static int kek_unwrap_key(unsigned char *out, size_t *outlen,
                          const unsigned char *in, size_t inlen,
                          EVP_CIPHER_CTX *ctx)
{
    size_t blocklen = EVP_CIPHER_CTX_block_size(ctx);
    unsigned char *tmp;
    int outl, rv = 0;
    if (inlen < 2 * blocklen) {
        return 0;
    }
    if (inlen % blocklen) {
        return 0;
    }
    tmp = OPENSSL_malloc(inlen);
    if (tmp == NULL)
        return 0;
    if (!EVP_DecryptUpdate(ctx, tmp + inlen - 2 * blocklen, &outl,
                           in + inlen - 2 * blocklen, blocklen * 2)
        || !EVP_DecryptUpdate(ctx, tmp, &outl,
                              tmp + inlen - blocklen, blocklen)
        || !EVP_DecryptUpdate(ctx, tmp, &outl, in, inlen - blocklen)
        || !EVP_DecryptInit_ex(ctx, NULL, NULL, NULL, NULL)
        || !EVP_DecryptUpdate(ctx, tmp, &outl, tmp, inlen))
        goto err;
    if (((tmp[1] ^ tmp[4]) & (tmp[2] ^ tmp[5]) & (tmp[3] ^ tmp[6])) != 0xff) {
        goto err;
    }
    if (inlen < (size_t)(tmp[0] - 4)) {
        goto err;
    }
    *outlen = (size_t)tmp[0];
    memcpy(out, tmp + 4, *outlen);
    rv = 1;
 err:
    OPENSSL_clear_free(tmp, inlen);
    return rv;
}
['int CMS_decrypt_set1_password(CMS_ContentInfo *cms,\n                              unsigned char *pass, ossl_ssize_t passlen)\n{\n    STACK_OF(CMS_RecipientInfo) *ris;\n    CMS_RecipientInfo *ri;\n    int i, r;\n    ris = CMS_get0_RecipientInfos(cms);\n    for (i = 0; i < sk_CMS_RecipientInfo_num(ris); i++) {\n        ri = sk_CMS_RecipientInfo_value(ris, i);\n        if (CMS_RecipientInfo_type(ri) != CMS_RECIPINFO_PASS)\n            continue;\n        CMS_RecipientInfo_set0_password(ri, pass, passlen);\n        r = CMS_RecipientInfo_decrypt(cms, ri);\n        CMS_RecipientInfo_set0_password(ri, NULL, 0);\n        if (r > 0)\n            return 1;\n    }\n    CMSerr(CMS_F_CMS_DECRYPT_SET1_PASSWORD, CMS_R_NO_MATCHING_RECIPIENT);\n    return 0;\n}', 'int CMS_RecipientInfo_decrypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri)\n{\n    switch (ri->type) {\n    case CMS_RECIPINFO_TRANS:\n        return cms_RecipientInfo_ktri_decrypt(cms, ri);\n    case CMS_RECIPINFO_KEK:\n        return cms_RecipientInfo_kekri_decrypt(cms, ri);\n    case CMS_RECIPINFO_PASS:\n        return cms_RecipientInfo_pwri_crypt(cms, ri, 0);\n    default:\n        CMSerr(CMS_F_CMS_RECIPIENTINFO_DECRYPT,\n               CMS_R_UNSUPPORTED_RECPIENTINFO_TYPE);\n        return 0;\n    }\n}', 'int cms_RecipientInfo_pwri_crypt(CMS_ContentInfo *cms, CMS_RecipientInfo *ri,\n                                 int en_de)\n{\n    CMS_EncryptedContentInfo *ec;\n    CMS_PasswordRecipientInfo *pwri;\n    int r = 0;\n    X509_ALGOR *algtmp, *kekalg = NULL;\n    EVP_CIPHER_CTX *kekctx;\n    const EVP_CIPHER *kekcipher;\n    unsigned char *key = NULL;\n    size_t keylen;\n    ec = cms->d.envelopedData->encryptedContentInfo;\n    pwri = ri->d.pwri;\n    kekctx = EVP_CIPHER_CTX_new();\n    if (!pwri->pass) {\n        CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, CMS_R_NO_PASSWORD);\n        return 0;\n    }\n    algtmp = pwri->keyEncryptionAlgorithm;\n    if (!algtmp || OBJ_obj2nid(algtmp->algorithm) != NID_id_alg_PWRI_KEK) {\n        CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,\n               CMS_R_UNSUPPORTED_KEY_ENCRYPTION_ALGORITHM);\n        return 0;\n    }\n    kekalg = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(X509_ALGOR),\n                                       algtmp->parameter);\n    if (kekalg == NULL) {\n        CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,\n               CMS_R_INVALID_KEY_ENCRYPTION_PARAMETER);\n        return 0;\n    }\n    kekcipher = EVP_get_cipherbyobj(kekalg->algorithm);\n    if (!kekcipher) {\n        CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, CMS_R_UNKNOWN_CIPHER);\n        goto err;\n    }\n    if (!EVP_CipherInit_ex(kekctx, kekcipher, NULL, NULL, NULL, en_de))\n        goto err;\n    EVP_CIPHER_CTX_set_padding(kekctx, 0);\n    if (EVP_CIPHER_asn1_to_param(kekctx, kekalg->parameter) < 0) {\n        CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT,\n               CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);\n        goto err;\n    }\n    algtmp = pwri->keyDerivationAlgorithm;\n    if (EVP_PBE_CipherInit(algtmp->algorithm,\n                           (char *)pwri->pass, pwri->passlen,\n                           algtmp->parameter, kekctx, en_de) < 0) {\n        CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, ERR_R_EVP_LIB);\n        goto err;\n    }\n    if (en_de) {\n        if (!kek_wrap_key(NULL, &keylen, ec->key, ec->keylen, kekctx))\n            goto err;\n        key = OPENSSL_malloc(keylen);\n        if (key == NULL)\n            goto err;\n        if (!kek_wrap_key(key, &keylen, ec->key, ec->keylen, kekctx))\n            goto err;\n        pwri->encryptedKey->data = key;\n        pwri->encryptedKey->length = keylen;\n    } else {\n        key = OPENSSL_malloc(pwri->encryptedKey->length);\n        if (key == NULL) {\n            CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, ERR_R_MALLOC_FAILURE);\n            goto err;\n        }\n        if (!kek_unwrap_key(key, &keylen,\n                            pwri->encryptedKey->data,\n                            pwri->encryptedKey->length, kekctx)) {\n            CMSerr(CMS_F_CMS_RECIPIENTINFO_PWRI_CRYPT, CMS_R_UNWRAP_FAILURE);\n            goto err;\n        }\n        ec->key = key;\n        ec->keylen = keylen;\n    }\n    r = 1;\n err:\n    EVP_CIPHER_CTX_free(kekctx);\n    if (!r)\n        OPENSSL_free(key);\n    X509_ALGOR_free(kekalg);\n    return r;\n}', 'static int kek_unwrap_key(unsigned char *out, size_t *outlen,\n                          const unsigned char *in, size_t inlen,\n                          EVP_CIPHER_CTX *ctx)\n{\n    size_t blocklen = EVP_CIPHER_CTX_block_size(ctx);\n    unsigned char *tmp;\n    int outl, rv = 0;\n    if (inlen < 2 * blocklen) {\n        return 0;\n    }\n    if (inlen % blocklen) {\n        return 0;\n    }\n    tmp = OPENSSL_malloc(inlen);\n    if (tmp == NULL)\n        return 0;\n    if (!EVP_DecryptUpdate(ctx, tmp + inlen - 2 * blocklen, &outl,\n                           in + inlen - 2 * blocklen, blocklen * 2)\n        || !EVP_DecryptUpdate(ctx, tmp, &outl,\n                              tmp + inlen - blocklen, blocklen)\n        || !EVP_DecryptUpdate(ctx, tmp, &outl, in, inlen - blocklen)\n        || !EVP_DecryptInit_ex(ctx, NULL, NULL, NULL, NULL)\n        || !EVP_DecryptUpdate(ctx, tmp, &outl, tmp, inlen))\n        goto err;\n    if (((tmp[1] ^ tmp[4]) & (tmp[2] ^ tmp[5]) & (tmp[3] ^ tmp[6])) != 0xff) {\n        goto err;\n    }\n    if (inlen < (size_t)(tmp[0] - 4)) {\n        goto err;\n    }\n    *outlen = (size_t)tmp[0];\n    memcpy(out, tmp + 4, *outlen);\n    rv = 1;\n err:\n    OPENSSL_clear_free(tmp, inlen);\n    return rv;\n}', 'void *CRYPTO_malloc(size_t num, const char *file, int line)\n{\n    void *ret = NULL;\n    if (num <= 0)\n        return NULL;\n    allow_customize = 0;\n#ifndef OPENSSL_NO_CRYPTO_MDEBUG\n    if (call_malloc_debug) {\n        CRYPTO_mem_debug_malloc(NULL, num, 0, file, line);\n        ret = malloc(num);\n        CRYPTO_mem_debug_malloc(ret, num, 1, file, line);\n    } else {\n        ret = malloc(num);\n    }\n#else\n    (void)file;\n    (void)line;\n    ret = malloc(num);\n#endif\n#ifndef OPENSSL_CPUID_OBJ\n    if (ret && (num > 2048)) {\n        extern unsigned char cleanse_ctr;\n        ((unsigned char *)ret)[0] = cleanse_ctr;\n    }\n#endif\n    return ret;\n}']