Re: [PATCH v6 6/9] crypto: Implement RSA algorithm by gcrypt

["Daniel P. Berrangé" <berrange@redhat.com>]

On Sat, May 14, 2022 at 08:55:01AM +0800, zhenwei pi wrote:
> From: Lei He <helei.sig11@bytedance.com>
> 
> Added gcryt implementation of RSA algorithm, RSA algorithm
> implemented by gcrypt has a higher priority than nettle because
> it supports raw padding.
> 
> Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
> Signed-off-by: lei he <helei.sig11@bytedance.com>
> ---
>  crypto/akcipher-gcrypt.c.inc | 597 +++++++++++++++++++++++++++++++++++
>  crypto/akcipher.c            |   4 +-
>  2 files changed, 600 insertions(+), 1 deletion(-)
>  create mode 100644 crypto/akcipher-gcrypt.c.inc
> 
> diff --git a/crypto/akcipher-gcrypt.c.inc b/crypto/akcipher-gcrypt.c.inc
> new file mode 100644
> index 0000000000..6c5daa301e
> --- /dev/null
> +++ b/crypto/akcipher-gcrypt.c.inc
> @@ -0,0 +1,597 @@
> +/*
> + * QEMU Crypto akcipher algorithms
> + *
> + * Copyright (c) 2022 Bytedance
> + * Author: lei he <helei.sig11@bytedance.com>
> + *
> + * This library is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU Lesser General Public
> + * License as published by the Free Software Foundation; either
> + * version 2.1 of the License, or (at your option) any later version.
> + *
> + * This library is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * Lesser General Public License for more details.
> + *
> + * You should have received a copy of the GNU Lesser General Public
> + * License along with this library; if not, see <http://www.gnu.org/licenses/>.
> + *
> + */
> +
> +#include <gcrypt.h>
> +static QCryptoGcryptRSA *qcrypto_gcrypt_rsa_new(
> +    const QCryptoAkCipherOptionsRSA *opt,
> +    QCryptoAkCipherKeyType type,
> +    const uint8_t *key, size_t keylen,
> +    Error **errp)
> +{
> +    QCryptoGcryptRSA *rsa = g_new0(QCryptoGcryptRSA, 1);
> +    rsa->padding_alg = opt->padding_alg;
> +    rsa->hash_alg = opt->hash_alg;
> +    rsa->akcipher.driver = &gcrypt_rsa;
> +
> +    switch (type) {
> +    case QCRYPTO_AKCIPHER_KEY_TYPE_PRIVATE:
> +        if (qcrypto_gcrypt_parse_rsa_private_key(rsa, key, keylen, errp) != 0) {
> +            error_setg(errp, "Failed to parse rsa private key");

Not need now, since qcrypto_gcrypt_parse_rsa_private_key reports the
real error message.

> +            goto error;
> +        }
> +        break;
> +
> +    case QCRYPTO_AKCIPHER_KEY_TYPE_PUBLIC:
> +        if (qcrypto_gcrypt_parse_rsa_public_key(rsa, key, keylen, errp) != 0) {
> +            error_setg(errp, "Failed to parse rsa public rsa key");

Likewise not needed.

> +            goto error;
> +        }
> +        break;
> +
> +    default:
> +        error_setg(errp, "Unknown akcipher key type %d", type);
> +        goto error;
> +    }
> +
> +    return rsa;
> +
> +error:
> +    qcrypto_gcrypt_rsa_free((QCryptoAkCipher *)rsa);
> +    return NULL;
> +}

With regards,
Daniel
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