/src/openssl/providers/implementations/ciphers/cipher_chacha20_poly1305.c

Source
/*
 * Copyright 2019-2026 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 <string.h>
#include <openssl/proverr.h>
#include "cipher_chacha20_poly1305.h"
#include "prov/implementations.h"
#include "prov/providercommon.h"
#include "providers/implementations/ciphers/cipher_chacha20_poly1305.inc"

#define CHACHA20_POLY1305_KEYLEN CHACHA_KEY_SIZE
#define CHACHA20_POLY1305_BLKLEN 1
#define CHACHA20_POLY1305_MAX_IVLEN 12
#define CHACHA20_POLY1305_MODE 0
#define CHACHA20_POLY1305_FLAGS (PROV_CIPHER_FLAG_AEAD \
    | PROV_CIPHER_FLAG_CUSTOM_IV)

static OSSL_FUNC_cipher_newctx_fn chacha20_poly1305_newctx;
static OSSL_FUNC_cipher_freectx_fn chacha20_poly1305_freectx;
static OSSL_FUNC_cipher_dupctx_fn chacha20_poly1305_dupctx;
static OSSL_FUNC_cipher_encrypt_init_fn chacha20_poly1305_einit;
static OSSL_FUNC_cipher_decrypt_init_fn chacha20_poly1305_dinit;
static OSSL_FUNC_cipher_get_params_fn chacha20_poly1305_get_params;
static OSSL_FUNC_cipher_get_ctx_params_fn chacha20_poly1305_get_ctx_params;
static OSSL_FUNC_cipher_set_ctx_params_fn chacha20_poly1305_set_ctx_params;
static OSSL_FUNC_cipher_cipher_fn chacha20_poly1305_cipher;
static OSSL_FUNC_cipher_final_fn chacha20_poly1305_final;
static OSSL_FUNC_cipher_gettable_ctx_params_fn chacha20_poly1305_gettable_ctx_params;
static OSSL_FUNC_cipher_settable_ctx_params_fn chacha20_poly1305_settable_ctx_params;
#define chacha20_poly1305_gettable_params ossl_cipher_generic_gettable_params

static void *chacha20_poly1305_newctx(void *provctx)
{
    PROV_CHACHA20_POLY1305_CTX *ctx;

    if (!ossl_prov_is_running())
        return NULL;

    ctx = OPENSSL_zalloc(sizeof(*ctx));
    if (ctx != NULL) {
        ossl_cipher_generic_initkey(&ctx->base, CHACHA20_POLY1305_KEYLEN * 8,
            CHACHA20_POLY1305_BLKLEN * 8,
            CHACHA20_POLY1305_IVLEN * 8,
            CHACHA20_POLY1305_MODE,
            CHACHA20_POLY1305_FLAGS,
            ossl_prov_cipher_hw_chacha20_poly1305(
                CHACHA20_POLY1305_KEYLEN * 8),
            NULL);
        ctx->tls_payload_length = NO_TLS_PAYLOAD_LENGTH;
        ossl_chacha20_initctx(&ctx->chacha);
    }
    return ctx;
}

static void *chacha20_poly1305_dupctx(void *provctx)
{
    PROV_CHACHA20_POLY1305_CTX *ctx = provctx;
    PROV_CHACHA20_POLY1305_CTX *dctx = NULL;

    if (ctx == NULL)
        return NULL;
    dctx = OPENSSL_memdup(ctx, sizeof(*ctx));
    if (dctx != NULL
        && !ossl_cipher_generic_dupctx_tlsmac(&dctx->base, &ctx->base)) {
        OPENSSL_clear_free(dctx, sizeof(*dctx));
        return NULL;
    }
    return dctx;
}

static void chacha20_poly1305_freectx(void *vctx)
{
    PROV_CHACHA20_POLY1305_CTX *ctx = (PROV_CHACHA20_POLY1305_CTX *)vctx;

    if (ctx != NULL) {
        ossl_cipher_generic_reset_ctx((PROV_CIPHER_CTX *)vctx);
        OPENSSL_clear_free(ctx, sizeof(*ctx));
    }
}

static int chacha20_poly1305_get_params(OSSL_PARAM params[])
{
    return ossl_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;
    struct chacha20_poly1305_get_ctx_params_st p;

    if (ctx == NULL || !chacha20_poly1305_get_ctx_params_decoder(params, &p))
        return 0;

    if (p.ivlen != NULL
        && !OSSL_PARAM_set_size_t(p.ivlen, CHACHA20_POLY1305_IVLEN)) {
        ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
        return 0;
    }

    if (p.keylen != NULL
        && !OSSL_PARAM_set_size_t(p.keylen, CHACHA20_POLY1305_KEYLEN)) {
        ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
        return 0;
    }

    /* tag_len == 0 means no tag set yet, report the default */
    if (p.taglen != NULL
        && !OSSL_PARAM_set_size_t(p.taglen,
            ctx->tag_len == 0 ? POLY1305_BLOCK_SIZE : ctx->tag_len)) {
        ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
        return 0;
    }

    if (p.pad != NULL
        && !OSSL_PARAM_set_size_t(p.pad, ctx->tls_aad_pad_sz)) {
        ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
        return 0;
    }

    if (p.tag != NULL) {
        if (p.tag->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_NOT_SET);
            return 0;
        }
        if (p.tag->data_size == 0 || p.tag->data_size > POLY1305_BLOCK_SIZE) {
            ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_TAG_LENGTH);
            return 0;
        }
        memcpy(p.tag->data, ctx->tag, p.tag->data_size);
    }
    return 1;
}

static const OSSL_PARAM *chacha20_poly1305_gettable_ctx_params(ossl_unused void *cctx, ossl_unused void *provctx)
{
    return chacha20_poly1305_get_ctx_params_list;
}

static const OSSL_PARAM *chacha20_poly1305_settable_ctx_params(
    ossl_unused void *cctx, ossl_unused void *provctx)
{
    return chacha20_poly1305_set_ctx_params_list;
}

static int chacha20_poly1305_set_ctx_params(void *vctx,
    const OSSL_PARAM params[])
{
    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;
    struct chacha20_poly1305_set_ctx_params_st p;

    if (!chacha20_poly1305_set_ctx_params_decoder(params, &p))
        return 0;

    if (p.keylen != NULL) {
        if (!OSSL_PARAM_get_size_t(p.keylen, &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;
        }
    }

    if (p.ivlen != NULL) {
        if (!OSSL_PARAM_get_size_t(p.ivlen, &len)) {
            ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
            return 0;
        }
        if (len != CHACHA20_POLY1305_MAX_IVLEN) {
            ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH);
            return 0;
        }
        ctx->iv_state = IV_STATE_UNINITIALISED;
    }

    if (p.tag != NULL) {
        if (p.tag->data_type != OSSL_PARAM_OCTET_STRING) {
            ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
            return 0;
        }
        if (p.tag->data_size == 0 || p.tag->data_size > POLY1305_BLOCK_SIZE) {
            ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_TAG_LENGTH);
            return 0;
        }
        if (p.tag->data != NULL) {
            if (ctx->base.enc) {
                ERR_raise(ERR_LIB_PROV, PROV_R_TAG_NOT_NEEDED);
                return 0;
            }
            memcpy(ctx->tag, p.tag->data, p.tag->data_size);
        }
        ctx->tag_len = p.tag->data_size;
    }

    if (p.aad != NULL) {
        if (p.aad->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.aad->data, p.aad->data_size);
        if (len == 0) {
            ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DATA);
            return 0;
        }
        ctx->tls_aad_pad_sz = len;
    }

    if (p.fixed != NULL) {
        if (p.fixed->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.fixed->data,
                p.fixed->data_size)
            == 0) {
            ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH);
            return 0;
        }
    }
    return 1;
}

static int chacha20_poly1305_einit(void *vctx, const unsigned char *key,
    size_t keylen, const unsigned char *iv,
    size_t ivlen, const OSSL_PARAM params[])
{
    int ret;

    /* The generic function checks for ossl_prov_is_running() */
    ret = ossl_cipher_generic_einit(vctx, key, keylen, iv, ivlen, NULL);
    if (ret && iv != NULL) {
        PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
        PROV_CHACHA20_POLY1305_CTX *cctx = (PROV_CHACHA20_POLY1305_CTX *)vctx;
        PROV_CIPHER_HW_CHACHA20_POLY1305 *hw = (PROV_CIPHER_HW_CHACHA20_POLY1305 *)ctx->hw;

        hw->initiv(ctx);
        cctx->iv_state = IV_STATE_BUFFERED;
    }
    if (ret && !chacha20_poly1305_set_ctx_params(vctx, params))
        ret = 0;
    return ret;
}

static int chacha20_poly1305_dinit(void *vctx, const unsigned char *key,
    size_t keylen, const unsigned char *iv,
    size_t ivlen, const OSSL_PARAM params[])
{
    int ret;

    /* The generic function checks for ossl_prov_is_running() */
    ret = ossl_cipher_generic_dinit(vctx, key, keylen, iv, ivlen, NULL);
    if (ret && iv != NULL) {
        PROV_CIPHER_CTX *ctx = (PROV_CIPHER_CTX *)vctx;
        PROV_CHACHA20_POLY1305_CTX *cctx = (PROV_CHACHA20_POLY1305_CTX *)vctx;
        PROV_CIPHER_HW_CHACHA20_POLY1305 *hw = (PROV_CIPHER_HW_CHACHA20_POLY1305 *)ctx->hw;

        hw->initiv(ctx);
        cctx->iv_state = IV_STATE_BUFFERED;
    }
    if (ret && !chacha20_poly1305_set_ctx_params(vctx, params))
        ret = 0;
    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 (!ossl_prov_is_running())
        return 0;

    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;

    return 1;
}

static int chacha20_poly1305_update(void *vctx, unsigned char *out,
    size_t *outl, size_t outsize,
    const unsigned char *in, size_t inl)
{
    PROV_CHACHA20_POLY1305_CTX *ctx = (PROV_CHACHA20_POLY1305_CTX *)vctx;

    if (ctx->iv_state == IV_STATE_FINISHED)
        return 0;

    /*
     * a zero-length update is a nop, ALWAYS SUCCEED via early exit
     * NB: ONLY EVP_Cipher() / final produce or check the tag
     */
    if (inl == 0) {
        *outl = 0;
        return 1;
    }

    return chacha20_poly1305_cipher(vctx, out, outl, outsize, in, inl);
}

static int chacha20_poly1305_final(void *vctx, unsigned char *out, size_t *outl,
    size_t outsize)
{
    PROV_CHACHA20_POLY1305_CTX *ctx = (PROV_CHACHA20_POLY1305_CTX *)vctx;
    PROV_CIPHER_HW_CHACHA20_POLY1305 *hw = (PROV_CIPHER_HW_CHACHA20_POLY1305 *)ctx->base.hw;

    if (!ossl_prov_is_running())
        return 0;

    /* The tag must be set before actually decrypting data */
    if (!ctx->base.enc && ctx->tag_len == 0) {
        ERR_raise(ERR_LIB_PROV, PROV_R_TAG_NOT_SET);
        return 0;
    }

    if (hw->aead_cipher((PROV_CIPHER_CTX *)ctx, out, outl, NULL, 0) <= 0)
        return 0;

    *outl = 0;

    /* Don't reuse the IV */
    ctx->iv_state = IV_STATE_FINISHED;
    return 1;
}

/* ossl_chacha20_ossl_poly1305_functions */
const OSSL_DISPATCH ossl_chacha20_ossl_poly1305_functions[] = {
    { OSSL_FUNC_CIPHER_NEWCTX, (void (*)(void))chacha20_poly1305_newctx },
    { OSSL_FUNC_CIPHER_FREECTX, (void (*)(void))chacha20_poly1305_freectx },
    { OSSL_FUNC_CIPHER_DUPCTX, (void (*)(void))chacha20_poly1305_dupctx },
    { 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 },
    OSSL_DISPATCH_END
};

Coverage Report

Created: 2026-10-16 07:07

Line	Count	Source
1		/*
2		* Copyright 2019-2026 The OpenSSL Project Authors. All Rights Reserved.
3		*
4		* Licensed under the Apache License 2.0 (the "License"). You may not use
5		* this file except in compliance with the License. You can obtain a copy
6		* in the file LICENSE in the source distribution or at
7		* https://www.openssl.org/source/license.html
8		*/
9
10		/* Dispatch functions for chacha20_poly1305 cipher */
11
12		#include <string.h>
13		#include <openssl/proverr.h>
14		#include "cipher_chacha20_poly1305.h"
15		#include "prov/implementations.h"
16		#include "prov/providercommon.h"
17		#include "providers/implementations/ciphers/cipher_chacha20_poly1305.inc"
18
19	1	#define CHACHA20_POLY1305_KEYLEN CHACHA_KEY_SIZE
20	1	#define CHACHA20_POLY1305_BLKLEN 1
21	0	#define CHACHA20_POLY1305_MAX_IVLEN 12
22	0	#define CHACHA20_POLY1305_MODE 0
23	1	#define CHACHA20_POLY1305_FLAGS (PROV_CIPHER_FLAG_AEAD \
24	1	\| PROV_CIPHER_FLAG_CUSTOM_IV)
25
26		static OSSL_FUNC_cipher_newctx_fn chacha20_poly1305_newctx;
27		static OSSL_FUNC_cipher_freectx_fn chacha20_poly1305_freectx;
28		static OSSL_FUNC_cipher_dupctx_fn chacha20_poly1305_dupctx;
29		static OSSL_FUNC_cipher_encrypt_init_fn chacha20_poly1305_einit;
30		static OSSL_FUNC_cipher_decrypt_init_fn chacha20_poly1305_dinit;
31		static OSSL_FUNC_cipher_get_params_fn chacha20_poly1305_get_params;
32		static OSSL_FUNC_cipher_get_ctx_params_fn chacha20_poly1305_get_ctx_params;
33		static OSSL_FUNC_cipher_set_ctx_params_fn chacha20_poly1305_set_ctx_params;
34		static OSSL_FUNC_cipher_cipher_fn chacha20_poly1305_cipher;
35		static OSSL_FUNC_cipher_final_fn chacha20_poly1305_final;
36		static OSSL_FUNC_cipher_gettable_ctx_params_fn chacha20_poly1305_gettable_ctx_params;
37		static OSSL_FUNC_cipher_settable_ctx_params_fn chacha20_poly1305_settable_ctx_params;
38		#define chacha20_poly1305_gettable_params ossl_cipher_generic_gettable_params
39
40		static void chacha20_poly1305_newctx(void provctx)
41	0	{
42	0	PROV_CHACHA20_POLY1305_CTX *ctx;
43
44	0	if (!ossl_prov_is_running())
45	0	return NULL;
46
47	0	ctx = OPENSSL_zalloc(sizeof(*ctx));
48	0	if (ctx != NULL) {
49	0	ossl_cipher_generic_initkey(&ctx->base, CHACHA20_POLY1305_KEYLEN * 8,
50	0	CHACHA20_POLY1305_BLKLEN * 8,
51	0	CHACHA20_POLY1305_IVLEN * 8,
52	0	CHACHA20_POLY1305_MODE,
53	0	CHACHA20_POLY1305_FLAGS,
54	0	ossl_prov_cipher_hw_chacha20_poly1305(
55	0	CHACHA20_POLY1305_KEYLEN * 8),
56	0	NULL);
57	0	ctx->tls_payload_length = NO_TLS_PAYLOAD_LENGTH;
58	0	ossl_chacha20_initctx(&ctx->chacha);
59	0	}
60	0	return ctx;
61	0	}
62
63		static void chacha20_poly1305_dupctx(void provctx)
64	0	{
65	0	PROV_CHACHA20_POLY1305_CTX *ctx = provctx;
66	0	PROV_CHACHA20_POLY1305_CTX *dctx = NULL;
67
68	0	if (ctx == NULL)
69	0	return NULL;
70	0	dctx = OPENSSL_memdup(ctx, sizeof(*ctx));
71	0	if (dctx != NULL
72	0	&& !ossl_cipher_generic_dupctx_tlsmac(&dctx->base, &ctx->base)) {
73	0	OPENSSL_clear_free(dctx, sizeof(*dctx));
74	0	return NULL;
75	0	}
76	0	return dctx;
77	0	}
78
79		static void chacha20_poly1305_freectx(void *vctx)
80	0	{
81	0	PROV_CHACHA20_POLY1305_CTX ctx = (PROV_CHACHA20_POLY1305_CTX )vctx;
82
83	0	if (ctx != NULL) {
84	0	ossl_cipher_generic_reset_ctx((PROV_CIPHER_CTX *)vctx);
85	0	OPENSSL_clear_free(ctx, sizeof(*ctx));
86	0	}
87	0	}
88
89		static int chacha20_poly1305_get_params(OSSL_PARAM params[])
90	1	{
91	1	return ossl_cipher_generic_get_params(params, 0, CHACHA20_POLY1305_FLAGS,
92	1	CHACHA20_POLY1305_KEYLEN * 8,
93	1	CHACHA20_POLY1305_BLKLEN * 8,
94	1	CHACHA20_POLY1305_IVLEN * 8);
95	1	}
96
97		static int chacha20_poly1305_get_ctx_params(void *vctx, OSSL_PARAM params[])
98	0	{
99	0	PROV_CHACHA20_POLY1305_CTX ctx = (PROV_CHACHA20_POLY1305_CTX )vctx;
100	0	struct chacha20_poly1305_get_ctx_params_st p;
101
102	0	if (ctx == NULL \|\| !chacha20_poly1305_get_ctx_params_decoder(params, &p))
103	0	return 0;
104
105	0	if (p.ivlen != NULL
106	0	&& !OSSL_PARAM_set_size_t(p.ivlen, CHACHA20_POLY1305_IVLEN)) {
107	0	ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
108	0	return 0;
109	0	}
110
111	0	if (p.keylen != NULL
112	0	&& !OSSL_PARAM_set_size_t(p.keylen, CHACHA20_POLY1305_KEYLEN)) {
113	0	ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
114	0	return 0;
115	0	}
116
117		/* tag_len == 0 means no tag set yet, report the default */
118	0	if (p.taglen != NULL
119	0	&& !OSSL_PARAM_set_size_t(p.taglen,
120	0	ctx->tag_len == 0 ? POLY1305_BLOCK_SIZE : ctx->tag_len)) {
121	0	ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
122	0	return 0;
123	0	}
124
125	0	if (p.pad != NULL
126	0	&& !OSSL_PARAM_set_size_t(p.pad, ctx->tls_aad_pad_sz)) {
127	0	ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
128	0	return 0;
129	0	}
130
131	0	if (p.tag != NULL) {
132	0	if (p.tag->data_type != OSSL_PARAM_OCTET_STRING) {
133	0	ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
134	0	return 0;
135	0	}
136	0	if (!ctx->base.enc) {
137	0	ERR_raise(ERR_LIB_PROV, PROV_R_TAG_NOT_SET);
138	0	return 0;
139	0	}
140	0	if (p.tag->data_size == 0 \|\| p.tag->data_size > POLY1305_BLOCK_SIZE) {
141	0	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_TAG_LENGTH);
142	0	return 0;
143	0	}
144	0	memcpy(p.tag->data, ctx->tag, p.tag->data_size);
145	0	}
146	0	return 1;
147	0	}
148
149		static const OSSL_PARAM chacha20_poly1305_gettable_ctx_params(ossl_unused void cctx, ossl_unused void *provctx)
150	1	{
151	1	return chacha20_poly1305_get_ctx_params_list;
152	1	}
153
154		static const OSSL_PARAM *chacha20_poly1305_settable_ctx_params(
155		ossl_unused void cctx, ossl_unused void provctx)
156	0	{
157	0	return chacha20_poly1305_set_ctx_params_list;
158	0	}
159
160		static int chacha20_poly1305_set_ctx_params(void *vctx,
161		const OSSL_PARAM params[])
162	0	{
163	0	size_t len;
164	0	PROV_CHACHA20_POLY1305_CTX ctx = (PROV_CHACHA20_POLY1305_CTX )vctx;
165	0	PROV_CIPHER_HW_CHACHA20_POLY1305 hw = (PROV_CIPHER_HW_CHACHA20_POLY1305 )ctx->base.hw;
166	0	struct chacha20_poly1305_set_ctx_params_st p;
167
168	0	if (!chacha20_poly1305_set_ctx_params_decoder(params, &p))
169	0	return 0;
170
171	0	if (p.keylen != NULL) {
172	0	if (!OSSL_PARAM_get_size_t(p.keylen, &len)) {
173	0	ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
174	0	return 0;
175	0	}
176	0	if (len != CHACHA20_POLY1305_KEYLEN) {
177	0	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
178	0	return 0;
179	0	}
180	0	}
181
182	0	if (p.ivlen != NULL) {
183	0	if (!OSSL_PARAM_get_size_t(p.ivlen, &len)) {
184	0	ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
185	0	return 0;
186	0	}
187	0	if (len != CHACHA20_POLY1305_MAX_IVLEN) {
188	0	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH);
189	0	return 0;
190	0	}
191	0	ctx->iv_state = IV_STATE_UNINITIALISED;
192	0	}
193
194	0	if (p.tag != NULL) {
195	0	if (p.tag->data_type != OSSL_PARAM_OCTET_STRING) {
196	0	ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
197	0	return 0;
198	0	}
199	0	if (p.tag->data_size == 0 \|\| p.tag->data_size > POLY1305_BLOCK_SIZE) {
200	0	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_TAG_LENGTH);
201	0	return 0;
202	0	}
203	0	if (p.tag->data != NULL) {
204	0	if (ctx->base.enc) {
205	0	ERR_raise(ERR_LIB_PROV, PROV_R_TAG_NOT_NEEDED);
206	0	return 0;
207	0	}
208	0	memcpy(ctx->tag, p.tag->data, p.tag->data_size);
209	0	}
210	0	ctx->tag_len = p.tag->data_size;
211	0	}
212
213	0	if (p.aad != NULL) {
214	0	if (p.aad->data_type != OSSL_PARAM_OCTET_STRING) {
215	0	ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
216	0	return 0;
217	0	}
218	0	len = hw->tls_init(&ctx->base, p.aad->data, p.aad->data_size);
219	0	if (len == 0) {
220	0	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DATA);
221	0	return 0;
222	0	}
223	0	ctx->tls_aad_pad_sz = len;
224	0	}
225
226	0	if (p.fixed != NULL) {
227	0	if (p.fixed->data_type != OSSL_PARAM_OCTET_STRING) {
228	0	ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
229	0	return 0;
230	0	}
231	0	if (hw->tls_iv_set_fixed(&ctx->base, p.fixed->data,
232	0	p.fixed->data_size)
233	0	== 0) {
234	0	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH);
235	0	return 0;
236	0	}
237	0	}
238	0	return 1;
239	0	}
240
241		static int chacha20_poly1305_einit(void vctx, const unsigned char key,
242		size_t keylen, const unsigned char *iv,
243		size_t ivlen, const OSSL_PARAM params[])
244	0	{
245	0	int ret;
246
247		/* The generic function checks for ossl_prov_is_running() */
248	0	ret = ossl_cipher_generic_einit(vctx, key, keylen, iv, ivlen, NULL);
249	0	if (ret && iv != NULL) {
250	0	PROV_CIPHER_CTX ctx = (PROV_CIPHER_CTX )vctx;
251	0	PROV_CHACHA20_POLY1305_CTX cctx = (PROV_CHACHA20_POLY1305_CTX )vctx;
252	0	PROV_CIPHER_HW_CHACHA20_POLY1305 hw = (PROV_CIPHER_HW_CHACHA20_POLY1305 )ctx->hw;
253
254	0	hw->initiv(ctx);
255	0	cctx->iv_state = IV_STATE_BUFFERED;
256	0	}
257	0	if (ret && !chacha20_poly1305_set_ctx_params(vctx, params))
258	0	ret = 0;
259	0	return ret;
260	0	}
261
262		static int chacha20_poly1305_dinit(void vctx, const unsigned char key,
263		size_t keylen, const unsigned char *iv,
264		size_t ivlen, const OSSL_PARAM params[])
265	0	{
266	0	int ret;
267
268		/* The generic function checks for ossl_prov_is_running() */
269	0	ret = ossl_cipher_generic_dinit(vctx, key, keylen, iv, ivlen, NULL);
270	0	if (ret && iv != NULL) {
271	0	PROV_CIPHER_CTX ctx = (PROV_CIPHER_CTX )vctx;
272	0	PROV_CHACHA20_POLY1305_CTX cctx = (PROV_CHACHA20_POLY1305_CTX )vctx;
273	0	PROV_CIPHER_HW_CHACHA20_POLY1305 hw = (PROV_CIPHER_HW_CHACHA20_POLY1305 )ctx->hw;
274
275	0	hw->initiv(ctx);
276	0	cctx->iv_state = IV_STATE_BUFFERED;
277	0	}
278	0	if (ret && !chacha20_poly1305_set_ctx_params(vctx, params))
279	0	ret = 0;
280	0	return ret;
281	0	}
282
283		static int chacha20_poly1305_cipher(void vctx, unsigned char out,
284		size_t *outl, size_t outsize,
285		const unsigned char *in, size_t inl)
286	0	{
287	0	PROV_CIPHER_CTX ctx = (PROV_CIPHER_CTX )vctx;
288	0	PROV_CIPHER_HW_CHACHA20_POLY1305 hw = (PROV_CIPHER_HW_CHACHA20_POLY1305 )ctx->hw;
289
290	0	if (!ossl_prov_is_running())
291	0	return 0;
292
293	0	if (outsize < inl) {
294	0	ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
295	0	return 0;
296	0	}
297
298	0	if (!hw->aead_cipher(ctx, out, outl, in, inl))
299	0	return 0;
300
301	0	return 1;
302	0	}
303
304		static int chacha20_poly1305_update(void vctx, unsigned char out,
305		size_t *outl, size_t outsize,
306		const unsigned char *in, size_t inl)
307	0	{
308	0	PROV_CHACHA20_POLY1305_CTX ctx = (PROV_CHACHA20_POLY1305_CTX )vctx;
309
310	0	if (ctx->iv_state == IV_STATE_FINISHED)
311	0	return 0;
312
313		/*
314		* a zero-length update is a nop, ALWAYS SUCCEED via early exit
315		* NB: ONLY EVP_Cipher() / final produce or check the tag
316		*/
317	0	if (inl == 0) {
318	0	*outl = 0;
319	0	return 1;
320	0	}
321
322	0	return chacha20_poly1305_cipher(vctx, out, outl, outsize, in, inl);
323	0	}
324
325		static int chacha20_poly1305_final(void vctx, unsigned char out, size_t *outl,
326		size_t outsize)
327	0	{
328	0	PROV_CHACHA20_POLY1305_CTX ctx = (PROV_CHACHA20_POLY1305_CTX )vctx;
329	0	PROV_CIPHER_HW_CHACHA20_POLY1305 hw = (PROV_CIPHER_HW_CHACHA20_POLY1305 )ctx->base.hw;
330
331	0	if (!ossl_prov_is_running())
332	0	return 0;
333
334		/* The tag must be set before actually decrypting data */
335	0	if (!ctx->base.enc && ctx->tag_len == 0) {
336	0	ERR_raise(ERR_LIB_PROV, PROV_R_TAG_NOT_SET);
337	0	return 0;
338	0	}
339
340	0	if (hw->aead_cipher((PROV_CIPHER_CTX *)ctx, out, outl, NULL, 0) <= 0)
341	0	return 0;
342
343	0	*outl = 0;
344
345		/* Don't reuse the IV */
346	0	ctx->iv_state = IV_STATE_FINISHED;
347	0	return 1;
348	0	}
349
350		/* ossl_chacha20_ossl_poly1305_functions */
351		const OSSL_DISPATCH ossl_chacha20_ossl_poly1305_functions[] = {
352		{ OSSL_FUNC_CIPHER_NEWCTX, (void (*)(void))chacha20_poly1305_newctx },
353		{ OSSL_FUNC_CIPHER_FREECTX, (void (*)(void))chacha20_poly1305_freectx },
354		{ OSSL_FUNC_CIPHER_DUPCTX, (void (*)(void))chacha20_poly1305_dupctx },
355		{ OSSL_FUNC_CIPHER_ENCRYPT_INIT, (void (*)(void))chacha20_poly1305_einit },
356		{ OSSL_FUNC_CIPHER_DECRYPT_INIT, (void (*)(void))chacha20_poly1305_dinit },
357		{ OSSL_FUNC_CIPHER_UPDATE, (void (*)(void))chacha20_poly1305_update },
358		{ OSSL_FUNC_CIPHER_FINAL, (void (*)(void))chacha20_poly1305_final },
359		{ OSSL_FUNC_CIPHER_CIPHER, (void (*)(void))chacha20_poly1305_cipher },
360		{ OSSL_FUNC_CIPHER_GET_PARAMS,
361		(void (*)(void))chacha20_poly1305_get_params },
362		{ OSSL_FUNC_CIPHER_GETTABLE_PARAMS,
363		(void (*)(void))chacha20_poly1305_gettable_params },
364		{ OSSL_FUNC_CIPHER_GET_CTX_PARAMS,
365		(void (*)(void))chacha20_poly1305_get_ctx_params },
366		{ OSSL_FUNC_CIPHER_GETTABLE_CTX_PARAMS,
367		(void (*)(void))chacha20_poly1305_gettable_ctx_params },
368		{ OSSL_FUNC_CIPHER_SET_CTX_PARAMS,
369		(void (*)(void))chacha20_poly1305_set_ctx_params },
370		{ OSSL_FUNC_CIPHER_SETTABLE_CTX_PARAMS,
371		(void (*)(void))chacha20_poly1305_settable_ctx_params },
372		OSSL_DISPATCH_END
373		};