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Implement AES-XTS mode

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XTS mode is fully known as "xor-encrypt-xor with ciphertext-stealing".
This is the generalization of the XEX mode.
This implementation is limited to an 8-bits (1 byte) boundary, which
doesn't seem to be what was thought considering some test vectors [1].

This commit comes with tests, extracted from [1], and benchmarks.
Although, benchmarks aren't really nice here, as they work with a buffer
of a multiple of 16 bytes, which isn't a challenge for XTS compared to
XEX.

[1] http://csrc.nist.gov/groups/STM/cavp/documents/aes/XTSTestVectors.zip
This commit is contained in:
Aorimn 2016-06-09 23:22:58 +02:00 • committed by Jaeden Amero
parent 380162c34c
commit 5f77801ac3
8 changed files with 4483 additions and 5 deletions
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3
library/version_features.c
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@ -252,6 +252,9 @@ static const char *features[] = {
#if defined(MBEDTLS_CIPHER_MODE_XEX)
"MBEDTLS_CIPHER_MODE_XEX",
#endif /* MBEDTLS_CIPHER_MODE_XEX */
#if defined(MBEDTLS_CIPHER_MODE_XTS)
"MBEDTLS_CIPHER_MODE_XTS",
#endif /* MBEDTLS_CIPHER_MODE_XTS */
#if defined(MBEDTLS_CIPHER_MODE_OFB)
"MBEDTLS_CIPHER_MODE_OFB",
#endif /* MBEDTLS_CIPHER_MODE_OFB */