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Add cipher abstraction and test cases for OFB block mode

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Adds OFB as additional block mode in the cipher abstraction, and additional
test cases for that block mode.
This commit is contained in:
Simon Butcher
2018-04-22 22:58:07 +01:00
parent 0301884f00
commit 8c0fd1e881
6 changed files with 218 additions and 1 deletions
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19
library/cipher.c
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@ -191,10 +191,11 @@ int mbedtls_cipher_setkey( mbedtls_cipher_context_t *ctx, const unsigned char *k
ctx->operation = operation;
/*
* For CFB and CTR mode always use the encryption key schedule
* For OFB, CFB and CTR mode always use the encryption key schedule
*/
if( MBEDTLS_ENCRYPT == operation ||
MBEDTLS_MODE_CFB == ctx->cipher_info->mode ||
MBEDTLS_MODE_OFB == ctx->cipher_info->mode ||
MBEDTLS_MODE_CTR == ctx->cipher_info->mode )
{
return ctx->cipher_info->base->setkey_enc_func( ctx->cipher_ctx, key,
@ -424,6 +425,21 @@ int mbedtls_cipher_update( mbedtls_cipher_context_t *ctx, const unsigned char *i
}
#endif /* MBEDTLS_CIPHER_MODE_CFB */
#if defined(MBEDTLS_CIPHER_MODE_OFB)
if( ctx->cipher_info->mode == MBEDTLS_MODE_OFB )
{
if( 0 != ( ret = ctx->cipher_info->base->ofb_func( ctx->cipher_ctx,
ilen, &ctx->unprocessed_len, ctx->iv, input, output ) ) )
{
return( ret );
}
*olen = ilen;
return( 0 );
}
#endif /* MBEDTLS_CIPHER_MODE_OFB */
#if defined(MBEDTLS_CIPHER_MODE_CTR)
if( ctx->cipher_info->mode == MBEDTLS_MODE_CTR )
{
@ -639,6 +655,7 @@ int mbedtls_cipher_finish( mbedtls_cipher_context_t *ctx,
*olen = 0;
if( MBEDTLS_MODE_CFB == ctx->cipher_info->mode ||
MBEDTLS_MODE_OFB == ctx->cipher_info->mode ||
MBEDTLS_MODE_CTR == ctx->cipher_info->mode ||
MBEDTLS_MODE_GCM == ctx->cipher_info->mode ||
MBEDTLS_MODE_STREAM == ctx->cipher_info->mode )