[PATCH v6 07/28] hash: integrate hash on mbedtls

[Raymond Mao]

Integrate common/hash.c on the hash shim layer so that hash APIs
from mbedtls can be leveraged by boot/image and efi_loader.

Signed-off-by: Raymond Mao <raymond.mao at linaro.org>
---
Changes in v2
- Use the original head files instead of creating new ones.
Changes in v3
- Add handle checkers for malloc.
Changes in v4
- None.
Changes in v5
- Add __maybe_unused to solve linker errors in some platforms.
- replace malloc with calloc.
Changes in v6
- None.

 common/hash.c | 146 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 146 insertions(+)

diff --git a/common/hash.c b/common/hash.c
index ac63803fed9..d25fc4854c7 100644
--- a/common/hash.c
+++ b/common/hash.c
@@ -35,6 +35,144 @@
 #include <u-boot/sha512.h>
 #include <u-boot/md5.h>
 
+#if CONFIG_IS_ENABLED(MBEDTLS_LIB_CRYPTO)
+
+static int __maybe_unused hash_init_sha1(struct hash_algo *algo, void **ctxp)
+{
+	int ret;
+	mbedtls_sha1_context *ctx = calloc(1, sizeof(*ctx));
+
+	if (!ctx)
+		return -ENOMEM;
+
+	mbedtls_sha1_init(ctx);
+	ret = mbedtls_sha1_starts(ctx);
+	if (!ret) {
+		*ctxp = ctx;
+	} else {
+		mbedtls_sha1_free(ctx);
+		free(ctx);
+	}
+
+	return ret;
+}
+
+static int __maybe_unused hash_update_sha1(struct hash_algo *algo, void *ctx,
+					   const void *buf, unsigned int size,
+					   int is_last)
+{
+	return mbedtls_sha1_update((mbedtls_sha1_context *)ctx, buf, size);
+}
+
+static int __maybe_unused
+hash_finish_sha1(struct hash_algo *algo, void *ctx, void *dest_buf, int size)
+{
+	int ret;
+
+	if (size < algo->digest_size)
+		return -1;
+
+	ret = mbedtls_sha1_finish((mbedtls_sha1_context *)ctx, dest_buf);
+	if (!ret) {
+		mbedtls_sha1_free((mbedtls_sha1_context *)ctx);
+		free(ctx);
+	}
+
+	return ret;
+}
+
+static int __maybe_unused hash_init_sha256(struct hash_algo *algo, void **ctxp)
+{
+	int ret;
+	int is224 = algo->digest_size == SHA224_SUM_LEN ? 1 : 0;
+	mbedtls_sha256_context *ctx = calloc(1, sizeof(*ctx));
+
+	if (!ctx)
+		return -ENOMEM;
+
+	mbedtls_sha256_init(ctx);
+	ret = mbedtls_sha256_starts(ctx, is224);
+	if (!ret) {
+		*ctxp = ctx;
+	} else {
+		mbedtls_sha256_free(ctx);
+		free(ctx);
+	}
+
+	return ret;
+}
+
+static int __maybe_unused hash_update_sha256(struct hash_algo *algo, void *ctx,
+					     const void *buf, uint size,
+					     int is_last)
+{
+	return mbedtls_sha256_update((mbedtls_sha256_context *)ctx, buf, size);
+}
+
+static int __maybe_unused
+hash_finish_sha256(struct hash_algo *algo, void *ctx, void *dest_buf, int size)
+{
+	int ret;
+
+	if (size < algo->digest_size)
+		return -1;
+
+	ret = mbedtls_sha256_finish((mbedtls_sha256_context *)ctx, dest_buf);
+	if (!ret) {
+		mbedtls_sha256_free((mbedtls_sha256_context *)ctx);
+		free(ctx);
+	}
+
+	return ret;
+}
+
+static int __maybe_unused hash_init_sha512(struct hash_algo *algo, void **ctxp)
+{
+	int ret;
+	int is384 = algo->digest_size == SHA384_SUM_LEN ? 1 : 0;
+	mbedtls_sha512_context *ctx = calloc(1, sizeof(*ctx));
+
+	if (!ctx)
+		return -ENOMEM;
+
+	mbedtls_sha512_init(ctx);
+	ret = mbedtls_sha512_starts(ctx, is384);
+	if (!ret) {
+		*ctxp = ctx;
+	} else {
+		mbedtls_sha512_free(ctx);
+		free(ctx);
+	}
+
+	return ret;
+}
+
+static int __maybe_unused hash_update_sha512(struct hash_algo *algo, void *ctx,
+					     const void *buf, uint size,
+					     int is_last)
+{
+	return mbedtls_sha512_update((mbedtls_sha512_context *)ctx, buf, size);
+}
+
+static int __maybe_unused
+hash_finish_sha512(struct hash_algo *algo, void *ctx, void *dest_buf, int size)
+{
+	int ret;
+
+	if (size < algo->digest_size)
+		return -1;
+
+	ret = mbedtls_sha512_finish((mbedtls_sha512_context *)ctx, dest_buf);
+	if (!ret) {
+		mbedtls_sha512_free((mbedtls_sha512_context *)ctx);
+		free(ctx);
+	}
+
+	return ret;
+}
+
+#else /* CONFIG_IS_ENABLED(MBEDTLS_LIB_CRYPTO) */
+
 static int __maybe_unused hash_init_sha1(struct hash_algo *algo, void **ctxp)
 {
 	sha1_context *ctx = malloc(sizeof(sha1_context));
@@ -143,6 +281,8 @@ static int __maybe_unused hash_finish_sha512(struct hash_algo *algo, void *ctx,
 	return 0;
 }
 
+#endif /* CONFIG_IS_ENABLED(MBEDTLS_LIB_CRYPTO) */
+
 static int hash_init_crc16_ccitt(struct hash_algo *algo, void **ctxp)
 {
 	uint16_t *ctx = malloc(sizeof(uint16_t));
@@ -267,10 +407,16 @@ static struct hash_algo hash_algo[] = {
 		.hash_init	= hw_sha_init,
 		.hash_update	= hw_sha_update,
 		.hash_finish	= hw_sha_finish,
+#else
+#if CONFIG_IS_ENABLED(MBEDTLS_LIB_CRYPTO)
+		.hash_init	= hash_init_sha512,
+		.hash_update	= hash_update_sha512,
+		.hash_finish	= hash_finish_sha512,
 #else
 		.hash_init	= hash_init_sha384,
 		.hash_update	= hash_update_sha384,
 		.hash_finish	= hash_finish_sha384,
+#endif
 #endif
 	},
 #endif
-- 
2.25.1