blowfish.c File Reference

#include "mbedtls/config.h"
#include "mbedtls/blowfish.h"
#include <string.h>
#include "arc4_alt.h"

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Macros
#define	GET_UINT32_BE(n, b, i)
#define	PUT_UINT32_BE(n, b, i)

Functions
static uint32_t	F (mbedtls_blowfish_context *ctx, uint32_t x)
static void	blowfish_enc (mbedtls_blowfish_context *ctx, uint32_t *xl, uint32_t *xr)
static void	blowfish_dec (mbedtls_blowfish_context *ctx, uint32_t *xl, uint32_t *xr)
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...

Variables
static const uint32_t	P [MBEDTLS_BLOWFISH_ROUNDS+2]
static const uint32_t	S [4][256]

Macro Definition Documentation

GET_UINT32_BE

#define GET_UINT32_BE	(		n,
			b,
			i
	)

Value:

{                                                       \
    (n) = ( (uint32_t) (b)[(i)    ] << 24 )             \
        | ( (uint32_t) (b)[(i) + 1] << 16 )             \
        | ( (uint32_t) (b)[(i) + 2] <<  8 )             \
        | ( (uint32_t) (b)[(i) + 3]       );            \
}

PUT_UINT32_BE

#define PUT_UINT32_BE	(		n,
			b,
			i
	)

Value:

{                                                       \
    (b)[(i)    ] = (unsigned char) ( (n) >> 24 );       \
    (b)[(i) + 1] = (unsigned char) ( (n) >> 16 );       \
    (b)[(i) + 2] = (unsigned char) ( (n) >>  8 );       \
    (b)[(i) + 3] = (unsigned char) ( (n)       );       \
}

Function Documentation

blowfish_dec()

static void blowfish_dec ( mbedtls_blowfish_context *  ctx, uint32_t *  xl, uint32_t *  xr  )

static

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blowfish_enc()

static void blowfish_enc ( mbedtls_blowfish_context *  ctx, uint32_t *  xl, uint32_t *  xr  )

static

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F()

static uint32_t F ( mbedtls_blowfish_context *  ctx, uint32_t  x  )

static

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mbedtls_blowfish_crypt_cbc()

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)

Note

Upon exit, the content of the IV is updated so that you can call the function same function again on the following block(s) of data and get the same result as if it was encrypted in one call. This allows a "streaming" usage. If on the other hand you need to retain the contents of the IV, you should either save it manually or use the cipher module instead.

Parameters

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

Returns

0 if successful, or MBEDTLS_ERR_BLOWFISH_INVALID_INPUT_LENGTH

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mbedtls_blowfish_crypt_cfb64()

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.

Note

Upon exit, the content of the IV is updated so that you can call the function same function again on the following block(s) of data and get the same result as if it was encrypted in one call. This allows a "streaming" usage. If on the other hand you need to retain the contents of the IV, you should either save it manually or use the cipher module instead.

Parameters

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

Returns

0 if successful

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mbedtls_blowfish_crypt_ctr()

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.

Warning: You have to keep the maximum use of your counter in mind!

Parameters

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

Returns

0 if successful

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mbedtls_blowfish_crypt_ecb()

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.

Parameters

ctx	Blowfish context
mode	MBEDTLS_BLOWFISH_ENCRYPT or MBEDTLS_BLOWFISH_DECRYPT
input	8-byte input block
output	8-byte output block

Returns

0 if successful

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mbedtls_blowfish_free()

void mbedtls_blowfish_free

(

mbedtls_blowfish_context *

ctx

)

Clear Blowfish context.

Parameters

ctx	Blowfish context to be cleared

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mbedtls_blowfish_init()

void mbedtls_blowfish_init

(

mbedtls_blowfish_context *

ctx

)

Initialize Blowfish context.

Parameters

ctx	Blowfish context to be initialized

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mbedtls_blowfish_setkey()

int mbedtls_blowfish_setkey	(	mbedtls_blowfish_context *	ctx,
		const unsigned char *	key,
		unsigned int	keybits
	)

Blowfish key schedule.

Parameters

ctx	Blowfish context to be initialized
key	encryption key
keybits	must be between 32 and 448 bits

Returns

0 if successful, or MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH

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Variable Documentation

P

const uint32_t P[MBEDTLS_BLOWFISH_ROUNDS+2]

static

Initial value:

= {
        0x243F6A88L, 0x85A308D3L, 0x13198A2EL, 0x03707344L,
        0xA4093822L, 0x299F31D0L, 0x082EFA98L, 0xEC4E6C89L,
        0x452821E6L, 0x38D01377L, 0xBE5466CFL, 0x34E90C6CL,
        0xC0AC29B7L, 0xC97C50DDL, 0x3F84D5B5L, 0xB5470917L,
        0x9216D5D9L, 0x8979FB1BL
}

S

const uint32_t S[4][256]

static