From a1de4680fbf53b0feffd27baca3c6b4caf0c6c45 Mon Sep 17 00:00:00 2001 From: Pauli Date: Sat, 7 Sep 2019 10:50:14 +1000 Subject: [PATCH] Use common digest getter for SSH KDF Reviewed-by: Richard Levitte (Merged from https://github.com/openssl/openssl/pull/9770) --- providers/default/kdfs/sshkdf.c | 35 +++++++++------------------------ 1 file changed, 9 insertions(+), 26 deletions(-) diff --git a/providers/default/kdfs/sshkdf.c b/providers/default/kdfs/sshkdf.c index da59aaf861..2db5397294 100644 --- a/providers/default/kdfs/sshkdf.c +++ b/providers/default/kdfs/sshkdf.c @@ -19,6 +19,7 @@ #include "internal/provider_ctx.h" #include "internal/providercommonerr.h" #include "internal/provider_algs.h" +# include "internal/provider_util.h" /* See RFC 4253, Section 7.2 */ static OSSL_OP_kdf_newctx_fn kdf_sshkdf_new; @@ -38,7 +39,7 @@ static int SSHKDF(const EVP_MD *evp_md, typedef struct { void *provctx; - EVP_MD *md; + PROV_DIGEST digest; unsigned char *key; /* K */ size_t key_len; unsigned char *xcghash; /* H */ @@ -70,7 +71,7 @@ static void kdf_sshkdf_reset(void *vctx) { KDF_SSHKDF *ctx = (KDF_SSHKDF *)vctx; - EVP_MD_meth_free(ctx->md); + ossl_prov_digest_reset(&ctx->digest); OPENSSL_clear_free(ctx->key, ctx->key_len); OPENSSL_clear_free(ctx->xcghash, ctx->xcghash_len); OPENSSL_clear_free(ctx->session_id, ctx->session_id_len); @@ -89,8 +90,9 @@ static int kdf_sshkdf_derive(void *vctx, unsigned char *key, size_t keylen) { KDF_SSHKDF *ctx = (KDF_SSHKDF *)vctx; + const EVP_MD *md = ossl_prov_digest_md(&ctx->digest); - if (ctx->md == NULL) { + if (md == NULL) { ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_MESSAGE_DIGEST); return 0; } @@ -110,7 +112,7 @@ static int kdf_sshkdf_derive(void *vctx, unsigned char *key, ERR_raise(ERR_LIB_PROV, PROV_R_MISSING_TYPE); return 0; } - return SSHKDF(ctx->md, ctx->key, ctx->key_len, + return SSHKDF(md, ctx->key, ctx->key_len, ctx->xcghash, ctx->xcghash_len, ctx->session_id, ctx->session_id_len, ctx->type, key, keylen); @@ -120,30 +122,11 @@ static int kdf_sshkdf_set_ctx_params(void *vctx, const OSSL_PARAM params[]) { const OSSL_PARAM *p; KDF_SSHKDF *ctx = vctx; - EVP_MD *md; + OPENSSL_CTX *provctx = PROV_LIBRARY_CONTEXT_OF(ctx->provctx); int t; - const char *properties = NULL; - /* Grab search properties, this should be before the digest lookup */ - if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_PROPERTIES)) - != NULL) { - if (p->data_type != OSSL_PARAM_UTF8_STRING) - return 0; - properties = p->data; - } - /* Handle aliasing of digest parameter names */ - if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_DIGEST)) != NULL) { - if (p->data_type != OSSL_PARAM_UTF8_STRING) - return 0; - md = EVP_MD_fetch(PROV_LIBRARY_CONTEXT_OF(ctx->provctx), p->data, - properties); - if (md == NULL) { - ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DIGEST); - return 0; - } - EVP_MD_meth_free(ctx->md); - ctx->md = md; - } + if (!ossl_prov_digest_load_from_params(&ctx->digest, params, provctx)) + return 0; if ((p = OSSL_PARAM_locate_const(params, OSSL_KDF_PARAM_KEY)) != NULL) if (!sshkdf_set_membuf(&ctx->key, &ctx->key_len, p)) -- 2.39.2