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Added cipher_info_from_values() to cipher layer (Search by ID+keylen+mode)

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This commit is contained in:
Paul Bakker 2013-09-09 00:08:26 +02:00
parent 5e0efa7ef5
commit f46b6955e3
2 changed files with 195 additions and 0 deletions
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16
include/polarssl/cipher.h
View File

@ -285,6 +285,22 @@ const cipher_info_t *cipher_info_from_string( const char *cipher_name );
*/ */
const cipher_info_t *cipher_info_from_type( const cipher_type_t cipher_type ); const cipher_info_t *cipher_info_from_type( const cipher_type_t cipher_type );
/**
* \brief Returns the cipher information structure associated
* with the given cipher id, key size and mode.
*
* \param cipher_id Id of the cipher to search for
* (e.g. POLARSSL_CIPHER_ID_AES)
* \param key_length Length of the key in bits
* \param mode Cipher mode (e.g. POLARSSL_MODE_CBC)
*
* \return the cipher information structure associated with the
* given cipher_type, or NULL if not found.
*/
const cipher_info_t *cipher_info_from_values( const cipher_id_t cipher_id,
int key_length,
const cipher_mode_t mode );
/** /**
* \brief Initialises and fills the cipher context structure with * \brief Initialises and fills the cipher context structure with
* the appropriate values. * the appropriate values.

179
library/cipher.c
View File

@ -379,6 +379,185 @@ const cipher_info_t *cipher_info_from_string( const char *cipher_name )
return NULL; return NULL;
} }
const cipher_info_t *cipher_info_from_values( const cipher_id_t cipher_id,
int key_length,
const cipher_mode_t mode )
{
#if defined(POLARSSL_AES_C)
if( cipher_id == POLARSSL_CIPHER_ID_AES )
{
if( mode == POLARSSL_MODE_ECB )
{
if( key_length == 128 )
return &aes_128_ecb_info;
if( key_length == 192 )
return &aes_192_ecb_info;
if( key_length == 256 )
return &aes_256_ecb_info;
}
if( mode == POLARSSL_MODE_CBC )
{
if( key_length == 128 )
return &aes_128_cbc_info;
if( key_length == 192 )
return &aes_192_cbc_info;
if( key_length == 256 )
return &aes_256_cbc_info;
}
#if defined(POLARSSL_CIPHER_MODE_CFB)
if( mode == POLARSSL_MODE_CFB )
{
if( key_length == 128 )
return &aes_128_cfb128_info;
if( key_length == 192 )
return &aes_192_cfb128_info;
if( key_length == 256 )
return &aes_256_cfb128_info;
}
#endif /* defined(POLARSSL_CIPHER_MODE_CFB) */
#if defined(POLARSSL_CIPHER_MODE_CTR)
if( mode == POLARSSL_MODE_CTR )
{
if( key_length == 128 )
return &aes_128_ctr_info;
if( key_length == 192 )
return &aes_192_ctr_info;
if( key_length == 256 )
return &aes_256_ctr_info;
}
#endif /* defined(POLARSSL_CIPHER_MODE_CTR) */
#if defined(POLARSSL_GCM_C)
if( mode == POLARSSL_MODE_GCM )
{
if( key_length == 128 )
return &aes_128_gcm_info;
if( key_length == 192 )
return &aes_192_gcm_info;
if( key_length == 256 )
return &aes_256_gcm_info;
}
#endif /* defined(POLARSSL_GCM_C) */
}
#endif
#if defined(POLARSSL_CAMELLIA_C)
if( cipher_id == POLARSSL_CIPHER_ID_CAMELLIA )
{
if( mode == POLARSSL_MODE_ECB )
{
if( key_length == 128 )
return &camellia_128_ecb_info;
if( key_length == 192 )
return &camellia_192_ecb_info;
if( key_length == 256 )
return &camellia_256_ecb_info;
}
if( mode == POLARSSL_MODE_CBC )
{
if( key_length == 128 )
return &camellia_128_cbc_info;
if( key_length == 192 )
return &camellia_192_cbc_info;
if( key_length == 256 )
return &camellia_256_cbc_info;
}
#if defined(POLARSSL_CIPHER_MODE_CFB)
if( mode == POLARSSL_MODE_CFB )
{
if( key_length == 128 )
return &camellia_128_cfb128_info;
if( key_length == 192 )
return &camellia_192_cfb128_info;
if( key_length == 256 )
return &camellia_256_cfb128_info;
}
#endif /* defined(POLARSSL_CIPHER_MODE_CFB) */
#if defined(POLARSSL_CIPHER_MODE_CTR)
if( mode == POLARSSL_MODE_CTR )
{
if( key_length == 128 )
return &camellia_128_ctr_info;
if( key_length == 192 )
return &camellia_192_ctr_info;
if( key_length == 256 )
return &camellia_256_ctr_info;
}
#endif /* defined(POLARSSL_CIPHER_MODE_CTR) */
}
#endif
#if defined(POLARSSL_DES_C)
if( cipher_id == POLARSSL_CIPHER_ID_DES )
{
if( mode == POLARSSL_MODE_ECB )
return &des_ecb_info;
if( mode == POLARSSL_MODE_CBC )
return &des_cbc_info;
}
if( cipher_id == POLARSSL_CIPHER_ID_3DES )
{
if( mode == POLARSSL_MODE_ECB )
{
if( key_length == 128 )
return &des_ede_ecb_info;
if( key_length == 192 )
return &des_ede3_ecb_info;
}
if( mode == POLARSSL_MODE_CBC )
{
if( key_length == 128 )
return &des_ede_cbc_info;
if( key_length == 192 )
return &des_ede3_cbc_info;
}
}
#endif
#if defined(POLARSSL_ARC4_C)
if( cipher_id == POLARSSL_CIPHER_ID_ARC4 )
if( mode == POLARSSL_MODE_STREAM )
return &arc4_128_info;
#endif
#if defined(POLARSSL_BLOWFISH_C)
if( cipher_id == POLARSSL_CIPHER_ID_BLOWFISH )
{
if( mode == POLARSSL_MODE_ECB )
return &blowfish_ecb_info;
if( mode == POLARSSL_MODE_CBC )
return &blowfish_cbc_info;
#if defined(POLARSSL_CIPHER_MODE_CFB)
if( mode == POLARSSL_MODE_CFB )
return &blowfish_cfb64_info;
#endif /* defined(POLARSSL_CIPHER_MODE_CFB) */
#if defined(POLARSSL_CIPHER_MODE_CTR)
if( mode == POLARSSL_MODE_CTR )
return &blowfish_ctr_info;
#endif /* defined(POLARSSL_CIPHER_MODE_CTR) */
}
#endif
#if defined(POLARSSL_CIPHER_NULL_CIPHER)
if( cipher_id == POLARSSL_CIPHER_ID_NULL )
return &null_cipher_info;
#endif /* defined(POLARSSL_CIPHER_NULL_CIPHER) */
return NULL;
}
int cipher_init_ctx( cipher_context_t *ctx, const cipher_info_t *cipher_info ) int cipher_init_ctx( cipher_context_t *ctx, const cipher_info_t *cipher_info )
{ {
if( NULL == cipher_info || NULL == ctx ) if( NULL == cipher_info || NULL == ctx )