diff --git a/src/libsodium/crypto_hash/sha256/hash_sha256_api.c b/src/libsodium/crypto_hash/sha256/hash_sha256_api.c
index 5d2f4783..ca208fff 100644
--- a/src/libsodium/crypto_hash/sha256/hash_sha256_api.c
+++ b/src/libsodium/crypto_hash/sha256/hash_sha256_api.c
@@ -4,3 +4,8 @@ size_t
 crypto_hash_sha256_bytes(void) {
     return crypto_hash_sha256_BYTES;
 }
+
+size_t
+crypto_hash_sha256_statebytes(void) {
+    return sizeof(crypto_hash_sha256_state);
+}
diff --git a/src/libsodium/crypto_hash/sha512/hash_sha512_api.c b/src/libsodium/crypto_hash/sha512/hash_sha512_api.c
index 75971bc2..b2629a83 100644
--- a/src/libsodium/crypto_hash/sha512/hash_sha512_api.c
+++ b/src/libsodium/crypto_hash/sha512/hash_sha512_api.c
@@ -4,3 +4,8 @@ size_t
 crypto_hash_sha512_bytes(void) {
     return crypto_hash_sha512_BYTES;
 }
+
+size_t
+crypto_hash_sha512_statebytes(void) {
+    return sizeof(crypto_hash_sha512_state);
+}
diff --git a/src/libsodium/include/sodium/crypto_hash_sha256.h b/src/libsodium/include/sodium/crypto_hash_sha256.h
index 449ddf22..2bc33efe 100644
--- a/src/libsodium/include/sodium/crypto_hash_sha256.h
+++ b/src/libsodium/include/sodium/crypto_hash_sha256.h
@@ -26,6 +26,8 @@ typedef struct crypto_hash_sha256_state {
     uint32_t      count[2];
     unsigned char buf[64];
 } crypto_hash_sha256_state;
+SODIUM_EXPORT
+size_t crypto_hash_sha256_statebytes(void);
 
 #define crypto_hash_sha256_BYTES 32U
 SODIUM_EXPORT
diff --git a/src/libsodium/include/sodium/crypto_hash_sha512.h b/src/libsodium/include/sodium/crypto_hash_sha512.h
index e8ef2e36..12df0334 100644
--- a/src/libsodium/include/sodium/crypto_hash_sha512.h
+++ b/src/libsodium/include/sodium/crypto_hash_sha512.h
@@ -26,6 +26,8 @@ typedef struct crypto_hash_sha512_state {
     uint64_t      count[2];
     unsigned char buf[128];
 } crypto_hash_sha512_state;
+SODIUM_EXPORT
+size_t crypto_hash_sha512_statebytes(void);
 
 #define crypto_hash_sha512_BYTES 64U
 SODIUM_EXPORT
diff --git a/test/default/hash.c b/test/default/hash.c
index c220bd4f..00c07231 100644
--- a/test/default/hash.c
+++ b/test/default/hash.c
@@ -36,6 +36,8 @@ int main(void)
     assert(crypto_hash_sha256_bytes() > 0U);
     assert(crypto_hash_sha512_bytes() >= crypto_hash_sha256_bytes());
     assert(crypto_hash_sha512_bytes() == crypto_hash_bytes());
+    assert(crypto_hash_sha256_statebytes() == sizeof(crypto_hash_sha256_state));
+    assert(crypto_hash_sha512_statebytes() == sizeof(crypto_hash_sha512_state));
 
     return 0;
 }