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

Source
/*
 * Copyright 2019-2025 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 ccm mode */

#include <openssl/proverr.h>
#include "prov/ciphercommon.h"
#include "prov/ciphercommon_ccm.h"
#include "prov/providercommon.h"

#include "providers/implementations/ciphers/ciphercommon_ccm.inc"

static int ccm_cipher_internal(PROV_CCM_CTX *ctx, unsigned char *out,
                               size_t *padlen, const unsigned char *in,
                               size_t len);

static int ccm_tls_init(PROV_CCM_CTX *ctx, unsigned char *aad, size_t alen)
{
    size_t len;

    if (!ossl_prov_is_running() || alen != EVP_AEAD_TLS1_AAD_LEN)
        return 0;

    /* Save the aad for later use. */
    memcpy(ctx->buf, aad, alen);
    ctx->tls_aad_len = alen;

    len = ctx->buf[alen - 2] << 8 | ctx->buf[alen - 1];
    if (len < EVP_CCM_TLS_EXPLICIT_IV_LEN)
        return 0;

    /* Correct length for explicit iv. */
    len -= EVP_CCM_TLS_EXPLICIT_IV_LEN;

    if (!ctx->enc) {
        if (len < ctx->m)
            return 0;
        /* Correct length for tag. */
        len -= ctx->m;
    }
    ctx->buf[alen - 2] = (unsigned char)(len >> 8);
    ctx->buf[alen - 1] = (unsigned char)(len & 0xff);

    /* Extra padding: tag appended to record. */
    return (int)ctx->m;
}

static int ccm_tls_iv_set_fixed(PROV_CCM_CTX *ctx, unsigned char *fixed,
                                size_t flen)
{
    if (flen != EVP_CCM_TLS_FIXED_IV_LEN)
        return 0;

    /* Copy to first part of the iv. */
    memcpy(ctx->iv, fixed, flen);
    return 1;
}

static size_t ccm_get_ivlen(PROV_CCM_CTX *ctx)
{
    return 15 - ctx->l;
}

const OSSL_PARAM *ossl_ccm_settable_ctx_params(
        ossl_unused void *cctx, ossl_unused void *provctx
    )
{
    return ossl_cipher_ccm_set_ctx_params_list;
}

int ossl_ccm_set_ctx_params(void *vctx, const OSSL_PARAM params[])
{
    PROV_CCM_CTX *ctx = (PROV_CCM_CTX *)vctx;
    size_t sz, ivlen;
    struct ossl_cipher_ccm_set_ctx_params_st p;

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

    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 & 1) || (p.tag->data_size < 4) || p.tag->data_size > 16) {
            ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_TAG_LENGTH);
            return 0;
        }

        if (p.tag->data != NULL) {
            if (ctx->enc) {
                ERR_raise(ERR_LIB_PROV, PROV_R_TAG_NOT_NEEDED);
                return 0;
            }
            memcpy(ctx->buf, p.tag->data, p.tag->data_size);
            ctx->tag_set = 1;
        }
        ctx->m = p.tag->data_size;
    }

    if (p.ivlen != NULL) {
        if (!OSSL_PARAM_get_size_t(p.ivlen, &sz)) {
            ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
            return 0;
        }
        ivlen = 15 - sz;
        if (ivlen < 2 || ivlen > 8) {
            ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH);
            return 0;
        }
        if (ctx->l != ivlen) {
            ctx->l = ivlen;
            ctx->iv_set = 0;
        }
    }

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

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

const OSSL_PARAM *ossl_ccm_gettable_ctx_params(
        ossl_unused void *cctx, ossl_unused void *provctx
    )
{
    return ossl_cipher_ccm_get_ctx_params_list;
}

int ossl_ccm_get_ctx_params(void *vctx, OSSL_PARAM params[])
{
    PROV_CCM_CTX *ctx = (PROV_CCM_CTX *)vctx;
    struct ossl_cipher_ccm_get_ctx_params_st p;

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

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

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

    if (p.iv != NULL) {
        if (ccm_get_ivlen(ctx) > p.iv->data_size) {
            ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH);
            return 0;
        }
        if (!OSSL_PARAM_set_octet_string_or_ptr(p.iv, ctx->iv, p.iv->data_size)) {
            ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
            return 0;
        }
    }

    if (p.updiv != NULL) {
        if (ccm_get_ivlen(ctx) > p.updiv->data_size) {
            ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH);
            return 0;
        }
        if (!OSSL_PARAM_set_octet_string_or_ptr(p.updiv, ctx->iv, p.updiv->data_size)) {
            ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
            return 0;
        }
    }

    if (p.keylen != NULL && !OSSL_PARAM_set_size_t(p.keylen, ctx->keylen)) {
        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 (!ctx->enc || !ctx->tag_set) {
            ERR_raise(ERR_LIB_PROV, PROV_R_TAG_NOT_SET);
            return 0;
        }
        if (p.tag->data_type != OSSL_PARAM_OCTET_STRING) {
            ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
            return 0;
        }
        if (!ctx->hw->gettag(ctx, p.tag->data, p.tag->data_size))
            return 0;
        ctx->tag_set = 0;
        ctx->iv_set = 0;
        ctx->len_set = 0;
    }

    return 1;
}

static int ccm_init(void *vctx, const unsigned char *key, size_t keylen,
                    const unsigned char *iv, size_t ivlen,
                    const OSSL_PARAM params[], int enc)
{
    PROV_CCM_CTX *ctx = (PROV_CCM_CTX *)vctx;

    if (!ossl_prov_is_running())
        return 0;

    ctx->enc = enc;

    if (iv != NULL) {
        if (ivlen != ccm_get_ivlen(ctx)) {
            ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH);
            return 0;
        }
        memcpy(ctx->iv, iv, ivlen);
        ctx->iv_set = 1;
    }
    if (key != NULL) {
        if (keylen != ctx->keylen) {
            ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
            return 0;
        }
        if (!ctx->hw->setkey(ctx, key, keylen))
            return 0;
    }
    return ossl_ccm_set_ctx_params(ctx, params);
}

int ossl_ccm_einit(void *vctx, const unsigned char *key, size_t keylen,
                   const unsigned char *iv, size_t ivlen,
                   const OSSL_PARAM params[])
{
    return ccm_init(vctx, key, keylen, iv, ivlen, params, 1);
}

int ossl_ccm_dinit(void *vctx, const unsigned char *key, size_t keylen,
                   const unsigned char *iv, size_t ivlen,
                   const OSSL_PARAM params[])
{
    return ccm_init(vctx, key, keylen, iv, ivlen, params, 0);
}

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

    if (outsize < inl) {
        ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
        return 0;
    }

    if (!ccm_cipher_internal(ctx, out, outl, in, inl)) {
        ERR_raise(ERR_LIB_PROV, PROV_R_CIPHER_OPERATION_FAILED);
        return 0;
    }
    return 1;
}

int ossl_ccm_stream_final(void *vctx, unsigned char *out, size_t *outl,
                          size_t outsize)
{
    PROV_CCM_CTX *ctx = (PROV_CCM_CTX *)vctx;
    int i;

    if (!ossl_prov_is_running())
        return 0;

    i = ccm_cipher_internal(ctx, out, outl, NULL, 0);
    if (i <= 0)
        return 0;

    *outl = 0;
    return 1;
}

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

    if (!ossl_prov_is_running())
        return 0;

    if (outsize < inl) {
        ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
        return 0;
    }

    if (ccm_cipher_internal(ctx, out, outl, in, inl) <= 0)
        return 0;

    *outl = inl;
    return 1;
}

/* Copy the buffered iv */
static int ccm_set_iv(PROV_CCM_CTX *ctx, size_t mlen)
{
    const PROV_CCM_HW *hw = ctx->hw;

    if (!hw->setiv(ctx, ctx->iv, ccm_get_ivlen(ctx), mlen))
        return 0;
    ctx->len_set = 1;
    return 1;
}

static int ccm_tls_cipher(PROV_CCM_CTX *ctx,
                          unsigned char *out, size_t *padlen,
                          const unsigned char *in, size_t len)
{
    int rv = 0;
    size_t olen = 0;

    if (!ossl_prov_is_running())
        goto err;

    /* Encrypt/decrypt must be performed in place */
    if (in == NULL || out != in || len < EVP_CCM_TLS_EXPLICIT_IV_LEN + ctx->m)
        goto err;

    /* If encrypting set explicit IV from sequence number (start of AAD) */
    if (ctx->enc)
        memcpy(out, ctx->buf, EVP_CCM_TLS_EXPLICIT_IV_LEN);
    /* Get rest of IV from explicit IV */
    memcpy(ctx->iv + EVP_CCM_TLS_FIXED_IV_LEN, in, EVP_CCM_TLS_EXPLICIT_IV_LEN);
    /* Correct length value */
    len -= EVP_CCM_TLS_EXPLICIT_IV_LEN + ctx->m;
    if (!ccm_set_iv(ctx, len))
        goto err;

    /* Use saved AAD */
    if (!ctx->hw->setaad(ctx, ctx->buf, ctx->tls_aad_len))
        goto err;

    /* Fix buffer to point to payload */
    in += EVP_CCM_TLS_EXPLICIT_IV_LEN;
    out += EVP_CCM_TLS_EXPLICIT_IV_LEN;
    if (ctx->enc) {
        if (!ctx->hw->auth_encrypt(ctx, in, out, len,  out + len, ctx->m))
            goto err;
        olen = len + EVP_CCM_TLS_EXPLICIT_IV_LEN + ctx->m;
    } else {
        if (!ctx->hw->auth_decrypt(ctx, in, out, len,
                                   (unsigned char *)in + len, ctx->m))
            goto err;
        olen = len;
    }
    rv = 1;
err:
    *padlen = olen;
    return rv;
}

static int ccm_cipher_internal(PROV_CCM_CTX *ctx, unsigned char *out,
                               size_t *padlen, const unsigned char *in,
                               size_t len)
{
    int rv = 0;
    size_t olen = 0;
    const PROV_CCM_HW *hw = ctx->hw;

    /* If no key set, return error */
    if (!ctx->key_set)
        return 0;

    if (ctx->tls_aad_len != UNINITIALISED_SIZET)
        return ccm_tls_cipher(ctx, out, padlen, in, len);

    /* EVP_*Final() doesn't return any data */
    if (in == NULL && out != NULL)
        goto finish;

    if (!ctx->iv_set)
        goto err;

    if (out == NULL) {
        if (in == NULL) {
            if (!ccm_set_iv(ctx, len))
                goto err;
        } else {
            /* If we have AAD, we need a message length */
            if (!ctx->len_set && len)
                goto err;
            if (!hw->setaad(ctx, in, len))
                goto err;
        }
    } else {
        /* If not set length yet do it */
        if (!ctx->len_set && !ccm_set_iv(ctx, len))
            goto err;

        if (ctx->enc) {
            if (!hw->auth_encrypt(ctx, in, out, len, NULL, 0))
                goto err;
            ctx->tag_set = 1;
        } else {
            /* The tag must be set before actually decrypting data */
            if (!ctx->tag_set) {
                ERR_raise(ERR_LIB_PROV, PROV_R_TAG_NOT_SET);
                goto err;
            }

            if (!hw->auth_decrypt(ctx, in, out, len, ctx->buf, ctx->m))
                goto err;
            /* Finished - reset flags so calling this method again will fail */
            ctx->iv_set = 0;
            ctx->tag_set = 0;
            ctx->len_set = 0;
        }
    }
    olen = len;
finish:
    rv = 1;
err:
    *padlen = olen;
    return rv;
}

void ossl_ccm_initctx(PROV_CCM_CTX *ctx, size_t keybits, const PROV_CCM_HW *hw)
{
    ctx->keylen = keybits / 8;
    ctx->key_set = 0;
    ctx->iv_set = 0;
    ctx->tag_set = 0;
    ctx->len_set = 0;
    ctx->l = 8;
    ctx->m = 12;
    ctx->tls_aad_len = UNINITIALISED_SIZET;
    ctx->hw = hw;
}

Coverage Report

Created: 2025-11-07 06:36

Line	Count	Source
1		/*
2		* Copyright 2019-2025 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 ccm mode */
11
12		#include <openssl/proverr.h>
13		#include "prov/ciphercommon.h"
14		#include "prov/ciphercommon_ccm.h"
15		#include "prov/providercommon.h"
16
17		#include "providers/implementations/ciphers/ciphercommon_ccm.inc"
18
19		static int ccm_cipher_internal(PROV_CCM_CTX ctx, unsigned char out,
20		size_t padlen, const unsigned char in,
21		size_t len);
22
23		static int ccm_tls_init(PROV_CCM_CTX ctx, unsigned char aad, size_t alen)
24	0	{
25	0	size_t len;
26
27	0	if (!ossl_prov_is_running() \|\| alen != EVP_AEAD_TLS1_AAD_LEN)
28	0	return 0;
29
30		/* Save the aad for later use. */
31	0	memcpy(ctx->buf, aad, alen);
32	0	ctx->tls_aad_len = alen;
33
34	0	len = ctx->buf[alen - 2] << 8 \| ctx->buf[alen - 1];
35	0	if (len < EVP_CCM_TLS_EXPLICIT_IV_LEN)
36	0	return 0;
37
38		/* Correct length for explicit iv. */
39	0	len -= EVP_CCM_TLS_EXPLICIT_IV_LEN;
40
41	0	if (!ctx->enc) {
42	0	if (len < ctx->m)
43	0	return 0;
44		/* Correct length for tag. */
45	0	len -= ctx->m;
46	0	}
47	0	ctx->buf[alen - 2] = (unsigned char)(len >> 8);
48	0	ctx->buf[alen - 1] = (unsigned char)(len & 0xff);
49
50		/* Extra padding: tag appended to record. */
51	0	return (int)ctx->m;
52	0	}
53
54		static int ccm_tls_iv_set_fixed(PROV_CCM_CTX ctx, unsigned char fixed,
55		size_t flen)
56	0	{
57	0	if (flen != EVP_CCM_TLS_FIXED_IV_LEN)
58	0	return 0;
59
60		/* Copy to first part of the iv. */
61	0	memcpy(ctx->iv, fixed, flen);
62	0	return 1;
63	0	}
64
65		static size_t ccm_get_ivlen(PROV_CCM_CTX *ctx)
66	0	{
67	0	return 15 - ctx->l;
68	0	}
69
70		const OSSL_PARAM *ossl_ccm_settable_ctx_params(
71		ossl_unused void cctx, ossl_unused void provctx
72		)
73	0	{
74	0	return ossl_cipher_ccm_set_ctx_params_list;
75	0	}
76
77		int ossl_ccm_set_ctx_params(void *vctx, const OSSL_PARAM params[])
78	0	{
79	0	PROV_CCM_CTX ctx = (PROV_CCM_CTX )vctx;
80	0	size_t sz, ivlen;
81	0	struct ossl_cipher_ccm_set_ctx_params_st p;
82
83	0	if (ctx == NULL \|\| !ossl_cipher_ccm_set_ctx_params_decoder(params, &p))
84	0	return 0;
85
86	0	if (p.tag != NULL) {
87	0	if (p.tag->data_type != OSSL_PARAM_OCTET_STRING) {
88	0	ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
89	0	return 0;
90	0	}
91	0	if ((p.tag->data_size & 1) \|\| (p.tag->data_size < 4) \|\| p.tag->data_size > 16) {
92	0	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_TAG_LENGTH);
93	0	return 0;
94	0	}
95
96	0	if (p.tag->data != NULL) {
97	0	if (ctx->enc) {
98	0	ERR_raise(ERR_LIB_PROV, PROV_R_TAG_NOT_NEEDED);
99	0	return 0;
100	0	}
101	0	memcpy(ctx->buf, p.tag->data, p.tag->data_size);
102	0	ctx->tag_set = 1;
103	0	}
104	0	ctx->m = p.tag->data_size;
105	0	}
106
107	0	if (p.ivlen != NULL) {
108	0	if (!OSSL_PARAM_get_size_t(p.ivlen, &sz)) {
109	0	ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
110	0	return 0;
111	0	}
112	0	ivlen = 15 - sz;
113	0	if (ivlen < 2 \|\| ivlen > 8) {
114	0	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH);
115	0	return 0;
116	0	}
117	0	if (ctx->l != ivlen) {
118	0	ctx->l = ivlen;
119	0	ctx->iv_set = 0;
120	0	}
121	0	}
122
123	0	if (p.aad != NULL) {
124	0	if (p.aad->data_type != OSSL_PARAM_OCTET_STRING) {
125	0	ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
126	0	return 0;
127	0	}
128	0	sz = ccm_tls_init(ctx, p.aad->data, p.aad->data_size);
129	0	if (sz == 0) {
130	0	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DATA);
131	0	return 0;
132	0	}
133	0	ctx->tls_aad_pad_sz = sz;
134	0	}
135
136	0	if (p.fixed != NULL) {
137	0	if (p.fixed->data_type != OSSL_PARAM_OCTET_STRING) {
138	0	ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_GET_PARAMETER);
139	0	return 0;
140	0	}
141	0	if (ccm_tls_iv_set_fixed(ctx, p.fixed->data, p.fixed->data_size) == 0) {
142	0	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH);
143	0	return 0;
144	0	}
145	0	}
146	0	return 1;
147	0	}
148
149		const OSSL_PARAM *ossl_ccm_gettable_ctx_params(
150		ossl_unused void cctx, ossl_unused void provctx
151		)
152	112	{
153	112	return ossl_cipher_ccm_get_ctx_params_list;
154	112	}
155
156		int ossl_ccm_get_ctx_params(void *vctx, OSSL_PARAM params[])
157	0	{
158	0	PROV_CCM_CTX ctx = (PROV_CCM_CTX )vctx;
159	0	struct ossl_cipher_ccm_get_ctx_params_st p;
160
161	0	if (ctx == NULL \|\| !ossl_cipher_ccm_get_ctx_params_decoder(params, &p))
162	0	return 0;
163
164	0	if (p.ivlen != NULL && !OSSL_PARAM_set_size_t(p.ivlen, ccm_get_ivlen(ctx))) {
165	0	ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
166	0	return 0;
167	0	}
168
169	0	if (p.taglen != NULL && !OSSL_PARAM_set_size_t(p.taglen, ctx->m)) {
170	0	ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
171	0	return 0;
172	0	}
173
174	0	if (p.iv != NULL) {
175	0	if (ccm_get_ivlen(ctx) > p.iv->data_size) {
176	0	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH);
177	0	return 0;
178	0	}
179	0	if (!OSSL_PARAM_set_octet_string_or_ptr(p.iv, ctx->iv, p.iv->data_size)) {
180	0	ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
181	0	return 0;
182	0	}
183	0	}
184
185	0	if (p.updiv != NULL) {
186	0	if (ccm_get_ivlen(ctx) > p.updiv->data_size) {
187	0	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH);
188	0	return 0;
189	0	}
190	0	if (!OSSL_PARAM_set_octet_string_or_ptr(p.updiv, ctx->iv, p.updiv->data_size)) {
191	0	ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
192	0	return 0;
193	0	}
194	0	}
195
196	0	if (p.keylen != NULL && !OSSL_PARAM_set_size_t(p.keylen, ctx->keylen)) {
197	0	ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
198	0	return 0;
199	0	}
200
201	0	if (p.pad != NULL && !OSSL_PARAM_set_size_t(p.pad, ctx->tls_aad_pad_sz)) {
202	0	ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
203	0	return 0;
204	0	}
205
206	0	if (p.tag != NULL) {
207	0	if (!ctx->enc \|\| !ctx->tag_set) {
208	0	ERR_raise(ERR_LIB_PROV, PROV_R_TAG_NOT_SET);
209	0	return 0;
210	0	}
211	0	if (p.tag->data_type != OSSL_PARAM_OCTET_STRING) {
212	0	ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
213	0	return 0;
214	0	}
215	0	if (!ctx->hw->gettag(ctx, p.tag->data, p.tag->data_size))
216	0	return 0;
217	0	ctx->tag_set = 0;
218	0	ctx->iv_set = 0;
219	0	ctx->len_set = 0;
220	0	}
221
222	0	return 1;
223	0	}
224
225		static int ccm_init(void vctx, const unsigned char key, size_t keylen,
226		const unsigned char *iv, size_t ivlen,
227		const OSSL_PARAM params[], int enc)
228	0	{
229	0	PROV_CCM_CTX ctx = (PROV_CCM_CTX )vctx;
230
231	0	if (!ossl_prov_is_running())
232	0	return 0;
233
234	0	ctx->enc = enc;
235
236	0	if (iv != NULL) {
237	0	if (ivlen != ccm_get_ivlen(ctx)) {
238	0	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_IV_LENGTH);
239	0	return 0;
240	0	}
241	0	memcpy(ctx->iv, iv, ivlen);
242	0	ctx->iv_set = 1;
243	0	}
244	0	if (key != NULL) {
245	0	if (keylen != ctx->keylen) {
246	0	ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
247	0	return 0;
248	0	}
249	0	if (!ctx->hw->setkey(ctx, key, keylen))
250	0	return 0;
251	0	}
252	0	return ossl_ccm_set_ctx_params(ctx, params);
253	0	}
254
255		int ossl_ccm_einit(void vctx, const unsigned char key, size_t keylen,
256		const unsigned char *iv, size_t ivlen,
257		const OSSL_PARAM params[])
258	0	{
259	0	return ccm_init(vctx, key, keylen, iv, ivlen, params, 1);
260	0	}
261
262		int ossl_ccm_dinit(void vctx, const unsigned char key, size_t keylen,
263		const unsigned char *iv, size_t ivlen,
264		const OSSL_PARAM params[])
265	0	{
266	0	return ccm_init(vctx, key, keylen, iv, ivlen, params, 0);
267	0	}
268
269		int ossl_ccm_stream_update(void vctx, unsigned char out, size_t *outl,
270		size_t outsize, const unsigned char *in,
271		size_t inl)
272	0	{
273	0	PROV_CCM_CTX ctx = (PROV_CCM_CTX )vctx;
274
275	0	if (outsize < inl) {
276	0	ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
277	0	return 0;
278	0	}
279
280	0	if (!ccm_cipher_internal(ctx, out, outl, in, inl)) {
281	0	ERR_raise(ERR_LIB_PROV, PROV_R_CIPHER_OPERATION_FAILED);
282	0	return 0;
283	0	}
284	0	return 1;
285	0	}
286
287		int ossl_ccm_stream_final(void vctx, unsigned char out, size_t *outl,
288		size_t outsize)
289	0	{
290	0	PROV_CCM_CTX ctx = (PROV_CCM_CTX )vctx;
291	0	int i;
292
293	0	if (!ossl_prov_is_running())
294	0	return 0;
295
296	0	i = ccm_cipher_internal(ctx, out, outl, NULL, 0);
297	0	if (i <= 0)
298	0	return 0;
299
300	0	*outl = 0;
301	0	return 1;
302	0	}
303
304		int ossl_ccm_cipher(void vctx, unsigned char out, size_t *outl, size_t outsize,
305		const unsigned char *in, size_t inl)
306	0	{
307	0	PROV_CCM_CTX ctx = (PROV_CCM_CTX )vctx;
308
309	0	if (!ossl_prov_is_running())
310	0	return 0;
311
312	0	if (outsize < inl) {
313	0	ERR_raise(ERR_LIB_PROV, PROV_R_OUTPUT_BUFFER_TOO_SMALL);
314	0	return 0;
315	0	}
316
317	0	if (ccm_cipher_internal(ctx, out, outl, in, inl) <= 0)
318	0	return 0;
319
320	0	*outl = inl;
321	0	return 1;
322	0	}
323
324		/* Copy the buffered iv */
325		static int ccm_set_iv(PROV_CCM_CTX *ctx, size_t mlen)
326	0	{
327	0	const PROV_CCM_HW *hw = ctx->hw;
328
329	0	if (!hw->setiv(ctx, ctx->iv, ccm_get_ivlen(ctx), mlen))
330	0	return 0;
331	0	ctx->len_set = 1;
332	0	return 1;
333	0	}
334
335		static int ccm_tls_cipher(PROV_CCM_CTX *ctx,
336		unsigned char out, size_t padlen,
337		const unsigned char *in, size_t len)
338	0	{
339	0	int rv = 0;
340	0	size_t olen = 0;
341
342	0	if (!ossl_prov_is_running())
343	0	goto err;
344
345		/* Encrypt/decrypt must be performed in place */
346	0	if (in == NULL \|\| out != in \|\| len < EVP_CCM_TLS_EXPLICIT_IV_LEN + ctx->m)
347	0	goto err;
348
349		/* If encrypting set explicit IV from sequence number (start of AAD) */
350	0	if (ctx->enc)
351	0	memcpy(out, ctx->buf, EVP_CCM_TLS_EXPLICIT_IV_LEN);
352		/* Get rest of IV from explicit IV */
353	0	memcpy(ctx->iv + EVP_CCM_TLS_FIXED_IV_LEN, in, EVP_CCM_TLS_EXPLICIT_IV_LEN);
354		/* Correct length value */
355	0	len -= EVP_CCM_TLS_EXPLICIT_IV_LEN + ctx->m;
356	0	if (!ccm_set_iv(ctx, len))
357	0	goto err;
358
359		/* Use saved AAD */
360	0	if (!ctx->hw->setaad(ctx, ctx->buf, ctx->tls_aad_len))
361	0	goto err;
362
363		/* Fix buffer to point to payload */
364	0	in += EVP_CCM_TLS_EXPLICIT_IV_LEN;
365	0	out += EVP_CCM_TLS_EXPLICIT_IV_LEN;
366	0	if (ctx->enc) {
367	0	if (!ctx->hw->auth_encrypt(ctx, in, out, len, out + len, ctx->m))
368	0	goto err;
369	0	olen = len + EVP_CCM_TLS_EXPLICIT_IV_LEN + ctx->m;
370	0	} else {
371	0	if (!ctx->hw->auth_decrypt(ctx, in, out, len,
372	0	(unsigned char *)in + len, ctx->m))
373	0	goto err;
374	0	olen = len;
375	0	}
376	0	rv = 1;
377	0	err:
378	0	*padlen = olen;
379	0	return rv;
380	0	}
381
382		static int ccm_cipher_internal(PROV_CCM_CTX ctx, unsigned char out,
383		size_t padlen, const unsigned char in,
384		size_t len)
385	0	{
386	0	int rv = 0;
387	0	size_t olen = 0;
388	0	const PROV_CCM_HW *hw = ctx->hw;
389
390		/* If no key set, return error */
391	0	if (!ctx->key_set)
392	0	return 0;
393
394	0	if (ctx->tls_aad_len != UNINITIALISED_SIZET)
395	0	return ccm_tls_cipher(ctx, out, padlen, in, len);
396
397		/* EVP_Final() doesn't return any data /
398	0	if (in == NULL && out != NULL)
399	0	goto finish;
400
401	0	if (!ctx->iv_set)
402	0	goto err;
403
404	0	if (out == NULL) {
405	0	if (in == NULL) {
406	0	if (!ccm_set_iv(ctx, len))
407	0	goto err;
408	0	} else {
409		/* If we have AAD, we need a message length */
410	0	if (!ctx->len_set && len)
411	0	goto err;
412	0	if (!hw->setaad(ctx, in, len))
413	0	goto err;
414	0	}
415	0	} else {
416		/* If not set length yet do it */
417	0	if (!ctx->len_set && !ccm_set_iv(ctx, len))
418	0	goto err;
419
420	0	if (ctx->enc) {
421	0	if (!hw->auth_encrypt(ctx, in, out, len, NULL, 0))
422	0	goto err;
423	0	ctx->tag_set = 1;
424	0	} else {
425		/* The tag must be set before actually decrypting data */
426	0	if (!ctx->tag_set) {
427	0	ERR_raise(ERR_LIB_PROV, PROV_R_TAG_NOT_SET);
428	0	goto err;
429	0	}
430
431	0	if (!hw->auth_decrypt(ctx, in, out, len, ctx->buf, ctx->m))
432	0	goto err;
433		/* Finished - reset flags so calling this method again will fail */
434	0	ctx->iv_set = 0;
435	0	ctx->tag_set = 0;
436	0	ctx->len_set = 0;
437	0	}
438	0	}
439	0	olen = len;
440	0	finish:
441	0	rv = 1;
442	0	err:
443	0	*padlen = olen;
444	0	return rv;
445	0	}
446
447		void ossl_ccm_initctx(PROV_CCM_CTX ctx, size_t keybits, const PROV_CCM_HW hw)
448	0	{
449	0	ctx->keylen = keybits / 8;
450	0	ctx->key_set = 0;
451	0	ctx->iv_set = 0;
452	0	ctx->tag_set = 0;
453	0	ctx->len_set = 0;
454	0	ctx->l = 8;
455	0	ctx->m = 12;
456	0	ctx->tls_aad_len = UNINITIALISED_SIZET;
457	0	ctx->hw = hw;
458	0	}