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olen parameter shall contain the length of the buffer.

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For SHA-3 families, it must be at least 28, 32, 48 or 64, depending on the family.

Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
This commit is contained in:
Pol Henarejos 2022-05-17 12:53:30 +02:00
parent e6b8c83c7a
commit 1f3ae1639d
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GPG key ID: C0095B7870A4CCD3
2 changed files with 13 additions and 7 deletions
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11
include/mbedtls/sha3.h
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@ -145,9 +145,9 @@ int mbedtls_sha3_update( mbedtls_sha3_context *ctx,
* and have a hash operation started.
* \param output The SHA-3 checksum result.
* This must be a writable buffer of length \c olen bytes.
* \param olen Defines a variable output length (in bytes). \c output must be
* \c olen bytes length. For SHA-3 224, SHA-3 256, SHA-3 384 and
* SHA-3 512 must equal to 28, 32, 48 and 64, respectively.
* \param olen Defines the length of output buffer (in bytes). For SHA-3 224, SHA-3 256,
* SHA-3 384 and SHA-3 512 \c olen must equal to 28, 32, 48 and 64,
* respectively.
*
* \return \c 0 on success.
* \return A negative error code on failure.
@ -171,8 +171,9 @@ int mbedtls_sha3_finish( mbedtls_sha3_context *ctx,
* \param ilen The length of the input data in Bytes.
* \param output The SHA-3 checksum result.
* This must be a writable buffer of length \c olen bytes.
* \param olen Determines the length (in bytes) of the output. \c output
* must be \c olen bytes length.
* \param olen Defines the length of output buffer (in bytes). For SHA-3 224, SHA-3 256,
* SHA-3 384 and SHA-3 512 \c olen must equal to 28, 32, 48 and 64,
* respectively.
*
* \return \c 0 on success.
* \return A negative error code on failure.

9
library/sha3.c
View file

@ -244,8 +244,13 @@ int mbedtls_sha3_finish( mbedtls_sha3_context *ctx,
if( ctx == NULL || output == NULL )
return( MBEDTLS_ERR_SHA3_BAD_INPUT_DATA );
if( ctx->olen > 0 && ctx->olen != olen )
return( MBEDTLS_ERR_SHA3_BAD_INPUT_DATA );
/* Catch SHA-3 families, with fixed output length */
if( ctx->olen > 0 )
{
if ( ctx->olen > olen )
return( MBEDTLS_ERR_SHA3_BAD_INPUT_DATA );
olen = ctx->olen;
}
ABSORB( ctx, ctx->index, ctx->xor_byte );
ABSORB( ctx, ctx->max_block_size - 1, 0x80 );