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Improve documentation of PKCS1 decryption functions

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Document the preconditions on the input and output buffers for
the PKCS1 decryption functions
 - mbedtls_rsa_pkcs1_decrypt,
 - mbedtls_rsa_rsaes_pkcs1_v15_decrypt
  - mbedtls_rsa_rsaes_oaep_decrypt
This commit is contained in:
Simon Butcher 2017-07-19 01:58:47 +01:00
parent 8a2855ee3c
commit 573bb96416
1 changed files with 27 additions and 9 deletions
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36
include/polarssl/rsa.h
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@ -336,9 +336,15 @@ int rsa_rsaes_oaep_encrypt( rsa_context *ctx,
* *
* \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code * \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code
* *
* \note The output buffer must be as large as the size * \note The output buffer length \c output_max_len should be
* of ctx->N (eg. 128 bytes if RSA-1024 is used) otherwise * as large as the size ctx->len of ctx->N (eg. 128 bytes
* an error is thrown. * if RSA-1024 is used) to be able to hold an arbitrary
* decrypted message. If it is not large enough to hold
* the decryption of the particular ciphertext provided,
* the function will return POLARSSL_ERR_RSA_OUTPUT_TOO_LARGE.
*
* \note The input buffer must be as large as the size
* of ctx->N (eg. 128 bytes if RSA-1024 is used).
*/ */
int rsa_pkcs1_decrypt( rsa_context *ctx, int rsa_pkcs1_decrypt( rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t), int (*f_rng)(void *, unsigned char *, size_t),
@ -363,9 +369,15 @@ int rsa_pkcs1_decrypt( rsa_context *ctx,
* *
* \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code * \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code
* *
* \note The output buffer must be as large as the size * \note The output buffer length \c output_max_len should be
* of ctx->N (eg. 128 bytes if RSA-1024 is used) otherwise * as large as the size ctx->len of ctx->N (eg. 128 bytes
* an error is thrown. * if RSA-1024 is used) to be able to hold an arbitrary
* decrypted message. If it is not large enough to hold
* the decryption of the particular ciphertext provided,
* the function will return POLARSSL_ERR_RSA_OUTPUT_TOO_LARGE.
*
* \note The input buffer must be as large as the size
* of ctx->N (eg. 128 bytes if RSA-1024 is used).
*/ */
int rsa_rsaes_pkcs1_v15_decrypt( rsa_context *ctx, int rsa_rsaes_pkcs1_v15_decrypt( rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t), int (*f_rng)(void *, unsigned char *, size_t),
@ -392,9 +404,15 @@ int rsa_rsaes_pkcs1_v15_decrypt( rsa_context *ctx,
* *
* \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code * \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code
* *
* \note The output buffer must be as large as the size * \note The output buffer length \c output_max_len should be
* of ctx->N (eg. 128 bytes if RSA-1024 is used) otherwise * as large as the size ctx->len of ctx->N (eg. 128 bytes
* an error is thrown. * if RSA-1024 is used) to be able to hold an arbitrary
* decrypted message. If it is not large enough to hold
* the decryption of the particular ciphertext provided,
* the function will return POLARSSL_ERR_RSA_OUTPUT_TOO_LARGE.
*
* \note The input buffer must be as large as the size
* of ctx->N (eg. 128 bytes if RSA-1024 is used).
*/ */
int rsa_rsaes_oaep_decrypt( rsa_context *ctx, int rsa_rsaes_oaep_decrypt( rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t), int (*f_rng)(void *, unsigned char *, size_t),