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chacha20: fix bug in starts() and add test for it

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Previously the streaming API would fail when encrypting multiple messages with
the same key.
This commit is contained in:
Manuel Pégourié-Gonnard
2018-05-09 12:37:58 +02:00
parent 7296771194
commit 55c0d096b7
2 changed files with 42 additions and 1 deletions
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6
library/chacha20.c
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@ -243,6 +243,12 @@ int mbedtls_chacha20_starts( mbedtls_chacha20_context* ctx,
ctx->initial_state[14] = BYTES_TO_U32_LE( nonce, 4 );
ctx->initial_state[15] = BYTES_TO_U32_LE( nonce, 8 );
mbedtls_zeroize( ctx->working_state, sizeof( ctx->working_state ) );
mbedtls_zeroize( ctx->keystream8, sizeof( ctx->keystream8 ) );
/* Initially, there's no keystream bytes available */
ctx->keystream_bytes_used = CHACHA20_BLOCK_SIZE_BYTES;
return( 0 );
}