diff options
Diffstat (limited to 'include/mbedtls/cipher.h')
| -rw-r--r-- | include/mbedtls/cipher.h | 222 |
1 files changed, 186 insertions, 36 deletions
diff --git a/include/mbedtls/cipher.h b/include/mbedtls/cipher.h index 8827e0b..1cafa6e 100644 --- a/include/mbedtls/cipher.h +++ b/include/mbedtls/cipher.h @@ -857,30 +857,52 @@ int mbedtls_cipher_crypt( mbedtls_cipher_context_t *ctx, unsigned char *output, size_t *olen ); #if defined(MBEDTLS_CIPHER_MODE_AEAD) +#if ! defined(MBEDTLS_DEPRECATED_REMOVED) +#if defined(MBEDTLS_DEPRECATED_WARNING) +#define MBEDTLS_DEPRECATED __attribute__((deprecated)) +#else +#define MBEDTLS_DEPRECATED +#endif /* MBEDTLS_DEPRECATED_WARNING */ /** - * \brief The generic autenticated encryption (AEAD) function. + * \brief The generic authenticated encryption (AEAD) function. + * + * \deprecated Superseded by mbedtls_cipher_auth_encrypt_ext(). + * + * \note This function only supports AEAD algorithms, not key + * wrapping algorithms such as NIST_KW; for this, see + * mbedtls_cipher_auth_encrypt_ext(). * * \param ctx The generic cipher context. This must be initialized and - * bound to a key. - * \param iv The IV to use, or NONCE_COUNTER for CTR-mode ciphers. - * This must be a readable buffer of at least \p iv_len - * Bytes. - * \param iv_len The IV length for ciphers with variable-size IV. - * This parameter is discarded by ciphers with fixed-size IV. + * bound to a key associated with an AEAD algorithm. + * \param iv The nonce to use. This must be a readable buffer of + * at least \p iv_len Bytes and must not be \c NULL. + * \param iv_len The length of the nonce. This must satisfy the + * constraints imposed by the AEAD cipher used. * \param ad The additional data to authenticate. This must be a - * readable buffer of at least \p ad_len Bytes. + * 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. * \param input The buffer holding the input data. This must be a - * readable buffer of at least \p ilen Bytes. + * 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 able to - * hold at least \p ilen Bytes. - * \param olen The length of the output data, to be updated with the - * actual number of Bytes written. This must not be - * \c NULL. + * \param output The buffer for the output data. This must be a + * writable buffer of at least \p ilen Bytes, and must + * not be \c NULL. + * \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 The buffer for the authentication tag. This must be a - * writable buffer of at least \p tag_len Bytes. - * \param tag_len The desired length of the authentication tag. + * writable buffer of at least \p tag_len Bytes. See note + * below regarding restrictions with PSA-based contexts. + * \param tag_len The desired length of the authentication tag. This + * must match the constraints imposed by the AEAD cipher + * used, and in particular must not be \c 0. + * + * \note If the context is based on PSA (that is, it was set up + * with mbedtls_cipher_setup_psa()), then it is required + * that \c tag == output + ilen. That is, the tag must be + * appended to the ciphertext as recommended by RFC 5116. * * \return \c 0 on success. * \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on @@ -892,36 +914,53 @@ int mbedtls_cipher_auth_encrypt( mbedtls_cipher_context_t *ctx, const unsigned char *ad, size_t ad_len, const unsigned char *input, size_t ilen, unsigned char *output, size_t *olen, - unsigned char *tag, size_t tag_len ); + unsigned char *tag, size_t tag_len ) + MBEDTLS_DEPRECATED; /** - * \brief The generic autenticated decryption (AEAD) function. + * \brief The generic authenticated decryption (AEAD) function. + * + * \deprecated Superseded by mbedtls_cipher_auth_decrypt_ext(). + * + * \note This function only supports AEAD algorithms, not key + * wrapping algorithms such as NIST_KW; for this, see + * mbedtls_cipher_auth_decrypt_ext(). * * \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. * * \param ctx The generic cipher context. This must be initialized and - * and bound to a key. - * \param iv The IV to use, or NONCE_COUNTER for CTR-mode ciphers. - * This must be a readable buffer of at least \p iv_len - * Bytes. - * \param iv_len The IV length for ciphers with variable-size IV. - * This parameter is discarded by ciphers with fixed-size IV. - * \param ad The additional data to be authenticated. This must be a - * readable buffer of at least \p ad_len Bytes. + * bound to a key associated with an AEAD algorithm. + * \param iv The nonce to use. This must be a readable buffer of + * at least \p iv_len Bytes and must not be \c NULL. + * \param iv_len The length of the nonce. This must satisfy the + * constraints imposed by the AEAD cipher used. + * \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. * \param input The buffer holding the input data. This must be a - * readable buffer of at least \p ilen Bytes. + * 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 able to hold at least \p ilen Bytes. - * \param olen The length of the output data, to be updated with the - * actual number of Bytes written. This must not be - * \c NULL. - * \param tag The buffer holding the authentication tag. This must be - * a readable buffer of at least \p tag_len Bytes. - * \param tag_len The length of the authentication tag. + * \param output The buffer for the output data. This must be a + * writable buffer of at least \p ilen Bytes, and must + * not be \c NULL. + * \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 The buffer for the authentication tag. This must be a + * readable buffer of at least \p tag_len Bytes. See note + * below regarding restrictions with PSA-based contexts. + * \param tag_len The length of the authentication tag. This must match + * the constraints imposed by the AEAD cipher used, and in + * particular must not be \c 0. + * + * \note If the context is based on PSA (that is, it was set up + * with mbedtls_cipher_setup_psa()), then it is required + * that \c tag == input + len. That is, the tag must be + * appended to the ciphertext as recommended by RFC 5116. * * \return \c 0 on success. * \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on @@ -934,9 +973,120 @@ int mbedtls_cipher_auth_decrypt( mbedtls_cipher_context_t *ctx, const unsigned char *ad, size_t ad_len, const unsigned char *input, size_t ilen, unsigned char *output, size_t *olen, - const unsigned char *tag, size_t tag_len ); + const unsigned char *tag, size_t tag_len ) + MBEDTLS_DEPRECATED; +#undef MBEDTLS_DEPRECATED +#endif /* MBEDTLS_DEPRECATED_REMOVED */ #endif /* MBEDTLS_CIPHER_MODE_AEAD */ +#if defined(MBEDTLS_CIPHER_MODE_AEAD) || defined(MBEDTLS_NIST_KW_C) +/** + * \brief The authenticated 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, with an AEAD algorithm or NIST_KW. + * \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 particular 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 authenticated 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 + * bound to a key, with an AEAD algorithm or NIST_KW. + * \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 particular 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 |