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/* $OpenBSD: e_chacha.c,v 1.5 2014/08/04 04:16:11 miod Exp $ */ |
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/* |
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* Copyright (c) 2014 Joel Sing <jsing@openbsd.org> |
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* |
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* Permission to use, copy, modify, and distribute this software for any |
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* purpose with or without fee is hereby granted, provided that the above |
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* copyright notice and this permission notice appear in all copies. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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#include <openssl/opensslconf.h> |
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#ifndef OPENSSL_NO_CHACHA |
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#include <openssl/chacha.h> |
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#include <openssl/evp.h> |
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#include <openssl/objects.h> |
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#include "evp_locl.h" |
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static int chacha_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, |
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const unsigned char *in, size_t len); |
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static int chacha_init(EVP_CIPHER_CTX *ctx, const unsigned char *key, |
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const unsigned char *iv, int enc); |
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static const EVP_CIPHER chacha20_cipher = { |
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.nid = NID_chacha20, |
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.block_size = 1, |
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.key_len = 32, |
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.iv_len = 8, |
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.flags = EVP_CIPH_STREAM_CIPHER, |
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.init = chacha_init, |
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.do_cipher = chacha_cipher, |
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.ctx_size = sizeof(ChaCha_ctx) |
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}; |
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const EVP_CIPHER * |
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EVP_chacha20(void) |
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{ |
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return (&chacha20_cipher); |
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} |
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static int |
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chacha_init(EVP_CIPHER_CTX *ctx, const unsigned char *key, |
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const unsigned char *iv, int enc) |
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{ |
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ChaCha_set_key((ChaCha_ctx *)ctx->cipher_data, key, |
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EVP_CIPHER_CTX_key_length(ctx) * 8); |
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✓✗ |
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if (iv != NULL) |
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ChaCha_set_iv((ChaCha_ctx *)ctx->cipher_data, iv, NULL); |
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return 1; |
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} |
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static int |
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chacha_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, |
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size_t len) |
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{ |
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ChaCha((ChaCha_ctx *)ctx->cipher_data, out, in, len); |
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return 1; |
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} |
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#endif |