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Added generic EAX and CCM implementations.

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This commit is contained in:
Thomas Pornin 2017-10-23 23:27:28 +02:00
parent 8e94ad2fcb
commit dddc412922
14 changed files with 4530 additions and 13 deletions
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667
inc/bearssl_block.h
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@ -136,6 +136,73 @@ extern "C" {
* chunked processing, provided that each chunk length (except possibly
* the last one) is a multiple of the block size.
*
* - `br_xxx_ctrcbc_keys`
*
* Context structure that contains the subkeys resulting from the
* key expansion. These subkeys are appropriate for doing combined
* CTR encryption/decryption and CBC-MAC, as used in the CCM and EAX
* authenticated encryption modes. The structure first field is
* called `vtable` and points to the appropriate OOP structure.
*
* - `br_xxx_ctrcbc_init(br_xxx_ctr_keys *ctx, const void *key, size_t len)`
*
* Perform key expansion: subkeys for combined CTR
* encryption/decryption and CBC-MAC are computed and written in the
* provided context structure. The key length MUST be adequate for
* the implemented block cipher. This function also sets the
* `vtable` field.
*
* - `br_xxx_ctrcbc_encrypt(const br_xxx_ctrcbc_keys *ctx, void *ctr, void *cbcmac, void *data, size_t len)`
*
* Perform CTR encryption of some data, and CBC-MAC. Processing is
* done "in place" (the output data replaces the input data). This
* function applies CTR encryption on the data, using a full
* block-size counter (i.e. for 128-bit blocks, the counter is
* incremented as a 128-bit value). The 'ctr' array contains the
* initial value for the counter (used in the first block) and it is
* updated with the new value after data processing. The 'cbcmac'
* value shall point to a block-sized value which is used as IV for
* CBC-MAC, computed over the encrypted data (output of CTR
* encryption); the resulting CBC-MAC is written over 'cbcmac' on
* output.
*
* The data length MUST be a multiple of the block size.
*
* - `br_xxx_ctrcbc_decrypt(const br_xxx_ctrcbc_keys *ctx, void *ctr, void *cbcmac, void *data, size_t len)`
*
* Perform CTR decryption of some data, and CBC-MAC. Processing is
* done "in place" (the output data replaces the input data). This
* function applies CTR decryption on the data, using a full
* block-size counter (i.e. for 128-bit blocks, the counter is
* incremented as a 128-bit value). The 'ctr' array contains the
* initial value for the counter (used in the first block) and it is
* updated with the new value after data processing. The 'cbcmac'
* value shall point to a block-sized value which is used as IV for
* CBC-MAC, computed over the encrypted data (input of CTR
* encryption); the resulting CBC-MAC is written over 'cbcmac' on
* output.
*
* The data length MUST be a multiple of the block size.
*
* - `br_xxx_ctrcbc_ctr(const br_xxx_ctrcbc_keys *ctx, void *ctr, void *data, size_t len)`
*
* Perform CTR encryption or decryption of the provided data. The
* data is processed "in place" (the output data replaces the input
* data). A full block-sized counter is applied (i.e. for 128-bit
* blocks, the counter is incremented as a 128-bit value). The 'ctr'
* array contains the initial value for the counter (used in the
* first block), and it is updated with the new value after data
* processing.
*
* The data length MUST be a multiple of the block size.
*
* - `br_xxx_ctrcbc_mac(const br_xxx_ctrcbc_keys *ctx, void *cbcmac, const void *data, size_t len)`
*
* Compute CBC-MAC over the provided data. The IV for CBC-MAC is
* provided as 'cbcmac'; the output is written over the same array.
* The data itself is untouched. The data length MUST be a multiple
* of the block size.
*
*
* It shall be noted that the key expansion functions return `void`. If
* the provided key length is not allowed, then there will be no error
@ -176,6 +243,41 @@ extern "C" {
*
* Pointer to the encryption/decryption function.
*
* For combined CTR/CBC-MAC encryption, the `vtable` has a slightly
* different structure:
*
* - `context_size`
*
* The size (in bytes) of the context structure for subkeys.
*
* - `block_size`
*
* The cipher block size (in bytes).
*
* - `log_block_size`
*
* The base-2 logarithm of cipher block size (e.g. 4 for blocks
* of 16 bytes).
*
* - `init`
*
* Pointer to the key expansion function.
*
* - `encrypt`
*
* Pointer to the CTR encryption + CBC-MAC function.
*
* - `decrypt`
*
* Pointer to the CTR decryption + CBC-MAC function.
*
* - `ctr`
*
* Pointer to the CTR encryption/decryption function.
*
* - `mac`
*
* Pointer to the CBC-MAC function.
*
* For block cipher "`xxx`", static, constant instances of these
* structures are defined, under the names:
@ -183,6 +285,7 @@ extern "C" {
* - `br_xxx_cbcenc_vtable`
* - `br_xxx_cbcdec_vtable`
* - `br_xxx_ctr_vtable`
* - `br_xxx_ctrcbc_vtable`
*
*
* ## Implemented Block Ciphers
@ -460,6 +563,132 @@ struct br_block_ctr_class_ {
const void *iv, uint32_t cc, void *data, size_t len);
};
/**
* \brief Class type for combined CTR and CBC-MAC implementations.
*
* A `br_block_ctrcbc_class` instance points to the functions implementing
* a specific block cipher, when used in CTR mode for encrypting or
* decrypting data, along with CBC-MAC.
*/
typedef struct br_block_ctrcbc_class_ br_block_ctrcbc_class;
struct br_block_ctrcbc_class_ {
/**
* \brief Size (in bytes) of the context structure appropriate
* for containing subkeys.
*/
size_t context_size;
/**
* \brief Size of individual blocks (in bytes).
*/
unsigned block_size;
/**
* \brief Base-2 logarithm of the size of individual blocks,
* expressed in bytes.
*/
unsigned log_block_size;
/**
* \brief Initialisation function.
*
* This function sets the `vtable` field in the context structure.
* The key length MUST be one of the key lengths supported by
* the implementation.
*
* \param ctx context structure to initialise.
* \param key secret key.
* \param key_len key length (in bytes).
*/
void (*init)(const br_block_ctrcbc_class **ctx,
const void *key, size_t key_len);
/**
* \brief Run the CTR encryption + CBC-MAC.
*
* The `ctr` parameter points to the counter; its length shall
* be equal to the block size. It is updated by this function
* as encryption proceeds.
*
* The `cbcmac` parameter points to the IV for CBC-MAC. The MAC
* is computed over the encrypted data (output of CTR
* encryption). Its length shall be equal to the block size. The
* computed CBC-MAC value is written over the `cbcmac` array.
*
* The data to encrypt is updated "in place". Its length (`len`
* bytes) MUST be a multiple of the block size.
*
* \param ctx context structure (already initialised).
* \param ctr counter for CTR encryption (initial and final).
* \param cbcmac IV and output buffer for CBC-MAC.
* \param data data to encrypt.
* \param len data length (in bytes).
*/
void (*encrypt)(const br_block_ctrcbc_class *const *ctx,
void *ctr, void *cbcmac, void *data, size_t len);
/**
* \brief Run the CTR decryption + CBC-MAC.
*
* The `ctr` parameter points to the counter; its length shall
* be equal to the block size. It is updated by this function
* as decryption proceeds.
*
* The `cbcmac` parameter points to the IV for CBC-MAC. The MAC
* is computed over the encrypted data (i.e. before CTR
* decryption). Its length shall be equal to the block size. The
* computed CBC-MAC value is written over the `cbcmac` array.
*
* The data to decrypt is updated "in place". Its length (`len`
* bytes) MUST be a multiple of the block size.
*
* \param ctx context structure (already initialised).
* \param ctr counter for CTR encryption (initial and final).
* \param cbcmac IV and output buffer for CBC-MAC.
* \param data data to decrypt.
* \param len data length (in bytes).
*/
void (*decrypt)(const br_block_ctrcbc_class *const *ctx,
void *ctr, void *cbcmac, void *data, size_t len);
/**
* \brief Run the CTR encryption/decryption only.
*
* The `ctr` parameter points to the counter; its length shall
* be equal to the block size. It is updated by this function
* as decryption proceeds.
*
* The data to decrypt is updated "in place". Its length (`len`
* bytes) MUST be a multiple of the block size.
*
* \param ctx context structure (already initialised).
* \param ctr counter for CTR encryption (initial and final).
* \param data data to decrypt.
* \param len data length (in bytes).
*/
void (*ctr)(const br_block_ctrcbc_class *const *ctx,
void *ctr, void *data, size_t len);
/**
* \brief Run the CBC-MAC only.
*
* The `cbcmac` parameter points to the IV for CBC-MAC. The MAC
* is computed over the encrypted data (i.e. before CTR
* decryption). Its length shall be equal to the block size. The
* computed CBC-MAC value is written over the `cbcmac` array.
*
* The data is unmodified. Its length (`len` bytes) MUST be a
* multiple of the block size.
*
* \param ctx context structure (already initialised).
* \param cbcmac IV and output buffer for CBC-MAC.
* \param data data to decrypt.
* \param len data length (in bytes).
*/
void (*mac)(const br_block_ctrcbc_class *const *ctx,
void *cbcmac, const void *data, size_t len);
};
/*
* Traditional, table-based AES implementation. It is fast, but uses
* internal tables (in particular a 1 kB table for encryption, another
@ -517,6 +746,22 @@ typedef struct {
#endif
} br_aes_big_ctr_keys;
/**
* \brief Context for AES subkeys (`aes_big` implementation, CTR encryption
* and decryption + CBC-MAC).
*
* First field is a pointer to the vtable; it is set by the initialisation
* function. Other fields are not supposed to be accessed by user code.
*/
typedef struct {
/** \brief Pointer to vtable for this context. */
const br_block_ctrcbc_class *vtable;
#ifndef BR_DOXYGEN_IGNORE
uint32_t skey[60];
unsigned num_rounds;
#endif
} br_aes_big_ctrcbc_keys;
/**
* \brief Class instance for AES CBC encryption (`aes_big` implementation).
*/
@ -533,6 +778,12 @@ extern const br_block_cbcdec_class br_aes_big_cbcdec_vtable;
*/
extern const br_block_ctr_class br_aes_big_ctr_vtable;
/**
* \brief Class instance for AES CTR encryption/decryption + CBC-MAC
* (`aes_big` implementation).
*/
extern const br_block_ctrcbc_class br_aes_big_ctrcbc_vtable;
/**
* \brief Context initialisation (key schedule) for AES CBC encryption
* (`aes_big` implementation).
@ -566,6 +817,17 @@ void br_aes_big_cbcdec_init(br_aes_big_cbcdec_keys *ctx,
void br_aes_big_ctr_init(br_aes_big_ctr_keys *ctx,
const void *key, size_t len);
/**
* \brief Context initialisation (key schedule) for AES CTR + CBC-MAC
* (`aes_big` implementation).
*
* \param ctx context to initialise.
* \param key secret key.
* \param len secret key length (in bytes).
*/
void br_aes_big_ctrcbc_init(br_aes_big_ctrcbc_keys *ctx,
const void *key, size_t len);
/**
* \brief CBC encryption with AES (`aes_big` implementation).
*
@ -594,13 +856,59 @@ void br_aes_big_cbcdec_run(const br_aes_big_cbcdec_keys *ctx, void *iv,
* \param ctx context (already initialised).
* \param iv IV (constant, 12 bytes).
* \param cc initial block counter value.
* \param data data to decrypt (updated).
* \param data data to encrypt or decrypt (updated).
* \param len data length (in bytes).
* \return new block counter value.
*/
uint32_t br_aes_big_ctr_run(const br_aes_big_ctr_keys *ctx,
const void *iv, uint32_t cc, void *data, size_t len);
/**
* \brief CTR encryption + CBC-MAC with AES (`aes_big` implementation).
*
* \param ctx context (already initialised).
* \param ctr counter for CTR (16 bytes, updated).
* \param cbcmac IV for CBC-MAC (updated).
* \param data data to encrypt (updated).
* \param len data length (in bytes, MUST be a multiple of 16).
*/
void br_aes_big_ctrcbc_encrypt(const br_aes_big_ctrcbc_keys *ctx,
void *ctr, void *cbcmac, void *data, size_t len);
/**
* \brief CTR decryption + CBC-MAC with AES (`aes_big` implementation).
*
* \param ctx context (already initialised).
* \param ctr counter for CTR (16 bytes, updated).
* \param cbcmac IV for CBC-MAC (updated).
* \param data data to decrypt (updated).
* \param len data length (in bytes, MUST be a multiple of 16).
*/
void br_aes_big_ctrcbc_decrypt(const br_aes_big_ctrcbc_keys *ctx,
void *ctr, void *cbcmac, void *data, size_t len);
/**
* \brief CTR encryption/decryption with AES (`aes_big` implementation).
*
* \param ctx context (already initialised).
* \param ctr counter for CTR (16 bytes, updated).
* \param data data to MAC (updated).
* \param len data length (in bytes, MUST be a multiple of 16).
*/
void br_aes_big_ctrcbc_ctr(const br_aes_big_ctrcbc_keys *ctx,
void *ctr, void *data, size_t len);
/**
* \brief CBC-MAC with AES (`aes_big` implementation).
*
* \param ctx context (already initialised).
* \param cbcmac IV for CBC-MAC (updated).
* \param data data to MAC (unmodified).
* \param len data length (in bytes, MUST be a multiple of 16).
*/
void br_aes_big_ctrcbc_mac(const br_aes_big_ctrcbc_keys *ctx,
void *cbcmac, const void *data, size_t len);
/*
* AES implementation optimized for size. It is slower than the
* traditional table-based AES implementation, but requires much less
@ -658,6 +966,22 @@ typedef struct {
#endif
} br_aes_small_ctr_keys;
/**
* \brief Context for AES subkeys (`aes_small` implementation, CTR encryption
* and decryption + CBC-MAC).
*
* First field is a pointer to the vtable; it is set by the initialisation
* function. Other fields are not supposed to be accessed by user code.
*/
typedef struct {
/** \brief Pointer to vtable for this context. */
const br_block_ctrcbc_class *vtable;
#ifndef BR_DOXYGEN_IGNORE
uint32_t skey[60];
unsigned num_rounds;
#endif
} br_aes_small_ctrcbc_keys;
/**
* \brief Class instance for AES CBC encryption (`aes_small` implementation).
*/
@ -674,6 +998,12 @@ extern const br_block_cbcdec_class br_aes_small_cbcdec_vtable;
*/
extern const br_block_ctr_class br_aes_small_ctr_vtable;
/**
* \brief Class instance for AES CTR encryption/decryption + CBC-MAC
* (`aes_small` implementation).
*/
extern const br_block_ctrcbc_class br_aes_small_ctrcbc_vtable;
/**
* \brief Context initialisation (key schedule) for AES CBC encryption
* (`aes_small` implementation).
@ -707,6 +1037,17 @@ void br_aes_small_cbcdec_init(br_aes_small_cbcdec_keys *ctx,
void br_aes_small_ctr_init(br_aes_small_ctr_keys *ctx,
const void *key, size_t len);
/**
* \brief Context initialisation (key schedule) for AES CTR + CBC-MAC
* (`aes_small` implementation).
*
* \param ctx context to initialise.
* \param key secret key.
* \param len secret key length (in bytes).
*/
void br_aes_small_ctrcbc_init(br_aes_small_ctrcbc_keys *ctx,
const void *key, size_t len);
/**
* \brief CBC encryption with AES (`aes_small` implementation).
*
@ -742,6 +1083,52 @@ void br_aes_small_cbcdec_run(const br_aes_small_cbcdec_keys *ctx, void *iv,
uint32_t br_aes_small_ctr_run(const br_aes_small_ctr_keys *ctx,
const void *iv, uint32_t cc, void *data, size_t len);
/**
* \brief CTR encryption + CBC-MAC with AES (`aes_small` implementation).
*
* \param ctx context (already initialised).
* \param ctr counter for CTR (16 bytes, updated).
* \param cbcmac IV for CBC-MAC (updated).
* \param data data to encrypt (updated).
* \param len data length (in bytes, MUST be a multiple of 16).
*/
void br_aes_small_ctrcbc_encrypt(const br_aes_small_ctrcbc_keys *ctx,
void *ctr, void *cbcmac, void *data, size_t len);
/**
* \brief CTR decryption + CBC-MAC with AES (`aes_small` implementation).
*
* \param ctx context (already initialised).
* \param ctr counter for CTR (16 bytes, updated).
* \param cbcmac IV for CBC-MAC (updated).
* \param data data to decrypt (updated).
* \param len data length (in bytes, MUST be a multiple of 16).
*/
void br_aes_small_ctrcbc_decrypt(const br_aes_small_ctrcbc_keys *ctx,
void *ctr, void *cbcmac, void *data, size_t len);
/**
* \brief CTR encryption/decryption with AES (`aes_small` implementation).
*
* \param ctx context (already initialised).
* \param ctr counter for CTR (16 bytes, updated).
* \param data data to MAC (updated).
* \param len data length (in bytes, MUST be a multiple of 16).
*/
void br_aes_small_ctrcbc_ctr(const br_aes_small_ctrcbc_keys *ctx,
void *ctr, void *data, size_t len);
/**
* \brief CBC-MAC with AES (`aes_small` implementation).
*
* \param ctx context (already initialised).
* \param cbcmac IV for CBC-MAC (updated).
* \param data data to MAC (unmodified).
* \param len data length (in bytes, MUST be a multiple of 16).
*/
void br_aes_small_ctrcbc_mac(const br_aes_small_ctrcbc_keys *ctx,
void *cbcmac, const void *data, size_t len);
/*
* Constant-time AES implementation. Its size is similar to that of
* 'aes_big', and its performance is similar to that of 'aes_small' (faster
@ -798,6 +1185,22 @@ typedef struct {
#endif
} br_aes_ct_ctr_keys;
/**
* \brief Context for AES subkeys (`aes_ct` implementation, CTR encryption
* and decryption + CBC-MAC).
*
* First field is a pointer to the vtable; it is set by the initialisation
* function. Other fields are not supposed to be accessed by user code.
*/
typedef struct {
/** \brief Pointer to vtable for this context. */
const br_block_ctrcbc_class *vtable;
#ifndef BR_DOXYGEN_IGNORE
uint32_t skey[60];
unsigned num_rounds;
#endif
} br_aes_ct_ctrcbc_keys;
/**
* \brief Class instance for AES CBC encryption (`aes_ct` implementation).
*/
@ -814,6 +1217,12 @@ extern const br_block_cbcdec_class br_aes_ct_cbcdec_vtable;
*/
extern const br_block_ctr_class br_aes_ct_ctr_vtable;
/**
* \brief Class instance for AES CTR encryption/decryption + CBC-MAC
* (`aes_ct` implementation).
*/
extern const br_block_ctrcbc_class br_aes_ct_ctrcbc_vtable;
/**
* \brief Context initialisation (key schedule) for AES CBC encryption
* (`aes_ct` implementation).
@ -847,6 +1256,17 @@ void br_aes_ct_cbcdec_init(br_aes_ct_cbcdec_keys *ctx,
void br_aes_ct_ctr_init(br_aes_ct_ctr_keys *ctx,
const void *key, size_t len);
/**
* \brief Context initialisation (key schedule) for AES CTR + CBC-MAC
* (`aes_ct` implementation).
*
* \param ctx context to initialise.
* \param key secret key.
* \param len secret key length (in bytes).
*/
void br_aes_ct_ctrcbc_init(br_aes_ct_ctrcbc_keys *ctx,
const void *key, size_t len);
/**
* \brief CBC encryption with AES (`aes_ct` implementation).
*
@ -882,6 +1302,52 @@ void br_aes_ct_cbcdec_run(const br_aes_ct_cbcdec_keys *ctx, void *iv,
uint32_t br_aes_ct_ctr_run(const br_aes_ct_ctr_keys *ctx,
const void *iv, uint32_t cc, void *data, size_t len);
/**
* \brief CTR encryption + CBC-MAC with AES (`aes_ct` implementation).
*
* \param ctx context (already initialised).
* \param ctr counter for CTR (16 bytes, updated).
* \param cbcmac IV for CBC-MAC (updated).
* \param data data to encrypt (updated).
* \param len data length (in bytes, MUST be a multiple of 16).
*/
void br_aes_ct_ctrcbc_encrypt(const br_aes_ct_ctrcbc_keys *ctx,
void *ctr, void *cbcmac, void *data, size_t len);
/**
* \brief CTR decryption + CBC-MAC with AES (`aes_ct` implementation).
*
* \param ctx context (already initialised).
* \param ctr counter for CTR (16 bytes, updated).
* \param cbcmac IV for CBC-MAC (updated).
* \param data data to decrypt (updated).
* \param len data length (in bytes, MUST be a multiple of 16).
*/
void br_aes_ct_ctrcbc_decrypt(const br_aes_ct_ctrcbc_keys *ctx,
void *ctr, void *cbcmac, void *data, size_t len);
/**
* \brief CTR encryption/decryption with AES (`aes_ct` implementation).
*
* \param ctx context (already initialised).
* \param ctr counter for CTR (16 bytes, updated).
* \param data data to MAC (updated).
* \param len data length (in bytes, MUST be a multiple of 16).
*/
void br_aes_ct_ctrcbc_ctr(const br_aes_ct_ctrcbc_keys *ctx,
void *ctr, void *data, size_t len);
/**
* \brief CBC-MAC with AES (`aes_ct` implementation).
*
* \param ctx context (already initialised).
* \param cbcmac IV for CBC-MAC (updated).
* \param data data to MAC (unmodified).
* \param len data length (in bytes, MUST be a multiple of 16).
*/
void br_aes_ct_ctrcbc_mac(const br_aes_ct_ctrcbc_keys *ctx,
void *cbcmac, const void *data, size_t len);
/*
* 64-bit constant-time AES implementation. It is similar to 'aes_ct'
* but uses 64-bit registers, making it about twice faster than 'aes_ct'
@ -940,6 +1406,22 @@ typedef struct {
#endif
} br_aes_ct64_ctr_keys;
/**
* \brief Context for AES subkeys (`aes_ct64` implementation, CTR encryption
* and decryption + CBC-MAC).
*
* First field is a pointer to the vtable; it is set by the initialisation
* function. Other fields are not supposed to be accessed by user code.
*/
typedef struct {
/** \brief Pointer to vtable for this context. */
const br_block_ctrcbc_class *vtable;
#ifndef BR_DOXYGEN_IGNORE
uint64_t skey[30];
unsigned num_rounds;
#endif
} br_aes_ct64_ctrcbc_keys;
/**
* \brief Class instance for AES CBC encryption (`aes_ct64` implementation).
*/
@ -956,6 +1438,12 @@ extern const br_block_cbcdec_class br_aes_ct64_cbcdec_vtable;
*/
extern const br_block_ctr_class br_aes_ct64_ctr_vtable;
/**
* \brief Class instance for AES CTR encryption/decryption + CBC-MAC
* (`aes_ct64` implementation).
*/
extern const br_block_ctrcbc_class br_aes_ct64_ctrcbc_vtable;
/**
* \brief Context initialisation (key schedule) for AES CBC encryption
* (`aes_ct64` implementation).
@ -989,6 +1477,17 @@ void br_aes_ct64_cbcdec_init(br_aes_ct64_cbcdec_keys *ctx,
void br_aes_ct64_ctr_init(br_aes_ct64_ctr_keys *ctx,
const void *key, size_t len);
/**
* \brief Context initialisation (key schedule) for AES CTR + CBC-MAC
* (`aes_ct64` implementation).
*
* \param ctx context to initialise.
* \param key secret key.
* \param len secret key length (in bytes).
*/
void br_aes_ct64_ctrcbc_init(br_aes_ct64_ctrcbc_keys *ctx,
const void *key, size_t len);
/**
* \brief CBC encryption with AES (`aes_ct64` implementation).
*
@ -1024,6 +1523,52 @@ void br_aes_ct64_cbcdec_run(const br_aes_ct64_cbcdec_keys *ctx, void *iv,
uint32_t br_aes_ct64_ctr_run(const br_aes_ct64_ctr_keys *ctx,
const void *iv, uint32_t cc, void *data, size_t len);
/**
* \brief CTR encryption + CBC-MAC with AES (`aes_ct64` implementation).
*
* \param ctx context (already initialised).
* \param ctr counter for CTR (16 bytes, updated).
* \param cbcmac IV for CBC-MAC (updated).
* \param data data to encrypt (updated).
* \param len data length (in bytes, MUST be a multiple of 16).
*/
void br_aes_ct64_ctrcbc_encrypt(const br_aes_ct64_ctrcbc_keys *ctx,
void *ctr, void *cbcmac, void *data, size_t len);
/**
* \brief CTR decryption + CBC-MAC with AES (`aes_ct64` implementation).
*
* \param ctx context (already initialised).
* \param ctr counter for CTR (16 bytes, updated).
* \param cbcmac IV for CBC-MAC (updated).
* \param data data to decrypt (updated).
* \param len data length (in bytes, MUST be a multiple of 16).
*/
void br_aes_ct64_ctrcbc_decrypt(const br_aes_ct64_ctrcbc_keys *ctx,
void *ctr, void *cbcmac, void *data, size_t len);
/**
* \brief CTR encryption/decryption with AES (`aes_ct64` implementation).
*
* \param ctx context (already initialised).
* \param ctr counter for CTR (16 bytes, updated).
* \param data data to MAC (updated).
* \param len data length (in bytes, MUST be a multiple of 16).
*/
void br_aes_ct64_ctrcbc_ctr(const br_aes_ct64_ctrcbc_keys *ctx,
void *ctr, void *data, size_t len);
/**
* \brief CBC-MAC with AES (`aes_ct64` implementation).
*
* \param ctx context (already initialised).
* \param cbcmac IV for CBC-MAC (updated).
* \param data data to MAC (unmodified).
* \param len data length (in bytes, MUST be a multiple of 16).
*/
void br_aes_ct64_ctrcbc_mac(const br_aes_ct64_ctrcbc_keys *ctx,
void *cbcmac, const void *data, size_t len);
/*
* AES implementation using AES-NI opcodes (x86 platform).
*/
@ -1083,6 +1628,24 @@ typedef struct {
#endif
} br_aes_x86ni_ctr_keys;
/**
* \brief Context for AES subkeys (`aes_x86ni` implementation, CTR encryption
* and decryption + CBC-MAC).
*
* First field is a pointer to the vtable; it is set by the initialisation
* function. Other fields are not supposed to be accessed by user code.
*/
typedef struct {
/** \brief Pointer to vtable for this context. */
const br_block_ctrcbc_class *vtable;
#ifndef BR_DOXYGEN_IGNORE
union {
unsigned char skni[16 * 15];
} skey;
unsigned num_rounds;
#endif
} br_aes_x86ni_ctrcbc_keys;
/**
* \brief Class instance for AES CBC encryption (`aes_x86ni` implementation).
*
@ -1111,6 +1674,16 @@ extern const br_block_cbcdec_class br_aes_x86ni_cbcdec_vtable;
*/
extern const br_block_ctr_class br_aes_x86ni_ctr_vtable;
/**
* \brief Class instance for AES CTR encryption/decryption + CBC-MAC
* (`aes_x86ni` implementation).
*
* Since this implementation might be omitted from the library, or the
* AES opcode unavailable on the current CPU, a pointer to this class
* instance should be obtained through `br_aes_x86ni_ctrcbc_get_vtable()`.
*/
extern const br_block_ctrcbc_class br_aes_x86ni_ctrcbc_vtable;
/**
* \brief Context initialisation (key schedule) for AES CBC encryption
* (`aes_x86ni` implementation).
@ -1144,6 +1717,17 @@ void br_aes_x86ni_cbcdec_init(br_aes_x86ni_cbcdec_keys *ctx,
void br_aes_x86ni_ctr_init(br_aes_x86ni_ctr_keys *ctx,
const void *key, size_t len);
/**
* \brief Context initialisation (key schedule) for AES CTR + CBC-MAC
* (`aes_x86ni` implementation).
*
* \param ctx context to initialise.
* \param key secret key.
* \param len secret key length (in bytes).
*/
void br_aes_x86ni_ctrcbc_init(br_aes_x86ni_ctrcbc_keys *ctx,
const void *key, size_t len);
/**
* \brief CBC encryption with AES (`aes_x86ni` implementation).
*
@ -1179,6 +1763,52 @@ void br_aes_x86ni_cbcdec_run(const br_aes_x86ni_cbcdec_keys *ctx, void *iv,
uint32_t br_aes_x86ni_ctr_run(const br_aes_x86ni_ctr_keys *ctx,
const void *iv, uint32_t cc, void *data, size_t len);
/**
* \brief CTR encryption + CBC-MAC with AES (`aes_x86ni` implementation).
*
* \param ctx context (already initialised).
* \param ctr counter for CTR (16 bytes, updated).
* \param cbcmac IV for CBC-MAC (updated).
* \param data data to encrypt (updated).
* \param len data length (in bytes, MUST be a multiple of 16).
*/
void br_aes_x86ni_ctrcbc_encrypt(const br_aes_x86ni_ctrcbc_keys *ctx,
void *ctr, void *cbcmac, void *data, size_t len);
/**
* \brief CTR decryption + CBC-MAC with AES (`aes_x86ni` implementation).
*
* \param ctx context (already initialised).
* \param ctr counter for CTR (16 bytes, updated).
* \param cbcmac IV for CBC-MAC (updated).
* \param data data to decrypt (updated).
* \param len data length (in bytes, MUST be a multiple of 16).
*/
void br_aes_x86ni_ctrcbc_decrypt(const br_aes_x86ni_ctrcbc_keys *ctx,
void *ctr, void *cbcmac, void *data, size_t len);
/**
* \brief CTR encryption/decryption with AES (`aes_x86ni` implementation).
*
* \param ctx context (already initialised).
* \param ctr counter for CTR (16 bytes, updated).
* \param data data to MAC (updated).
* \param len data length (in bytes, MUST be a multiple of 16).
*/
void br_aes_x86ni_ctrcbc_ctr(const br_aes_x86ni_ctrcbc_keys *ctx,
void *ctr, void *data, size_t len);
/**
* \brief CBC-MAC with AES (`aes_x86ni` implementation).
*
* \param ctx context (already initialised).
* \param cbcmac IV for CBC-MAC (updated).
* \param data data to MAC (unmodified).
* \param len data length (in bytes, MUST be a multiple of 16).
*/
void br_aes_x86ni_ctrcbc_mac(const br_aes_x86ni_ctrcbc_keys *ctx,
void *cbcmac, const void *data, size_t len);
/**
* \brief Obtain the `aes_x86ni` AES-CBC (encryption) implementation, if
* available.
@ -1188,7 +1818,7 @@ uint32_t br_aes_x86ni_ctr_run(const br_aes_x86ni_ctr_keys *ctx,
* opcodes are available on the currently running CPU. If either of
* these conditions is not met, then this function returns `NULL`.
*
* \return the `aes_x868ni` AES-CBC (encryption) implementation, or `NULL`.
* \return the `aes_x86ni` AES-CBC (encryption) implementation, or `NULL`.
*/
const br_block_cbcenc_class *br_aes_x86ni_cbcenc_get_vtable(void);
@ -1201,7 +1831,7 @@ const br_block_cbcenc_class *br_aes_x86ni_cbcenc_get_vtable(void);
* opcodes are available on the currently running CPU. If either of
* these conditions is not met, then this function returns `NULL`.
*
* \return the `aes_x868ni` AES-CBC (decryption) implementation, or `NULL`.
* \return the `aes_x86ni` AES-CBC (decryption) implementation, or `NULL`.
*/
const br_block_cbcdec_class *br_aes_x86ni_cbcdec_get_vtable(void);
@ -1213,10 +1843,23 @@ const br_block_cbcdec_class *br_aes_x86ni_cbcdec_get_vtable(void);
* opcodes are available on the currently running CPU. If either of
* these conditions is not met, then this function returns `NULL`.
*
* \return the `aes_x868ni` AES-CTR implementation, or `NULL`.
* \return the `aes_x86ni` AES-CTR implementation, or `NULL`.
*/
const br_block_ctr_class *br_aes_x86ni_ctr_get_vtable(void);
/**
* \brief Obtain the `aes_x86ni` AES-CTR + CBC-MAC implementation, if
* available.
*
* This function returns a pointer to `br_aes_x86ni_ctrcbc_vtable`, if
* that implementation was compiled in the library _and_ the x86 AES
* opcodes are available on the currently running CPU. If either of
* these conditions is not met, then this function returns `NULL`.
*
* \return the `aes_x86ni` AES-CTR implementation, or `NULL`.
*/
const br_block_ctrcbc_class *br_aes_x86ni_ctrcbc_get_vtable(void);
/*
* AES implementation using POWER8 opcodes.
*/
@ -1452,6 +2095,22 @@ typedef union {
br_aes_pwr8_ctr_keys c_pwr8;
} br_aes_gen_ctr_keys;
/**
* \brief Aggregate structure large enough to be used as context for
* subkeys (CTR encryption/decryption + CBC-MAC) for all AES implementations.
*/
typedef union {
const br_block_ctrcbc_class *vtable;
br_aes_big_ctrcbc_keys c_big;
br_aes_small_ctrcbc_keys c_small;
br_aes_ct_ctrcbc_keys c_ct;
br_aes_ct64_ctrcbc_keys c_ct64;
/* FIXME
br_aes_x86ni_ctrcbc_keys c_x86ni;
br_aes_pwr8_ctrcbc_keys c_pwr8;
*/
} br_aes_gen_ctrcbc_keys;
/*
* Traditional, table-based implementation for DES/3DES. Since tables are
* used, cache-timing attacks are conceptually possible.