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Remove semi-internal chacha20_keystrem_block()

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It's actually easy to implement chachapoly without it, so let's not clutter
the API (and avoid adding a burden to alt implementers).
This commit is contained in:
Manuel Pégourié-Gonnard
2018-05-07 12:18:34 +02:00
parent 502f189253
commit 56206c4db1
3 changed files with 6 additions and 60 deletions
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37
library/chacha20.c
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@ -246,43 +246,6 @@ int mbedtls_chacha20_starts( mbedtls_chacha20_context* ctx,
return( 0 );
}
int mbedtls_chacha20_keystream_block( const mbedtls_chacha20_context *ctx,
uint32_t counter,
unsigned char keystream[64] )
{
uint32_t initial_state[16];
uint32_t working_state[16];
if ( ( ctx == NULL ) || ( keystream == NULL ) )
{
return( MBEDTLS_ERR_CHACHA20_BAD_INPUT_DATA );
}
initial_state[0] = ctx->initial_state[0];
initial_state[1] = ctx->initial_state[1];
initial_state[2] = ctx->initial_state[2];
initial_state[3] = ctx->initial_state[3];
initial_state[4] = ctx->initial_state[4];
initial_state[5] = ctx->initial_state[5];
initial_state[6] = ctx->initial_state[6];
initial_state[7] = ctx->initial_state[7];
initial_state[8] = ctx->initial_state[8];
initial_state[9] = ctx->initial_state[9];
initial_state[10] = ctx->initial_state[10];
initial_state[11] = ctx->initial_state[11];
initial_state[12] = counter;
initial_state[13] = ctx->initial_state[13];
initial_state[14] = ctx->initial_state[14];
initial_state[15] = ctx->initial_state[15];
mbedtls_chacha20_block( initial_state, working_state, keystream );
mbedtls_zeroize( initial_state, sizeof( initial_state ) );
mbedtls_zeroize( working_state, sizeof( working_state ) );
return( 0 );
}
int mbedtls_chacha20_update( mbedtls_chacha20_context *ctx,
size_t size,
const unsigned char *input,