diff options
Diffstat (limited to 'src/libstrongswan/plugins/des/des_crypter.c')
| -rw-r--r-- | src/libstrongswan/plugins/des/des_crypter.c | 107 |
1 files changed, 105 insertions, 2 deletions
diff --git a/src/libstrongswan/plugins/des/des_crypter.c b/src/libstrongswan/plugins/des/des_crypter.c index 43aff4dd1..a0b147c63 100644 --- a/src/libstrongswan/plugins/des/des_crypter.c +++ b/src/libstrongswan/plugins/des/des_crypter.c @@ -1,4 +1,6 @@ -/* Copyright (C) 2006 Martin Willi +/* + * Copyright (C) 2009 Tobias Brunner + * Copyright (C) 2006 Martin Willi * Hochschule fuer Technik Rapperswil * * Derived from Plutos DES library by Eric Young. @@ -55,7 +57,7 @@ * copied and put under another distribution licence * [including the GNU Public Licence.] * - * $Id: des_crypter.c 3910 2008-05-07 11:54:30Z martin $ + * $Id: des_crypter.c 4887 2009-02-19 14:29:25Z tobias $ */ #include "des_crypter.h" @@ -1107,6 +1109,65 @@ static void des_cbc_encrypt(des_cblock *input, des_cblock *output, long length, tin[0]=tin[1]=0; } +/** + * DES ECB encrypt decrypt routine + */ +static void des_ecb_encrypt(des_cblock *input, des_cblock *output, long length, + des_key_schedule schedule, int enc) +{ + register DES_LONG tin0,tin1; + register DES_LONG tout0,tout1; + register unsigned char *in,*out; + register long l=length; + DES_LONG tin[2]; + + in=(unsigned char *)input; + out=(unsigned char *)output; + + if (enc) + { + for (l-=8; l>=0; l-=8) + { + c2l(in,tin0); + c2l(in,tin1); + tin[0]=tin0; + tin[1]=tin1; + des_encrypt((DES_LONG *)tin,schedule,DES_ENCRYPT); + tout0=tin[0]; l2c(tout0,out); + tout1=tin[1]; l2c(tout1,out); + } + if (l != -8) + { + c2ln(in,tin0,tin1,l+8); + tin[0]=tin0; + tin[1]=tin1; + des_encrypt((DES_LONG *)tin,schedule,DES_ENCRYPT); + tout0=tin[0]; l2c(tout0,out); + tout1=tin[1]; l2c(tout1,out); + } + } + else + { + for (l-=8; l>=0; l-=8) + { + c2l(in,tin0); tin[0]=tin0; + c2l(in,tin1); tin[1]=tin1; + des_encrypt((DES_LONG *)tin,schedule,DES_DECRYPT); + l2c(tout0,out); + l2c(tout1,out); + } + if (l != -8) + { + c2l(in,tin0); tin[0]=tin0; + c2l(in,tin1); tin[1]=tin1; + des_encrypt((DES_LONG *)tin,schedule,DES_DECRYPT); + l2cn(tout0,tout1,out,l+8); + } + } + tin0=tin1=tout0=tout1=0; + tin[0]=tin[1]=0; +} + static void des_encrypt2(DES_LONG *data, des_key_schedule ks, int enc) { register DES_LONG l,r,t,u; @@ -1399,6 +1460,42 @@ static void encrypt(private_des_crypter_t *this, chunk_t data, chunk_t iv, } /** + * Implementation of crypter_t.decrypt for DES (ECB). + */ +static void decrypt_ecb(private_des_crypter_t *this, chunk_t data, chunk_t iv, + chunk_t *decrypted) +{ + u_int8_t *out; + + out = data.ptr; + if (decrypted) + { + *decrypted = chunk_alloc(data.len); + out = decrypted->ptr; + } + des_ecb_encrypt((des_cblock*)(data.ptr), (des_cblock*)out, + data.len, this->ks, DES_DECRYPT); +} + +/** + * Implementation of crypter_t.decrypt for DES (ECB). + */ +static void encrypt_ecb(private_des_crypter_t *this, chunk_t data, chunk_t iv, + chunk_t *encrypted) +{ + u_int8_t *out; + + out = data.ptr; + if (encrypted) + { + *encrypted = chunk_alloc(data.len); + out = encrypted->ptr; + } + des_ecb_encrypt((des_cblock*)(data.ptr), (des_cblock*)out, + data.len, this->ks, DES_ENCRYPT); +} + +/** * Implementation of crypter_t.decrypt for 3DES. */ static void decrypt3(private_des_crypter_t *this, chunk_t data, chunk_t iv, @@ -1509,6 +1606,12 @@ des_crypter_t *des_crypter_create(encryption_algorithm_t algo) this->public.crypter_interface.encrypt = (void (*) (crypter_t *, chunk_t,chunk_t, chunk_t *)) encrypt3; this->public.crypter_interface.decrypt = (void (*) (crypter_t *, chunk_t , chunk_t, chunk_t *)) decrypt3; break; + case ENCR_DES_ECB: + this->key_size = sizeof(des_cblock); + this->public.crypter_interface.set_key = (void (*) (crypter_t *,chunk_t)) set_key; + this->public.crypter_interface.encrypt = (void (*) (crypter_t *, chunk_t,chunk_t, chunk_t *)) encrypt_ecb; + this->public.crypter_interface.decrypt = (void (*) (crypter_t *, chunk_t , chunk_t, chunk_t *)) decrypt_ecb; + break; default: free(this); return NULL; |