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Declare cipher_auth_{en,de}crypt_ext()

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Work in progress: next steps are to implement and test it.

Compared to the existing non-ext version:

- to separate tag parameter
- explicit output_len parameter

Also, this version will retain support for NIST_KW (hence documents it), while
the non-ext version will lose it in a few commits.

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
This commit is contained in:
Manuel Pégourié-Gonnard 2020-11-25 12:57:47 +01:00
parent 3ba84d5bd6
commit 9cc079db7a
1 changed files with 108 additions and 0 deletions
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108
include/mbedtls/cipher.h
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@ -957,6 +957,114 @@ int mbedtls_cipher_auth_decrypt( mbedtls_cipher_context_t *ctx,
const unsigned char *tag, size_t tag_len );
#endif /* MBEDTLS_CIPHER_MODE_AEAD */
#if defined(MBEDTLS_CIPHER_MODE_AEAD) || defined(MBEDTLS_NIST_KW_C)
/**
* \brief The autenticated encryption (AEAD/NIST_KW) function.
*
* \note For AEAD modes, the tag will be appended to the
* ciphertext, as recommended by RFC 5116.
* (NIST_KW doesn't have a separate tag.)
*
* \param ctx The generic cipher context. This must be initialized and
* bound to a key.
* \param iv The nonce to use. This must be a readable buffer of
* at least \p iv_len Bytes and may be \c NULL if \p
* iv_len is \c 0.
* \param iv_len The length of the nonce. For AEAD ciphers, this must satisfy the
* constraints imposed by the cipher used. For NIST_KW,
* this must be \c 0.
* \param ad The additional data to authenticate. This must be a
* readable buffer of at least \p ad_len Bytes, and may
* be \c NULL is \p ad_len is \c 0.
* \param ad_len The length of \p ad. For NIST_KW, this must be \c 0.
* \param input The buffer holding the input data. This must be a
* readable buffer of at least \p ilen Bytes, and may be
* \c NULL if \p ilen is \c 0.
* \param ilen The length of the input data.
* \param output The buffer for the output data. This must be a
* writable buffer of at least \p output_len Bytes, and
* must not be \c NULL.
* \param output_len The length of the \p output buffer in Bytes. For AEAD
* ciphers, this must be at least \p ilen + \p tag_len.
* For NIST_KW, this must be at least \p ilen + 8
* (rounded up to a multiple of 8 if KWP is used);
* \p ilen + 15 is always a safe value.
* \param olen This will be filled with the actual number of Bytes
* written to the \p output buffer. This must point to a
* writable object of type \c size_t.
* \param tag_len The desired length of the authentication tag. For AEAD
* ciphers, this must match the constraints imposed by
* the cipher used, and in particuler must not be \c 0.
* For NIST_KW, this must be \c 0.
*
* \return \c 0 on success.
* \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on
* parameter-verification failure.
* \return A cipher-specific error code on failure.
*/
int mbedtls_cipher_auth_encrypt_ext( mbedtls_cipher_context_t *ctx,
const unsigned char *iv, size_t iv_len,
const unsigned char *ad, size_t ad_len,
const unsigned char *input, size_t ilen,
unsigned char *output, size_t output_len,
size_t *olen, size_t tag_len );
/**
* \brief The autenticated encryption (AEAD/NIST_KW) function.
*
* \note If the data is not authentic, then the output buffer
* is zeroed out to prevent the unauthentic plaintext being
* used, making this interface safer.
*
* \note For AEAD modes, the tag must be appended to the
* ciphertext, as recommended by RFC 5116.
* (NIST_KW doesn't have a separate tag.)
*
* \param ctx The generic cipher context. This must be initialized and
* and bound to a key.
* \param iv The nonce to use. This must be a readable buffer of
* at least \p iv_len Bytes and may be \c NULL if \p
* iv_len is \c 0.
* \param iv_len The length of the nonce. For AEAD ciphers, this must satisfy the
* constraints imposed by the cipher used. For NIST_KW,
* this must be \c 0.
* \param ad The additional data to authenticate. This must be a
* readable buffer of at least \p ad_len Bytes, and may
* be \c NULL is \p ad_len is \c 0.
* \param ad_len The length of \p ad. For NIST_KW, this must be \c 0.
* \param input The buffer holding the input data. This must be a
* readable buffer of at least \p ilen Bytes, and may be
* \c NULL if \p ilen is \c 0.
* \param ilen The length of the input data. For AEAD ciphers this
* must be at least \p tag_len. For NIST_KW this must be
* at least \c 8.
* \param output The buffer for the output data. This must be a
* writable buffer of at least \p output_len Bytes, and
* may be \c NULL if \p output_len is \c 0.
* \param output_len The length of the \p output buffer in Bytes. For AEAD
* ciphers, this must be at least \p ilen - \p tag_len.
* For NIST_KW, this must be at least \p ilen - 8.
* \param olen This will be filled with the actual number of Bytes
* written to the \p output buffer. This must point to a
* writable object of type \c size_t.
* \param tag_len The actual length of the authentication tag. For AEAD
* ciphers, this must match the constraints imposed by
* the cipher used, and in particuler must not be \c 0.
* For NIST_KW, this must be \c 0.
*
* \return \c 0 on success.
* \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on
* parameter-verification failure.
* \return #MBEDTLS_ERR_CIPHER_AUTH_FAILED if data is not authentic.
* \return A cipher-specific error code on failure.
*/
int mbedtls_cipher_auth_decrypt_ext( mbedtls_cipher_context_t *ctx,
const unsigned char *iv, size_t iv_len,
const unsigned char *ad, size_t ad_len,
const unsigned char *input, size_t ilen,
unsigned char *output, size_t output_len,
size_t *olen, size_t tag_len );
#endif /* MBEDTLS_CIPHER_MODE_AEAD || MBEDTLS_NIST_KW_C */
#ifdef __cplusplus
}
#endif