diff --git a/sys/conf/files.arm b/sys/conf/files.arm
--- a/sys/conf/files.arm
+++ b/sys/conf/files.arm
@@ -135,10 +135,12 @@
 libkern/umoddi3.c		standard
 
 crypto/openssl/ossl_arm.c		optional ossl
+crypto/openssl/ossl_aes_gcm.c		optional ossl
 crypto/openssl/arm/aes-armv4.S		optional ossl
 crypto/openssl/arm/bsaes-armv7.S	optional ossl	\
 	compile-with	"${CC} -D__KERNEL__ -c ${CFLAGS:N-mgeneral-regs-only} ${WERROR} ${.IMPSRC}"
 crypto/openssl/arm/chacha-armv4.S	optional ossl
+crypto/openssl/arm/ghash-armv4.S	optional ossl
 crypto/openssl/arm/poly1305-armv4.S	optional ossl
 crypto/openssl/arm/sha1-armv4-large.S	optional ossl
 crypto/openssl/arm/sha256-armv4.S	optional ossl
diff --git a/sys/crypto/openssl/arm/ossl_aes_gcm.c b/sys/crypto/openssl/arm/ossl_aes_gcm.c
new file mode 100644
--- /dev/null
+++ b/sys/crypto/openssl/arm/ossl_aes_gcm.c
@@ -0,0 +1,357 @@
+/*
+ * Copyright 2010-2022 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License 2.0 (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include <sys/types.h>
+#include <sys/endian.h>
+#include <sys/systm.h>
+
+#include <crypto/openssl/ossl.h>
+#include <crypto/openssl/ossl_arm.h>
+#include <crypto/openssl/ossl_aes_gcm.h>
+#include <crypto/openssl/ossl_cipher.h>
+#include <crypto/openssl/arm/arm_arch.h>
+
+#include <opencrypto/cryptodev.h>
+
+_Static_assert(
+    sizeof(struct ossl_gcm_context) <= sizeof(struct ossl_cipher_context),
+    "ossl_gcm_context too large");
+
+void AES_encrypt(const void *in, void *out, const void *ks);
+void AES_set_encrypt_key(const void *key, int keylen, void *ks);
+
+void gcm_init_neon(__uint128_t Htable[16], const uint64_t Xi[2]);
+void gcm_gmult_neon(uint64_t Xi[2], const __uint128_t Htable[16]);
+void gcm_ghash_neon(uint64_t Xi[2], const __uint128_t Htable[16],
+    const void *in, size_t len);
+
+void bsaes_ctr32_encrypt_blocks(const unsigned char *in, unsigned char *out,
+    size_t blocks, void *ks, const unsigned char *iv);
+
+static void
+gcm_init(struct ossl_gcm_context *ctx, const void *key, size_t keylen)
+{
+	memset(&ctx->gcm, 0, sizeof(ctx->gcm));
+	memset(&ctx->aes_ks, 0, sizeof(ctx->aes_ks));
+
+	AES_set_encrypt_key(key, keylen, &ctx->aes_ks);
+	AES_encrypt(ctx->gcm.H.c, ctx->gcm.H.c, &ctx->aes_ks);
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+	ctx->gcm.H.u[0] = bswap64(ctx->gcm.H.u[0]);
+	ctx->gcm.H.u[1] = bswap64(ctx->gcm.H.u[1]);
+#endif
+
+	gcm_init_neon(ctx->gcm.Htable, ctx->gcm.H.u);
+}
+
+static void
+gcm_setiv(struct ossl_gcm_context *ctx, const unsigned char *iv, size_t len)
+{
+	uint32_t ctr;
+
+	KASSERT(len == AES_GCM_IV_LEN,
+	    ("%s: invalid IV length %zu", __func__, len));
+
+	ctx->gcm.len.u[0] = 0;
+	ctx->gcm.len.u[1] = 0;
+	ctx->gcm.ares = ctx->gcm.mres = 0;
+
+	memcpy(ctx->gcm.Yi.c, iv, len);
+	ctx->gcm.Yi.c[12] = 0;
+	ctx->gcm.Yi.c[13] = 0;
+	ctx->gcm.Yi.c[14] = 0;
+	ctx->gcm.Yi.c[15] = 1;
+	ctr = 1;
+
+	ctx->gcm.Xi.u[0] = 0;
+	ctx->gcm.Xi.u[1] = 0;
+
+	AES_encrypt(ctx->gcm.Yi.c, ctx->gcm.EK0.c, &ctx->aes_ks);
+	ctr++;
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+	ctx->gcm.Yi.d[3] = bswap32(ctr);
+#else
+	ctx->gcm.Yi.d[3] = ctr;
+#endif
+}
+
+static int
+gcm_finish(struct ossl_gcm_context *ctx, const unsigned char *tag, size_t len)
+{
+	uint64_t alen = ctx->gcm.len.u[0] << 3;
+	uint64_t clen = ctx->gcm.len.u[1] << 3;
+
+	if (ctx->gcm.mres || ctx->gcm.ares)
+		gcm_gmult_neon(ctx->gcm.Xi.u, ctx->gcm.Htable);
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+	alen = bswap64(alen);
+	clen = bswap64(clen);
+#endif
+
+	ctx->gcm.Xi.u[0] ^= alen;
+	ctx->gcm.Xi.u[1] ^= clen;
+	gcm_gmult_neon(ctx->gcm.Xi.u, ctx->gcm.Htable);
+
+	ctx->gcm.Xi.u[0] ^= ctx->gcm.EK0.u[0];
+	ctx->gcm.Xi.u[1] ^= ctx->gcm.EK0.u[1];
+
+	if (tag != NULL)
+		return timingsafe_bcmp(ctx->gcm.Xi.c, tag, len);
+	return 0;
+}
+
+static int
+gcm_aad(struct ossl_gcm_context *ctx, const unsigned char *aad, size_t len)
+{
+	size_t i;
+	unsigned int n;
+	uint64_t alen = ctx->gcm.len.u[0];
+
+	if (ctx->gcm.len.u[1])
+		return -2;
+
+	alen += len;
+	if (alen > ((uint64_t)1 << 61) || (sizeof(len) == 8 && alen < len))
+		return -1;
+	ctx->gcm.len.u[0] = alen;
+
+	n = ctx->gcm.ares;
+	if (n) {
+		while (n && len) {
+			ctx->gcm.Xi.c[n] ^= *(aad++);
+			--len;
+			n = (n + 1) % 16;
+		}
+		if (n == 0)
+			gcm_gmult_neon(ctx->gcm.Xi.u, ctx->gcm.Htable);
+		else {
+			ctx->gcm.ares = n;
+			return 0;
+		}
+	}
+	if ((i = (len & (size_t)-AES_BLOCK_LEN))) {
+		gcm_ghash_neon(ctx->gcm.Xi.u, ctx->gcm.Htable, aad, i);
+		aad += i;
+		len -= i;
+	}
+	if (len) {
+		n = (unsigned int)len;
+		for (i = 0; i < len; ++i)
+			ctx->gcm.Xi.c[i] ^= aad[i];
+	}
+
+	ctx->gcm.ares = n;
+	return 0;
+}
+
+static int
+gcm_encrypt(struct ossl_gcm_context *ctx, const unsigned char *in,
+    unsigned char *out, size_t len)
+{
+	struct bsaes_key bsks;
+	unsigned int n, ctr, mres;
+	size_t i;
+	uint64_t mlen = ctx->gcm.len.u[1];
+
+	mlen += len;
+	if (mlen > (((uint64_t)1 << 36) - 32) ||
+	    (sizeof(len) == 8 && mlen < len))
+		return -1;
+	ctx->gcm.len.u[1] = mlen;
+
+	mres = ctx->gcm.mres;
+
+	if (ctx->gcm.ares) {
+		/* First call to encrypt finalizes GHASH(AAD) */
+		gcm_gmult_neon(ctx->gcm.Xi.u, ctx->gcm.Htable);
+		ctx->gcm.ares = 0;
+	}
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+	ctr = bswap32(ctx->gcm.Yi.d[3]);
+#else
+	ctr = ctx->gcm.Yi.d[3];
+#endif
+
+	n = mres % 16;
+	if (n) {
+		while (n && len) {
+			ctx->gcm.Xi.c[n] ^= *(out++) = *(in++) ^ ctx->gcm.EKi.c[n];
+			--len;
+			n = (n + 1) % 16;
+		}
+		if (n == 0) {
+			gcm_gmult_neon(ctx->gcm.Xi.u, ctx->gcm.Htable);
+			mres = 0;
+		} else {
+			ctx->gcm.mres = n;
+			return 0;
+		}
+	}
+	if ((i = (len & (size_t)-16))) {
+		size_t j = i / 16;
+
+		memcpy(&bsks.ks, &ctx->aes_ks, sizeof(bsks.ks));
+		bsks.converted = 0;
+		bsaes_ctr32_encrypt_blocks(in, out, j, &bsks, ctx->gcm.Yi.c);
+		ctr += (unsigned int)j;
+#if BYTE_ORDER == LITTLE_ENDIAN
+		ctx->gcm.Yi.d[3] = bswap32(ctr);
+#else
+		ctx->gcm.Yi.d[3] = ctr;
+#endif
+		in += i;
+		len -= i;
+		while (j--) {
+			for (i = 0; i < 16; ++i)
+				ctx->gcm.Xi.c[i] ^= out[i];
+			gcm_gmult_neon(ctx->gcm.Xi.u, ctx->gcm.Htable);
+			out += 16;
+		}
+	}
+	if (len) {
+		AES_encrypt(ctx->gcm.Yi.c, ctx->gcm.EKi.c, &ctx->aes_ks);
+		++ctr;
+#if BYTE_ORDER == LITTLE_ENDIAN
+		ctx->gcm.Yi.d[3] = bswap32(ctr);
+#else
+		ctx->gcm.Yi.d[3] = ctr;
+#endif
+		while (len--) {
+			ctx->gcm.Xi.c[mres++] ^= out[n] = in[n] ^ ctx->gcm.EKi.c[n];
+			++n;
+		}
+	}
+
+	ctx->gcm.mres = mres;
+	return 0;
+}
+
+static int
+gcm_decrypt(struct ossl_gcm_context *ctx, const unsigned char *in,
+    unsigned char *out, size_t len)
+{
+	struct bsaes_key bsks;
+	unsigned int n, ctr, mres;
+	size_t i;
+	uint64_t mlen = ctx->gcm.len.u[1];
+
+	mlen += len;
+	if (mlen > ((1ull << 36) - 32) || (sizeof(len) == 8 && mlen < len))
+		return -1;
+	ctx->gcm.len.u[1] = mlen;
+
+	mres = ctx->gcm.mres;
+
+	if (ctx->gcm.ares) {
+		/* First call to decrypt finalizes GHASH(AAD) */
+		gcm_gmult_neon(ctx->gcm.Xi.u, ctx->gcm.Htable);
+		ctx->gcm.ares = 0;
+	}
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+	ctr = bswap32(ctx->gcm.Yi.d[3]);
+#else
+	ctr = ctx->gcm.Yi.d[3];
+#endif
+
+	n = mres % 16;
+	if (n) {
+		while (n && len) {
+			uint8_t c = *(in++);
+			*(out++) = c ^ ctx->gcm.EKi.c[n];
+			ctx->gcm.Xi.c[n] ^= c;
+			--len;
+			n = (n + 1) % 16;
+		}
+		if (n == 0) {
+			gcm_gmult_neon(ctx->gcm.Xi.u, ctx->gcm.Htable);
+			mres = 0;
+		} else {
+			ctx->gcm.mres = n;
+			return 0;
+		}
+	}
+	if ((i = (len & (size_t)-16))) {
+		size_t j = i / 16;
+
+		while (j--) {
+			size_t k;
+			for (k = 0; k < 16; ++k)
+				ctx->gcm.Xi.c[k] ^= in[k];
+			gcm_gmult_neon(ctx->gcm.Xi.u, ctx->gcm.Htable);
+			in += 16;
+		}
+		j = i / 16;
+		in -= i;
+		memcpy(&bsks.ks, &ctx->aes_ks, sizeof(bsks.ks));
+		bsks.converted = 0;
+		bsaes_ctr32_encrypt_blocks(in, out, j, &bsks, ctx->gcm.Yi.c);
+		ctr += (unsigned int)j;
+#if BYTE_ORDER == LITTLE_ENDIAN
+		ctx->gcm.Yi.d[3] = bswap32(ctr);
+#else
+		ctx->gcm.Yi.d[3] = ctr;
+#endif
+		out += i;
+		in += i;
+		len -= i;
+	}
+	if (len) {
+		AES_encrypt(ctx->gcm.Yi.c, ctx->gcm.EKi.c, &ctx->aes_ks);
+		++ctr;
+#if BYTE_ORDER == LITTLE_ENDIAN
+		ctx->gcm.Yi.d[3] = bswap32(ctr);
+#else
+		ctx->gcm.Yi.d[3] = ctr;
+#endif
+		while (len--) {
+			uint8_t c = in[n];
+			ctx->gcm.Xi.c[mres++] ^= c;
+			out[n] = c ^ ctx->gcm.EKi.c[n];
+			++n;
+		}
+	}
+
+	ctx->gcm.mres = mres;
+	return 0;
+}
+
+static void
+gcm_tag(struct ossl_gcm_context *ctx, unsigned char *tag, size_t len)
+{
+	gcm_finish(ctx, NULL, 0);
+	memcpy(tag, ctx->gcm.Xi.c, len);
+}
+
+static const struct ossl_aes_gcm_ops gcm_ops_neon = {
+	.init = gcm_init,
+	.setiv = gcm_setiv,
+	.aad = gcm_aad,
+	.encrypt = gcm_encrypt,
+	.decrypt = gcm_decrypt,
+	.finish = gcm_finish,
+	.tag = gcm_tag,
+};
+
+int ossl_aes_gcm_setkey(const unsigned char *key, int klen, void *_ctx);
+
+int
+ossl_aes_gcm_setkey(const unsigned char *key, int klen, void *_ctx)
+{
+	struct ossl_gcm_context *ctx;
+
+	ctx = _ctx;
+	ctx->ops = &gcm_ops_neon;
+	gcm_init(ctx, key, klen);
+	return (0);
+}
diff --git a/sys/crypto/openssl/ossl_arm.c b/sys/crypto/openssl/ossl_arm.c
--- a/sys/crypto/openssl/ossl_arm.c
+++ b/sys/crypto/openssl/ossl_arm.c
@@ -44,6 +44,8 @@
 ossl_cipher_setkey_t AES_set_encrypt_key;
 ossl_cipher_setkey_t AES_set_decrypt_key;
 
+ossl_cipher_setkey_t ossl_aes_gcm_setkey;
+
 unsigned int OPENSSL_armcap_P;
 
 void
@@ -55,5 +57,9 @@
 		sc->has_aes = true;
 		ossl_cipher_aes_cbc.set_encrypt_key = AES_set_encrypt_key;
 		ossl_cipher_aes_cbc.set_decrypt_key = AES_set_decrypt_key;
+
+		sc->has_aes_gcm = true;
+		ossl_cipher_aes_gcm.set_encrypt_key = ossl_aes_gcm_setkey;
+		ossl_cipher_aes_gcm.set_decrypt_key = ossl_aes_gcm_setkey;
 	}
 }
diff --git a/sys/modules/ossl/Makefile b/sys/modules/ossl/Makefile
--- a/sys/modules/ossl/Makefile
+++ b/sys/modules/ossl/Makefile
@@ -21,11 +21,13 @@
 	aes-armv4.S \
 	bsaes-armv7.S \
 	chacha-armv4.S \
+	ghash-armv4.S \
 	poly1305-armv4.S  \
 	sha1-armv4-large.S \
 	sha256-armv4.S \
 	sha512-armv4.S \
-	ossl_arm.c
+	ossl_arm.c \
+	ossl_aes_gcm.c
 
 SRCS.aarch64= \
 	chacha-armv8.S \