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cipher: Add wrappers for AES-XTS

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AES-XTS does not support multipart use as it can only operate on an entire
sector at a time.
This commit is contained in:
Jaeden Amero
2018-04-30 17:17:41 +01:00
parent 425382d4fb
commit c653990ed5
5 changed files with 260 additions and 1 deletions
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22
library/cipher.c
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@ -456,6 +456,27 @@ int mbedtls_cipher_update( mbedtls_cipher_context_t *ctx, const unsigned char *i
}
#endif /* MBEDTLS_CIPHER_MODE_CTR */
#if defined(MBEDTLS_CIPHER_MODE_XTS)
if( ctx->cipher_info->mode == MBEDTLS_MODE_XTS )
{
if( ctx->unprocessed_len > 0 ) {
/* We can only process an entire data unit at a time. */
return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE );
}
ret = ctx->cipher_info->base->xts_func( ctx->cipher_ctx,
ctx->operation, ilen, ctx->iv, input, output );
if( ret != 0 )
{
return( ret );
}
*olen = ilen;
return( 0 );
}
#endif /* MBEDTLS_CIPHER_MODE_XTS */
#if defined(MBEDTLS_CIPHER_MODE_STREAM)
if( ctx->cipher_info->mode == MBEDTLS_MODE_STREAM )
{
@ -658,6 +679,7 @@ int mbedtls_cipher_finish( mbedtls_cipher_context_t *ctx,
MBEDTLS_MODE_OFB == ctx->cipher_info->mode ||
MBEDTLS_MODE_CTR == ctx->cipher_info->mode ||
MBEDTLS_MODE_GCM == ctx->cipher_info->mode ||
MBEDTLS_MODE_XTS == ctx->cipher_info->mode ||
MBEDTLS_MODE_STREAM == ctx->cipher_info->mode )
{
return( 0 );