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Made padding modes configurable from config.h

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This commit is contained in:
Paul Bakker 2013-08-14 12:21:18 +02:00
parent 1a45d91cf2
commit 48e93c84b7
2 changed files with 36 additions and 5 deletions
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15
include/polarssl/config.h
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@ -193,6 +193,21 @@
#define POLARSSL_CIPHER_NULL_CIPHER
*/
/**
* \def POLARSSL_CIPHER_PADDING_XXX
*
* Uncomment or comment macros to add support for specific padding modes
* in the cipher layer with cipher modes that support padding (e.g. CBC)
*
* If you disable all padding modes, only full blocks can be used with CBC.
*
* Enable padding modes in the cipher layer.
*/
#define POLARSSL_CIPHER_PADDING_PKCS7
#define POLARSSL_CIPHER_PADDING_ONE_AND_ZEROS
#define POLARSSL_CIPHER_PADDING_ZEROS_AND_LEN
#define POLARSSL_CIPHER_PADDING_ZEROS
/**
* \def POLARSSL_ENABLE_WEAK_CIPHERSUITES
*

26
library/cipher.c
View file

@ -326,7 +326,11 @@ int cipher_init_ctx( cipher_context_t *ctx, const cipher_info_t *cipher_info )
/*
* Ignore possible errors caused by a cipher mode that doesn't use padding
*/
#if defined(POLARSSL_CIPHER_PADDING_PKCS7)
(void) cipher_set_padding_mode( ctx, POLARSSL_PADDING_PKCS7 );
#else
(void) cipher_set_padding_mode( ctx, POLARSSL_PADDING_NONE );
#endif
return 0;
}
@ -526,6 +530,7 @@ int cipher_update( cipher_context_t *ctx, const unsigned char *input, size_t ile
return POLARSSL_ERR_CIPHER_FEATURE_UNAVAILABLE;
}
#if defined(POLARSSL_CIPHER_PADDING_PKCS7)
/*
* PKCS7 (and PKCS5) padding: fill with ll bytes, with ll = padding_len
*/
@ -560,7 +565,9 @@ static int get_pkcs_padding( unsigned char *input, size_t input_len,
return 0;
}
#endif /* POLARSSL_CIPHER_PADDING_PKCS7 */
#if defined(POLARSSL_CIPHER_PADDING_ONE_AND_ZEROS)
/*
* One and zeros padding: fill with 80 00 ... 00
*/
@ -593,7 +600,9 @@ static int get_one_and_zeros_padding( unsigned char *input, size_t input_len,
return 0;
}
#endif /* POLARSSL_CIPHER_PADDING_ONE_AND_ZEROS */
#if defined(POLARSSL_CIPHER_PADDING_ZEROS_AND_LEN)
/*
* Zeros and len padding: fill with 00 ... 00 ll, where ll is padding length
*/
@ -629,7 +638,9 @@ static int get_zeros_and_len_padding( unsigned char *input, size_t input_len,
return 0;
}
#endif /* POLARSSL_CIPHER_PADDING_ZEROS_AND_LEN */
#if defined(POLARSSL_CIPHER_PADDING_ZEROS)
/*
* Zero padding: fill with 00 ... 00
*/
@ -656,6 +667,7 @@ static int get_zeros_padding( unsigned char *input, size_t input_len,
return 0;
}
#endif /* POLARSSL_CIPHER_PADDING_ZEROS */
/*
* No padding: don't pad :)
@ -749,33 +761,37 @@ int cipher_set_padding_mode( cipher_context_t *ctx, cipher_padding_t mode )
switch( mode )
{
#if defined(POLARSSL_CIPHER_PADDING_PKCS7)
case POLARSSL_PADDING_PKCS7:
ctx->add_padding = add_pkcs_padding;
ctx->get_padding = get_pkcs_padding;
break;
#endif
#if defined(POLARSSL_CIPHER_PADDING_ONE_AND_ZEROS)
case POLARSSL_PADDING_ONE_AND_ZEROS:
ctx->add_padding = add_one_and_zeros_padding;
ctx->get_padding = get_one_and_zeros_padding;
break;
#endif
#if defined(POLARSSL_CIPHER_PADDING_ZEROS_AND_LEN)
case POLARSSL_PADDING_ZEROS_AND_LEN:
ctx->add_padding = add_zeros_and_len_padding;
ctx->get_padding = get_zeros_and_len_padding;
break;
#endif
#if defined(POLARSSL_CIPHER_PADDING_ZEROS)
case POLARSSL_PADDING_ZEROS:
ctx->add_padding = add_zeros_padding;
ctx->get_padding = get_zeros_padding;
break;
#endif
case POLARSSL_PADDING_NONE:
ctx->add_padding = NULL;
ctx->get_padding = get_no_padding;
break;
default:
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
return POLARSSL_ERR_CIPHER_FEATURE_UNAVAILABLE;
}
return 0;