1 /* 2 * QEMU Crypto hmac algorithms (based on glib) 3 * 4 * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD. 5 * 6 * Authors: 7 * Longpeng(Mike) <longpeng2@huawei.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2 or 10 * (at your option) any later version. See the COPYING file in the 11 * top-level directory. 12 * 13 */ 14 15 #include "qemu/osdep.h" 16 #include "qapi/error.h" 17 #include "crypto/hmac.h" 18 #include "hmacpriv.h" 19 20 static int qcrypto_hmac_alg_map[QCRYPTO_HASH_ALG__MAX] = { 21 [QCRYPTO_HASH_ALG_MD5] = G_CHECKSUM_MD5, 22 [QCRYPTO_HASH_ALG_SHA1] = G_CHECKSUM_SHA1, 23 [QCRYPTO_HASH_ALG_SHA256] = G_CHECKSUM_SHA256, 24 [QCRYPTO_HASH_ALG_SHA512] = G_CHECKSUM_SHA512, 25 [QCRYPTO_HASH_ALG_SHA224] = -1, 26 [QCRYPTO_HASH_ALG_SHA384] = -1, 27 [QCRYPTO_HASH_ALG_RIPEMD160] = -1, 28 }; 29 30 typedef struct QCryptoHmacGlib QCryptoHmacGlib; 31 struct QCryptoHmacGlib { 32 GHmac *ghmac; 33 }; 34 35 bool qcrypto_hmac_supports(QCryptoHashAlgorithm alg) 36 { 37 if (alg < G_N_ELEMENTS(qcrypto_hmac_alg_map) && 38 qcrypto_hmac_alg_map[alg] != -1) { 39 return true; 40 } 41 42 return false; 43 } 44 45 void *qcrypto_hmac_ctx_new(QCryptoHashAlgorithm alg, 46 const uint8_t *key, size_t nkey, 47 Error **errp) 48 { 49 QCryptoHmacGlib *ctx; 50 51 if (!qcrypto_hmac_supports(alg)) { 52 error_setg(errp, "Unsupported hmac algorithm %s", 53 QCryptoHashAlgorithm_str(alg)); 54 return NULL; 55 } 56 57 ctx = g_new0(QCryptoHmacGlib, 1); 58 59 ctx->ghmac = g_hmac_new(qcrypto_hmac_alg_map[alg], 60 (const uint8_t *)key, nkey); 61 if (!ctx->ghmac) { 62 error_setg(errp, "Cannot initialize hmac and set key"); 63 goto error; 64 } 65 66 return ctx; 67 68 error: 69 g_free(ctx); 70 return NULL; 71 } 72 73 static void 74 qcrypto_glib_hmac_ctx_free(QCryptoHmac *hmac) 75 { 76 QCryptoHmacGlib *ctx; 77 78 ctx = hmac->opaque; 79 g_hmac_unref(ctx->ghmac); 80 81 g_free(ctx); 82 } 83 84 static int 85 qcrypto_glib_hmac_bytesv(QCryptoHmac *hmac, 86 const struct iovec *iov, 87 size_t niov, 88 uint8_t **result, 89 size_t *resultlen, 90 Error **errp) 91 { 92 QCryptoHmacGlib *ctx; 93 int i, ret; 94 95 ctx = hmac->opaque; 96 97 for (i = 0; i < niov; i++) { 98 g_hmac_update(ctx->ghmac, iov[i].iov_base, iov[i].iov_len); 99 } 100 101 ret = g_checksum_type_get_length(qcrypto_hmac_alg_map[hmac->alg]); 102 if (ret < 0) { 103 error_setg(errp, "Unable to get hmac length"); 104 return -1; 105 } 106 107 if (*resultlen == 0) { 108 *resultlen = ret; 109 *result = g_new0(uint8_t, *resultlen); 110 } else if (*resultlen != ret) { 111 error_setg(errp, "Result buffer size %zu is smaller than hmac %d", 112 *resultlen, ret); 113 return -1; 114 } 115 116 g_hmac_get_digest(ctx->ghmac, *result, resultlen); 117 118 return 0; 119 } 120 121 QCryptoHmacDriver qcrypto_hmac_lib_driver = { 122 .hmac_bytesv = qcrypto_glib_hmac_bytesv, 123 .hmac_free = qcrypto_glib_hmac_ctx_free, 124 }; 125