Add cipher abstraction and test cases for OFB block mode
Adds OFB as additional block mode in the cipher abstraction, and additional
test cases for that block mode.
diff --git a/library/cipher.c b/library/cipher.c
index 7369f48..0713fee 100644
--- a/library/cipher.c
+++ b/library/cipher.c
@@ -194,10 +194,11 @@
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,
@@ -427,6 +428,21 @@
}
#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 )
{
@@ -642,6 +658,7 @@
*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 )
diff --git a/library/cipher_wrap.c b/library/cipher_wrap.c
index dc76af8..f7d5737 100644
--- a/library/cipher_wrap.c
+++ b/library/cipher_wrap.c
@@ -138,6 +138,15 @@
}
#endif /* MBEDTLS_CIPHER_MODE_CFB */
+#if defined(MBEDTLS_CIPHER_MODE_OFB)
+static int aes_crypt_ofb_wrap( void *ctx, size_t length, size_t *iv_off,
+ unsigned char *iv, const unsigned char *input, unsigned char *output )
+{
+ return mbedtls_aes_crypt_ofb( (mbedtls_aes_context *) ctx, length, iv_off,
+ iv, input, output );
+}
+#endif /* MBEDTLS_CIPHER_MODE_OFB */
+
#if defined(MBEDTLS_CIPHER_MODE_CTR)
static int aes_crypt_ctr_wrap( void *ctx, size_t length, size_t *nc_off,
unsigned char *nonce_counter, unsigned char *stream_block,
@@ -187,6 +196,9 @@
#if defined(MBEDTLS_CIPHER_MODE_CFB)
aes_crypt_cfb128_wrap,
#endif
+#if defined(MBEDTLS_CIPHER_MODE_OFB)
+ aes_crypt_ofb_wrap,
+#endif
#if defined(MBEDTLS_CIPHER_MODE_CTR)
aes_crypt_ctr_wrap,
#endif
@@ -302,6 +314,41 @@
};
#endif /* MBEDTLS_CIPHER_MODE_CFB */
+#if defined(MBEDTLS_CIPHER_MODE_OFB)
+static const mbedtls_cipher_info_t aes_128_ofb_info = {
+ MBEDTLS_CIPHER_AES_128_OFB,
+ MBEDTLS_MODE_OFB,
+ 128,
+ "AES-128-OFB",
+ 16,
+ 0,
+ 16,
+ &aes_info
+};
+
+static const mbedtls_cipher_info_t aes_192_ofb_info = {
+ MBEDTLS_CIPHER_AES_192_OFB,
+ MBEDTLS_MODE_OFB,
+ 192,
+ "AES-192-OFB",
+ 16,
+ 0,
+ 16,
+ &aes_info
+};
+
+static const mbedtls_cipher_info_t aes_256_ofb_info = {
+ MBEDTLS_CIPHER_AES_256_OFB,
+ MBEDTLS_MODE_OFB,
+ 256,
+ "AES-256-OFB",
+ 16,
+ 0,
+ 16,
+ &aes_info
+};
+#endif /* MBEDTLS_CIPHER_MODE_OFB */
+
#if defined(MBEDTLS_CIPHER_MODE_CTR)
static const mbedtls_cipher_info_t aes_128_ctr_info = {
MBEDTLS_CIPHER_AES_128_CTR,
@@ -354,6 +401,9 @@
#if defined(MBEDTLS_CIPHER_MODE_CFB)
NULL,
#endif
+#if defined(MBEDTLS_CIPHER_MODE_OFB)
+ NULL,
+#endif
#if defined(MBEDTLS_CIPHER_MODE_CTR)
NULL,
#endif
@@ -417,6 +467,9 @@
#if defined(MBEDTLS_CIPHER_MODE_CFB)
NULL,
#endif
+#if defined(MBEDTLS_CIPHER_MODE_OFB)
+ NULL,
+#endif
#if defined(MBEDTLS_CIPHER_MODE_CTR)
NULL,
#endif
@@ -544,6 +597,9 @@
#if defined(MBEDTLS_CIPHER_MODE_CFB)
camellia_crypt_cfb128_wrap,
#endif
+#if defined(MBEDTLS_CIPHER_MODE_OFB)
+ NULL,
+#endif
#if defined(MBEDTLS_CIPHER_MODE_CTR)
camellia_crypt_ctr_wrap,
#endif
@@ -711,6 +767,9 @@
#if defined(MBEDTLS_CIPHER_MODE_CFB)
NULL,
#endif
+#if defined(MBEDTLS_CIPHER_MODE_OFB)
+ NULL,
+#endif
#if defined(MBEDTLS_CIPHER_MODE_CTR)
NULL,
#endif
@@ -774,6 +833,9 @@
#if defined(MBEDTLS_CIPHER_MODE_CFB)
NULL,
#endif
+#if defined(MBEDTLS_CIPHER_MODE_OFB)
+ NULL,
+#endif
#if defined(MBEDTLS_CIPHER_MODE_CTR)
NULL,
#endif
@@ -950,6 +1012,9 @@
#if defined(MBEDTLS_CIPHER_MODE_CFB)
NULL,
#endif
+#if defined(MBEDTLS_CIPHER_MODE_OFB)
+ NULL,
+#endif
#if defined(MBEDTLS_CIPHER_MODE_CTR)
NULL,
#endif
@@ -995,6 +1060,9 @@
#if defined(MBEDTLS_CIPHER_MODE_CFB)
NULL,
#endif
+#if defined(MBEDTLS_CIPHER_MODE_OFB)
+ NULL,
+#endif
#if defined(MBEDTLS_CIPHER_MODE_CTR)
NULL,
#endif
@@ -1040,6 +1108,9 @@
#if defined(MBEDTLS_CIPHER_MODE_CFB)
NULL,
#endif
+#if defined(MBEDTLS_CIPHER_MODE_OFB)
+ NULL,
+#endif
#if defined(MBEDTLS_CIPHER_MODE_CTR)
NULL,
#endif
@@ -1149,6 +1220,9 @@
#if defined(MBEDTLS_CIPHER_MODE_CFB)
blowfish_crypt_cfb64_wrap,
#endif
+#if defined(MBEDTLS_CIPHER_MODE_OFB)
+ NULL,
+#endif
#if defined(MBEDTLS_CIPHER_MODE_CTR)
blowfish_crypt_ctr_wrap,
#endif
@@ -1259,6 +1333,9 @@
#if defined(MBEDTLS_CIPHER_MODE_CFB)
NULL,
#endif
+#if defined(MBEDTLS_CIPHER_MODE_OFB)
+ NULL,
+#endif
#if defined(MBEDTLS_CIPHER_MODE_CTR)
NULL,
#endif
@@ -1362,6 +1439,11 @@
{ MBEDTLS_CIPHER_AES_192_CFB128, &aes_192_cfb128_info },
{ MBEDTLS_CIPHER_AES_256_CFB128, &aes_256_cfb128_info },
#endif
+#if defined(MBEDTLS_CIPHER_MODE_OFB)
+ { MBEDTLS_CIPHER_AES_128_OFB, &aes_128_ofb_info },
+ { MBEDTLS_CIPHER_AES_192_OFB, &aes_192_ofb_info },
+ { MBEDTLS_CIPHER_AES_256_OFB, &aes_256_ofb_info },
+#endif
#if defined(MBEDTLS_CIPHER_MODE_CTR)
{ MBEDTLS_CIPHER_AES_128_CTR, &aes_128_ctr_info },
{ MBEDTLS_CIPHER_AES_192_CTR, &aes_192_ctr_info },