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Clarify use of blinding in RSA private key operations

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Hanno Becker 2017-11-06 15:06:25 +00:00
parent 41a38dfed6
commit 9d5785be8f
1 changed files with 13 additions and 1 deletions
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14
include/mbedtls/rsa.h
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@ -220,7 +220,7 @@ int mbedtls_rsa_public( mbedtls_rsa_context *ctx,
* \brief Do an RSA private key operation
*
* \param ctx RSA context
* \param f_rng RNG function (Needed for blinding)
* \param f_rng RNG function (used for blinding)
* \param p_rng RNG parameter
* \param input input buffer
* \param output output buffer
@ -229,6 +229,18 @@ int mbedtls_rsa_public( mbedtls_rsa_context *ctx,
*
* \note The input and output buffers must be large
* enough (eg. 128 bytes if RSA-1024 is used).
*
* \note Blinding is used if and only if a PRNG is provided.
*
* \note If blinding is used, both the base of exponentation
* and the exponent are blinded, providing protection
* against some side-channel attacks.
*
* \warning It is deprecated and a security risk to not provide
* a PRNG here and thereby prevent the use of blinding.
* Future versions of the library may enforce the presence
* of a PRNG.
*
*/
int mbedtls_rsa_private( mbedtls_rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),