diff --git a/include/psa/crypto_values.h b/include/psa/crypto_values.h
index 4f75b1f66c..304182519f 100644
--- a/include/psa/crypto_values.h
+++ b/include/psa/crypto_values.h
@@ -713,6 +713,12 @@
      1u << PSA_GET_KEY_TYPE_BLOCK_SIZE_EXPONENT(type) :                         \
      0u)
 
+/** An invalid algorithm identifier value.
+ *
+ * Zero is not the encoding of any algorithm.
+ */
+#define PSA_ALG_NONE                            ((psa_algorithm_t)0)
+
 /** Vendor-defined algorithm flag.
  *
  * Algorithms defined by this standard will never have the #PSA_ALG_VENDOR_FLAG
diff --git a/programs/psa/psa_constant_names_generated.c b/programs/psa/psa_constant_names_generated.c
index 34919df769..63c79ee9cc 100644
--- a/programs/psa/psa_constant_names_generated.c
+++ b/programs/psa/psa_constant_names_generated.c
@@ -223,6 +223,7 @@ static int psa_snprint_algorithm(char *buffer, size_t buffer_size,
     case PSA_ALG_MD2: append(&buffer, buffer_size, &required_size, "PSA_ALG_MD2", 11); break;
     case PSA_ALG_MD4: append(&buffer, buffer_size, &required_size, "PSA_ALG_MD4", 11); break;
     case PSA_ALG_MD5: append(&buffer, buffer_size, &required_size, "PSA_ALG_MD5", 11); break;
+    case PSA_ALG_NONE: append(&buffer, buffer_size, &required_size, "PSA_ALG_NONE", 12); break;
     case PSA_ALG_OFB: append(&buffer, buffer_size, &required_size, "PSA_ALG_OFB", 11); break;
     case PSA_ALG_PBKDF2_AES_CMAC_PRF_128: append(&buffer, buffer_size, &required_size, "PSA_ALG_PBKDF2_AES_CMAC_PRF_128", 31); break;
     case PSA_ALG_PBKDF2_HMAC_BASE: append(&buffer, buffer_size, &required_size, "PSA_ALG_PBKDF2_HMAC_BASE", 24); break;