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Add OFB block mode to AES-128/192/256

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Adds a new configuration of MBEDTLS_CIPHER_MODE_OFB and OFB mode to AES.
This commit is contained in:
Simon Butcher 2018-04-22 22:57:27 +01:00
parent c041435fcf
commit 76a5b22973
4 changed files with 80 additions and 1 deletions
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31
library/aes.c
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@ -1061,7 +1061,36 @@ int mbedtls_aes_crypt_cfb8( mbedtls_aes_context *ctx,
return( 0 );
}
#endif /*MBEDTLS_CIPHER_MODE_CFB */
#endif /* MBEDTLS_CIPHER_MODE_CFB */
#if defined(MBEDTLS_CIPHER_MODE_OFB)
/*
* AES-OFB (Output Feedback Mode) buffer encryption/decryption
*/
int mbedtls_aes_crypt_ofb( mbedtls_aes_context *ctx,
size_t length,
size_t *iv_off,
unsigned char iv[16],
const unsigned char *input,
unsigned char *output )
{
size_t n = *iv_off;
while( length-- )
{
if( n == 0 )
mbedtls_aes_crypt_ecb( ctx, MBEDTLS_AES_ENCRYPT, iv, iv );
*output++ = *input++ ^ iv[n];
n = ( n + 1 ) & 0x0F;
}
*iv_off = n;
return( 0 );
}
#endif /* MBEDTLS_CIPHER_MODE_OFB */
#if defined(MBEDTLS_CIPHER_MODE_CTR)
/*