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Improve documentation on the use of blinding in RSA

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Hanno Becker 2018-03-09 10:47:30 +00:00
parent e856e84de3
commit 26f1f6061d
1 changed files with 12 additions and 0 deletions
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12
include/mbedtls/rsa.h
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@ -518,6 +518,18 @@ int mbedtls_rsa_public( mbedtls_rsa_context *ctx,
* *
* \note The input and output buffers must be large * \note The input and output buffers must be large
* enough. For example, 128 Bytes if RSA-1024 is used. * enough. For example, 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 mbedtls_rsa_private( mbedtls_rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t), int (*f_rng)(void *, unsigned char *, size_t),