mbed TLS v2.11.0
|
Blowfish block cipher. More...
Go to the source code of this file.
Data Structures | |
struct | mbedtls_blowfish_context |
Blowfish context structure. More... | |
Macros | |
#define | MBEDTLS_BLOWFISH_ENCRYPT 1 |
#define | MBEDTLS_BLOWFISH_DECRYPT 0 |
#define | MBEDTLS_BLOWFISH_MAX_KEY_BITS 448 |
#define | MBEDTLS_BLOWFISH_MIN_KEY_BITS 32 |
#define | MBEDTLS_BLOWFISH_ROUNDS 16 |
#define | MBEDTLS_BLOWFISH_BLOCKSIZE 8 /* Blowfish uses 64 bit blocks */ |
#define | MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH -0x0016 |
#define | MBEDTLS_ERR_BLOWFISH_HW_ACCEL_FAILED -0x0017 |
#define | MBEDTLS_ERR_BLOWFISH_INVALID_INPUT_LENGTH -0x0018 |
Functions | |
void | mbedtls_blowfish_init (mbedtls_blowfish_context *ctx) |
Initialize Blowfish context. More... | |
void | mbedtls_blowfish_free (mbedtls_blowfish_context *ctx) |
Clear Blowfish context. More... | |
int | mbedtls_blowfish_setkey (mbedtls_blowfish_context *ctx, const unsigned char *key, unsigned int keybits) |
Blowfish key schedule. More... | |
int | mbedtls_blowfish_crypt_ecb (mbedtls_blowfish_context *ctx, int mode, const unsigned char input[MBEDTLS_BLOWFISH_BLOCKSIZE], unsigned char output[MBEDTLS_BLOWFISH_BLOCKSIZE]) |
Blowfish-ECB block encryption/decryption. More... | |
int | mbedtls_blowfish_crypt_cbc (mbedtls_blowfish_context *ctx, int mode, size_t length, unsigned char iv[MBEDTLS_BLOWFISH_BLOCKSIZE], const unsigned char *input, unsigned char *output) |
Blowfish-CBC buffer encryption/decryption Length should be a multiple of the block size (8 bytes) More... | |
int | mbedtls_blowfish_crypt_cfb64 (mbedtls_blowfish_context *ctx, int mode, size_t length, size_t *iv_off, unsigned char iv[MBEDTLS_BLOWFISH_BLOCKSIZE], const unsigned char *input, unsigned char *output) |
Blowfish CFB buffer encryption/decryption. More... | |
int | mbedtls_blowfish_crypt_ctr (mbedtls_blowfish_context *ctx, size_t length, size_t *nc_off, unsigned char nonce_counter[MBEDTLS_BLOWFISH_BLOCKSIZE], unsigned char stream_block[MBEDTLS_BLOWFISH_BLOCKSIZE], const unsigned char *input, unsigned char *output) |
Blowfish-CTR buffer encryption/decryption. More... | |
Blowfish block cipher.
Definition in file blowfish.h.
#define MBEDTLS_BLOWFISH_BLOCKSIZE 8 /* Blowfish uses 64 bit blocks */ |
Definition at line 41 of file blowfish.h.
#define MBEDTLS_BLOWFISH_DECRYPT 0 |
Definition at line 37 of file blowfish.h.
#define MBEDTLS_BLOWFISH_ENCRYPT 1 |
Definition at line 36 of file blowfish.h.
#define MBEDTLS_BLOWFISH_MAX_KEY_BITS 448 |
Definition at line 38 of file blowfish.h.
#define MBEDTLS_BLOWFISH_MIN_KEY_BITS 32 |
Definition at line 39 of file blowfish.h.
#define MBEDTLS_BLOWFISH_ROUNDS 16 |
Rounds to use. When increasing this value, make sure to extend the initialisation vectors
Definition at line 40 of file blowfish.h.
#define MBEDTLS_ERR_BLOWFISH_HW_ACCEL_FAILED -0x0017 |
Blowfish hardware accelerator failed.
Definition at line 44 of file blowfish.h.
#define MBEDTLS_ERR_BLOWFISH_INVALID_INPUT_LENGTH -0x0018 |
Invalid data input length.
Definition at line 45 of file blowfish.h.
#define MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH -0x0016 |
Invalid key length.
Definition at line 43 of file blowfish.h.
int mbedtls_blowfish_crypt_cbc | ( | mbedtls_blowfish_context * | ctx, |
int | mode, | ||
size_t | length, | ||
unsigned char | iv[MBEDTLS_BLOWFISH_BLOCKSIZE], | ||
const unsigned char * | input, | ||
unsigned char * | output | ||
) |
Blowfish-CBC buffer encryption/decryption Length should be a multiple of the block size (8 bytes)
ctx | Blowfish context |
mode | MBEDTLS_BLOWFISH_ENCRYPT or MBEDTLS_BLOWFISH_DECRYPT |
length | length of the input data |
iv | initialization vector (updated after use) |
input | buffer holding the input data |
output | buffer holding the output data |
int mbedtls_blowfish_crypt_cfb64 | ( | mbedtls_blowfish_context * | ctx, |
int | mode, | ||
size_t | length, | ||
size_t * | iv_off, | ||
unsigned char | iv[MBEDTLS_BLOWFISH_BLOCKSIZE], | ||
const unsigned char * | input, | ||
unsigned char * | output | ||
) |
Blowfish CFB buffer encryption/decryption.
ctx | Blowfish context |
mode | MBEDTLS_BLOWFISH_ENCRYPT or MBEDTLS_BLOWFISH_DECRYPT |
length | length of the input data |
iv_off | offset in IV (updated after use) |
iv | initialization vector (updated after use) |
input | buffer holding the input data |
output | buffer holding the output data |
int mbedtls_blowfish_crypt_ctr | ( | mbedtls_blowfish_context * | ctx, |
size_t | length, | ||
size_t * | nc_off, | ||
unsigned char | nonce_counter[MBEDTLS_BLOWFISH_BLOCKSIZE], | ||
unsigned char | stream_block[MBEDTLS_BLOWFISH_BLOCKSIZE], | ||
const unsigned char * | input, | ||
unsigned char * | output | ||
) |
Blowfish-CTR buffer encryption/decryption.
There are two common strategies for managing nonces with CTR:
nonce_counter
and nc_off
to 0 for the first call, and then preserve the values of nonce_counter
, nc_off
and stream_block
across calls to this function as they will be updated by this function.With this strategy, you must not encrypt more than 2**64 blocks of data with the same key.
nonce_counter
buffer in two areas: the first one used for a per-message nonce, handled by yourself, and the second one updated by this function internally.For example, you might reserve the first 4 bytes for the per-message nonce, and the last 4 bytes for internal use. In that case, before calling this function on a new message you need to set the first 4 bytes of nonce_counter
to your chosen nonce value, the last 4 to 0, and nc_off
to 0 (which will cause stream_block
to be ignored). That way, you can encrypt at most 2**32 messages of up to 2**32 blocks each with the same key.
The per-message nonce (or information sufficient to reconstruct it) needs to be communicated with the ciphertext and must be unique. The recommended way to ensure uniqueness is to use a message counter.
Note that for both stategies, sizes are measured in blocks and that a Blowfish block is 8 bytes.
stream_block
contains sensitive data. Its content must not be written to insecure storage and should be securely discarded as soon as it's no longer needed.ctx | Blowfish context |
length | The length of the data |
nc_off | The offset in the current stream_block (for resuming within current cipher stream). The offset pointer to should be 0 at the start of a stream. |
nonce_counter | The 64-bit nonce and counter. |
stream_block | The saved stream-block for resuming. Is overwritten by the function. |
input | The input data stream |
output | The output data stream |
int mbedtls_blowfish_crypt_ecb | ( | mbedtls_blowfish_context * | ctx, |
int | mode, | ||
const unsigned char | input[MBEDTLS_BLOWFISH_BLOCKSIZE], | ||
unsigned char | output[MBEDTLS_BLOWFISH_BLOCKSIZE] | ||
) |
Blowfish-ECB block encryption/decryption.
ctx | Blowfish context |
mode | MBEDTLS_BLOWFISH_ENCRYPT or MBEDTLS_BLOWFISH_DECRYPT |
input | 8-byte input block |
output | 8-byte output block |
void mbedtls_blowfish_free | ( | mbedtls_blowfish_context * | ctx | ) |
Clear Blowfish context.
ctx | Blowfish context to be cleared |
void mbedtls_blowfish_init | ( | mbedtls_blowfish_context * | ctx | ) |
Initialize Blowfish context.
ctx | Blowfish context to be initialized |
int mbedtls_blowfish_setkey | ( | mbedtls_blowfish_context * | ctx, |
const unsigned char * | key, | ||
unsigned int | keybits | ||
) |
Blowfish key schedule.
ctx | Blowfish context to be initialized |
key | encryption key |
keybits | must be between 32 and 448 bits |