[thirdparty/openssl.git] / crypto / cms / cms_enc.c

/*
 * Copyright 2008-2021 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
 */

#include "internal/cryptlib.h"
#include <openssl/asn1t.h>
#include <openssl/pem.h>
#include <openssl/x509v3.h>
#include <openssl/err.h>
#include <openssl/cms.h>
#include <openssl/rand.h>
#include "crypto/evp.h"
#include "cms_local.h"

/* CMS EncryptedData Utilities */

/* Return BIO based on EncryptedContentInfo and key */

BIO *ossl_cms_EncryptedContent_init_bio(CMS_EncryptedContentInfo *ec,
                                        const CMS_CTX *cms_ctx)
{
    BIO *b;
    EVP_CIPHER_CTX *ctx;
    EVP_CIPHER *fetched_ciph = NULL;
    const EVP_CIPHER *cipher = NULL;
    X509_ALGOR *calg = ec->contentEncryptionAlgorithm;
    evp_cipher_aead_asn1_params aparams;
    unsigned char iv[EVP_MAX_IV_LENGTH], *piv = NULL;
    unsigned char *tkey = NULL;
    int len;
    int ivlen = 0;
    size_t tkeylen = 0;
    int ok = 0;
    int enc, keep_key = 0;
    OSSL_LIB_CTX *libctx = ossl_cms_ctx_get0_libctx(cms_ctx);
    const char *propq = ossl_cms_ctx_get0_propq(cms_ctx);

    enc = ec->cipher ? 1 : 0;

    b = BIO_new(BIO_f_cipher());
    if (b == NULL) {
        ERR_raise(ERR_LIB_CMS, ERR_R_BIO_LIB);
        return NULL;
    }

    BIO_get_cipher_ctx(b, &ctx);

    (void)ERR_set_mark();
    if (enc) {
        cipher = ec->cipher;
        /*
         * If not keeping key set cipher to NULL so subsequent calls decrypt.
         */
        if (ec->key != NULL)
            ec->cipher = NULL;
    } else {
        cipher = EVP_get_cipherbyobj(calg->algorithm);
    }
    if (cipher != NULL) {
        fetched_ciph = EVP_CIPHER_fetch(libctx, EVP_CIPHER_get0_name(cipher),
                                        propq);
        if (fetched_ciph != NULL)
            cipher = fetched_ciph;
    }
    if (cipher == NULL) {
        (void)ERR_clear_last_mark();
        ERR_raise(ERR_LIB_CMS, CMS_R_UNKNOWN_CIPHER);
        goto err;
    }
    (void)ERR_pop_to_mark();

    if (EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, enc) <= 0) {
        ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_INITIALISATION_ERROR);
        goto err;
    }

    if (enc) {
        calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_get_type(ctx));
        if (calg->algorithm == NULL) {
            ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_CONTENT_ENCRYPTION_ALGORITHM);
            goto err;
        }
        /* Generate a random IV if we need one */
        ivlen = EVP_CIPHER_CTX_get_iv_length(ctx);
        if (ivlen < 0) {
            ERR_raise(ERR_LIB_CMS, ERR_R_EVP_LIB);
            goto err;
        }

        if (ivlen > 0) {
            if (RAND_bytes_ex(libctx, iv, ivlen, 0) <= 0)
                goto err;
            piv = iv;
        }
    } else {
        if (evp_cipher_asn1_to_param_ex(ctx, calg->parameter, &aparams) <= 0) {
            ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
            goto err;
        }
        if ((EVP_CIPHER_get_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER)) {
            piv = aparams.iv;
            if (ec->taglen > 0
                    && EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_TAG,
                                           ec->taglen, ec->tag) <= 0) {
                ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_AEAD_SET_TAG_ERROR);
                goto err;
            }
        }
    }
    len = EVP_CIPHER_CTX_get_key_length(ctx);
    if (len <= 0)
        goto err;
    tkeylen = (size_t)len;

    /* Generate random session key */
    if (!enc || !ec->key) {
        tkey = OPENSSL_malloc(tkeylen);
        if (tkey == NULL)
            goto err;
        if (EVP_CIPHER_CTX_rand_key(ctx, tkey) <= 0)
            goto err;
    }

    if (!ec->key) {
        ec->key = tkey;
        ec->keylen = tkeylen;
        tkey = NULL;
        if (enc)
            keep_key = 1;
        else
            ERR_clear_error();

    }

    if (ec->keylen != tkeylen) {
        /* If necessary set key length */
        if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0) {
            /*
             * Only reveal failure if debugging so we don't leak information
             * which may be useful in MMA.
             */
            if (enc || ec->debug) {
                ERR_raise(ERR_LIB_CMS, CMS_R_INVALID_KEY_LENGTH);
                goto err;
            } else {
                /* Use random key */
                OPENSSL_clear_free(ec->key, ec->keylen);
                ec->key = tkey;
                ec->keylen = tkeylen;
                tkey = NULL;
                ERR_clear_error();
            }
        }
    }

    if (EVP_CipherInit_ex(ctx, NULL, NULL, ec->key, piv, enc) <= 0) {
        ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_INITIALISATION_ERROR);
        goto err;
    }
    if (enc) {
        calg->parameter = ASN1_TYPE_new();
        if (calg->parameter == NULL) {
            ERR_raise(ERR_LIB_CMS, ERR_R_ASN1_LIB);
            goto err;
        }
        if ((EVP_CIPHER_get_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER)) {
            memcpy(aparams.iv, piv, ivlen);
            aparams.iv_len = ivlen;
            aparams.tag_len = EVP_CIPHER_CTX_get_tag_length(ctx);
            if (aparams.tag_len <= 0)
                goto err;
        }

        if (evp_cipher_param_to_asn1_ex(ctx, calg->parameter, &aparams) <= 0) {
            ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
            goto err;
        }
        /* If parameter type not set omit parameter */
        if (calg->parameter->type == V_ASN1_UNDEF) {
            ASN1_TYPE_free(calg->parameter);
            calg->parameter = NULL;
        }
    }
    ok = 1;

 err:
    EVP_CIPHER_free(fetched_ciph);
    if (!keep_key || !ok) {
        OPENSSL_clear_free(ec->key, ec->keylen);
        ec->key = NULL;
    }
    OPENSSL_clear_free(tkey, tkeylen);
    if (ok)
        return b;
    BIO_free(b);
    return NULL;
}

int ossl_cms_EncryptedContent_init(CMS_EncryptedContentInfo *ec,
                                   const EVP_CIPHER *cipher,
                                   const unsigned char *key, size_t keylen,
                                   const CMS_CTX *cms_ctx)
{
    ec->cipher = cipher;
    if (key) {
        if ((ec->key = OPENSSL_malloc(keylen)) == NULL)
            return 0;
        memcpy(ec->key, key, keylen);
    }
    ec->keylen = keylen;
    if (cipher != NULL)
        ec->contentType = OBJ_nid2obj(NID_pkcs7_data);
    return 1;
}

int CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph,
                               const unsigned char *key, size_t keylen)
{
    CMS_EncryptedContentInfo *ec;

    if (!key || !keylen) {
        ERR_raise(ERR_LIB_CMS, CMS_R_NO_KEY);
        return 0;
    }
    if (ciph) {
        cms->d.encryptedData = M_ASN1_new_of(CMS_EncryptedData);
        if (!cms->d.encryptedData) {
            ERR_raise(ERR_LIB_CMS, ERR_R_ASN1_LIB);
            return 0;
        }
        cms->contentType = OBJ_nid2obj(NID_pkcs7_encrypted);
        cms->d.encryptedData->version = 0;
    } else if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted) {
        ERR_raise(ERR_LIB_CMS, CMS_R_NOT_ENCRYPTED_DATA);
        return 0;
    }
    ec = cms->d.encryptedData->encryptedContentInfo;
    return ossl_cms_EncryptedContent_init(ec, ciph, key, keylen,
                                          ossl_cms_get0_cmsctx(cms));
}

BIO *ossl_cms_EncryptedData_init_bio(const CMS_ContentInfo *cms)
{
    CMS_EncryptedData *enc = cms->d.encryptedData;
    if (enc->encryptedContentInfo->cipher && enc->unprotectedAttrs)
        enc->version = 2;
    return ossl_cms_EncryptedContent_init_bio(enc->encryptedContentInfo,
                                              ossl_cms_get0_cmsctx(cms));
}
Commit	Line	Data
	1	/*
	2	* Copyright 2008-2021 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	#include "internal/cryptlib.h"
	11	#include <openssl/asn1t.h>
	12	#include <openssl/pem.h>
	13	#include <openssl/x509v3.h>
	14	#include <openssl/err.h>
	15	#include <openssl/cms.h>
	16	#include <openssl/rand.h>
	17	#include "crypto/evp.h"
	18	#include "cms_local.h"
	19
	20	/* CMS EncryptedData Utilities */
	21
	22	/* Return BIO based on EncryptedContentInfo and key */
	23
	24	BIO ossl_cms_EncryptedContent_init_bio(CMS_EncryptedContentInfo ec,
	25	const CMS_CTX *cms_ctx)
	26	{
	27	BIO *b;
	28	EVP_CIPHER_CTX *ctx;
	29	EVP_CIPHER *fetched_ciph = NULL;
	30	const EVP_CIPHER *cipher = NULL;
	31	X509_ALGOR *calg = ec->contentEncryptionAlgorithm;
	32	evp_cipher_aead_asn1_params aparams;
	33	unsigned char iv[EVP_MAX_IV_LENGTH], *piv = NULL;
	34	unsigned char *tkey = NULL;
	35	int len;
	36	int ivlen = 0;
	37	size_t tkeylen = 0;
	38	int ok = 0;
	39	int enc, keep_key = 0;
	40	OSSL_LIB_CTX *libctx = ossl_cms_ctx_get0_libctx(cms_ctx);
	41	const char *propq = ossl_cms_ctx_get0_propq(cms_ctx);
	42
	43	enc = ec->cipher ? 1 : 0;
	44
	45	b = BIO_new(BIO_f_cipher());
	46	if (b == NULL) {
	47	ERR_raise(ERR_LIB_CMS, ERR_R_BIO_LIB);
	48	return NULL;
	49	}
	50
	51	BIO_get_cipher_ctx(b, &ctx);
	52
	53	(void)ERR_set_mark();
	54	if (enc) {
	55	cipher = ec->cipher;
	56	/*
	57	* If not keeping key set cipher to NULL so subsequent calls decrypt.
	58	*/
	59	if (ec->key != NULL)
	60	ec->cipher = NULL;
	61	} else {
	62	cipher = EVP_get_cipherbyobj(calg->algorithm);
	63	}
	64	if (cipher != NULL) {
	65	fetched_ciph = EVP_CIPHER_fetch(libctx, EVP_CIPHER_get0_name(cipher),
	66	propq);
	67	if (fetched_ciph != NULL)
	68	cipher = fetched_ciph;
	69	}
	70	if (cipher == NULL) {
	71	(void)ERR_clear_last_mark();
	72	ERR_raise(ERR_LIB_CMS, CMS_R_UNKNOWN_CIPHER);
	73	goto err;
	74	}
	75	(void)ERR_pop_to_mark();
	76
	77	if (EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, enc) <= 0) {
	78	ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_INITIALISATION_ERROR);
	79	goto err;
	80	}
	81
	82	if (enc) {
	83	calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_get_type(ctx));
	84	if (calg->algorithm == NULL) {
	85	ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_CONTENT_ENCRYPTION_ALGORITHM);
	86	goto err;
	87	}
	88	/* Generate a random IV if we need one */
	89	ivlen = EVP_CIPHER_CTX_get_iv_length(ctx);
	90	if (ivlen < 0) {
	91	ERR_raise(ERR_LIB_CMS, ERR_R_EVP_LIB);
	92	goto err;
	93	}
	94
	95	if (ivlen > 0) {
	96	if (RAND_bytes_ex(libctx, iv, ivlen, 0) <= 0)
	97	goto err;
	98	piv = iv;
	99	}
	100	} else {
	101	if (evp_cipher_asn1_to_param_ex(ctx, calg->parameter, &aparams) <= 0) {
	102	ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
	103	goto err;
	104	}
	105	if ((EVP_CIPHER_get_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER)) {
	106	piv = aparams.iv;
	107	if (ec->taglen > 0
	108	&& EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_AEAD_SET_TAG,
	109	ec->taglen, ec->tag) <= 0) {
	110	ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_AEAD_SET_TAG_ERROR);
	111	goto err;
	112	}
	113	}
	114	}
	115	len = EVP_CIPHER_CTX_get_key_length(ctx);
	116	if (len <= 0)
	117	goto err;
	118	tkeylen = (size_t)len;
	119
	120	/* Generate random session key */
	121	if (!enc \|\| !ec->key) {
	122	tkey = OPENSSL_malloc(tkeylen);
	123	if (tkey == NULL)
	124	goto err;
	125	if (EVP_CIPHER_CTX_rand_key(ctx, tkey) <= 0)
	126	goto err;
	127	}
	128
	129	if (!ec->key) {
	130	ec->key = tkey;
	131	ec->keylen = tkeylen;
	132	tkey = NULL;
	133	if (enc)
	134	keep_key = 1;
	135	else
	136	ERR_clear_error();
	137
	138	}
	139
	140	if (ec->keylen != tkeylen) {
	141	/* If necessary set key length */
	142	if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0) {
	143	/*
	144	* Only reveal failure if debugging so we don't leak information
	145	* which may be useful in MMA.
	146	*/
	147	if (enc \|\| ec->debug) {
	148	ERR_raise(ERR_LIB_CMS, CMS_R_INVALID_KEY_LENGTH);
	149	goto err;
	150	} else {
	151	/* Use random key */
	152	OPENSSL_clear_free(ec->key, ec->keylen);
	153	ec->key = tkey;
	154	ec->keylen = tkeylen;
	155	tkey = NULL;
	156	ERR_clear_error();
	157	}
	158	}
	159	}
	160
	161	if (EVP_CipherInit_ex(ctx, NULL, NULL, ec->key, piv, enc) <= 0) {
	162	ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_INITIALISATION_ERROR);
	163	goto err;
	164	}
	165	if (enc) {
	166	calg->parameter = ASN1_TYPE_new();
	167	if (calg->parameter == NULL) {
	168	ERR_raise(ERR_LIB_CMS, ERR_R_ASN1_LIB);
	169	goto err;
	170	}
	171	if ((EVP_CIPHER_get_flags(cipher) & EVP_CIPH_FLAG_AEAD_CIPHER)) {
	172	memcpy(aparams.iv, piv, ivlen);
	173	aparams.iv_len = ivlen;
	174	aparams.tag_len = EVP_CIPHER_CTX_get_tag_length(ctx);
	175	if (aparams.tag_len <= 0)
	176	goto err;
	177	}
	178
	179	if (evp_cipher_param_to_asn1_ex(ctx, calg->parameter, &aparams) <= 0) {
	180	ERR_raise(ERR_LIB_CMS, CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
	181	goto err;
	182	}
	183	/* If parameter type not set omit parameter */
	184	if (calg->parameter->type == V_ASN1_UNDEF) {
	185	ASN1_TYPE_free(calg->parameter);
	186	calg->parameter = NULL;
	187	}
	188	}
	189	ok = 1;
	190
	191	err:
	192	EVP_CIPHER_free(fetched_ciph);
	193	if (!keep_key \|\| !ok) {
	194	OPENSSL_clear_free(ec->key, ec->keylen);
	195	ec->key = NULL;
	196	}
	197	OPENSSL_clear_free(tkey, tkeylen);
	198	if (ok)
	199	return b;
	200	BIO_free(b);
	201	return NULL;
	202	}
	203
	204	int ossl_cms_EncryptedContent_init(CMS_EncryptedContentInfo *ec,
	205	const EVP_CIPHER *cipher,
	206	const unsigned char *key, size_t keylen,
	207	const CMS_CTX *cms_ctx)
	208	{
	209	ec->cipher = cipher;
	210	if (key) {
	211	if ((ec->key = OPENSSL_malloc(keylen)) == NULL)
	212	return 0;
	213	memcpy(ec->key, key, keylen);
	214	}
	215	ec->keylen = keylen;
	216	if (cipher != NULL)
	217	ec->contentType = OBJ_nid2obj(NID_pkcs7_data);
	218	return 1;
	219	}
	220
	221	int CMS_EncryptedData_set1_key(CMS_ContentInfo cms, const EVP_CIPHER ciph,
	222	const unsigned char *key, size_t keylen)
	223	{
	224	CMS_EncryptedContentInfo *ec;
	225
	226	if (!key \|\| !keylen) {
	227	ERR_raise(ERR_LIB_CMS, CMS_R_NO_KEY);
	228	return 0;
	229	}
	230	if (ciph) {
	231	cms->d.encryptedData = M_ASN1_new_of(CMS_EncryptedData);
	232	if (!cms->d.encryptedData) {
	233	ERR_raise(ERR_LIB_CMS, ERR_R_ASN1_LIB);
	234	return 0;
	235	}
	236	cms->contentType = OBJ_nid2obj(NID_pkcs7_encrypted);
	237	cms->d.encryptedData->version = 0;
	238	} else if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted) {
	239	ERR_raise(ERR_LIB_CMS, CMS_R_NOT_ENCRYPTED_DATA);
	240	return 0;
	241	}
	242	ec = cms->d.encryptedData->encryptedContentInfo;
	243	return ossl_cms_EncryptedContent_init(ec, ciph, key, keylen,
	244	ossl_cms_get0_cmsctx(cms));
	245	}
	246
	247	BIO ossl_cms_EncryptedData_init_bio(const CMS_ContentInfo cms)
	248	{
	249	CMS_EncryptedData *enc = cms->d.encryptedData;
	250	if (enc->encryptedContentInfo->cipher && enc->unprotectedAttrs)
	251	enc->version = 2;
	252	return ossl_cms_EncryptedContent_init_bio(enc->encryptedContentInfo,
	253	ossl_cms_get0_cmsctx(cms));
	254	}