diff --git a/lib/event_log/event_log.c b/lib/event_log/event_log.c
new file mode 100644
index 0000000..761ff29
--- /dev/null
+++ b/lib/event_log/event_log.c
@@ -0,0 +1,302 @@
+/*
+ * Copyright (c) 2020-2025, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <errno.h>
+#include <string.h>
+
+#include "crypto_mod.h"
+#include "event_log.h"
+
+#if TPM_ALG_ID == TPM_ALG_SHA512
+#define	CRYPTO_MD_ID	CRYPTO_MD_SHA512
+#elif TPM_ALG_ID == TPM_ALG_SHA384
+#define	CRYPTO_MD_ID	CRYPTO_MD_SHA384
+#elif TPM_ALG_ID == TPM_ALG_SHA256
+#define	CRYPTO_MD_ID	CRYPTO_MD_SHA256
+#else
+#  error Invalid TPM algorithm.
+#endif /* TPM_ALG_ID */
+
+/* Running Event Log Pointer */
+static uint8_t *log_ptr;
+
+/* Pointer to the first byte past end of the Event Log buffer */
+static uintptr_t log_end;
+
+/* TCG_EfiSpecIdEvent */
+static const id_event_headers_t id_event_header = {
+	.header = {
+		.pcr_index = PCR_0,
+		.event_type = EV_NO_ACTION,
+		.digest = {0},
+		.event_size = (uint32_t)(sizeof(id_event_struct_t) +
+				(sizeof(id_event_algorithm_size_t) *
+				HASH_ALG_COUNT))
+	},
+
+	.struct_header = {
+		.signature = TCG_ID_EVENT_SIGNATURE_03,
+		.platform_class = PLATFORM_CLASS_CLIENT,
+		.spec_version_minor = TCG_SPEC_VERSION_MINOR_TPM2,
+		.spec_version_major = TCG_SPEC_VERSION_MAJOR_TPM2,
+		.spec_errata = TCG_SPEC_ERRATA_TPM2,
+		.uintn_size = (uint8_t)(sizeof(unsigned int) /
+					sizeof(uint32_t)),
+		.number_of_algorithms = HASH_ALG_COUNT
+	}
+};
+
+static const event2_header_t locality_event_header = {
+	/*
+	 * All EV_NO_ACTION events SHALL set
+	 * TCG_PCR_EVENT2.pcrIndex = 0, unless otherwise specified
+	 */
+	.pcr_index = PCR_0,
+
+	/*
+	 * All EV_NO_ACTION events SHALL set
+	 * TCG_PCR_EVENT2.eventType = 03h
+	 */
+	.event_type = EV_NO_ACTION,
+
+	/*
+	 * All EV_NO_ACTION events SHALL set TCG_PCR_EVENT2.digests to all
+	 * 0x00's for each allocated Hash algorithm
+	 */
+	.digests = {
+		.count = HASH_ALG_COUNT
+	}
+};
+
+int event_log_record(const uint8_t *hash, uint32_t event_type,
+		      const event_log_metadata_t *metadata_ptr)
+{
+	void *ptr = log_ptr;
+	uint32_t name_len = 0U;
+
+	/* event_log_buf_init() must have been called prior to this. */
+	if (hash == NULL || metadata_ptr == NULL || log_ptr == NULL) {
+		return -EINVAL;
+	}
+
+	if (metadata_ptr->name != NULL) {
+		name_len = (uint32_t)strlen(metadata_ptr->name) + 1U;
+	}
+
+	/* Check for space in Event Log buffer */
+	if (((uintptr_t)ptr + (uint32_t)EVENT2_HDR_SIZE + name_len) > log_end) {
+		return -ENOMEM;
+	}
+
+	/*
+	 * As per TCG specifications, firmware components that are measured
+	 * into PCR[0] must be logged in the event log using the event type
+	 * EV_POST_CODE.
+	 */
+	/* TCG_PCR_EVENT2.PCRIndex */
+	((event2_header_t *)ptr)->pcr_index = metadata_ptr->pcr;
+
+	/* TCG_PCR_EVENT2.EventType */
+	((event2_header_t *)ptr)->event_type = event_type;
+
+	/* TCG_PCR_EVENT2.Digests.Count */
+	ptr = (uint8_t *)ptr + offsetof(event2_header_t, digests);
+	((tpml_digest_values *)ptr)->count = HASH_ALG_COUNT;
+
+	/* TCG_PCR_EVENT2.Digests[] */
+	ptr = (uint8_t *)((uintptr_t)ptr +
+			offsetof(tpml_digest_values, digests));
+
+	/* TCG_PCR_EVENT2.Digests[].AlgorithmId */
+	((tpmt_ha *)ptr)->algorithm_id = TPM_ALG_ID;
+
+	/* TCG_PCR_EVENT2.Digests[].Digest[] */
+	ptr = (uint8_t *)((uintptr_t)ptr + offsetof(tpmt_ha, digest));
+
+	/* Copy digest */
+	(void)memcpy(ptr, (const void *)hash, TCG_DIGEST_SIZE);
+
+	/* TCG_PCR_EVENT2.EventSize */
+	ptr = (uint8_t *)((uintptr_t)ptr + TCG_DIGEST_SIZE);
+	((event2_data_t *)ptr)->event_size = name_len;
+
+	/* Copy event data to TCG_PCR_EVENT2.Event */
+	if (metadata_ptr->name != NULL) {
+		(void)memcpy((void *)(((event2_data_t *)ptr)->event),
+				(const void *)metadata_ptr->name, name_len);
+	}
+
+	/* End of event data */
+	log_ptr = (uint8_t *)((uintptr_t)ptr +
+			offsetof(event2_data_t, event) + name_len);
+
+	return 0;
+}
+
+int event_log_buf_init(uint8_t *event_log_start, uint8_t *event_log_finish)
+{
+	if (event_log_start == NULL || event_log_finish == NULL ||
+	    event_log_start > event_log_finish) {
+		return -EINVAL;
+	}
+
+	log_ptr = event_log_start;
+	log_end = (uintptr_t)event_log_finish;
+
+	return 0;
+}
+
+int event_log_init(uint8_t *event_log_start, uint8_t *event_log_finish)
+{
+	return event_log_buf_init(event_log_start, event_log_finish);
+}
+
+int event_log_write_specid_event(void)
+{
+	void *ptr;
+
+	/* event_log_buf_init() must have been called prior to this. */
+	if (log_ptr == NULL) {
+		return -EFAULT;
+	}
+
+	if (((uintptr_t)log_ptr + ID_EVENT_SIZE) > log_end) {
+		return -ENOMEM;
+	}
+
+	ptr = log_ptr;
+
+	/*
+	 * Add Specification ID Event first
+	 *
+	 * Copy TCG_EfiSpecIDEventStruct structure header
+	 */
+	(void)memcpy(ptr, (const void *)&id_event_header,
+			sizeof(id_event_header));
+	ptr = (uint8_t *)((uintptr_t)ptr + sizeof(id_event_header));
+
+	/* TCG_EfiSpecIdEventAlgorithmSize structure */
+	((id_event_algorithm_size_t *)ptr)->algorithm_id = TPM_ALG_ID;
+	((id_event_algorithm_size_t *)ptr)->digest_size = TCG_DIGEST_SIZE;
+	ptr = (uint8_t *)((uintptr_t)ptr + sizeof(id_event_algorithm_size_t));
+
+	/*
+	 * TCG_EfiSpecIDEventStruct.vendorInfoSize
+	 * No vendor data
+	 */
+	((id_event_struct_data_t *)ptr)->vendor_info_size = 0;
+	log_ptr = (uint8_t *)((uintptr_t)ptr +
+			offsetof(id_event_struct_data_t, vendor_info));
+
+	return 0;
+}
+
+int event_log_write_header(void)
+{
+	const char locality_signature[] = TCG_STARTUP_LOCALITY_SIGNATURE;
+	void *ptr;
+	int rc;
+
+	rc = event_log_write_specid_event();
+	if (rc < 0) {
+		return rc;
+	}
+
+	if (((uintptr_t)log_ptr + LOC_EVENT_SIZE) > log_end) {
+		return -ENOMEM;
+	}
+
+	ptr = log_ptr;
+
+	/*
+	 * The Startup Locality event should be placed in the log before
+	 * any event which extends PCR[0].
+	 *
+	 * Ref. TCG PC Client Platform Firmware Profile 9.4.5.3
+	 */
+
+	/* Copy Startup Locality Event Header */
+	(void)memcpy(ptr, (const void *)&locality_event_header,
+			sizeof(locality_event_header));
+	ptr = (uint8_t *)((uintptr_t)ptr + sizeof(locality_event_header));
+
+	/* TCG_PCR_EVENT2.Digests[].AlgorithmId */
+	((tpmt_ha *)ptr)->algorithm_id = TPM_ALG_ID;
+
+	/* TCG_PCR_EVENT2.Digests[].Digest[] */
+	(void)memset(&((tpmt_ha *)ptr)->digest, 0, TCG_DIGEST_SIZE);
+	ptr = (uint8_t *)((uintptr_t)ptr +
+			offsetof(tpmt_ha, digest) + TCG_DIGEST_SIZE);
+
+	/* TCG_PCR_EVENT2.EventSize */
+	((event2_data_t *)ptr)->event_size =
+		(uint32_t)sizeof(startup_locality_event_t);
+	ptr = (uint8_t *)((uintptr_t)ptr + offsetof(event2_data_t, event));
+
+	/* TCG_EfiStartupLocalityEvent.Signature */
+	(void)memcpy(ptr, (const void *)locality_signature,
+		sizeof(TCG_STARTUP_LOCALITY_SIGNATURE));
+
+	/*
+	 * TCG_EfiStartupLocalityEvent.StartupLocality = 0:
+	 * the platform's boot firmware
+	 */
+	((startup_locality_event_t *)ptr)->startup_locality = 0U;
+	log_ptr = (uint8_t *)((uintptr_t)ptr + sizeof(startup_locality_event_t));
+
+	return 0;
+}
+
+int event_log_measure(uintptr_t data_base, uint32_t data_size,
+		      unsigned char hash_data[CRYPTO_MD_MAX_SIZE])
+{
+	/* Calculate hash */
+	return crypto_mod_calc_hash(CRYPTO_MD_ID,
+				    (void *)data_base, data_size, hash_data);
+}
+
+int event_log_measure_and_record(uintptr_t data_base, uint32_t data_size,
+				 uint32_t data_id,
+				 const event_log_metadata_t *metadata_ptr)
+{
+	unsigned char hash_data[CRYPTO_MD_MAX_SIZE];
+	int rc;
+
+	if (metadata_ptr == NULL) {
+		return -EINVAL;
+	}
+
+	/* Get the metadata associated with this image. */
+	while (metadata_ptr->id != data_id) {
+		if (metadata_ptr->id == EVLOG_INVALID_ID) {
+			return -EINVAL;
+		}
+
+		metadata_ptr++;
+	}
+
+	/* Measure the payload with algorithm selected by EventLog driver */
+	rc = event_log_measure(data_base, data_size, hash_data);
+	if (rc != 0) {
+		return rc;
+	}
+
+	rc = event_log_record(hash_data, EV_POST_CODE, metadata_ptr);
+	if (rc != 0) {
+		return rc;
+	}
+
+	return 0;
+}
+
+size_t event_log_get_cur_size(uint8_t *event_log_start)
+{
+	assert(event_log_start != NULL);
+	assert(log_ptr >= event_log_start);
+
+	return (size_t)((uintptr_t)log_ptr - (uintptr_t)event_log_start);
+}