diff options
Diffstat (limited to 'providers/implementations/ciphers/cipher_chacha20_poly1305.c')
| -rw-r--r-- | providers/implementations/ciphers/cipher_chacha20_poly1305.c | 314 |
1 files changed, 314 insertions, 0 deletions
diff --git a/providers/implementations/ciphers/cipher_chacha20_poly1305.c b/providers/implementations/ciphers/cipher_chacha20_poly1305.c new file mode 100644 index 0000000000..cc702cb8fc --- /dev/null +++ b/providers/implementations/ciphers/cipher_chacha20_poly1305.c @@ -0,0 +1,314 @@ +/* + * Copyright 2019 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the Apache License 2.0 (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html + */ + +/* Dispatch functions for chacha20_poly1305 cipher */ + +#include "cipher_chacha20_poly1305.h" +#include "prov/implementations.h" +#include "prov/providercommonerr.h" + + +#define CHACHA20_POLY1305_KEYLEN CHACHA_KEY_SIZE +#define CHACHA20_POLY1305_BLKLEN 1 +#define CHACHA20_POLY1305_MAX_IVLEN 12 +#define CHACHA20_POLY1305_MODE 0 +/* TODO(3.0) Figure out what flags are required */ +#define CHACHA20_POLY1305_FLAGS (EVP_CIPH_FLAG_AEAD_CIPHER \ + | EVP_CIPH_ALWAYS_CALL_INIT \ + | EVP_CIPH_CTRL_INIT \ + | EVP_CIPH_CUSTOM_COPY \ + | EVP_CIPH_FLAG_CUSTOM_CIPHER \ + | EVP_CIPH_CUSTOM_IV \ + | EVP_CIPH_CUSTOM_IV_LENGTH) + +static OSSL_OP_cipher_newctx_fn chacha20_poly1305_newctx; +static OSSL_OP_cipher_freectx_fn chacha20_poly1305_freectx; +static OSSL_OP_cipher_encrypt_init_fn chacha20_poly1305_einit; +static OSSL_OP_cipher_decrypt_init_fn chacha20_poly1305_dinit; +static OSSL_OP_cipher_get_params_fn chacha20_poly1305_get_params; +static OSSL_OP_cipher_get_ctx_params_fn chacha20_poly1305_get_ctx_params; +static OSSL_OP_cipher_set_ctx_params_fn chacha20_poly1305_set_ctx_params; +static OSSL_OP_cipher_cipher_fn chacha20_poly1305_cipher; +static OSSL_OP_cipher_final_fn chacha20_poly1305_final; +static OSSL_OP_cipher_gettable_ctx_params_fn chacha20_poly1305_gettable_ctx_params; +#define chacha20_poly1305_settable_ctx_params cipher_aead_settable_ctx_params +#define chacha20_poly1305_gettable_params cipher_generic_gettable_params +#define chacha20_poly1305_update chacha20_poly1305_cipher + +static void *chacha20_poly1305_newctx(void *provctx) +{ + PROV_CHACHA20_POLY1305_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx)); + + if (ctx != NULL) { + cipher_generic_initkey(&ctx->base, CHACHA20_POLY1305_KEYLEN * 8, + CHACHA20_POLY1305_BLKLEN * 8, + CHACHA20_POLY1305_IVLEN * 8, + CHACHA20_POLY1305_MODE, + CHACHA20_POLY1305_FLAGS, + PROV_CIPHER_HW_chacha20_poly1305( + CHACHA20_POLY1305_KEYLEN * 8), + NULL); + ctx->nonce_len = CHACHA20_POLY1305_IVLEN; + ctx->tls_payload_length = NO_TLS_PAYLOAD_LENGTH; + chacha20_initctx(&ctx->chacha); + } + return ctx; +} + +static void chacha20_poly1305_freectx(void *vctx) +{ + PROV_CHACHA20_POLY1305_CTX *ctx = (PROV_CHACHA20_POLY1305_CTX *)vctx; + + if (ctx != NULL) + OPENSSL_clear_free(ctx, sizeof(ctx)); +} + +static int chacha20_poly1305_get_params(OSSL_PARAM params[]) +{ + return cipher_generic_get_params(params, 0, CHACHA20_POLY1305_FLAGS, + CHACHA20_POLY1305_KEYLEN * 8, + CHACHA20_POLY1305_BLKLEN * 8, + CHACHA20_POLY1305_IVLEN * 8); +} + +static int chacha20_poly1305_get_ctx_params(void *vctx, OSSL_PARAM params[]) +{ + PROV_CHACHA20_POLY1305_CTX *ctx = (PROV_CHACHA20_POLY1305_CTX *)vctx; + OSSL_PARAM *p; + + p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_IVLEN); + if (p != NULL) { + if (!OSSL_PARAM_set_size_t(p, ctx->nonce_len)) { + ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER); + return 0; + } + } + p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_KEYLEN); + if (p != NULL && !OSSL_PARAM_set_size_t(p, CHACHA20_POLY1305_KEYLEN)) { + ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER); + return 0; + } + p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_AEAD_TAGLEN); + if (p != NULL && !OSSL_PARAM_set_size_t(p, ctx->tag_len)) { + ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER); + return 0; + } + p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_AEAD_TLS1_AAD_PAD); + if (p != NULL && !OSSL_PARAM_set_size_t(p, ctx->tls_aad_pad_sz)) { + ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER); + return 0; + } + + p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_AEAD_TAG); + if (p != NULL) { + if (p->data_type != OSSL_PARAM_OCTET_STRING) { + ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER); + return 0; + } + if (!ctx->base.enc) { + ERR_raise(ERR_LIB_PROV, PROV_R_TAG_NOTSET); + return 0; + } + if (p->data_size == 0 || p->data_size > POLY1305_BLOCK_SIZE) { + ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_TAGLEN); + return 0; + } + memcpy(p->data, ctx->tag, p->data_size); + } + + return 1; +} + +static const OSSL_PARAM chacha20_poly1305_known_gettable_ctx_params[] = { + OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_KEYLEN, NULL), + OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_IVLEN, NULL), + OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_AEAD_TAGLEN, NULL), + OSSL_PARAM_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG, NULL, 0), + OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD_PAD, NULL), + OSSL_PARAM_END +}; +static const OSSL_PARAM *chacha20_poly1305_gettable_ctx_params(void) +{ + return chacha20_poly1305_known_gettable_ctx_params; +} + +static int chacha20_poly1305_set_ctx_params(void *vctx, + const OSSL_PARAM params[]) +{ + const OSSL_PARAM *p; + size_t len; + PROV_CHACHA20_POLY1305_CTX *ctx = (PROV_CHACHA20_POLY1305_CTX *)vctx; + PROV_CIPHER_HW_CHACHA20_POLY1305 *hw = + (PROV_CIPHER_HW_CHACHA20_POLY1305 *)ctx->base.hw; + + p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_KEYLEN); + if (p != NULL) { + if (!OSSL_PARAM_get_size_t(p, &len)) { + ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER); + return 0; + } + if (len != CHACHA20_POLY1305_KEYLEN) { + ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH); + return 0; + } + } + p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_IVLEN); + if (p != NULL) { + if (!OSSL_PARAM_get_size_t(p, &len)) { + ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER); + return 0; + } + if (len == 0 || len > CHACHA20_POLY1305_MAX_IVLEN) { + ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH); + return 0; + } + ctx->nonce_len = len; + } + + p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_AEAD_TAG); + if (p != NULL) { + if (p->data_type != OSSL_PARAM_OCTET_STRING) { + ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER); + return 0; + } + if (p->data_size == 0 || p->data_size > POLY1305_BLOCK_SIZE) { + ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_TAGLEN); + return 0; + } + if (p->data != NULL) { + if (ctx->base.enc) { + ERR_raise(ERR_LIB_PROV, PROV_R_TAG_NOT_NEEDED); + return 0; + } + memcpy(ctx->tag, p->data, p->data_size); + } + ctx->tag_len = p->data_size; + } + + p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_AEAD_TLS1_AAD); + if (p != NULL) { + if (p->data_type != OSSL_PARAM_OCTET_STRING) { + ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER); + return 0; + } + len = hw->tls_init(&ctx->base, p->data, p->data_size); + if (len == 0) { + ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DATA); + return 0; + } + ctx->tls_aad_pad_sz = len; + } + + p = OSSL_PARAM_locate_const(params, OSSL_CIPHER_PARAM_AEAD_TLS1_IV_FIXED); + if (p != NULL) { + if (p->data_type != OSSL_PARAM_OCTET_STRING) { + ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER); + return 0; + } + if (hw->tls_iv_set_fixed(&ctx->base, p->data, p->data_size) == 0) { + ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IVLEN); + return 0; + } + } + /* ignore OSSL_CIPHER_PARAM_AEAD_MAC_KEY */ + return 1; +} + +static int chacha20_poly1305_einit(void *vctx, const unsigned char *key, + size_t keylen, const unsigned char *iv, + size_t ivlen) +{ + int ret; + + ret = cipher_generic_einit(vctx, key, keylen, iv, ivlen); + if (ret && iv != NULL) { + PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx; + PROV_CIPHER_HW_CHACHA20_POLY1305 *hw = + (PROV_CIPHER_HW_CHACHA20_POLY1305 *)ctx->hw; + + hw->initiv(ctx); + } + return ret; +} + +static int chacha20_poly1305_dinit(void *vctx, const unsigned char *key, + size_t keylen, const unsigned char *iv, + size_t ivlen) +{ + int ret; + + ret = cipher_generic_dinit(vctx, key, keylen, iv, ivlen); + if (ret && iv != NULL) { + PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx; + PROV_CIPHER_HW_CHACHA20_POLY1305 *hw = + (PROV_CIPHER_HW_CHACHA20_POLY1305 *)ctx->hw; + + hw->initiv(ctx); + } + return ret; +} + +static int chacha20_poly1305_cipher(void *vctx, unsigned char *out, + size_t *outl, size_t outsize, + const unsigned char *in, size_t inl) +{ + PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx; + PROV_CIPHER_HW_CHACHA20_POLY1305 *hw = + (PROV_CIPHER_HW_CHACHA20_POLY1305 *)ctx->hw; + + if (outsize < inl) { + ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL); + return 0; + } + + if (!hw->aead_cipher(ctx, out, outl, in, inl)) + return 0; + + *outl = inl; + return 1; +} + +static int chacha20_poly1305_final(void *vctx, unsigned char *out, size_t *outl, + size_t outsize) +{ + PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx; + PROV_CIPHER_HW_CHACHA20_POLY1305 *hw = + (PROV_CIPHER_HW_CHACHA20_POLY1305 *)ctx->hw; + + if (hw->aead_cipher(ctx, out, outl, NULL, 0) <= 0) + return 0; + + *outl = 0; + return 1; +} + +/* chacha20_poly1305_functions */ +const OSSL_DISPATCH chacha20_poly1305_functions[] = { + { OSSL_FUNC_CIPHER_NEWCTX, (void (*)(void))chacha20_poly1305_newctx }, + { OSSL_FUNC_CIPHER_FREECTX, (void (*)(void))chacha20_poly1305_freectx }, + { OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))chacha20_poly1305_einit }, + { OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))chacha20_poly1305_dinit }, + { OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))chacha20_poly1305_update }, + { OSSL_FUNC_CIPHER_FINAL, (void (*)(void))chacha20_poly1305_final }, + { OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))chacha20_poly1305_cipher }, + { OSSL_FUNC_CIPHER_GET_PARAMS, + (void (*)(void))chacha20_poly1305_get_params }, + { OSSL_FUNC_CIPHER_GETTABLE_PARAMS, + (void (*)(void))chacha20_poly1305_gettable_params }, + { OSSL_FUNC_CIPHER_GET_CTX_PARAMS, + (void (*)(void))chacha20_poly1305_get_ctx_params }, + { OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS, + (void (*)(void))chacha20_poly1305_gettable_ctx_params }, + { OSSL_FUNC_CIPHER_SET_CTX_PARAMS, + (void (*)(void))chacha20_poly1305_set_ctx_params }, + { OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS, + (void (*)(void))chacha20_poly1305_settable_ctx_params }, + { 0, NULL } +}; + |