diff options
Diffstat (limited to 'cipher/blowfish.c')
| -rw-r--r-- | cipher/blowfish.c | 56 |
1 files changed, 53 insertions, 3 deletions
diff --git a/cipher/blowfish.c b/cipher/blowfish.c index 466e8da67..ec686e1ee 100644 --- a/cipher/blowfish.c +++ b/cipher/blowfish.c @@ -38,6 +38,28 @@ #include "types.h" #include "blowfish.h" +#define CIPHER_ALGO_BLOWFISH 4 /* blowfish 128 bit key */ +#define CIPHER_ALGO_BLOWFISH160 42 /* blowfish 160 bit key (not in OpenPGP)*/ + +#define FNCCAST_SETKEY(f) (void(*)(void*, byte*, unsigned))(f) +#define FNCCAST_CRYPT(f) (void(*)(void*, byte*, byte*))(f) + +#define BLOWFISH_BLOCKSIZE 8 +#define BLOWFISH_ROUNDS 16 + +typedef struct { + u32 s0[256]; + u32 s1[256]; + u32 s2[256]; + u32 s3[256]; + u32 p[BLOWFISH_ROUNDS+2]; +} BLOWFISH_context; + +static void blowfish_setkey( BLOWFISH_context *c, byte *key, unsigned keylen ); +static void blowfish_encrypt_block( BLOWFISH_context *bc, byte *outbuf, byte *inbuf ); +static void blowfish_decrypt_block( BLOWFISH_context *bc, byte *outbuf, byte *inbuf ); + + /* precomputed S boxes */ static const u32 ks0[256] = { 0xD1310BA6,0x98DFB5AC,0x2FFD72DB,0xD01ADFB7,0xB8E1AFED,0x6A267E96, @@ -391,7 +413,7 @@ decrypt( BLOWFISH_context *bc, u32 *ret_xl, u32 *ret_xr ) #undef F #undef R -void +static void blowfish_encrypt_block( BLOWFISH_context *bc, byte *outbuf, byte *inbuf ) { u32 d1, d2; @@ -410,7 +432,7 @@ blowfish_encrypt_block( BLOWFISH_context *bc, byte *outbuf, byte *inbuf ) } -void +static void blowfish_decrypt_block( BLOWFISH_context *bc, byte *outbuf, byte *inbuf ) { u32 d1, d2; @@ -458,7 +480,7 @@ selftest() -void +static void blowfish_setkey( BLOWFISH_context *c, byte *key, unsigned keylen ) { int i, j; @@ -524,3 +546,31 @@ blowfish_setkey( BLOWFISH_context *c, byte *key, unsigned keylen ) } +/**************** + * Return some information about the algorithm. We need algo here to + * distinguish different flavors of the algorithm. + * Returns: A pointer to string describing the algorithm or NULL if + * the ALGO is invalid. + */ +const char * +blowfish_get_info( int algo, size_t *keylen, + size_t *blocksize, size_t *contextsize, + void (**setkey)( void *c, byte *key, unsigned keylen ), + void (**encrypt)( void *c, byte *outbuf, byte *inbuf ), + void (**decrypt)( void *c, byte *outbuf, byte *inbuf ) + ) +{ + *keylen = algo == CIPHER_ALGO_BLOWFISH ? 128 : 160; + *blocksize = BLOWFISH_BLOCKSIZE; + *contextsize = sizeof(BLOWFISH_context); + *setkey = FNCCAST_SETKEY(blowfish_setkey); + *encrypt= FNCCAST_CRYPT(blowfish_encrypt_block); + *decrypt= FNCCAST_CRYPT(blowfish_decrypt_block); + + if( algo == CIPHER_ALGO_BLOWFISH ) + return "BLOWFISH"; + if( algo == CIPHER_ALGO_BLOWFISH160 ) + return "BLOWFISH160"; + return NULL; +} + |