
size_t len);
OPENSSL_INLINE int gcm_neon_capable(void) { return CRYPTO_is_NEON_capable(); }
void gcm_init_neon(u128 Htable[16], const uint64_t Xi[2]);
void gcm_gmult_neon(uint64_t Xi[2], const u128 Htable[16]);
void gcm_ghash_neon(uint64_t Xi[2], const u128 Htable[16], const uint8_t *inp,
size_t len);
#elif defined(OPENSSL_PPC64LE)
#define GHASH_ASM_PPC64LE
#define GCM_FUNCREF_4BIT
void gcm_init_p8(u128 Htable[16], const uint64_t Xi[2]);
void gcm_gmult_p8(uint64_t Xi[2], const u128 Htable[16]);
void gcm_ghash_p8(uint64_t Xi[2], const u128 Htable[16], const uint8_t *inp,
size_t len);
#endif
#endif // GHASH_ASM
// CCM.
typedef struct ccm128_context {
block128_f block;
ctr128_f ctr;
unsigned M, L;
} CCM128_CONTEXT;
// CRYPTO_ccm128_init initialises |ctx| to use |block| (typically AES) with the
// specified |M| and |L| parameters. It returns one on success and zero if |M|
// or |L| is invalid.
int CRYPTO_ccm128_init(CCM128_CONTEXT *ctx, const AES_KEY *key,
block128_f block, ctr128_f ctr, unsigned M, unsigned L);
// CRYPTO_ccm128_max_input returns the maximum input length accepted by |ctx|.
size_t CRYPTO_ccm128_max_input(const CCM128_CONTEXT *ctx);
// CRYPTO_ccm128_encrypt encrypts |len| bytes from |in| to |out| writing the tag
// to |out_tag|. |key| must be the same key that was passed to
// |CRYPTO_ccm128_init|. It returns one on success and zero otherwise.
int CRYPTO_ccm128_encrypt(const CCM128_CONTEXT *ctx, const AES_KEY *key,
uint8_t *out, uint8_t *out_tag, size_t tag_len,
const uint8_t *nonce, size_t nonce_len,
const uint8_t *in, size_t len, const uint8_t *aad,
size_t aad_len);
// CRYPTO_ccm128_decrypt decrypts |len| bytes from |in| to |out|, writing the
// expected tag to |out_tag|. |key| must be the same key that was passed to
// |CRYPTO_ccm128_init|. It returns one on success and zero otherwise.
int CRYPTO_ccm128_decrypt(const CCM128_CONTEXT *ctx, const AES_KEY *key,
uint8_t *out, uint8_t *out_tag, size_t tag_len,
const uint8_t *nonce, size_t nonce_len,
const uint8_t *in, size_t len, const uint8_t *aad,
size_t aad_len);
// CBC.
// cbc128_f is the type of a function that performs CBC-mode encryption.
typedef void (*cbc128_f)(const uint8_t *in, uint8_t *out, size_t len,
const AES_KEY *key, uint8_t ivec[16], int enc);
// CRYPTO_cbc128_encrypt encrypts |len| bytes from |in| to |out| using the
// given IV and block cipher in CBC mode. The input need not be a multiple of
// 128 bits long, but the output will round up to the nearest 128 bit multiple,
// zero padding the input if needed. The IV will be updated on return.
void CRYPTO_cbc128_encrypt(const uint8_t *in, uint8_t *out, size_t len,
const AES_KEY *key, uint8_t ivec[16],
block128_f block);
// CRYPTO_cbc128_decrypt decrypts |len| bytes from |in| to |out| using the
// given IV and block cipher in CBC mode. If |len| is not a multiple of 128
// bits then only that many bytes will be written, but a multiple of 128 bits
// is always read from |in|. The IV will be updated on return.
void CRYPTO_cbc128_decrypt(const uint8_t *in, uint8_t *out, size_t len,
const AES_KEY *key, uint8_t ivec[16],
block128_f block);
// OFB.
// CRYPTO_ofb128_encrypt encrypts (or decrypts, it's the same with OFB mode)
// |len| bytes from |in| to |out| using |block| in OFB mode. There's no
// requirement that |len| be a multiple of any value and any partial blocks are
// stored in |ivec| and |*num|, the latter must be zero before the initial
// call.
void CRYPTO_ofb128_encrypt(const uint8_t *in, uint8_t *out, size_t len,
const AES_KEY *key, uint8_t ivec[16], unsigned *num,
block128_f block);
// CFB.
// CRYPTO_cfb128_encrypt encrypts (or decrypts, if |enc| is zero) |len| bytes
// from |in| to |out| using |block| in CFB mode. There's no requirement that
// |len| be a multiple of any value and any partial blocks are stored in |ivec|
// and |*num|, the latter must be zero before the initial call.
void CRYPTO_cfb128_encrypt(const uint8_t *in, uint8_t *out, size_t len,
const AES_KEY *key, uint8_t ivec[16], unsigned *num,
int enc, block128_f block);
// CRYPTO_cfb128_8_encrypt encrypts (or decrypts, if |enc| is zero) |len| bytes
// from |in| to |out| using |block| in CFB-8 mode. Prior to the first call
// |num| should be set to zero.
void CRYPTO_cfb128_8_encrypt(const uint8_t *in, uint8_t *out, size_t len,
const AES_KEY *key, uint8_t ivec[16],
unsigned *num, int enc, block128_f block);
// CRYPTO_cfb128_1_encrypt encrypts (or decrypts, if |enc| is zero) |len| bytes
// from |in| to |out| using |block| in CFB-1 mode. Prior to the first call
// |num| should be set to zero.
void CRYPTO_cfb128_1_encrypt(const uint8_t *in, uint8_t *out, size_t bits,
const AES_KEY *key, uint8_t ivec[16],
unsigned *num, int enc, block128_f block);
size_t CRYPTO_cts128_encrypt_block(const uint8_t *in, uint8_t *out, size_t len,
const AES_KEY *key, uint8_t ivec[16],
block128_f block);
// POLYVAL.
//
// POLYVAL is a polynomial authenticator that operates over a field very
// similar to the one that GHASH uses. See
// https://tools.ietf.org/html/draft-irtf-cfrg-gcmsiv-02#section-3.
typedef union {
uint64_t u[2];
uint8_t c[16];
} polyval_block;
struct polyval_ctx {
// Note that the order of |S|, |H| and |Htable| is fixed by the MOVBE-based,
// x86-64, GHASH assembly. Additionally, some assembly routines require
// |Htable| to be 16-byte aligned.
polyval_block S;
u128 H;
alignas(16) u128 Htable[16];
gmult_func gmult;
ghash_func ghash;
};
// CRYPTO_POLYVAL_init initialises |ctx| using |key|.
void CRYPTO_POLYVAL_init(struct polyval_ctx *ctx, const uint8_t key[16]);
// CRYPTO_POLYVAL_update_blocks updates the accumulator in |ctx| given the
// blocks from |in|. Only a whole number of blocks can be processed so |in_len|
// must be a multiple of 16.
void CRYPTO_POLYVAL_update_blocks(struct polyval_ctx *ctx, const uint8_t *in,
size_t in_len);
// CRYPTO_POLYVAL_finish writes the accumulator from |ctx| to |out|.
void CRYPTO_POLYVAL_finish(const struct polyval_ctx *ctx, uint8_t out[16]);
#if defined(__cplusplus)
} // extern C
#endif
#endif // OPENSSL_HEADER_MODES_INTERNAL_H