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- Added and updated cipher error codes and documentation

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This commit is contained in:
Paul Bakker 2011-06-09 15:42:02 +00:00
parent 343a870daa
commit ff61a78a27
3 changed files with 76 additions and 37 deletions
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63
library/cipher.c
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@ -243,12 +243,12 @@ const cipher_info_t *cipher_info_from_string( const char *cipher_name )
int cipher_init_ctx( cipher_context_t *ctx, const cipher_info_t *cipher_info )
{
if( NULL == cipher_info || NULL == ctx )
return 1;
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
memset( ctx, 0, sizeof( ctx ) );
if( NULL == ( ctx->cipher_ctx = cipher_info->base->ctx_alloc_func() ) )
return 2;
return POLARSSL_ERR_CIPHER_ALLOC_FAILED;
ctx->cipher_info = cipher_info;
@ -258,7 +258,7 @@ int cipher_init_ctx( cipher_context_t *ctx, const cipher_info_t *cipher_info )
int cipher_free_ctx( cipher_context_t *ctx )
{
if( ctx == NULL || ctx->cipher_info == NULL )
return 1;
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
ctx->cipher_info->base->ctx_free_func( ctx->cipher_ctx );
@ -269,7 +269,7 @@ int cipher_setkey( cipher_context_t *ctx, const unsigned char *key,
int key_length, const operation_t operation )
{
if( NULL == ctx || NULL == ctx->cipher_info )
return 1;
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
ctx->key_length = key_length;
ctx->operation = operation;
@ -289,13 +289,13 @@ int cipher_setkey( cipher_context_t *ctx, const unsigned char *key,
return ctx->cipher_info->base->setkey_dec_func( ctx->cipher_ctx, key,
ctx->key_length );
return 1;
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
}
int cipher_reset( cipher_context_t *ctx, const unsigned char *iv )
{
if( NULL == ctx || NULL == ctx->cipher_info || NULL == iv )
return 1;
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
ctx->unprocessed_len = 0;
@ -307,12 +307,13 @@ int cipher_reset( cipher_context_t *ctx, const unsigned char *iv )
int cipher_update( cipher_context_t *ctx, const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen )
{
int ret;
size_t copy_len = 0;
if( NULL == ctx || NULL == ctx->cipher_info || NULL == olen ||
input == output )
{
return 1;
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
}
*olen = 0;
@ -344,11 +345,11 @@ int cipher_update( cipher_context_t *ctx, const unsigned char *input, size_t ile
memcpy( &( ctx->unprocessed_data[ctx->unprocessed_len] ), input,
copy_len );
if( 0 != ctx->cipher_info->base->cbc_func( ctx->cipher_ctx,
if( 0 != ( ret = ctx->cipher_info->base->cbc_func( ctx->cipher_ctx,
ctx->operation, cipher_get_block_size( ctx ), ctx->iv,
ctx->unprocessed_data, output) )
ctx->unprocessed_data, output ) ) )
{
return 1;
return ret;
}
*olen += cipher_get_block_size( ctx );
@ -380,10 +381,10 @@ int cipher_update( cipher_context_t *ctx, const unsigned char *input, size_t ile
*/
if( ilen )
{
if( 0 != ctx->cipher_info->base->cbc_func( ctx->cipher_ctx,
ctx->operation, ilen, ctx->iv, input, output ) )
if( 0 != ( ret = ctx->cipher_info->base->cbc_func( ctx->cipher_ctx,
ctx->operation, ilen, ctx->iv, input, output ) ) )
{
return 1;
return ret;
}
*olen += ilen;
}
@ -393,11 +394,11 @@ int cipher_update( cipher_context_t *ctx, const unsigned char *input, size_t ile
if( ctx->cipher_info->mode == POLARSSL_MODE_CFB128 )
{
if( 0 != ctx->cipher_info->base->cfb128_func( ctx->cipher_ctx,
if( 0 != ( ret = ctx->cipher_info->base->cfb128_func( ctx->cipher_ctx,
ctx->operation, ilen, &ctx->unprocessed_len, ctx->iv,
input, output ) )
input, output ) ) )
{
return 1;
return ret;
}
*olen = ilen;
@ -407,11 +408,11 @@ int cipher_update( cipher_context_t *ctx, const unsigned char *input, size_t ile
if( ctx->cipher_info->mode == POLARSSL_MODE_CTR )
{
if( 0 != ctx->cipher_info->base->ctr_func( ctx->cipher_ctx,
if( 0 != ( ret = ctx->cipher_info->base->ctr_func( ctx->cipher_ctx,
ilen, &ctx->unprocessed_len, ctx->iv,
ctx->unprocessed_data, input, output ) )
ctx->unprocessed_data, input, output ) ) )
{
return 1;
return ret;
}
*olen = ilen;
@ -419,7 +420,7 @@ int cipher_update( cipher_context_t *ctx, const unsigned char *input, size_t ile
return 0;
}
return 1;
return POLARSSL_ERR_CIPHER_FEATURE_UNAVAILABLE;
}
static void add_pkcs_padding( unsigned char *output, size_t output_len,
@ -439,16 +440,16 @@ static int get_pkcs_padding( unsigned char *input, unsigned char input_len,
unsigned char padding_len = 0;
if( NULL == input || NULL == data_len )
return 1;
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
padding_len = input[input_len - 1];
if( padding_len > input_len )
return 2;
return POLARSSL_ERR_CIPHER_INVALID_PADDING;
for( i = input_len - padding_len; i < input_len; i++ )
if( input[i] != padding_len )
return 2;
return POLARSSL_ERR_CIPHER_INVALID_PADDING;
*data_len = input_len - padding_len;
@ -457,8 +458,10 @@ static int get_pkcs_padding( unsigned char *input, unsigned char input_len,
int cipher_finish( cipher_context_t *ctx, unsigned char *output, size_t *olen)
{
int ret = 0;
if( NULL == ctx || NULL == ctx->cipher_info || NULL == olen )
return 1;
return POLARSSL_ERR_CIPHER_BAD_INPUT_DATA;
*olen = 0;
@ -478,15 +481,15 @@ int cipher_finish( cipher_context_t *ctx, unsigned char *output, size_t *olen)
else if ( cipher_get_block_size( ctx ) != ctx->unprocessed_len )
{
/* For decrypt operations, expect a full block */
return 1;
return POLARSSL_ERR_CIPHER_FULL_BLOCK_EXPECTED;
}
/* cipher block */
if( 0 != ctx->cipher_info->base->cbc_func( ctx->cipher_ctx, ctx->operation,
cipher_get_block_size( ctx ), ctx->iv, ctx->unprocessed_data,
output ) )
if( 0 != ( ret = ctx->cipher_info->base->cbc_func( ctx->cipher_ctx,
ctx->operation, cipher_get_block_size( ctx ), ctx->iv,
ctx->unprocessed_data, output ) ) )
{
return 1;
return ret;
}
/* Set output size for decryption */
@ -498,7 +501,7 @@ int cipher_finish( cipher_context_t *ctx, unsigned char *output, size_t *olen)
return 0;
}
return 1;
return POLARSSL_ERR_CIPHER_FEATURE_UNAVAILABLE;
}
#if defined(POLARSSL_SELF_TEST)