X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/f164662363901292b83d452b107a4f630473144a..refs/pull/111/head:/armsrc/des.c diff --git a/armsrc/des.c b/armsrc/des.c index 0a27503e..a81df9c8 100644 --- a/armsrc/des.c +++ b/armsrc/des.c @@ -378,6 +378,60 @@ void tdes_dec(void* out, void* in, const uint8_t* key){ des_dec(out, out, (uint8_t*)key + 0); } +void tdes_2key_enc(void* out, const void* in, size_t length, const void* key, unsigned char iv[8]){ + + if( length % 8 ) return; + + uint8_t i; + uint8_t* tin = (uint8_t*) in; + uint8_t* tout = (uint8_t*) out; + + while( length > 0 ) + { + for ( i = 0; i < 8; i++ ) + tout[i] = (unsigned char)(tin[i] ^ iv[i]); + + des_enc(tout, tin, (uint8_t*)key + 0); + des_dec(tout, tout, (uint8_t*)key + 8); + des_enc(tout, tout, (uint8_t*)key + 0); + + memcpy(iv, tout, 8); + + tin += 8; + tout += 8; + length -= 8; + } +} + +void tdes_2key_dec(void* out, const void* in, size_t length, const void* key, unsigned char iv[8]){ + + if( length % 8 ) return; + + uint8_t i; + unsigned char temp[8]; + uint8_t* tin = (uint8_t*) in; + uint8_t* tout = (uint8_t*) out; + + while( length > 0 ) + { + memcpy(temp, tin, 8); + + des_dec(tout, tin, (uint8_t*)key + 0); + des_enc(tout, tout, (uint8_t*)key + 8); + des_dec(tout, tout, (uint8_t*)key + 0); + + for (i = 0; i < 8; i++) + tout[i] = (unsigned char)(tout[i] ^ iv[i]); + + memcpy(iv, temp, 8); + + tin += 8; + tout += 8; + length -= 8; + } +} + + /******************************************************************************/