diff --git a/module/icp/core/kcf_prov_tabs.c b/module/icp/core/kcf_prov_tabs.c
index 59ff07133..734bf457c 100644
--- a/module/icp/core/kcf_prov_tabs.c
+++ b/module/icp/core/kcf_prov_tabs.c
@@ -205,7 +205,7 @@ kcf_prov_tab_lookup(crypto_provider_id_t prov_id)
 }
 
 static void
-allocate_ops_v1(const crypto_ops_t *src, crypto_ops_t *dst,
+allocate_ops(const crypto_ops_t *src, crypto_ops_t *dst,
     uint_t *mech_list_count)
 {
 	if (src->co_digest_ops != NULL)
@@ -268,19 +268,11 @@ allocate_ops_v1(const crypto_ops_t *src, crypto_ops_t *dst,
 	if (src->co_ctx_ops != NULL)
 		dst->co_ctx_ops = kmem_alloc(sizeof (crypto_ctx_ops_t),
 		    KM_SLEEP);
-}
 
-static void
-allocate_ops_v2(const crypto_ops_t *src, crypto_ops_t *dst)
-{
 	if (src->co_mech_ops != NULL)
 		dst->co_mech_ops = kmem_alloc(sizeof (crypto_mech_ops_t),
 		    KM_SLEEP);
-}
 
-static void
-allocate_ops_v3(const crypto_ops_t *src, crypto_ops_t *dst)
-{
 	if (src->co_nostore_key_ops != NULL)
 		dst->co_nostore_key_ops =
 		    kmem_alloc(sizeof (crypto_nostore_key_ops_t), KM_SLEEP);
@@ -329,11 +321,7 @@ kcf_alloc_provider_desc(const crypto_provider_info_t *info)
 	crypto_ops_t *opvec = kmem_zalloc(sizeof (crypto_ops_t), KM_SLEEP);
 
 	if (info->pi_provider_type != CRYPTO_LOGICAL_PROVIDER) {
-		allocate_ops_v1(src_ops, opvec, &mech_list_count);
-		if (info->pi_interface_version >= CRYPTO_SPI_VERSION_2)
-			allocate_ops_v2(src_ops, opvec);
-		if (info->pi_interface_version == CRYPTO_SPI_VERSION_3)
-			allocate_ops_v3(src_ops, opvec);
+		allocate_ops(src_ops, opvec, &mech_list_count);
 	}
 	desc->pd_ops_vector = opvec;
 
diff --git a/module/icp/include/sys/crypto/spi.h b/module/icp/include/sys/crypto/spi.h
index 4a4909544..7e265d3a9 100644
--- a/module/icp/include/sys/crypto/spi.h
+++ b/module/icp/include/sys/crypto/spi.h
@@ -487,7 +487,7 @@ typedef struct crypto_nostore_key_ops {
  * supplied by a provider when it registers with the kernel
  * by calling crypto_register_provider(9F).
  */
-typedef struct crypto_ops_v1 {
+typedef struct crypto_ops {
 	const crypto_digest_ops_t			*co_digest_ops;
 	const crypto_cipher_ops_t			*co_cipher_ops;
 	const crypto_mac_ops_t			*co_mac_ops;
@@ -501,42 +501,10 @@ typedef struct crypto_ops_v1 {
 	crypto_key_ops_t			*co_key_ops;
 	crypto_provider_management_ops_t	*co_provider_ops;
 	const crypto_ctx_ops_t			*co_ctx_ops;
-} crypto_ops_v1_t;
-
-typedef struct crypto_ops_v2 {
-	crypto_ops_v1_t				v1_ops;
 	crypto_mech_ops_t			*co_mech_ops;
-} crypto_ops_v2_t;
-
-typedef struct crypto_ops_v3 {
-	crypto_ops_v2_t				v2_ops;
 	crypto_nostore_key_ops_t		*co_nostore_key_ops;
-} crypto_ops_v3_t;
-
-typedef struct crypto_ops {
-	union {
-		crypto_ops_v3_t	cou_v3;
-		crypto_ops_v2_t	cou_v2;
-		crypto_ops_v1_t	cou_v1;
-	} cou;
 } crypto_ops_t;
 
-#define	co_digest_ops			cou.cou_v1.co_digest_ops
-#define	co_cipher_ops			cou.cou_v1.co_cipher_ops
-#define	co_mac_ops			cou.cou_v1.co_mac_ops
-#define	co_sign_ops			cou.cou_v1.co_sign_ops
-#define	co_verify_ops			cou.cou_v1.co_verify_ops
-#define	co_dual_ops			cou.cou_v1.co_dual_ops
-#define	co_dual_cipher_mac_ops		cou.cou_v1.co_dual_cipher_mac_ops
-#define	co_random_ops			cou.cou_v1.co_random_ops
-#define	co_session_ops			cou.cou_v1.co_session_ops
-#define	co_object_ops			cou.cou_v1.co_object_ops
-#define	co_key_ops			cou.cou_v1.co_key_ops
-#define	co_provider_ops			cou.cou_v1.co_provider_ops
-#define	co_ctx_ops			cou.cou_v1.co_ctx_ops
-#define	co_mech_ops			cou.cou_v2.co_mech_ops
-#define	co_nostore_key_ops		cou.cou_v3.co_nostore_key_ops
-
 /*
  * The mechanism info structure crypto_mech_info_t contains a function group
  * bit mask cm_func_group_mask. This field, of type crypto_func_group_t,
@@ -636,8 +604,7 @@ typedef uint_t crypto_kcf_provider_handle_t;
  * register for the same device instance. In this case, the same
  * pi_provider_dev must be specified with a different pi_provider_handle.
  */
-typedef struct crypto_provider_info_v1 {
-	uint_t				pi_interface_version;
+typedef struct crypto_provider_info {
 	char				*pi_provider_description;
 	crypto_provider_type_t		pi_provider_type;
 	crypto_provider_handle_t	pi_provider_handle;
@@ -646,31 +613,9 @@ typedef struct crypto_provider_info_v1 {
 	const crypto_mech_info_t		*pi_mechanisms;
 	uint_t				pi_logical_provider_count;
 	crypto_kcf_provider_handle_t	*pi_logical_providers;
-} crypto_provider_info_v1_t;
-
-typedef struct crypto_provider_info_v2 {
-	crypto_provider_info_v1_t	v1_info;
 	uint_t				pi_flags;
-} crypto_provider_info_v2_t;
-
-typedef struct crypto_provider_info {
-	union {
-		crypto_provider_info_v2_t piu_v2;
-		crypto_provider_info_v1_t piu_v1;
-	} piu;
 } crypto_provider_info_t;
 
-#define	pi_interface_version		piu.piu_v1.pi_interface_version
-#define	pi_provider_description		piu.piu_v1.pi_provider_description
-#define	pi_provider_type		piu.piu_v1.pi_provider_type
-#define	pi_provider_handle		piu.piu_v1.pi_provider_handle
-#define	pi_ops_vector			piu.piu_v1.pi_ops_vector
-#define	pi_mech_list_count		piu.piu_v1.pi_mech_list_count
-#define	pi_mechanisms			piu.piu_v1.pi_mechanisms
-#define	pi_logical_provider_count	piu.piu_v1.pi_logical_provider_count
-#define	pi_logical_providers		piu.piu_v1.pi_logical_providers
-#define	pi_flags			piu.piu_v2.pi_flags
-
 /* hidden providers can only be accessed via a logical provider */
 #define	CRYPTO_HIDE_PROVIDER		0x00000001
 /*
diff --git a/module/icp/io/aes.c b/module/icp/io/aes.c
index 510764e7b..27930ed00 100644
--- a/module/icp/io/aes.c
+++ b/module/icp/io/aes.c
@@ -143,7 +143,7 @@ static const crypto_ctx_ops_t aes_ctx_ops = {
 	.free_context = aes_free_context
 };
 
-static const crypto_ops_t aes_crypto_ops = {{{{{
+static const crypto_ops_t aes_crypto_ops = {
 	NULL,
 	&aes_cipher_ops,
 	&aes_mac_ops,
@@ -157,17 +157,16 @@ static const crypto_ops_t aes_crypto_ops = {{{{{
 	NULL,
 	NULL,
 	&aes_ctx_ops
-}}}}};
+};
 
-static const crypto_provider_info_t aes_prov_info = {{{{
-	CRYPTO_SPI_VERSION_1,
+static const crypto_provider_info_t aes_prov_info = {
 	"AES Software Provider",
 	CRYPTO_SW_PROVIDER,
 	NULL,
 	&aes_crypto_ops,
 	sizeof (aes_mech_info_tab) / sizeof (crypto_mech_info_t),
 	aes_mech_info_tab
-}}}};
+};
 
 static crypto_kcf_provider_handle_t aes_prov_handle = 0;
 static crypto_data_t null_crypto_data = { CRYPTO_DATA_RAW };
diff --git a/module/icp/io/sha2_mod.c b/module/icp/io/sha2_mod.c
index df25d1544..0c7f8a73d 100644
--- a/module/icp/io/sha2_mod.c
+++ b/module/icp/io/sha2_mod.c
@@ -157,7 +157,7 @@ static const crypto_ctx_ops_t sha2_ctx_ops = {
 	.free_context = sha2_free_context
 };
 
-static const crypto_ops_t sha2_crypto_ops = {{{{{
+static const crypto_ops_t sha2_crypto_ops = {
 	&sha2_digest_ops,
 	NULL,
 	&sha2_mac_ops,
@@ -171,17 +171,16 @@ static const crypto_ops_t sha2_crypto_ops = {{{{{
 	NULL,
 	NULL,
 	&sha2_ctx_ops
-}}}}};
+};
 
-static const crypto_provider_info_t sha2_prov_info = {{{{
-	CRYPTO_SPI_VERSION_1,
+static const crypto_provider_info_t sha2_prov_info = {
 	"SHA2 Software Provider",
 	CRYPTO_SW_PROVIDER,
 	NULL,
 	&sha2_crypto_ops,
 	sizeof (sha2_mech_info_tab) / sizeof (crypto_mech_info_t),
 	sha2_mech_info_tab
-}}}};
+};
 
 static crypto_kcf_provider_handle_t sha2_prov_handle = 0;
 
diff --git a/module/icp/io/skein_mod.c b/module/icp/io/skein_mod.c
index b54685873..cceea29d4 100644
--- a/module/icp/io/skein_mod.c
+++ b/module/icp/io/skein_mod.c
@@ -95,7 +95,7 @@ static const crypto_ctx_ops_t skein_ctx_ops = {
 	.free_context = skein_free_context
 };
 
-static const crypto_ops_t skein_crypto_ops = {{{{{
+static const crypto_ops_t skein_crypto_ops = {
 	&skein_digest_ops,
 	NULL,
 	&skein_mac_ops,
@@ -109,17 +109,16 @@ static const crypto_ops_t skein_crypto_ops = {{{{{
 	NULL,
 	NULL,
 	&skein_ctx_ops,
-}}}}};
+};
 
-static const crypto_provider_info_t skein_prov_info = {{{{
-	CRYPTO_SPI_VERSION_1,
+static const crypto_provider_info_t skein_prov_info = {
 	"Skein Software Provider",
 	CRYPTO_SW_PROVIDER,
 	NULL,
 	&skein_crypto_ops,
 	sizeof (skein_mech_info_tab) / sizeof (crypto_mech_info_t),
 	skein_mech_info_tab
-}}}};
+};
 
 static crypto_kcf_provider_handle_t skein_prov_handle = 0;
 
diff --git a/module/icp/spi/kcf_spi.c b/module/icp/spi/kcf_spi.c
index 7e7487912..51670d5b9 100644
--- a/module/icp/spi/kcf_spi.c
+++ b/module/icp/spi/kcf_spi.c
@@ -70,7 +70,7 @@ static const kcf_prov_stats_t kcf_stats_ks_data_template = {
  * persistent.
  */
 static void
-copy_ops_vector_v1(const crypto_ops_t *src_ops, crypto_ops_t *dst_ops)
+copy_ops_vector(const crypto_ops_t *src_ops, crypto_ops_t *dst_ops)
 {
 	KCF_SPI_COPY_OPS(src_ops, dst_ops, co_digest_ops);
 	KCF_SPI_COPY_OPS(src_ops, dst_ops, co_cipher_ops);
@@ -85,17 +85,7 @@ copy_ops_vector_v1(const crypto_ops_t *src_ops, crypto_ops_t *dst_ops)
 	KCF_SPI_COPY_OPS(src_ops, dst_ops, co_key_ops);
 	KCF_SPI_COPY_OPS(src_ops, dst_ops, co_provider_ops);
 	KCF_SPI_COPY_OPS(src_ops, dst_ops, co_ctx_ops);
-}
-
-static void
-copy_ops_vector_v2(const crypto_ops_t *src_ops, crypto_ops_t *dst_ops)
-{
 	KCF_SPI_COPY_OPS(src_ops, dst_ops, co_mech_ops);
-}
-
-static void
-copy_ops_vector_v3(const crypto_ops_t *src_ops, crypto_ops_t *dst_ops)
-{
 	KCF_SPI_COPY_OPS(src_ops, dst_ops, co_nostore_key_ops);
 }
 
@@ -116,9 +106,6 @@ crypto_register_provider(const crypto_provider_info_t *info,
 	kcf_provider_desc_t *prov_desc = NULL;
 	int ret = CRYPTO_ARGUMENTS_BAD;
 
-	if (info->pi_interface_version > CRYPTO_SPI_VERSION_3)
-		return (CRYPTO_VERSION_MISMATCH);
-
 	/*
 	 * Check provider type, must be software, hardware, or logical.
 	 */
@@ -159,14 +146,8 @@ crypto_register_provider(const crypto_provider_info_t *info,
 			goto bail;
 		}
 		crypto_ops_t *pvec = (crypto_ops_t *)prov_desc->pd_ops_vector;
-		copy_ops_vector_v1(info->pi_ops_vector, pvec);
-		if (info->pi_interface_version >= CRYPTO_SPI_VERSION_2) {
-			copy_ops_vector_v2(info->pi_ops_vector, pvec);
-			prov_desc->pd_flags = info->pi_flags;
-		}
-		if (info->pi_interface_version == CRYPTO_SPI_VERSION_3) {
-			copy_ops_vector_v3(info->pi_ops_vector, pvec);
-		}
+		copy_ops_vector(info->pi_ops_vector, pvec);
+		prov_desc->pd_flags = info->pi_flags;
 	}
 
 	/* object_ops and nostore_key_ops are mutually exclusive */